1 / 54

TMDs and PVDIS: JLab 6 GeV results and 12 GeV Plan

TMDs and PVDIS: JLab 6 GeV results and 12 GeV Plan. J. P. Chen , Jefferson Lab APFB2014, Hahndorf , Australia, April 7-11, 2014. TMDs with 6 GeV JLab : Exploration Recent and new results with a transversely Polarized 3 He (n )

dante
Download Presentation

TMDs and PVDIS: JLab 6 GeV results and 12 GeV Plan

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. TMDs and PVDIS: JLab 6 GeV results and 12 GeV Plan J. P. Chen , Jefferson Lab APFB2014, Hahndorf, Australia, April 7-11, 2014 • TMDs with 6 GeVJLab: Exploration • Recent and new results with a transversely Polarized 3He (n) • Collins/Sivers/Worm-gear asymmetries on pionsand Kaons • Inclusive hadron and electron SSA • JLab 12 GeV Plan for TMD study: Precision Multi-d Mapping • SoLID Program on TMDs • PVDIS with 6 GeVJLab: New Results • 12 GeV plan for PVDIS: SoLID Program

  2. JLab 12 GeV Upgrade The completion of the 12 GeV Upgrade of CEBAF was ranked the highest priority in the 2007 NSAC Long Range Plan. Add 5 cryomodules New Hall 20 cryomodules CHL-2 Add arc 20 cryomodules Add 5 cryomodules • Enhanced capabilities in existing Halls • Increase of Luminosity1035 - ~1039 cm-2s-1 Maintain capability to deliver lower pass beam energies : 2.2, 4.4, 6.6,….

  3. Unified View of Nucleon Structure d2kT d2rT TMD PDFs f1u(x,kT), .. h1u(x,kT)‏ GPDs/IPDs 5D Dist. Wpu(x,kT,r ) Wigner distributions 3D imaging dx & Fourier Transformation d2kT d2rT Form Factors GE(Q2), GM(Q2)‏ PDFs f1u(x), .. h1u(x)‏ 1D

  4. Leading-Twist TMD PDFs Nucleon Spin Quark Spin h1= Boer-Mulders f1 = h1L= Worm Gear Helicity g1 = h1= Transversity f1T= g1T= h1T= Sivers Worm Gear Pretzelosity : Probed with transversely pol target HERMES, COMPASS, JLab E06-010

  5. Tool: Semi-inclusive DIS (SIDIS) • Gold mine for TMDs • Access all eight leading-twist TMDs through spin-comb. & azimuthal-modulations • Tagging quark flavor/kinematics Scattering Plane

  6. Status of Transverse Spin/TMD Study Large single spin asymmetry in pp->pX (Fermi, RHIC-spin) Collins Asymmetries - sizable for the proton (HERMES and COMPASS) large at high x,p- and p+has opposite sign unfavored Collins fragmentation as large as favored (opposite sign)? - consistent with 0 for the deuteron (COMPASS) Sivers Asymmetries - non-zero for p+ from proton (HERMES), new COMPASS data - large for K+? Collins Fragmentation from Belle Global Fits/models: Anselminoet al., Yuan et al., Pasquiniet al., Ma et al., … Very active theoretical and experimental efforts JLab (6 GeV and 12 GeV), RHIC-spin, Belle, FAIR, J-PARC, EIC, … First neutron measurement from Hall A 6 GeV (E06-010) SoLID with polarized p and n(3He) at JLab 12 GeV Unprecedented precision with high luminosity and large acceptance

  7. Single Spin Asymmetries with A Transversely Polarized 3He (n) JLab Hall A E06-010 Published and Preliminary Results From SIDIS and Inclusive Reactions

  8. SIDIS: Separation of Collins, Sivers and pretzelocity effects through angular dependence

  9. E06‑010 Experiment Spokespersons: J. P. Chen, E. Cisbani, H. Gao, X. Jiang and J. C. Peng 7 PhD Thesis Students (graduated) + 2 new students Luminosity Monitor • First measurement on n (3He) • Transversely Polarized 3He Target • Polarized Electron Beam, 5.9 GeV • BigBite at 30º as Electron Arm • Pe = 0.7 ~ 2.2 GeV/c • HRSL at 16º as Hadron Arm • Ph = 2.35 GeV/c • Excellent PID for p/K/p Beam Polarimetry (Møller + Compton)

  10. E06-010 collaboration, X. Qian at al., PRL 107:072003(2011) 3He (n) Target Single-Spin Asymmetry in SIDIS neutron Collins SSA small Non-zero at highest x for p+ neutron Sivers SSA: negative for π+, Agree with Torino Fit Blue band: model (fitting) uncertainties Red band: other systematic uncertainties

  11. Asymmetry ALT Result J. Huang et al.,PRL. 108, 052001 (2012). Worm-Gear • neutron ALT : Positive for p- • Consist w/ model in signs, suggest larger asymmetry Trans helicity • Dominated by L=0 (S) and L=1 (P) interference To leading twist:

  12. Pretzelosity Results on Neutron • Analysis by Y. Zhang (Lanzhou) and X. Qian (Caltech) Extracted Pretzelosity Asymmetries, New Results In models, directly related to OAM, L=0 and L=2 interference • submitted to PRC, arXiv:1312.3047

  13. E06-010: Inclusive Hadron SSA (AN) Analysis by K, Allada (JLab), Y. Zhao (USTC), • Clear non-zero vertical target SSA • Opposite sign forp+andp- • Large for K+ vertical target PRC 89, 042201 (2014)

  14. E06-010: Inclusive Hadron SSA (AN) • Clear non-zero target SSA • Opposite sign forp+andp- • AN at low pT not very well • understood • Results consistent with predictions based on Sivers mechanism (valid at high pT) vertical target

  15. Inclusive Target Single Spin Asymmetry: DIS θ 3He e- • Unpolarizede- beam incident on 3He target polarized normal to the • electron scattering plane. • However, Ay=0 at Born level, •  sensitive to physics at order α2; two-photon exchange. • In DIS case: related to integral of Sivers • Physics Importance discussed in A. Metz’s paper

  16. Inclusive Target Single-Spin Asymmetry • Analysis by J. Katech(W&M), X. Qian (Caltech), • submitted to PRL, arXiv:1311.0197 Extracted neutron SSA from 3He(e,e’) • Results show 2-photon effects • Consistent with A. Metz’s prediction: 2-photon interact with 2 quarks and q-g-q correlator from Torino fit for Sivers (solid black) • Disagree with predictions based on KQW q-g-q correlator (red-dashed) • Disagree with predictions based on 2-photon interact with 1 quark (blue dashed)

  17. Future: TMD study 12 GeVJLab Precision Study of TMDs In the Valence Quark Region

  18. JLab 12 GeV Era: Precision Study of TMDs From exploration to precision study with 12 GeV JLab 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 and large acceptance

  19. SoLID for SIDIS/PVDIS with 12 GeVJLab • Exciting physics program: • Five approved experiments: • three SIDIS “A rated”, one PVDIS “A rated”, one J/Psi “A- rated” • International collaboration: nine countries and 50+ institutions • GEMs for tracking • Cherenkov and EM Calorimeter for electron PID • Heavy Gas Cherenkov and MRPC (TOF) for pion PID • CLEOII Magnet (official) • pCDRjust completed

  20. Mapping of Collins(Sivers) Asymmetries with SoLIDE12-10-006 (n) Spokespersons: J. P. Chen, H. Gao, X. Jiang, J. C. Peng and X. QianE12-11-108(p): K. Allada, J. P. Chen, H. Gao, X. Li and Z. E. MezianiBoth Approved with “A” Rating • Both p+ and p- • Precision Map in region x(0.05-0.65) z(0.3-0.7) Q2(1-8) PT(0-1.6) • <10% d quark tensor charge Collins (Sivers) Asymmetries

  21. Expected Improvement: Sivers Function f1T= • Significant Improvement in the valence quark (high-x) region • Illustrated in a model fit (from A. Prokudin)

  22. E12-11-107: Worm-gear functions (A rating )Spokespersons: J. P. Chen, J. Huang, Y. Qiang and W. Yan • Dominated by real part ofinterference between L=0 (S) and L=1 (P) states • No GPD correspondence • Lattice QCD -> Dipole Shift in mom. space. • Model Calculations -> h1L =? -g1T. h1L= Longi-transversity Trans-helicity Center of points: g1T=

  23. New : LOI – Dihadron in DIS on 3HeSpokespersons: J. P. Chen, A. Courtoy, H. Gao and J. Zhang • Access transversity in transversely polarized neutron target through π+ π- di-hadron production • Run simultaneously with SIDIS 3He (e,e’π±)X • Systematical check of two approaches to access h1 Asymmetry projection for one M-z bin

  24. Summary on TMD Program Unprecedented precision 4-d mapping of SSA Collins, Sivers, Pretzelosity and Worm-Gear Both polarized 3He (n) and polarized proton with SoLID Three “A” rated experiments approved. One LOI on di-hadron. Combining with the world data extract transversity and fragmentation functions for both u and d quarks determine tensor charge study TMDs for both valence and sea quarks learn quark orbital motion and quark orbital angular momentum study Q2 evolution Global efforts (experimentalists and theorists), global analysis much better understanding of multi-d nucleon structure and QCD Welcome new collaborators Longer-term future: Electron-Ion Collider to study sea and gluon TMD EIC in China (a new possibility)

  25. Parity Violating DIS at JLab 6 GeV New Results (Slides by X. Zheng)

  26. 6 GeV PVDIS Results D. Wang, …, X . Zheng, et al. Nature, 506, 7486, 67-70 (2014)

  27. World Knowledge on Electron-Quark Contact Interaction Terms Note the equal scale in horizontal and vertical direction. Yet data on C2q won't fit inside the frame.

  28. PVDIS at 6 GeV (JLab E08-011) Ran in Oct-Dec 2009, 100uA, 90% polarized electron beam, 20-cm liquid deuterium target Scaler-based fast counting DAQ specifically built for the 500kHz DIS rates w/ 104 pion rejection. Spokespeople: P. Reimer, R. Michaels, X.Z. Postdoc: Ramesh Subedi Grad. Students: Kai Pan (MIT), Xiaoyan Deng (UVa), PhD Students: Diancheng Wang (UVa),

  29. With JLab E08-011 Results Improved on C2q by factor of five Agree with Standard Model 2C2u-C2d is two sigma from zero, as predicted by the Standard Model.

  30. Parity Violating DIS at JLab 12 GeV SoLID Program

  31. PVDIS with SoLIDContact Person: P. Souder • High Luminosity on LD2 and LH2 • Better than 1% errors for small bins over large range kinematics • Test of Standard Model • Quark structure: • charge symmetry violation • quark-gluon correlations • d/u at large-x

  32. 12 GeV PVDIS Sensitivity: C1 and C2 Plots World’s data 6 GeV PVDIS Precision Data PVDIS Qweak Cs

  33. MRST (2004) QCD: Charge Symmetry Violation We already know CSV exists: • u-d mass difference δm = md-mu ≈ 4 MeV δM = Mn-Mp ≈ 1.3 MeV • electromagnetic effects • Direct observation of CSV—very exciting! • Important implications for PDF’s • Could be a partial explanation of the NuTeV anomaly For APV in electron-2H DIS: MRST PDF global with fit of CSV Martin, Roberts, Stirling, Thorne Eur Phys J C35, 325 (04) Broad χ2 minimum (90% CL)

  34. SoLID-J/y: Study Non-Perturbative Gluons Spokespersons: K. Hafidi, Z.E.Meziani, X. Qian, N. Sparveris and Z. Zhao • J/ψ: ideal probe of non-perturbative gluon • The high luminosity & large acceptance capability of SoLID enables a unique “precision” measurement near threshold • Search for threshold enhancement • Shed light on the conformal anomaly Trace Anomaly 50 days @ 1037 N/cm2/s Gluon Energy Quark Energy Quark Mass X. Ji PRL 74 1071 (1995)

  35. Summary • Nucleon TMD study have been exciting and fruitful • Recent and Preliminary Results on TMD studies from JLab • JLab 12 GeV :Planned SoLID program on TMDs Precision 4-d mapping of TMD asymmetries Precision experimental data + development in theory for Nucleon TMDs +… • lead to breakthrough in understanding QCD? • Results from 6 GeV PVDIS • JLab 12 GeV: Solid Program on PVDIS Low energy test of Standard Model Precision Hadron Structure Study: Charge Symmetry Violation, Higher-twist effect, d/u at high x

  36. Backup Slides

  37. Jefferson Lab at a Glance (12 GeV now! ) • CEBAF • High-intensity electron accelerator based onCW SRFtechnology • Emax = 6 GeV • Imax = 200 mA • Polmax = 85% 12 GeV • ~ 1400 Active Users • ~ 800 FTEs • 178 Completed Experiments @ 6 GeV • Produces ~1/3 of US PhDs in Nuclear Physics C A B A C B

  38. Unpolarized and Polarized TMDs Flavor PT Dependence JLab Hall C/B SIDIS Results

  39. Flavor PT Dependence from Theory • Chiral quark-soliton model (Schweitzer, Strikman, Weiss, JHEP, 1301 (2013) •  sea wider tail than valance f1u/f1d kT • Flagmentation model, Matevosyan, Bentz, Cloet, Thomas, PRD85 (2012) • unfavoredpion and Kaon wider than favored pion

  40. Hall C Results: Flavor PT Dependence (md)2 (m-)2 (m+)2 (mu)2 C

  41. Lattice A1 PT-dependence arXiv:1003.4549 A1 PT B.Musch et al arXiv:1011.1213 CLAS data suggests that width of g1 is less than the width of f1 plots courtesy of HarutAvagyan

  42. X. Qian at al., PRL 107:072003(2011) E06-010 3He Target Single-Spin Asymmetry in SIDIS 3He Collins SSA small Non-zero at highest x for p+ 3He Sivers SSA: negative for π+, Blue band: model (fitting) uncertainties Red band: other systematic uncertainties

  43. Asymmetry ALT Result J. Huang et al., PRL. 108, 052001 (2012). • 3He ALT : Positive for p- Worm-Gear. To leading twist:

  44. Inclusive Hadron Electroproduction e + N↑ h + X (h = p, K, p) pT • Why a non-zero AN isinteresting? • Analogues to AN in collision • Simpler than due to only one quark channel • Same transverse spin effects as SIDIS and p-p collisions (Sivers, Collins, twist-3) • Clean test TMD formalism (at large pT~ 1 GeV or more) • To help understand mechanism behind large AN in in the TMD framework

  45. Transverse SSA in Inclusive Hadron p- p+ False Asymmetry • Target spin flip every 20 minutes • Acceptance effects cancels • Overall systematic check with AN at ϕS= 0 • False asymmetry < 0.1%

  46. JLab Physics Program at 12 GeV Hall A Hall A – form factors, GPDs & TMDs , SRC Low-energy tests of the SM and Fund. Symmetry Exp SoLID, MOLLER. Hall B High luminosity, high resolution & dedicated equipments Hall B - 3-D nucleon structure via GPDs & TMDs Search new form of hadron. matter via Meson Spectr. 4p detector Hall C Hall C– precision determination of valence quark properties in nucleons and nuclei Hermetic detector Photon tagger high momentum spectrometers & dedicated equipments Hall D - exploring origin of confinement by studying exotic mesons using real photons Hall D

  47. U L T Multi-Halls SIDIS Program q N Hall C/SHMS L-T studies, precise p+/p-ratios Hall A/SBS High x - Q2, 2-3D Hall B/CLAS12 General survey, medium luminosity U Hall A/SOLID High Lumi and acceptance – 4D L T H2 D2 3He, NH3 H2/D2, NH3/ND3, HD

More Related