Present Status from the Experimental Study of Neutral Kaon Photoproduction around Threshold Region at Tohoku-LNS
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1 Present Status from the Experimental Study of Neutral Kaon Photoproduction around Threshold Region at Tohoku-LNS Masashi Kaneta for the NKS2 collaboration Department of Physics, Tohoku University
2 Introduction
3 Physics Motivation Investigation of strangeness production mechanism Threshold region of production No resonance decay Good for comparison with models Give theoreticians base data to address» coupling constant» resonance contribution Small cross-section, i.e. high statistics data is required Neutral channel in strangeness photoproduction Past experiments studied by K + production until 2002 Not enough data of differential cross-section of γ+n Κ 0 +Λ(Σ 0 )
4 The Experiment The experiment of neutral kaon spectrometer at LNS-Tohoku The first generation (NKS) Used TAGX spectrometer of INS and successfully done in 2004 C target results: nucl-ex/ submitted to PLB Liquid D 2 target results: will be submitted soon Some weak points were found No coverage on forward region No Stereo wire in Chambers The second generation of the experiment, NKS2 Constructed in from scratch Commissioning run Mar., Jun., and Sep 2006 by Carbon target The data taking with LD2 target First data: Nov/2-Nov/11 more data taken in Nov/28-Dec/11 will be taken in Jan/15-29, Feb/13-26 results from this data set will be shown today
5 The NKS2 Collaboration Department of Physics, Tohoku University N. Chiga, T. Fujibayashi, Y. Fujii, K. Futatsukawa, O. Hashimoto, K. Hirose, K. Hosomi, A. Iguchi, H. Kanda, M. Kaneta, T. Kawasaki, D. Kawama, Y. Ma, K. Maeda, N. Maruyama, A. Matsumura, M. Matsuzawa, M. Mimori, K. Miwa, Y. Miyagi, H. Miyase, S.N. Nakamura, K. Nonaka, Y. Okayasu, M. Sumihama, H. Tamura, N. Terada, K. Tsukada Laboratory of Nuclear Science, Tohoku University T. Ishikawa, T. Nakabayashi, H. Shimizu, K. Suzuki, T. Tamae, H. Yamazaki Department of Electrical and Electric Engineering, Akita University A. Sasaki Department of Electrical Engineering, Ichinoseki National College of Technology O. Konno
6 Tagged Photon Beam at LNS-Tohoku 200 MeV electron beam from LINAC 0 5m Neutral Kaon Spectrometer 2 Sweep magnet 1.2 GeV Stretcher-Booster Ring Photon tagging system
7 Tagged Photon Beam at LNS-Tohoku Tagger Backup Tagger Finger Photon beam Electron beam on carbon wire Tagged by electron which has energy loss E γ = GeV from 1.2GeV electron beam 6 MeV coverage per tagging counter Radiator
8 Inner Hodoscope The Spectrometer Straw Drift Chamber Dipole Magnet Outer Hodoscope γ beam Electron Veto Cylindrical Drift Chamber
9 Photo of NKS2
10 Recent Results from Nov/2-11 run ( events)
11 Particle Identify (PID) Opening angle cut -0.9 < cosφ < 0.8 is required to reduce e + e - Red : proton region Blue : pion region Note: There is a ghost between pion and proton due to shift of TOF, that is, the calibration is not perfect yet.
12 Decay Vertex Distribution Target Cell number of counts This distribution is projected on beam axis direction Vacuum Region Opening angle cut -0.9 < cosφ < 0.8 is required Decay vertex is reconstructed from trajectories of positive and charged particle pair γ Decay vertex point [cm] Target Cell
13 Invariant Mass (π( + π ) cut A Number of counts tagged photon events cut A: K 0 S candidate cut B: Λ candidate applying cut B to all entries Invariant mass of π + π [GeV/c 2 ] cut B Number of counts We can see Lambda peak no collection of Fermi motion Number of counts S/N increased after the cut Missing mass of γ n K 0 S [GeV/c 2 ] Invariant mass of π + π [GeV/c 2 ]
14 Invariant Mass (π( - p) Number of counts zoom in Invariant mass of π - p [GeV/c 2 ] Number of counts Invariant mass of π - p [GeV/c 2 ]
15 Summary
16 Summary The first data taking with liquid D 2 target in new spectrometer NKS2 all detectors become to be ready no problem in liquid deuteron target system ~100 K 0 S and ~300 Λ from run of Nov/2-11 We have and will have more data Nov/28-Dec/11 run have about 3 times data more than Nov/2-11 Two sets of the beam time in Jan and Feb. two weeks in each Total statistics will be ten times in this fiscal year Some progresses will be shown in the next JPS meeting What is the next? K 0 S and Λ coincidence measurement three tracks requirement on/off-line new vertex chamber to increase acceptance in vertical direction
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