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SoLID SIDIS Update

SoLID SIDIS Update. Zhiwen Zhao University of Virginia For SoLID Collaboration Hall A Collaboration Meeting 201 3 /12/17. SoLID ( Solenoidal Large Intensity Device). Lumi 1e 37 /cm 2 /s (open geometry) 3D hadron structure TMD (SIDIS on both neutron and proton) (3 EXPs, 1 LOI)

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SoLID SIDIS Update

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  1. SoLID SIDIS Update Zhiwen Zhao University of Virginia For SoLID Collaboration Hall A Collaboration Meeting 2013/12/17

  2. SoLID(Solenoidal Large Intensity Device) • Lumi1e37/cm2/s (open geometry) • 3D hadron structure • TMD (SIDIS on both neutron and proton) (3 EXPs, 1 LOI) • GPD (Timelike Compton Scattering)(1 LOI) • Gluon study • J/ production at threshold (1 EXP) • Lumi1e39/cm2/s (baffled geometry) • Standard Model test and hadron structure • PVDIS on both deuterium and hydrogen (1 EXP) High rate High dose High field General purpose device, large acceptance, high luminosity

  3. Leading-Twist TMD PDFs Quark Spin Nucleon Spin h1= Boer-Mulders f1 = h1L= Worm Gear Helicity g1 = h1= Collins/Transversity f1T= g1T= h1T= Sivers Worm Gear Pretzelosity

  4. Semi-Inclusive DIS (SIDIS) Precision mapping of transverse momentum dependent parton distributions (TMD) TMD links: Nucleon spin Parton spin Parton intrinsic motion

  5. SoLID: Precision Study of TMDs From exploration to precision study with 12 GeVJLab Transversity: fundamental PDFs, tensor charge TMDs: 3-d momentum structure of the nucleon  Quark orbital angular momentum Multi-dimensional mapping of TMDs 4-d (x,z,P┴,Q2) Multi-facilities, global effort Precision  high statistics high luminosity large acceptance E12-10-006: SIDIS on transversely polarized 3He @ 90 days E12-11-007: • SIDIS on Longitudinally polarized 3He @ 35 days • LOI-12-13-002: • Dihadron SIDIS on transversely polarized 3He E12-11-108: • SIDISon transversely polarized proton @ 120 days

  6. SoLID SIDIS Setup • Tracking: GEM Tracker • Electron Identification: • Large angle • EM calorimeter (LAEC) including Scintillator Pad Detector (SPD) • Forward angle • EM calorimeter (FAEC) including Scintillator Pad Detector (SPD) • Light Gas Cerenkov (LGCC) • Pion identification: • Heavy Gas Cerenkov (HGCC) • TOF (MRPC)

  7. Requirement of SIDIS • Kinematics Coverage: • 0.05 ~ 0.6 in x (valence) • 0.3 ~ 0.7 in z (factorization region) • PT up to ~ 1 GeV (TMD Physics) • Fixed target  Q2 coverage 1-8 GeV2 (~ 2 GeV2 in ΔQ2 at fixed x) • Luminoisity: • 3He Unpolarized ~ 1037 N/cm2/s • NH3 Unpolarized ~ 1036N/cm2/s • Polarized 3He Target: • ~ 60% higher polarization • Fast spin flip (<20 mins) • Polarized NH3 Target: • Jlab/UVa target with upgraded design of the magnet • Spin flip every two hours average • ~70% in-beam polarization • Beamline chicane to transport beam through 5T target magnetic field • Electron PID: • <1% Pion contamination (asymmetry point of view) • Pion PID: • <1% Kaons and Protons • <1% electron contamination • Optics of Reconstruction: • < a few % in δP/P • < 1 mr in polar angle • < 10 mr in azimuthal angle • ~ 1-2 cm vertex resolution • DAQ: • ~ 3kHz physics coincidence • < 100 kHz coincidence rate • Limits: 300 MB/s to tape

  8. Radiation and Luminosity Estimation Updated simulation with full background

  9. SIDIS He3 Target Collimator collimator target Zhiwen Zhao, XinQian A pair of collimators are optimized to block background from both target windows into forward angle detectors The acceptance without (black) and with (red) the collimators

  10. SIDIS He3 Electron Trigger DIS electron (Q2>1, W>2) acceptance on FAEC with SoLID CLEO magnet and 40cm target • FAEC: Radius and momentum dependent trigger threshold to select DIS electron by cutting on the line of Q2=1 • LAEC: Trigger at 3GeV Pion trigger eff. VS Mom 1GeV 2GeV 3GeV 4GeV 5GeV Electron/photon trigger eff. VS Mom 1GeV 2GeV 3GeV 4GeV 5GeV Jin Huang, Zhiwen Zhao

  11. SIDIS He3 Charged Particle Trigger Trigger eff. VS Mom electron photon pion proton Jin Huang, Zhiwen Zhao FAEC only, pion rate drops very quickly at large angle Cut on MIP only to preserve pions and suppress low energy background

  12. SIDIS He3 EC Trigger Rate Jin Huang, Zhiwen Zhao Need photon suppression by LGCC, SPD and MRPC Need pion suppression by LGCC Some of electrons and positrons from the pair production of gamma from pi0 decay can be suppressed by LGCC,SPD or MRPC depending on where the conversion happens

  13. SIDIS He3 LGCC Background Rate Michael Paolone Low energy background rate 6.6MHz Hadron (from target) accidental rate 2MHz

  14. SIDIS SPD and MRPC Photon Rejection Fired layer count in MRPC for charged particle (blue) and gamma (red) Energy deposit in SPD for electron (blue), pion (red) and gamma (black) Zhihong Ye, Jin Huang, Zhiwen Zhao SPD or MRPC alone can reach 10:1 rejection Combined together, they can reach ~ 20:1 rejection due to their correlation

  15. SIDIS He3 Trigger rate Forward angle electron trigger rate, combining FAEC,SPD,MRPC and LGCC, 140kHz Large angle electron trigger rate, combining LAEC and SPD, 20kHz Forward angle charged particle trigger rate, combining FAEC,SPD and MRPC, 18.7MHz Total coincidence rate ~ 90kHz with 30ns time window

  16. SoLID HGCC Design Update MehdiMeziane

  17. SoLID GEM Test at Fermi Lab Kondo Gnanvo 1m long GEM (largest in the world) for SoLID built at UVa Successfully tested with APV25/SRS readout at Fermi Lab in Oct 2013

  18. Gluon Study Using J/ψ ? • J/ψ, a charm-anti-charm system • Little (if not zero) common valence quark between J/ψ and nucleon • Quark exchange interactions are strongly suppressed • Pure gluonic interactions are dominant • J/ψ, a probe of the strong color field in the nucleo • Multiple gluon exchange possible near threshold • Not much data available at that region

  19. SoLID J/ψ Setup (E12-12-006) e p → e′p′ J/ψ(e- e+) γ p → p′ J/ψ(e- e+) • Detect decay e- e+ pair • Detect (or not) scattering e for electroproduction (or photoproduction) • Detect recoil p to be exclusive

  20. DVCS and TCS: access the same GPDs Spacelike Deeply Virtual Compton Scattering Timelike Compton Scattering γ*p → γ p′ γ p → γ*(e- e+)p′ Information on the real part of the Compton amplitude can be obtained from photoproduction of lepton pairs using unpolarized photons

  21. SoLID TCS Setup (LOI-12-13-001) γ p → p′ γ*(e- e+) e p → e′p′ γ*(e- e+) • Detect decay e- e+ pair • Detect recoil p to be exclusive • Cut on missing momentum and mass to ensure quasi-real process

  22. Summary • We have made good progress and are ready for the director review in early next year • SoLID SIDIS setup is a general device. More experiments may be proposed to take advantage of its large acceptance and high luminosity features

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