1 / 37

Nilanga Liyanage, University of Virginia, USA

Overview of SoLID: So lenoidal L arge I ntensity D evice for Precision Study of Nucleon Structure and Test of Standard Model . Nilanga Liyanage, University of Virginia, USA. SoLID Physics Program @ 12 GeV JLab Transverse Spin and Transverse Structure: TMDs Parity Violating DIS

nysa
Download Presentation

Nilanga Liyanage, University of Virginia, USA

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. Overview of SoLID: Solenoidal Large Intensity Device for Precision Studyof Nucleon Structure and Test of Standard Model Nilanga Liyanage, University of Virginia, USA • SoLID Physics Program @ 12 GeVJLab • Transverse Spin and Transverse Structure: TMDs • Parity Violating DIS • J/y and more • SoLID Instrumentation • Current Status and Plan • SoLID Collaboration • acknowledgement: thanks to Dr. J.P Chen and the SoLID collaboration for some slides and calculations.

  2. Physics Program for SoLID • SoLID: large acceptance, capable of handling high luminosity • (up to~1039 with baffle, up to ~1037 without baffle) • Ideal for precision Inclusive-DIS (PVDIS) and SIDIS experiments • Excellent for selected exclusive reactions (ex. J/Y) • Five high impact experiments approved: • SIDIS: E12-10-006 (3He-T), E12-11-007 (3He-L), E12-11-108 (proton-T) • PVDIS: E12-10-007 (deuteron and proton) • J/y: E12-12-006

  3. SoLID Physics Program (I) Transverse Spin and Transverse Structure: TMDs

  4. Nucleon Spin Quark Spin Leading-Twist TMD PDFs h1= Boer-Mulders f1 = h1L= Worm Gear Helicity g1 = h1= Transversity f1T= g1T= h1T= Sivers Worm Gear Pretzelosity : Survive trans. Momentum integration

  5. Status of Transverse Spin/Structure 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 - consistent with zero for p- from proton and for all channels from deuteron - large for K+? - sign mismatch? Collins Fragmentation from Belle Global Fits/models: Anselmino et al., Yuan et al., Pasquini et al., Ma et al., … TMD evolution, a lot of progress in the last couple years 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

  6. COMPASS Sivers asymmetry 2010 data x > 0.032 region - comparison with HERMES results

  7. New high-xbjResults(II) from JLab Hall A E06-010 with a Transversely Polarized 3He (n)

  8. Results on Neutron Collins asymmetries are not large, except at x=0.34 Sivers negative Blue band: model (fitting) uncertainties Red band: other systematic uncertainties

  9. Neutron ALT Extraction • Corrected for proton dilution, fp • Predicted proton asymmetry contribution < 1.5% (π+), 0.6% (π-) • Dominated by L=0 (S) and L=1 (P) interference • Consist w/ model in signs, suggest larger asymmetry Trans-helicity

  10. Extracted Results on Neutron Extracted Pretzelosity Asymmetries, For both p+ and p-, consistent with zero within uncertainties. Preliminary Results

  11. Preliminary K+/K- Collins and SiversAsymmetries on 3He

  12. 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

  13. Nucleon Structure (TMDs) with SoLID • Semi-inclusive Deep Inelastic Scattering program: • Large Acceptance + High Luminosity • + Polarized targets 4-D mapping of asymmetries Tensor charge, TMDs … • Lattice QCD, QCD Dynamics, Models. Solenoidal Large Intensity Device (SoLID) • International collaboration (8 countries, • 50+ institutes and 190+ collaborators) • Rapid Growth in US‐China Collaboration

  14. Mapping of Collins/Siver Asymmetries with SoLID E12-10-006 3He(n), Spokespersons: J. P. Chen, H. Gao, X. Jiang, J-C. Peng, X. QianE12-11-007(p) , Spokespersons: K. Allda, J. P. Chen, H. Gao, X. Li, Z-E. Mezinai • 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% u/d quark tensor charge

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

  16. E12-11-107: Worm-gear functions Spokespersons: J. P. Chen/J. Huang/Y. Qiang/ 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=

  17. Precision dihadron (p+/p-) production on a transversely polarized 3He (n) • Extract transversity on neutron • Provide crucial inputs for flavor separation of transversity Measure Transversity via Dihadron with SoLIDLOI to JLab PAC 40, J. Zhang, J. P. Chen, A. Courtoy, H. Gao Wide xb and Q2 coverages Projected Statistics error for one (Mpp,zpp) bin, integrated over all y and Q2.

  18. Discussion Unprecedented precision 4-d mapping of SSA Collins and Sivers Study factorization with x and z-dependences Study PT dependence Combining with the world data extract transversity and fragmentation functions for both u and d quarks determine tensor charges study TMDs in the valence region study quark orbital angular momentum study Q2 evolution Global efforts (experimentalists and theorists), global analysis much better understanding of multi-d nucleon structure and QCD Long-term future: EIC to map sea and gluon SSAs

  19. SoLID Physics Program (II) Parity Violating Deep Inelastic Scattering Precision Test of Standard Model and Precision Study of Hadron Properties

  20. A A A Parity Violating Deep Inelastic Scattering (PVDIS) V V V V V V A A A • Especially good way to access hadronic axial vector currents, the term; in nucleon PV experiments large theoretical uncertainty due to electroweak radiative corrections, but in PVDIS scattering is off isolated quarks and these corrections are calculable. • Iso-scaler targets like deuterium are nice because most hadronic corrections cancel. • At x > 0.4 only valance quarks are important

  21. PVDIS with SoLID: E12-10-007:Spokespersons : Souder, Reimer, Liyanage • 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

  22. 12 GeV PVDIS Sensitivity: C1 and C2 Plots World’s data 6 GeV PVDIS Precision Data PVDIS Qweak Cs

  23. 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)

  24. QCD: Higher Twist From the Quark Parton Model (QPM) to QCD Add DGLAP evolution Add higher order terms in the Operator Product Expansion (OPE)↔Higher Twist Terms Quark-gluon diagram Parton Model—leading twist What is a true quark-gluon operator? Quark-gluon operators correspond to transverse momentum QCD equations of motion Di-quarks

  25. MRST, PLB582, 222 (04) QCD:Higher Twist--MRST Fits Order of DGLAP influences size of HT F2(x,Q2)=F2(x)(1+D(x)/Q2) Q2min=Q2(W=2) Q2=(W2-M2)/(1/x-1) Higher twist falls slowly compared to PDF’s at large x. If C(x)~D(x), there is large sensitivity al large x.

  26. Coherent Program of PVDIS Study Strategy: requires precise kinematics and broad range • Measure Ad in narrow bins of x, Q2with 0.5% precision • Cover broad Q2 range for x in [0.3,0.6] to constrain HT • Search for CSV with x dependence of Ad at high x • Use x > 0.4, high Q2 to measure a combination of the Ciq’s Fit data to:

  27. SoLID PVDIS Configuration EM Calorimeter (forward angle) Cherenkov GEM Baffle Target GEM CLEO II Coil and Yoke

  28. Statistical Errors (%) vs. Kinematics Statistical sensitivity for SOLID spectrometer Error bar σA/A(%) shown at center of bins in Q2, x 4 months at 11 GeV 2 months at 6.6 GeV

  29. PVDIS on the Proton: d/u at High x Deuteron analysis has large nuclear corrections (Yellow) APV for the proton has no such corrections (complementary to BONUS/MARATHON) 3-month run

  30. Zhiwen Zhao SoLID-J/y: Study Non-Perturbative Gluons • 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)

  31. SoLID Instrumentation Magnet, Detectors, DAQs, Simulations

  32. SoLID Instrumentation

  33. Solenoidal Magnet • Magnet options studied: (UVa+Argonne+JLab) • First narrowed from 6 options to 2, • CLEO/BaBar/CDF/ZEUS/Glue-X/New •  CLEO or BaBar • Both satisfy needs, both available • Talked to both parties, obtained information • Detailed discussion with CLEO • Field study, force study, • Engineering study, including cost estimation • Site visit •  CLEO was chosen • Discussion with DOE • Position paper sent to DOE, just got favorable response • Will move the magnet to JLab in 2014/2015 • Refurbish

  34. Detectors: Overview • Tracking: GEMs: • Five Chinese groups+ US side: UVa/Temple • Conceptual design mostly complete • R&D on-going, together with SuperBigBite, EIC projects • e/pi separation (I) Electromagnetic Calorimeter (UVa+Los Almos+ W&M) • COMPASS style Shashlyk calorimeter • e/pi separation (II) light gas Cherenkov (Temple) • Magnetic field effect, performance studied, in-beam test • Conceptual design complete, supporting structure • pi/K separation (I) heavy gas Cherenkov (Duke) • Field effect, performance studied • Conceptual design complete, supporting structure • pi/K separation(II) MRPC (Tsinghua) • In-beam test, publication

  35. SoLID in Hall A

  36. SoLID Status and Plan • Strong International Collaboration: • 8 countries, 50+ institutes and 190+ collaborators • 10 Chinese institutions, contribute to GEMs (5), MRPC • Magnet: • CLEO magnet chosen, engineering study, position paper to DOE • Simulations: full package with GEANT4, • physics, background, neutrons, detector design, … • Detectors: “finalized” conceptual design • light Cherenkov, heavy Cherenkov, GEMs, MRPC • calorimeters (shashlyk), forward and large-angle • Baffle, DAQ • Targets, Beam Polarimetry • Director’s review: early fall, charge available • 1st draft of Pre-Conceptual Design Report ready • Schedule: review/MIE 2013, DOE approval (CD) process 2013-2015, • construction 2016-2018, experiments starts in 2018? • great opportunities for new groups / young people

  37. Summary • A challenge: Understand Strong QCD • New development: direct comparison of experiments with theory • Needs multi (transverse) dimension • Needs precision: high luminosity and large acceptance • SoLID @ JLab 12 GeV: exciting physics program 4 “A” rated, 1 “A-” rated experiments approved • SIDIS: Precision extraction of transversity/tensor charge/ TMDs • PVDIS: low energy test of standard model and hadron properties • J/y threshold production: study gluons • LOIs/Future proposals (di-hadron, TCS) • Exciting new opportunities  lead to breakthroughs? • New collaborators welcome

More Related