Identification of Central Production in the π + π π + π Channel at COMPASS

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1 Identification of Central Production in the π + π π + π Channel at COMPASS ASI-Spin-Praha-009 Johannes Bernhard for the COMPASS collaboration Institut für Kernphysik Mainz July 8 th

2 Outline 1 Introduction Recoil Proton Detector Trigger 4 Analysis 5 Summary and Outlook

3 Introduction Diffractive Scattering: Central Production: Definition of Central Production Original definition, not only Double-Pomeron-Exchange formation of resonances at central rapidities CP of π π + π π + well suited for the search for scalar and tensor glueballs f 0 family of resonances most interesting to study

4 Introduction Central Production: Y. Chen et al., Phys. Rev. D 7, (006) Studies of Central Production with 4π final states F. Binon et al. GAMS Collaboration. Nuovo Cimento, 78, 198 S. Abatzis et al. WA91 Collaboration. Phys.Lett.B 4, 1994 F. Antinori et al. WA10 Collaboration, Phys.Lett.B 5, 1995 C. Amsler et al. Crystal Barrel Collaboration. Phys.Lett.B 80, 1996

5 The COMPASS spectrometer 190 GeV/c beam ( particles per 10s SPS spill) stage high resolution spectrometer with large acceptance MuonWall Target E/HCAL SM1 SM MuonWall 50 m E/HCAL Beam RICH [hep ex/070049, NIM A 577, 455 (007)] Dipole magnets Tracking detectors RICH El. mag. calorimeter Hadronic calorimeter Muon identification

6 Target Zone Liquid Hydrogen target system Sandwich Veto Upstream Veto TOF scintillators Silicon Microstrip Detectors Target cell Silicon Microstrip Detectors Acceptance +/ 180 mrad 1 m 40cm lh target luminosity 0.15pb 1 /day

7 Recoil Proton Detector Function: 1 fast trigger on recoil proton Proton PID via TOF and de/dx measurement

8 Introduction Recoil Proton Detector Trigger Analysis Summary and Outlook Recoil Proton Detector layout: cylindrical layers of scintillators (r1 = 10 mm and r = 775 mm surrounding the target) inner ring w/ 1 scintillator slabs (5 mm x 500 mm BC404, U Mainz) outer ring w/ 4 scintillator slabs (10 mm x 1080 mm, IHEP Protvino) RPD during its assembly small e and π background time resolution σ < 50 ps large dynamical range of the signals due to small attenuation length (λeff 70 cm)

9 Calibration I How to come to proton tracks? RPD measures times and hits with effective speed of light: times hit postions combine measurements of TOF and positions to calculate angles and β = v c no magnetic field around the target no direct p measurement combine with de/dx measurement to obtain p calibration of energy and TOF necessary

10 Calibration II Strategy of calibration: test measurements with cosmics, µ- and e beam to determine eff. speed of light and MIP pulse spectra (HV settings), also energy calibration online calibration with hadron/µ on recoil proton signal to set β in the correct range offline calibration with elastic and diffractive events for final tuning / MeV E B preliminary COMPASS π p π π + π p fast π+ π not acceptance corrected β recoil proton signal

11 Calibration III Finally correct for small effects, like energy loss in the target, finite beam spot size (RMS of 1 cm),... COMPASS π p π - - fast π+ π - π + π p Events not acceptance corrected Vertex Z / cm preliminary RPD Vertex Z / cm

12 Calibration III Finally correct for small effects, like energy loss in the target, finite beam spot size (RMS of 1 cm),... -t Spectrometer / (GeV/c) COMPASS π p π π + fast π+ π π p preliminary t RPD / (GeV/c) Momentum transfer t after momentum correction (offline)

13 Calibration III Finally correct for small effects, like energy loss in the target, finite beam spot size (RMS of 1 cm),... Events 1 10 COMPASS π p π - - fast π+ π - π + π p not acceptance corrected preliminary φ(spectrometer) - φ(rpd) - π

14 Proton Trigger no nd level trigger, so fast, efficient and pure trigger necessary trigger on slow recoil proton with RPD coincidence of one ring A element and one out of three possible ring B elements

15 Proton Trigger S A Hig h S A Low e π p roto n s identify proton by TOF and de/dx meas. (with thresholds to cut out e and π ± ) S B Low S B Hig h calculated energy losses in both rings for different incident angles and particles

16 DT0 Physics Trigger 1 Beam Definition: abt = SciFi01X Beamcounter Target Pointing: RPD = Recoil Proton Detector Veto System: Veto = SandwichVeto Hodoscope Vetos Beamkiller Physics Trigger DT0 = abt RPD!(Veto)

17 DT0 Physics Trigger - Empty/Full Target Effect Target full/empty ratio 14:1 DT0

18 Event Selection Compass 008 Run (shown here: 1% of 008 data) π p π fast (π+ π π + π )p recoil Cuts: Cut % -no Primary Vertex 67.9 DT0 Trigger Outgoing Charged Tracks.5 PV in Target.51 CEDAR Kaon Veto.46 Charge Conservation ΣQ = 1.5 Exclusivity (190 ± 5) GeV 0.7 Q fast = Central Production:

19 Vertex Distribution in Z (beam) direction Events.5 10 COMPASS fast π+ π (1% of 008 data) π p π π + π p preliminary Primary Vertex Z position (cm)

20 Vertex Distribution in XY-Plane Primary Vertex Y position (cm) COMPASS 008 π p πfast π+ π (1% of 008 data) preliminary - π + π p Primary Vertex X position (cm)

21 Exclusivity Events COMPASS fast π+ π (1% of 008 data) not acceptance corrected π p π π + π p preliminary Exclusivity (190 ± 5) GeV/c Momentum of 5π System (GeV/c)

22 Invariant Mass Distribution (5π) Events/10MeV/c COMPASS fast π+ π (1% of 008 data) not acceptance corrected π p π π + π p preliminary Invariant Mass of 5π System (GeV/c )

23 Invariant Mass of 4π System Events/10MeV/c f 1 (185) COMPASS fast π+ π (1% of 008 data) not acceptance corrected π p π π + π p 6 4 preliminary Invariant Mass of the 4π Subsystem (GeV/c )

24 Enhancement of CP events: xf One Approach to Select CP: Feynman x F x F = p l p l max = p l s, p l : longitudinal momentum s : total center-of-mass energy of the interaction p l max : the maximum allowed longitudinal momentum Events COMPASS π p π π + π p fast π+ π (1% of 008 data) not acceptance corrected Events 0 10 COMPASS π p π π + π p fast π+ π (1% of 008 data) not acceptance corrected preliminary preliminary 5 - x F(π ) > 0.7 fast x F of πfast x F(π ) > 0.7 fast x F of the 4π Subsystem

25 Invariant Mass of π System with π fast x Events/10MeV/c ρ(770) COMPASS fast π+ π (1% of 008 data) not acceptance corrected π p π π + π p preliminary 5 - x ) > 0.7 F (πfast Invariant Mass of the π + π Subsystem (GeV/c ) fast

26 Invariant Mass of 4π System Events/10MeV/c f 1 (185) COMPASS fast π+ π (1% of 008 data) not acceptance corrected π p π π + π p x ) > 0.7 F (πfast preliminary Invariant Mass of the 4π Subsystem (GeV/c )

27 Invariant Mass of 4π System Events/10MeV/c.5 10 f 1 (185) COMPASS π p π π + π p fast π+ π (1% of 008 data) not acceptance corrected x F(π ) > 0.7 fast preliminary Invariant Mass of the 4π Subsystem (GeV/c ) WA91 4π analysis

28 Different Approach: Cut on M(5π) Events/10MeV/c M(5π) > GeV/c M(5π) > 4 GeV/c M(5π) > 5 GeV/c COMPASS fast π+ π (1% of 008 data) not acceptance corrected π p π π + π p preliminary Invariant Mass of the 4π Subsystem (GeV/c )

29 Summary and Outlook COMPASS 008 Hadron Trigger and Recoil Proton Detector were presented alongside a first glance at potentially interesting centrally produced events both trigger and RPD show excellent performances ideas for central production cuts under investigation mass spectra compared to former experiments only few days of 008 data taking used in this analysis, 009 data also to be included Next steps: 1 include RPD and RICH information in the analysis acceptance correction study possibility of kinematic fitting with RPD 4 investigate further cuts for central production 5 perform Partial Wave Analysis

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