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RICH detector in Transversity 6 GeV

C 6 F 14 Proximity RICH detector. RICH detector in Transversity 6 GeV. Aerogel Cherenkov Counter p rejection > 98% Time of Flight K/ p separation at 4 s RICH proximity focusing detector K/ p separation at 3.8 s. Preliminary. P h = 2.33 – 2.47 GeV/c. Strongest quality cuts.

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RICH detector in Transversity 6 GeV

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  1. C6F14 Proximity RICH detector RICH detector in Transversity 6 GeV • Aerogel Cherenkov Counter • p rejection > 98% • Time of Flight • K/p separation at 4s • RICH proximity focusing detector • K/p separation at 3.8s Preliminary Ph = 2.33 – 2.47 GeV/c Strongest quality cuts data from APS2010 / Y. Wang

  2. 6 GeV Transversity - Results Systematics of the same order of statistics Phys. Rev. Lett. 107 (2011) 072003 • Few months of data taking: statistics comparable to existing data. • Experimental limits: • statistics still modest, data integrated on 2 of the relevant kinematical variables (x,z,pT), • no access to large x, valence region, • no clean interpretation of the data Huang et al. PRL108, 052001 (2012)

  3. Electromagnetic Nucleon Form Factors @12GeV E-12-07-109: Polarization transfer E-12-09-016: Double polarization Extended measurements at high Q2 • Test different models (including different contributions from the quark OAM) • Investigate the transition region (perturbative / non perturbative) • Constraint the H and E GPDs Main Physics Program of the new Super Bigbite Spectrometer E-12-09-019: Cross section ratio

  4. SuperBigbite Spectrometer in Hall A High photon up to 250 MHz/cm2 and electron 160 kHz/cm2 background E. Cisbani et al. – GEM Tracker @ JLab Hall A Use VME64x • Electronics for: • Small silicon detector (SiD) • Front GEM tracker • Large backward GEM trackers •  >100k channels SiD • Large luminosity • Moderate acceptance • Forward angles • Reconfigurable detectors

  5. Front Tracker for the Super BigBite Spectrometer • Hit spatial resolution ~70 mm • Stand large background flux:~250 MHz/cm2g and ~160k charged particles) • Active area 120x40 cm2 • Event acquistion rate ~20 kevt/s • Minimize R&D (follow COMPASS main design) • Reconfigurability (to some extend) • Reuse solutions for SBS rear tracker • Use GEM Technology (3xGEM/Single Mask) + SiD microstrips • 6 GEM chambers (see left) made of 3 smaller modules2 Silicon Microstrip planes (before the dipole magnet) • Amoung the largest GEM chambers in a real experiment(out of LHC upgrade) 1650 mm 780 mm

  6. Front Tracker GEM Implementation Stretching Gluing the next frame with spacers Electronics based on APV25 chip Radiation Tolerant Components in FEC VME64x compliant readout Modular First full size GEM module + electronics under beam test in Magnetic Field

  7. HERMES RICH SIDIS: Experimental Setup e+3He→e’+p(K)+X Measure the SSA of SIDIS processes n(e,e’p)X and n(e,e’K)X BB: e-arm at 30o  = 45 msr GEM Tracker Gas Cherenkov Shower  A1n SBS: h-arm at 14o  = 50 msr GEM tracker excellent PID / RICH Hadron CALO Most of the equipments from EM Form-Factors experiments Beam: 50 A, E=8.8 and 11 GeV (80% long. Pol.) Target: 65% transv. polarized 3He, 8 spin directions  Luminosity: 4×1036cm-2s-1 PAC Approved Experiment Will reuse the HERMES RICH (now stored at Uva) which fits pretty well in SBS acceptance

  8. 12 GeV SIDIS with SBS and HERMES RICH • Support high luminosity • Access forward region • Provide large momuntum and moderately large angular acceptances (similar to HERMES) • Simple geometry • Large dipole magnet (~2 Tm) • Tracking based on GEM • HERMES RICH detector for h-ID • HCalo as trigger and e-h ID • Detectors shared by 3 form factors experiments (at least) • Goals: • Extract Sivers, Collins and Pretzelosity asymmetries on  and K with high statistics • Provide 3D binning on the relevant variables: x, P and z, for both hadrons (Q2 – x correlation) • Provide Q2 dependence • Explore for the first time the high x valence region (with overlap to HERMES, COMPASS, JLab6GeV data at lower x) PAC Approved Experiment

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