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Update on Experiments using SoLID Spectrometer Yi Qiang for SoLID Collaboration Hall A Collaboration Meeting Dec 16, 2011
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2 Overview SoLID: Solenoidal Large Intensity Device High rate capability: allow for high luminosity Full 2π azimuthal angular acceptance Three experiments approved PVDIS: E12-10-007 SIDIS of polarized 3 He: E12-10-006 and E12-11-007 All rated “A” by PAC Conditionally approved SIDIS using proton target: PR12-11-108 Instrumentation Update see Zhiwen Zhao’s talk 12/16/2011 SoLID Update
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3 SoLID Spectrometer 12/16/2011 SoLID Update PVDISSIDIS Can you find six differences between these panels? Target Location, Baffles (PVDIS), Cherenkov’s, GEM Layout, Extra E-Cal, Beam Pipe
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4 PVDIS E12-10-007 - Motivation 12/16/2011 SoLID Update Standard Model CSV at Quark Level Di-quarks in the nucleon (Q 2 Dependence) d/u for Hydrogen
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5 PVDIS - Statistics vs. Kinematics Strategy: ~0.5% precision over broad kinematic range for sensitive Standard Model test and detailed study of hadronic structure contributions 12/16/2011 SoLID Update 4 months at 11 GeV 2 months at 6.6 GeV Error bar σ A /A(%) shown at center of bins in Q 2, x Untangle physics with Approved beam time: 169 days
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6 SIDIS - Motivation TMDs provides 3-D momentum imaging of nucleons in addition to f 1 and g 1 A new phase of study, fast developing field SIDIS: gold mine for all TMDs Access all eight leading-twist TMDs through spin-comb. & azimuthal-modulations 12/16/2011 SoLID Update TMD Nucleon Spin QCD Dynami cs Quark OAM / Spin QCD Factoriz ation 3-D Tomogr aphy Lattice QCD Models in DIS Nucleon -> Plate Transverse motion preserved Transverse motion preserved
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7 SIDIS E12-10-006 Measurement of SSA in SIDIS with SoLID on a transversely polarized 3 He <10% d quark tensor charge (Collins moments) Fundamental property of nucleon benchmark test of Lattice QCD 4-D (x,Q 2,z,PT) mapping of Sivers moments Orbital Angular Momentum (OAM): Im[(L=0) q ×(L=1) q ] Search for sign change in Sivers function vs. Drell-Yan Aim for first non-zero Pretzelosity Moments Direct Probe of relativistic effect and OAM within models SIDIS using SoLID and 3 He Large acceptance and high Luminosity Complete 2π coverage: better angular separation 3 He target: > 60% polarization, L(n) ≈ 10 36 cm -2 s -1 Measuring cross section ratios on p, d, 3 He Study factorization, PT dependence, and FSI 12/16/2011 SoLID Update Collins Effect Sivers Effect
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8 SIDIS E12-11-007 SIDIS using Longitudinally Pol. 3He and SoLID Extraction of novel TMDs Many predictions available First Lattice QCD calculation Light-cone quark model and others No GPD Correspondence Sign of intrinsic transverse motion Links to Collinear PDFs 12/16/2011 SoLID Update p T dependent helicity distribution WORM-GEAR distributions, interference of OAMs: Re[(L=0) q ×(L=1) q ] Light-Cone CQM, arXiv:0806.2298 h 1L ⊥ (1) S-P int. P-D int. Lattice QCD, arXiv:0908.1283
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9 Example projections of Neutron Collins moments, 1 of 48 z-Q 2 panels, over 1000 bins for each asymmetry. Expected Improvement of Sivers Function From A. Prokudin E12-10-006: 90 days E12-11-007: 35 days Ultimate Precision 4-D Mapping
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10 SIDIS PR12-11-108 SIDIS Using SoLID and a Transversely Polarized Proton Target Perfect complementary experiment to 3 He SoLID SIDIS experiments: same coverage, similar statistics Conditionally approved on target Beam line similar to g2p/gep configuration JLab/UVa/SLAC polarized target, used in many different experiment (SANE, RSS etc..) o 3cm long NH 3 target o 5 Tesla superconducting magnet o Dynamic Nuclear Polarization(DNP) using microwave pumping o Target magnet optimized for longitudinal setting Need new magnet with larger opening angle to cover entire phase space Spin-flip using Adiabatic Fast Passage (AFP) technique Plans to improved packing fraction (using target disks instead of beads) 12/16/2011 SoLID Update
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11 Collaboration International Collaboration: 8 countries, 50+ institutions Rapid growth in US-China collaboration Magnet/Support/Simulations (Argonne/Duke/UVa/Umass) Tracking (UVa/Caltech/Tsinghua/USTC/CIAE/LanzhouU) Gas Cherenkov(Temple/Duke/Stony Brook) EM Calorimeter (UVa/Los Alamos/WM) TOF with MRPC (Tsinghua/Duke) DAQ and Trigger (Jlab/UMass) Polarimetry (UVa) Targets (Jlab/UVa) Infrastructure (Jlab/Duke) 12/16/2011 SoLID Update
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12 Progress/Plan Design of all subsystems are all progressing well. See Zhiwen’s talk for more hardware update. Some hardware beam tests are scheduled. New collaborators joined: Stony Brook group: Cherenkov detector/GEM William Mary group: Calorimeter Regular collaboration meetings. Physics division “brainstorming” meeting in Sep. 2011 went well. Next one on Jan. 6 2012. Preparing for Jlab director’s review. Informal contact with DOE. 12/16/2011 SoLID Update
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BACKUP SLIDES 12/16/2011 SoLID Update
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14 PVDIS Sensitivity - C1 and C2 Plots 12/16/2011 SoLID Update
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15 Slide from A. Prokudin
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16 SBS vs. SoLID From A. Puckett
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17 About <10% d quark Tensor Charge Precision is not directly limited by statistical precision. However, Precision is essential to control systematic uncertainties (SIDIS factorization, P T dependence, Higher Twist Contribution …) Based on current knowledge, expect to control systematic uncertainty down to 7-15%. Need data to tell us the final number! 10% is a the goal for our data.
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18 Tensor Charge Determination For u and d quark, the covered x range is about 0.05-0.75 (assuming a W>2.0 and W’>1.5 cut). Contribution from 0-0.05 is about 1% (u) and 4% (d) (Torino Group) Contribution fom 0.75-1.0 is about 1.5% (u) and 0.2% (d) Quoting 3-4% in total for contribution in unmeasured region.
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19 High luminosity: L(n) = 10 36 cm -2 s -1 Polarization in all 3 directions (L, T, V) Record high in-beam ~ 60% polarization Fast spin flip (every 20 minutes) Performance of 3 He Target
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