Hiroyuki Sako Institute of Physics, University of Tsukuba Tennoudai, Tsukuba, Ibaraki, 305 Japan
|
|
- Veronica Kelley
- 5 years ago
- Views:
Transcription
1 1 HIPAGS '96 Detroit, MI August 22-24, 1996 BNL Antiproton Production in 11.7 AGeV/c Au+Au Collisions Hiroyuki Sako Institute of Physics, University of Tsukuba Tennoudai, Tsukuba, Ibaraki, 305 Japan for the E866 Collaboration: BNL-UCBerkeley-UCRiverside-Columbia-INS (Tokyo)-Kyoto-LLNL-Maryland-MITTokyo-Tsukuba-Yonsei pbejzz;-ij t,. ~ ABSTRACT BEG 2 93 rq44r id38 We present antiproton production in 11.7 AGeV/c Au+Au collisions measured in a wide transverse-mass coverage from the AGSE866 experiment. We show indications for strong absorption effects of antiprotons in Au+Au collisions through comparison with p+a and Si+A collisions, and centrality dependence in Au+Au collisions. 1. Introduction Antiproton production in elemental nucleon-nucleon collisions in the AGS energies (10 20 AGeV) is suppressed because of the nearby creation threshold energy (6.5 GeV). In heavy ion collisions, some fraction of initially produced antiprotons are absorbed by nucleons later. The visible antiproton yields are results of subtle interplay between the initial production and the absorption. An observation of antiproton enhancement should be an indication of the cooperative processes such as the quark-gluon-plasma (QGP) [1,2,3], or hadronic multistep processes [4,5]. On the other hand, an observation of strong suppression could be a signature of high baryon densities [3,6]. The previous experimental results in p+a and Si+A collisions show that antiproton yields are proportional to the number of projectile participants ( N p p o j ). There has been no clear signal observed for antiproton absorption. Two pictures have been proposed for antiproton production; one is the first collision model with very weak absorption [7] and the other is hadronic multi-step processes with absorption with free N X absorption cross sections [8]. In the heavier system of Au+Au, the maximum baryon density is predicted to reach about 10 times as high as the baryon density in the normal nucleus [6,9]. We investigate if we observe the absorption effect in such a high baryon density condition where a strong absorption effect is expected. 1 DW'RIBlfnON OF THlS DOCUMENT IS UFdb\PlilB _.
2 2. Experimental Setup The AGS-E866 experiment is aimed at studies of particle production in AGeV/c Au+Au collisions. The E866 spectrometer consists of two arms; the Henry Higgins spectrometer, which has been used in the E802 and E859 experiments, and the Forward Spectrometer, which was built newly for E866 for the forward angle coverages. In this analysis, we used the data taken in the Forward Spectrometer. The Forward Spectrometer has a 5 msr solid angle and covers polar angles from 6 to about 28 degrees in the laboratory frame. The Forward Spectrometer consists of two dipole magnets (FM1 and FM2), two tracking stations (FTl+TPCl+FT2 and FTS+TPC2+FT4), each of which consists of a TPC with two drift chambers on both sides, and a time-of-flight counter (FTOF). The kinematic coverage of antiprotons with the Forward Spectrometer is about 1 < y < 2 in rapidity (y), and mt < mo 1.2 [GeV/c2] in transverse mass (mt),where mo is the antiproton mass. The interaction trigger ( I N T ) is defined as an event with the char5e number of beam remnants lower than a threshold, which is determined by the zero-degree Cerenkov counter (Bull's Eye) located 9.5-m downstream the target. The zero-degree calorimeter (ZCAL) is positioned in the zero-degree direction 11-m downstream the target. It is used in the off-line analysis to define the centrality of collision events by measuring the total kinetic'energy of projectile spectators Data Analysis We have analyzed about 15 million Au+Au collision events taken in The Au beam energy in 1994 was 11.7 AGeV/c. Distributions of negative charged particles'which passed various track selection cuts are shown in Fig. 1. We have applied an asymmetric particleidentification (PID) cut for antiprotons in the mass-square vs momentum plane, in order to suppress background contamination of 7r- and ' K at momentum higher than 3 GeV/c. The PID cut is shown as solid lines in Fig. 1. The asymmetric cut extends the PID momentum limit up to 4.5 GeV/c. The number of final antiproton candidates is about 800. After the antiproton PID cut, we have obtained invariant differential cross sections in the rapidity vs transverse mass plane in minimum bias events ( I N T events), and with centrality cuts. For the centrality cuts, we used the energy spectrum of ZCAL, after the background subtraction using empty target runs. We defined the centrality as the trigger cross section between zero ZCAL energy and given ZCAL energy, normalized to the total I N T trigger cross section of 5.25 barn. We used four centrality windows; 0-10 %, %, %, and % (zero corresponds to the most central event), so that the number of antiproton candidates in each window is roughly same. 4. Results and Discussions We estimated the beam energy correction to compare antiproton yields at different beam energies, using antiproton production cross sections in p+p collisions. Fig. 2 shows antiproton production cross section in the p+p interaction as a function of f i Because few data points exist at the beam momentum lower than 15 GeV, we used the following
3 DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liabiiity or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, reammendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
4 DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document.
5 Figure 1: Negative charged particle distributions after the final track selection for 15 million minimum bias events in the mass-square vs momentum plane (left), and a projection onto mass-square at momentum lower than 3 GeV/c (right). The solid lines in the left figure show antiproton PID cuts. parametrization as proposed in Refs. [12,13]; c p p + ~ (= f ia)( f i - 4m)b [mb], where a = (1.064 f 0.039) x loe2, b = f are obtained from the fit to data. We defined the beam energy correction as the ratio of Eq. 1 at two different beam energies. Fig. 3 shows antiproton invariant differential cross sections in inclusive events. Since the I N T cross section is 5.25 barn while the total geometrical cross section in Au+Au collisions is 6.85 barn [15], we lose about 23 % of most peripheral events. The cross sections were obtained in minimum bias events ( I N T events), and corrected for antiproton yield in the most peripheral events by 8 %. Cross sections at kinematically reflected rapidities with respect to the nucleon-nucleon center-of-mass rapidity of 1.6 are consistent within statistical errors. Antiproton yields at pt II! 0 measured by two other experiments at AGS, E886 and E878 are also shown in the figure. To E878 data, we have applied the beam energy correction of 1.4 using Eq. 1. Agreements of these data with E866 data are good within errors. Fig. 4 shows antiproton invariant differential yields in four centrality windows. The inverse slope parameter increases as going to the central events from 0.17 GeV/c2 in central % events to 0.24 GeV/c2 in central 0-10 % events. Next, we have compared antiproton yields in p+a and Si+A collisions with those in Au+Au collisions with the beam energy correction. In order to describe different collision systems and centralities, we used the number of projectile participants (Nproj).We estimated Nproj using FRITIOF version 1.7, in a range of impact parameters converted from trigger cross sections at each centrality range. Fig. 5 shows antiproton's dn/dy multiplied by the energy correction for p+a, Si+A collisions at 14.6 AGeV/c, and Au+Au collisions at 11.7 AGeV/c as a function of Nproj. As mentioned above, antiproton yields in p+a and Si+A collisions are on a straight line (dashed line). On the other hand, the ratio of antiproton yields in Au+Au collisions to the line are only 60 % to 30 %, from the most peripheral events to the most central events, and the ratio decreases as going to the central events. This suggests strong antiproton absorption in Au+Au collisions, compared to in p+a and
6 4 Figure 2: Antiproton production cross section [mb] in the p+p interaction as a function of Js The data points are taken from Refs. [10,11]. The solid line shows the fit function of Eq m [GeV]. Si+A collisions, and also that the effect is stronger as going to the central events. Next, we have compared the centrality dependence in Au+Au collisions among various particle species. For the comparison, we used the ratios of the particle yields to n- yields, because the ratios may reduce systematic effects depending on the centrality. Fig. 6 shows ratios of rapidity densities, p/n', p/n-, K*/n- and &/ne, as a function of Nptoj. The order of increase of the ratios as going to the central events is K+/n- > K'/n' > p/n' > n+/n- > p/7r-. Only p/n- decreases as going to the central events, in contrast to other particle ratios. This is another signature suggesting that the antiproton absorption is stronger as going to the central events in Au+Au collisions. The above two experimental results suggest strong absorption effects in Au+Au collisions. Lastly, we have attempted comparison of antiproton yields with a cascade model, RQMD [18]. In RQMD, antiproton production is characterized by initial production in hadronic multi-step processes and absorption with the free N T annihilation cross sections [8]. RQMD predicts that about 98 % of initially produced antiprotons are absorbed in central Au+Au collisions. Fig. 7 shows comparison of antiproton's dn/dy with by the beam energy correction in p+a, Si+A, and Au+Au collisions. RQMD reproduces overall tendencies of antiproton yields from p+a to Au+Au collisions within 50 %. 5. Summary We have studied antiproton production in 11.7 AGeV/c Au+Au collisions using the Forward Spectrometer in the E866 experiment. Indications for strong absorption effects of antiprotons were observed in Au+Au collisions through comparison with p+a and Si+A collisions, and centrality dependence in Au+Au collisions. RQMD reproduces overall tendencies of antiproton yields from p+a to Au+Au collisions.
7 Mt Antiproton (Inclusive) l o ~ ", ' " " " " ' " ' l ' " ', ' ' ' ', ~ Mr 10-2 Antiproton (y= ) n ~ n l s w a109 ~ x o *M w-im x a s 10-4 Y 10-4 lo-; 10-8 Figure 3: Antiproton invariant differential crow rno for inclusections as a function of rn: sive events, compared with the results from E886 [14]in Au+Pt collisions at 11.7 AGeV/c, and E878 [15] in Au+Au collisions at 10.8 AGeV/c. The beam energy correction of 1.4is a p plied to the E878 data. The errors shown are statistical errors only. Systematic errors are about 10 % for E866 data, about % for E886 data, and about 20 % fo; E878 data mt-mo [c-civ/*] Figure 4: Antiproton invariant differential yields as a function of rnt - rno in four centrality windows, 0-10 %, %, %, and % in 1.2 < y < 2.0. The errors showa are statistical errors only. Systematic errors are about 10 %. Solid lines show exponential fits. Inverse slope parameters T are also shown. Acknowledgements This work is supported by the U.S. Department of Energy under contracts with BNL, Columbia University, LLNL, MIT, UC Riverside, by NASA under contract with University of California, by the Ministry of Education and KOSEF in Korea, and by the Ministry of Education, Science and Culture in Ja y. U.S. DeDt. o f Energy Contract No. ~~-AC02-76CH000162Brookhaven Na ional Laboratory. e 7. References 1. K. S. Lee e t al., Phys. Rev. C37 (1988) 1452; D. H.Rischke e t al., Phys. Rev. D41 (1990) 111; C. M. KO e t al., Phys. Rev. C38 (1988) 179; T. DeGrand, Phys. Rev. D30 (1984) U. Heinz e t al., 2. Phys. A318 (1984) 247; U. Heinz e t al., J. Phys. G12 (1986) S. Gavin e t al., Phys. Lett. B234 (1990) 175..
8 0.05 i FE. 0.W 0 t Figure 5: Antiproton's dn/dy multiplied by the energy correction,,for p+a, Si+A at 14.6 AGeV/c, and Au+Au collisions at 11.7 AGeV/c as a function of Nproj. The insert shows the enlarged plot for p+a data. Data are taken from Ref. [16] for p+a, from Ref. [17] for Si+A, and from this analysis for Au+Au. The rapidity ranges are 1.1 < y < 1.7 for p+a and Si+A collisions, and 1.0 < y < 1.6 for Au+Au, respectively, so that both ranges are ynn- 0.6 < y < ynn. The energy correction for Au+Au is 2.1. o p p GeVIc) ~( 4. A. Jahns e t al., 2. Phys. A341 (1992) A. Jahns e t al., Phys. Rev. Lett. 68 (1992) H. Sorge e t al., Phys. Lett. B243 (1990) S. H. Kahana e t al., Nucl. Phys. A566 (1994) 465c. 8. A. Jahns e t al., Phys. Lett. B308 (1993) Y. Pang e t al., Phys. Rev. Lett. 68 (1992) T. K. Gaisser e t al., Phys. Rev. D11 (1975) C. S. Shen e t al., Phys. Rev. 171 (1968) G. Q. Li e t al., Phys. Rev. C49 (1994) G. Batko e t al., Phys. Lett. B256 (1991) G. E. Diebold e t al. (E886 Collaboration), Phys. Rev. C48 (1993) D. Beavis e t al. (E878 Collaboration), Phys. Rev. Lett. 75 (1995) T. Abbott e t al. (E802 Collaboration), Phys. Rev. C47 (1993) R T. Abbott e t al. (E802 Collaboration), Phys. Lett. B271 (1991) H. Sorge e t al., Annals of Physics 192 (1989) 266; H.Sorge e t al., Nucl. Phys. A498 (1989) 567c.
9 Au+Au 11.7 AGeV/c (1.2 < y < 2.0) I l. 4 % N9rL-I w -0 Im NFJl N9rL-I am m -0 w rm am w Im uo NFJl m m N9rL-I Figure 6: Ratios of rapidity densities, pln-, FIT-,Kf/T' range of 1.2 to 2.0. Error bars are statistical only. and &IT-, as a function of NprOj in the rapidity Experimental data N H 1w wo Figure 7: Antiproton's d N / d y multiplied by the energy correction in p+a, Si+A, and Au+Au collisions for E802 and E866 data (left) and RQMD (right). The rapidity ranges are 1.1 < y < 1.7 for p+a and Si+A collisions, and 1.0 < y < 1.6 for Au+Au collisions, respectively. RQMD calculations from p+a and Si+A are taken from Ref. [8]. RQMD calculations for Au+Au collisions were done with RQMD Version 2.1, and the beam energy correction of 2.1 is applied, which is the same value as for the experimental data.
Centrality and Collision System Dependence of Antiproton ProductioryU W from p+a to Au+Au Collisions at AGS Energies
1 BNL- 6 53 7 5 Centrality and Collision System Dependence of Antiproton ProductioryU W Q. 4 [ from p+a to Au+Au Collisions at AGS Energies e - H. Sako, for the E802 Collaboration BNL-UCBerkeley-UCRiverside-Columbia-NS
More informationScaling between K+ and proton production in nucleus-nucleus collisions *
Proc. Quark Matter 95 Monterey, CA January 9-, 9 9 5 I BNL-6 55 Scaling between K+ and proton production in nucleus-nucleus collisions * Ziping Chen and Chellis Chasman Dept. of Physics, Brookhaven National
More informationTHE BRAHMS EXPERIMENT AT RHIC. Abstract
F,' A RHIC Summer S t u d y 1996: T h e o r y Workshop on RHI Collision, BNL, Upton, NY July 8-19, 1996. THE BRAHMS EXPERIMENT AT RHIC FLEMMING VIDEBBK Physics Department, Brookhaven National Laboratory,
More informationStrange Hadron Production from STAR Fixed-Target Program
Strange Hadron Production from STAR Fixed-Target Program (for the STAR Collaboration) Department of Engineering Physics, Tsinghua University, Beijing 84, China E-mail: musman_mughal@yahoo.com We report
More informationDiffractive Dijet Search with Roman Pots at CDF
w C O N F C j d o g / a l b Fermi National Accelerator Laboratory / Y 4 Q O S ' 3 3 Diffractive Dijet Search with Roman Pots at CDF P.L. Melbsit For the CDF Collaboration The Rockefeller University New
More informationSTRANGENESS PRODUCTION IN HEAVY ION COLLISIONS AT RELATIVISTIC ENERGIES *
Romanian Reports in Physics, Vol. 64, No. 3, P. 722 727, 2012 STRANGENESS PRODUCTION IN HEAVY ION COLLISIONS AT RELATIVISTIC ENERGIES * OANA RISTEA, A. JIPA, C. RISTEA, C. BEŞLIU, ŞTEFANIA VELICA University
More informationAuttWr(s): A. Blotz, Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
THE QUARK AND MESON STRUCTURE IN THE INSTANTON AuttWr(s): A. Blotz, Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA E. Shuryak, SUNY Stony Brook, Stony Brook, NY 11794,
More information(4) How do you develop an optimal signal detection technique from the knowledge of
Signal and Noise in Global Warming Detection Final Report Gerald R. North, Principal Investigator Climate System Research Program, Texas A&M University, Texas 1. Program Objectives The specific objectives
More informationNational Accelerator Laboratory
Fermi National Accelerator Laboratory FERMILAB-Conf-97/149-E DØ QCD Results Using the? Jet-Finding Algorithm in p p Collisions at p s = 1800 GeV D. Lincoln For the D Collaboration University of Michigan
More informationNational Accelerator Laboratory
Fermi National Accelerator Laboratory FERMILAB-Conf-99/292-E CDF and D0 New W Mass Results from CDF and D0 Bill Carithers Lawrence Berkeley Laboratory Berkeley, California Fermi National Accelerator Laboratory
More informationLawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory
Lawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory Title SEARCH FOR FLOW IN THE REACTION Ar + Pb Permalink https:escholarship.orgucitem85s8b502 Author Renfordt, R.E. Publication
More informationust/ aphysics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
The submitted manuscript has been created by the University of Chicago as Operator of Argonne N%tional Laboratory ( zargonne ) under ConIract No. W-31-109-ENG-38 with MJ4PR i@ -I OJ2 73 the U.S. Department
More informationStart-up Noise in 3-D Self-AmpMed
LBNL-388 13 UC-414 ERNEST ORLANDO LAWRENCE BERKELEY NATIONAL LABORATORY CONI=- 7 6 0 8 133--5r Start-up Noise in 3-D Self-AmpMed Spontaneous Emission IC-J. Kim Accelerator and Fusion Research Division
More informationCQNl_" RESPONSE TO 100% INTERNAL QUANTUM EFFICIENCY SILICON PHOTODIODES TO LOW ENERGY ELECTRONS AND IONS
I ' 4 46 Title: CQNl_"- 461123-1.2 RESPONSE TO 100% INTERNAL QUANTUM EFFICIENCY SILICON PHOTODIODES TO LOW ENERGY ELECTRONS AND IONS A uthor(s): H. 0. Funsten D. M. Suszcynsky R. Korde S. M. Ritzau Submitted
More informationLawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory
Lawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory Title High pt inclusive charged hadron spectra from Au+Au collisions at Sqrt(s_NN)=00 Gev Permalink https://escholarship.org/uc/item/3jp4v8vd
More informationSpace-time Evolution of A+A collision
Time Space-time Evolution of A+A collision Jets Fluctuations p p K K0* f g e m Hadronization (Freeze-out) + Expansion Mixed phase? QGP phase Thermalization Space (z) A Pre-equilibrium A Hadrons reflect
More informationAntibaryons in massive heavy ion reactions: Importance of potentials
Antibaryons in massive heavy ion reactions: Importance of potentials C. Spieles, M. Bleicher, A. Jahns, R. Mattiello, H. Sorge, H. Stöcker, W. Greiner Institut für Theoretische Physik, J. W. Goethe Universität,
More informationPROJECT PROGRESS REPORT (03/lfi?lfibr-~/15/1998):
F?ECEVVEI) N% 05 w PROJECT PROGRESS REPORT (03/lfi?lfibr-~/15/1998): A COMPREHENSIVE STUDY OF FRACTURE PATTERNS AND DENSITIES IN THE GEYSERS GEOTHERMAL RESERVOIR USING MICROEARTHQUAKE SHEAR-WAVE SPLITTING
More informationConference Report Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland
CMS CR - he Compact Muon Solenoid Experiment Conference Report Mailing address: CMS CERN, CH- GENEVA 3, Switzerland 8/5/6 Charmonium production measured in and pp collisions by CMS arxiv:7.5v [nucl-ex]
More informationThe photoneutron yield predictions by PICA and comparison with the measurements
The photoneutron yield predictions by PICA and comparison with the measurements P. K. Job Advanced Photon Source Argonne National Laboratory Argonne, IL 60349 T. G Gabriel OakRidge Detector Center OakRidge
More informationHyperon Particle Physics at JHF. R. E. Mischke
LA-UR- ma Title: Author(s): Submitted to: Hyperon Particle Physics at HF R. E. Mischke International Workshop on HF Science KEK, Tsukuba, apan March 3-7,1998 L OAlamos ~ National Laboratory, an affirmative
More informationNational Accelerator Laboratory
Fermi National Accelerator Laboratory FERMILAB-Conf-96/005-E CDF Kinematic Top Analyses at CDF M. Cobal-Grassman For the CDF Collaboration Fermi National Accelerator Laboratory P.O. Box 500, Batavia, Illinois
More informationStrangeness Production at SIS: Au+Au at 1.23A GeV with HADES & Microscopic Description by Transport Models
Strangeness Production at SIS: Au+Au at 1.23A GeV with HADES & Microscopic Description by Transport Models Timo Scheib Goethe Universität Frankfurt am Main // Outline HADES at SIS Strangeness Production
More informationExperimental Status of the AGS Relativistic Heavy Ion Pro
UCRL-JC-118789 PREPRNT Experimental Status of the AGS Relativistic Heavy on Pro T. Craig Sangster This paper was prepared for submittal t Proceedingsof the 27th nternational Conference on High Energy Physics
More informationOverview* of experimental results in heavy ion collisions
Overview* of experimental results in heavy ion collisions Dipartimento di Fisica Sperimentale dell Universita di Torino and INFN Torino * The selection criteria of the results presented here are (to some
More informationSoft physics results from the PHENIX experiment
Prog. Theor. Exp. Phys. 2015, 03A104 (15 pages) DOI: 10.1093/ptep/ptu069 PHYSICS at PHENIX, 15 years of discoveries Soft physics results from the PHENIX experiment ShinIchi Esumi, Institute of Physics,
More informationThe first Z boson measurement in the dimuon channel in PbPb collisions at s = 2.76 TeV at CMS
The first Z boson measurement in the dimuon channel in PbPb collisions at s = 2.76 TeV at CMS Lamia Benhabib On behalf of CMS collaboration We present the first measurement of Z bosons in the di-muon channel
More informationAzimuthal anisotropy of the identified charged hadrons in Au+Au collisions at S NN. = GeV at RHIC
Journal of Physics: Conference Series PAPER OPEN ACCESS Azimuthal anisotropy of the identified charged hadrons in Au+Au collisions at S NN = 39-200 GeV at RHIC To cite this article: S S Vdovkina 2017 J.
More informationNational Accelerator Laboratory
Fermi National Accelerator Laboratory FERMILAB-Conf-97/249-E CDF Physics of the Top Quark at CDF Steve Vejcik For the CDF Collaboration University of Michigan Fermi National Accelerator Laboratory P.O.
More informationColliding Crystalline Beams
BNL-65137 Colliding Crystalline Beams J. Wei BNL A.M. Sessler LBNL June 1998 RHIC Project Brookhaven National Laboratory Operated by Brookhaven Science Associates Upton NY 11973 Under Contract with the
More informationYUNGSu TSAI. Stanford Linear Accelerator Center Stanford University, Stanford, California ABSTRACT
SLAC-PUB-95-6916 June 1995 Test of T and CP Violation in Leptonic Decay of T** YUNGSu TSAI Stanford Linear Accelerator Center Stanford University, Stanford, California 94309 ABSTRACT The T*, highly polarized
More informationarxiv:nucl-ex/ v2 18 Jun 2003
Ξ and Ξ + production in Pb+Pb collisions at 4 A GeV at CERN SPS arxiv:nucl-ex/352v2 8 Jun 23. Introduction Christine Meurer for the NA49 Collaboration E-mail: Christine.Meurer@cern.ch Gesellschaft für
More informationSTI. ANL-HEP-CP June 10, 1997 ISOLATED PROMPT PHOTON PLUS JET PHOTOPRODUCTION AT HERA a
under contract No. W-31-104ENG-38. Accordingly, the U. S. Government retains a nonexclusive, royalty-free ticanre to publish M reproduce the published form of this contribution, or allow others to do 90.
More informationRecent Results of NA49
Recent Results of NA49 M. Gaździcki for the NA49 Collaboration Institut für Kernphysik, Univetsität Frankfurt D 6486 Frankfurt, Germany Abstract Results on the energy dependence of pion and strangeness
More informationarxiv:nucl-ex/ v1 10 May 2004
arxiv:nucl-ex/0405004v1 10 May 2004 Proc. 20th Winter Workshop on Nuclear Dynamics (2003) 000 000 Anisotropic flow at RHIC A. H. Tang 1 for the STAR Collaboration 1 NIKHEF and Brookhaven National Lab,
More informationSt anfo rd L in ear A ccele rat o r Cent e r
SLAC-PUB-7212 July 1996 NUCLEAR EFFECTS AT HERA STANLEY J. BRODSKY St anfo rd L in ear A ccele rat o r Cent e r St anfo rd University, St anfo rd, California 94 309 To appear in the Proceedings of the
More informationPlasma Response Control Using Advanced Feedback Techniques
Plasma Response Control Using Advanced Feedback Techniques by M. Clement 1 with J. M. Hanson 1, J. Bialek 1 and G. A. Navratil 1 1 Columbia University Presented at 59 th Annual APS Meeting Division of
More informationPoS(WPCF2011)012. New results on event-by-event fluctuations in A+A collisions at the CERN SPS. Grzegorz Stefanek for the NA49 Collaboration
New results on eventbyevent fluctuations in AA collisions at the CERN SPS for the NA9 Collaboration Jan Kochanowski University, Kielce, Poland Email: grzegorz.stefanek@pu.kielce.pl The study of central
More informationResults on heavy ion collisions at LHCb
Results on heavy ion collisions at LHCb Marcin Kucharczyk on behalf of LHCb collaboration HNI Krakow 28th Rencontres de Blois 29.05-03.06 2016 Outline LHCb - general purpose forward experiment Physics
More informationGA A23736 EFFECTS OF CROSS-SECTION SHAPE ON L MODE AND H MODE ENERGY TRANSPORT
GA A3736 EFFECTS OF CROSS-SECTION SHAPE ON L MODE AND H MODE ENERGY TRANSPORT by T.C. LUCE, C.C. PETTY, and J.E. KINSEY AUGUST DISCLAIMER This report was prepared as an account of work sponsored by an
More informationNational Accelerator Laboratory
Fermi National Accelerator Laboratory FERMILAB-Conf-99/278-T The Heavy Hybrid Spectrum from NRQCD and the Born-Oppenheimer Approximation K.J. Juge, J. Kuti and C.J. Morningstar Fermi National Accelerator
More informationFROM LITTLE BANGS TO BIG BANG
FROM LITTLE BANGS TO BIG BANG C. RISTEA 1, A. JIPA 1, I. LAZANU 1, OANA RISTEA 1, C. BESLIU 1, VALERICA BABAN 1, T. ESANU 1, V. COVLEA 1 1 University of Bucharest, Faculty of Physics E-mail: cat.ristea@gmail.com
More informationMomentum Correlations in Nuclear Collisions
Momentum Correlations in Nuclear Collisions By: Patrick Carzon Advisors: Sean Gavin, George Moschelli August 2016 1 Introduction Covariance is a measure of how linearly two things change with each other.
More informationAC dipole based optics measurement and correction at RHIC
BNL-1132-213-CP AC dipole based optics measurement and correction at RHIC X. Shen, S. Y. Lee Indiana University of Bloomington, IN 4745, USA M. Bai, S. White, G. Robert-Demolaize, Y. Luo, A. Marusic BNL,
More informationGA A26686 FAST ION EFFECTS DURING TEST BLANKET MODULE SIMULATION EXPERIMENTS IN DIII-D
GA A26686 FAST ION EFFECTS DURING TEST BLANKET MODULE SIMULATION EXPERIMENTS IN DIII-D by G.J. KRAMER, B.V. BUDNY, R. ELLIS, W.W. HEIDBRINK, T. KURKI-SUONIO, R. NAZIKIAN, A. SALMI, M.J. SCHAFFER, K. SHINOHARA,
More informationModeling Laser and e-beam Generated Plasma-Plume Experiments Using LASNEX
UCRL-ID-136726 Modeling Laser and e-beam Generated Plasma-Plume Experiments Using LASNEX D.D.-M. Ho December 1,1999 US. Department of Energy Approved for public release; further dissemination unlimited
More informationDevelopment of a High Intensity EBIT for Basic and Applied Science
UCRL-ID- 129832 Development of a High Intensity EBIT for Basic and Applied Science R.E. Marrs D. Schneider February 5,1998 This is an informal report intended primarily for internal or limited external
More informationPoS(Confinement8)110. Latest Results on High-p t Data and Baryon Production from NA49
Latest Results on High-p t Data and Baryon Production from NA49 for the NA49 Collaboration Institut für Kernphysik, J.W. Goethe Universität, Frankfurt am Main, Germany E-mail: blume@ikf.uni-frankfurt.de
More informationarxiv:nucl-ex/ v1 21 Dec 2004
φ meson production in d + Au collisions at s NN = 00 GeV arxiv:nucl-ex/041048v1 1 Dec 004 1. Introduction Dipali Pal for the PHENIX collaboration Department of Physics & Astronomy, Vanderbilt University,
More informationFission-Fusion Neutron Source
LLNL-CONF-415765 Fission-Fusion Neutron Source G. F. Chapline, R. Clarke August 18, 2009 DOE Fusion-Fission Workshop Gaithersburg, MD, United States September 30, 2009 through October 2, 2009 Disclaimer
More informationarxiv:nucl-th/ v1 23 May 1999
DEUTERON PRODUCTION AND SPACE-MOMENTUM CORRELATIONS AT RHIC S.Y. PANITKIN Department of Physics, Kent State University, OH 44242, USA arxiv:nucl-th/990505v 23 May 999 B. MONREAL, N. XU Nuclear Science
More informationRESEARCH IN ACCELERATOR PHYSICS (THEORY)
DOE/ER/40853-5 RESEARCH IN ACCELERATOR PHYSICS (THEORY) Final Technical Report May 15, 1995 - August 14, 1996 Shoroku Ohnuma Principal Investigator The University of Houston Houston, Texas 77204-5506 October
More informationLawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory
Lawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory Title Electron-Cloud Build-up in the FNAL Main Injector Permalink https://escholarship.org/uc/item/4v35z0wd Author Furman, M.A.
More information9 7og$y4- International Conference On Neutron Scattering, Toronto August Spin Dynamics of the reentrant spin glass Fe0.7A10.3.
i.b? BNL- 6 460 8 CO-Nf- nternational Conference On Neutron Scattering, Toronto 17-21 August 1997. 9 7og$y4- Spin Dynamics of the reentrant spin glass Fe0.7A10.3. S. Raymond a, W. Bao a, S.M. Shapiro a,
More informationRWM FEEDBACK STABILIZATION IN DIII D: EXPERIMENT-THEORY COMPARISONS AND IMPLICATIONS FOR ITER
GA A24759 RWM FEEDBACK STABILIZATION IN DIII D: EXPERIMENT-THEORY COMPARISONS AND IMPLICATIONS FOR ITER by A.M. GAROFALO, J. BIALEK, M.S. CHANCE, M.S. CHU, D.H. EDGELL, G.L. JACKSON, T.H. JENSEN, R.J.
More informationExcitations of the transversely polarized spin density. waves in chromium. E3-r 1s
c Version: July 15, 1997 Excitations of the transversely polarized spin density waves in chromium W.-T. Lee a, S. A. Werner a, J. A. Fernandez-Baca b, and R. S. Fishman. a Department of Physics, University
More informationGA A26057 DEMONSTRATION OF ITER OPERATIONAL SCENARIOS ON DIII-D
GA A26057 DEMONSTRATION OF ITER OPERATIONAL SCENARIOS ON DIII-D by E.J. DOYLE, J.C. DeBOO, T.A. CASPER, J.R. FERRON, R.J. GROEBNER, C.T. HOLCOMB, A.W. HYATT, G.L. JACKSON, R.J. LA HAYE, T.C. LUCE, G.R.
More informationSmall Collision Systems at RHIC
EPJ Web of Conferences 7, (8) SQM 7 https://doi.org/.5/epjconf/87 Small Collision Systems at RHIC Norbert Novitzky, Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 79, USA
More informationUNDERSTANDING TRANSPORT THROUGH DIMENSIONLESS PARAMETER SCALING EXPERIMENTS
UNDERSTANDING TRANSPORT THROUGH DIMENSIONLESS PARAMETER SCALING EXPERIMENTS by C.C. PETTY and T.C. LUCE JULY 1997 CENERaL ATOMRCS This report was prepared as an account of work sponsored by an agency of
More informationOptimization of NSLS-II Blade X-ray Beam Position Monitors: from Photoemission type to Diamond Detector. P. Ilinski
BNL-94868-2013-CP Optimization of NSLS-II Blade X-ray Beam Position Monitors: from Photoemission type to Diamond Detector P. Ilinski Submitted to Journal of Physics: Conference Series March 2013 Photon
More informationALICE A Large Ion Collider Experiment
ALICE A Large Ion Collider Experiment Purpose: study the physics of strongly interacting matter at extreme energy densities CERN LHC: Colliding Pb ions at E CM =5.5 A TeV, p-p, light ions collisions 84
More informationMulticusp Sources for Ion Beam Lithography Applications
LBL-3 6645 UC-406 Multicusp Sources for Ion Beam Lithography Applications K.N. Leung, P. H e n, W.B. Kunkel, Y. Lee, L. Perkins, D. Pickard, M. Sarstedt, M. Weber, and M.D. Williams Accelerator and Fusion
More informationBeijing. Charmed hadron signals of partonic medium. Olena Linnyk
Beijing Charmed hadron signals of partonic medium Olena Linnyk Our goal properties of partonic matter Hadron-string models Experiment QGP models Observables Hadron abundances J/Ψ anomalous suppression
More informationAnalysis of Shane Telescope Aberration and After Collimation
UCRL-ID- 133548 Analysis of Shane Telescope Aberration and After Collimation Before Don Gavel January 26,1999 This is an informal report intended primarily for internal or limited external distribution.
More informationGA A24166 SUPER-INTENSE QUASI-NEUTRAL PROTON BEAMS INTERACTING WITH PLASMA: A NUMERICAL INVESTIGATION
GA A24166 SUPER-INTENSE QUASI-NEUTRAL PROTON BEAMS INTERACTING WITH PLASMA: A NUMERICAL INVESTIGATION by H. RUHL, T.E. COWAN, and R.B. STEPHENS OCTOBER 2 DISCLAIMER This report was prepared as an account
More informationHigh-p T Neutral Pion Production in Heavy Ion Collisions at SPS and RHIC
High- Neutral Pion Production in Heavy Ion Collisions at SPS and RHIC K. Reygers for the WA98 and the PHENIX collaboration Institut für Kernphysik der Universität Münster Wilhelm-Klemm-Str. 9, D-4849 Münster,
More informationReiner Klingenberg Lab. for High Energy Physics, University of Bern Sidlerstrasse 5, CH-3012 Bern, Switzerland
STRANGELET SEARCH AND PARTCLE PRODUCTON STUDES N Pb + Pb C OLLSONS Reiner Klingenberg Lab. for High Energy Physics, University of Bern Sidlerstrasse 5, CH-3012 Bern, Switzerland for the NEWMASS (NA52)
More informationN. Tsoupas, E. Rodger, J. Claus, H.W. Foelsche, and P. Wanderer Brookhaven National Laboratory Associated Universities, Inc. Upton, New York 11973
,+ v Submitted t o : " 1995 Particle Accelerator Conference & International Conference on High-Energy Accelerators (May 1-5, 1995), Dallas, TX BNL-61195 DESIGN AND B-FIELD MEASUREMENTS OF A LAMBERTSON
More informationThe Core Corona Model
The Core Corona Model or Is the Centrality Dependence of Observables more than a Core-Corona Effect? inspired by the first multiplicity results in CuCu then used to extract the physics of EPOS simulations
More informationarxiv:nucl-th/ v1 9 May 1996
Phys. Rev. C (Aug., 1996) in press. p t dependence of transverse flow in relativistic heavy-ion collisions Bao-An Li, C.M. Ko and G.Q. Li Cyclotron Institute and Physics Department, arxiv:nucl-th/9605014v1
More informationTwo-Screen Method for Determining Electron Beam Energy and Deflection from Laser Wakefield Acceleration
LLNL-PROC-41269 Two-Screen Method for Determining Electron Beam Energy and Deflection from Laser Wakefield Acceleration B. B. Pollock, J. S. Ross, G. R. Tynan, L. Divol, S. H. Glenzer, V. Leurent, J. P.
More information'Tel Aviv University, 2Brookhaven National Laboratory, * Representing the E850 collaboration: H. Aclander',
w. Presented at Hadron 97,Brookhaven National Laboratory, Upton, New York August 25,997 Measurement of Color Transparency by C(p,2p) Reactions at Large Momentum Transfer A. S. Carroll* A GS Department?
More informationGA A23713 RECENT ECCD EXPERIMENTAL STUDIES ON DIII D
GA A271 RECENT ECCD EXPERIMENTAL STUDIES ON DIII D by C.C. PETTY, J.S. degrassie, R.W. HARVEY, Y.R. LIN-LIU, J.M. LOHR, T.C. LUCE, M.A. MAKOWSKI, Y.A. OMELCHENKO, and R. PRATER AUGUST 2001 DISCLAIMER This
More informationp t dependence of transverse flow in relativistic heavy-ion collisions
Phys. Rev. C (Aug., 1996) in press. p t dependence of transverse flow in relativistic heavy-ion collisions Bao-An Li, C.M. Ko and G.Q. Li Cyclotron Institute and Physics Department, Texas A&M University,
More informationSi. Petersburg, FL 33711, U.S.A. bhigh Energy Physics Division, Argonne National Laboratory, Argonne, IL 60439, U.S. A. ABSTRACT
by a contractor of the U. S. Government under contrat No. W-31-104ENG-38. Accordingly, the U. S. Government retains a nonexclusive, royalty-free license to publish or reproduce the pubhshed form of this
More informationTell uric prof i 1 es across the Darrough Known Geothermal Resource Area, Nevada. Harold Kaufniann. Open-file Report No.
Tell uric prof i 1 es across the Darrough Known Geothermal Resource Area, Nevada c i 4 L BY D Harold Kaufniann U.S. Geological Survey. r,. Open-file Report No. 76-286 1976 \, *\. i \ -- i 1'.- - L -.,,-.,
More informationSimulation of Double-Null Divertor Plasmas with the UEDGE Code
Preprint UCRL-JC-134341 Simulation of Double-Null Divertor Plasmas with the UEDGE Code M. E. Rensink, S. L. Allen, G. 0. Porter, T. 0. Rognlien This article was submitted to 7th International Workshop
More informationINITIAL RESULTS OF THE COMMISSIONING OF THE HRIBF RECOIL MASS SPECTROMETER
INITIAL RESULTS OF THE COMMISSIONING OF THE HRIBF RECOIL MASS SPECTROMETER C. J. Gross Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 and Oak Ridge Institute for Science and Education,
More informationGA A THERMAL ION ORBIT LOSS AND RADIAL ELECTRIC FIELD IN DIII-D by J.S. degrassie, J.A. BOEDO, B.A. GRIERSON, and R.J.
GA A27822 THERMAL ION ORBIT LOSS AND RADIAL ELECTRIC FIELD IN DIII-D by J.S. degrassie, J.A. BOEDO, B.A. GRIERSON, and R.J. GROEBNER JUNE 2014 DISCLAIMER This report was prepared as an account of work
More informationGA A27235 EULERIAN SIMULATIONS OF NEOCLASSICAL FLOWS AND TRANSPORT IN THE TOKAMAK PLASMA EDGE AND OUTER CORE
GA A27235 EULERIAN SIMULATIONS OF NEOCLASSICAL FLOWS AND TRANSPORT IN THE TOKAMAK PLASMA EDGE AND OUTER CORE by E.A. BELLI, J.A. BOEDO, J. CANDY, R.H. COHEN, P. COLELLA, M.A. DORF, M.R. DORR, J.A. HITTINGER,
More informationMapping the Nuclear Matter Phase Diagram with STAR: Au+Al at 2.8 AGeV and Au+Au at 19.6 GeV
Mapping the Nuclear Matter Phase Diagram with STAR: Au+Al at 2.8 AGeV and Au+Au at 19.6 GeV Samantha G Brovko June 14, 2011 1 INTRODUCTION In ultra-relativistic heavy ion collisions a partonic state of
More informationPoS(CPOD2017)028. Prospect of Heavy-ion Collision Experiments at J- PARC. Hiroyuki Sako 1
Prospect of Heavy-ion Collision Experiments at J- PARC 1 Japan Atomic Energy Agency Tokai, Naka, Ibaraki, Japan E-mail: hiroyuki.sako@j-parc.jp University of Tsukuba Tsukuba, Ibaraki, Japan In order to
More informationDML and Foil Measurements of ETA Beam Radius
UCRL-TR-213325 DML and Foil Measurements of ETA Beam Radius W.E. Nexsen, John Weir June 29, 25 Disclaimer This document was prepared as an account of work sponsored by an agency of the United States Government.
More informationPion, Kaon, and (Anti-) Proton Production in Au+Au Collisions at s = 62.4 GeV
Pion, Kaon, and (Anti-) Proton Production in AuAu Collisions at s = 6.4 GeV NN Ming Shao 1, for the STAR Collaboration 1 University of Science & Technology of China, Anhui 3007, China Brookhaven National
More informationEvent geometrical anisotropy and fluctuation viewed by HBT interferometry
Event geometrical anisotropy and fluctuation viewed by HB interferometry akafumi Niida University of sukuba -- ennoudai, sukuba, Ibaraki 35-857, Japan Abstract Azimuthal angle dependence of the pion source
More informationBROOKHAVEN NATIONAL LABORATORY. Fermion Masses and Anomalous Dipole Moments* William J. Marciano
BROOKHAVEN NATIONAL LABORATORY August 1995 BNL-62122 RECEIVED MAR 1 9 1996 OSTI Fermion Masses and Anomalous Dipole Moments* William J. Marciano Physics Depaxt ment Brookhaven National Laboratory Upton,
More informationCorrelations and fluctuations in p+p and Be+Be at the SPS energies from NA61/SHINE
Correlations and fluctuations in p+p and Be+Be at the SPS energies from NA61/SHINE Andrey Seryakov 1,a, for the NA61/SHINE Collaboration 1 Saint Petersburg State University, ul. Ulyanovskaya 1, 198504,
More informationLHCb results in proton-nucleus collisions at the LHC
LHCb results in proton-nucleus collisions at the LHC PANIC August 28, 2014 on behalf of the LHCb collaboration Outline Motivation LHCb Detector Beam configurations Measurements J/Ψ production Υ production
More informationThe experiment at JINR: status and physics program
The 3rd International Conference on Particle Physics and Astrophysics Volume 2018 Conference Paper The BM@N experiment at JINR: status and physics program D. Baranov, M. Kapishin, T. Mamontova, G. Pokatashkin,
More informationProduction of mesons in Au+Au collisions at 11.7A GeVc
Production of mesons in Au+Au collisions at 11.7A GeVc The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Citation As Published Publisher
More informationAbstract. results that address this question for the main linacs of the NLC. We will show that the effects of alignment drifts can indeed be handled.
SLAC-PUB-732 September 1996 Emittance Dilution Due to Slow Alignment Drifts in the Main Linacs of the NLC* R. Assmann, C. Adolphsen, K. Bane, T.O. Raubenheimer, K. Thompson Stanford Linear Accelerator
More informationThree-Dimensional Silicon Photonic Crystals
Three-Dimensional Silicon Photonic Crystals Shawn-Yu Lin'*, J. G. Fleming', D.L. Hetherington', B.K. Smith', W. Zubrzycki', R. Biswas2, M.M. Sigalas2, and K.M. Ho2. 'Sandia National Laboratories, P.O.
More informationExploring dense matter at FAIR: The CBM Experiment
Exploring dense matter at FAIR: The CBM Experiment What s it all about Landmarks of the QCD phase diagram: deconfinement phase transition chiral phase transition critical point 2 Signatures of phase transition
More informationPlutonium 239 Equivalency Calculations
LLNL-TR-490356 Plutonium 239 Equivalency Calculations J. Wen July 7, 2011 Disclaimer This document was prepared as an account of work sponsored by an agency of the United States government. Neither the
More informationMeasurement of light mesons at RHIC by the PHENIX experiment
Eur. Phys. J. C (2009) 61: 835 840 DOI 10.1140/epjc/s10052-009-0879-4 Regular Article - Experimental Physics Measurement of light mesons at RHIC by the PHENIX experiment M. Naglis a for the PHENIX Collaboration
More informationQuarkonium production measurement in Pb-Pb collisions at forward and mid rapidity with the ALICE experiment
Quarkonium production measurement in Pb-Pb collisions at forward and mid rapidity with the ALICE experiment Lizardo Valencia Palomo Institut de Physique Nucléaire d Orsay (CNRS-IN2P3, Université Paris-Sud
More informationOutline: Introduction and Motivation
Heavy ion collisions at lower energies: challenges and opportunities Beam Energy Scan (BES I and II) from RHIC Lijuan Ruan (Brookhaven National Laboratory) Outline: Introduction and Motivation Results
More informationFermi National Accelerator Laboratory. Inclusive Jet Production at CDF. Anwar Ahmad Bhatti. For the CDF Collaboration
w @on/7-9go8!j - -J/ Fermi National Accelerator Laboratory FNAqc-- 9V3Y3-G FERMILAB-Conf-96/33-E CDF Inclusive Jet Production at CDF Anwar Ahmad Bhatti For the CDF Collaboration Department of Physics,
More informationFinal Technical Report. Department of Energy. for
Final Technical Report to Department of Energy for Project: The Screening of the Lamb Ship in Heavy Helium-like Ions Grant No.: DE-FG04-95SF20579 submitted by Derrick J. Hylton Associate Professor of Physics
More informationAngular correlations of identified particles in the STAR BES data
Angular correlations of identified particles in the STAR BES data, for the STAR Collaboration Warsaw University of Technology E-mail: andrew.lipiec@gmail.com The angular correlation function (CF) in this
More information