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Contalbrigo Marco INFN Ferrara

JLAB12 and the S tructure of H adrons. Contalbrigo Marco INFN Ferrara. QCD Evolution 13 7 th May 2013, JLab – Newport News. The Spin D egree of Freedom. e p → e p.

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Contalbrigo Marco INFN Ferrara

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  1. JLAB12 and the Structure of Hadrons Contalbrigo Marco INFN Ferrara QCD Evolution 13 7th May 2013, JLab – Newport News

  2. The Spin Degree of Freedom e p → e p Spin degrees of freedom can explain otherwise surprising phenomena and bring new insights into nuclear matter structure Fundamental: do not neglect it !! e p → e p PRC 68, 034325 (2003) xF QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 2

  3. The Spin Degree of Freedom In our exploration of the QCD micro-world Fundamental: do not neglect spin !! Two questions in Hadronic Physics await explanation since too long Single Spin Asymmetries Proton Spin Budget AN ? √s = 20 GeV pT< 2 GeV/c xF QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 3

  4. Quantum Phase-space Distributions of Quarks Wpq(x,kT,r) “Mother” Wigner distributions Probability to find a quarkqin a nucleon P with a certain polarization in a position r &momentum k d3r d2kT (FT) TMD PDFs: fpu(x,kT),… GPDs: Hpu(x,x,t), … Semi-inclusive measurements Momentum transfer to quark Direct info about momentum distribution Exclusive Measurements Momentum transfer to target Direct info about spatial distribution x=0,t=0 d2kT May explain SSA & Lam-Tung May solve proton spin puzzle √s = 20 GeV PDFs fpu(x),… AN pT< 2 GeV/c xF QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 4

  5. A World-wide Challenge EIC QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 5

  6. The SIDIS Landscape Limit defined by luminosity Different Q2 for same x range Your Text Here EIC 1034 1032 1031 1035 Complementary experiments Valence Sea QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 6

  7. The JLAB12 Facility

  8. add Hall D (and beam line) 12 GeV CEBAF Upgrade magnets and power supplies CHL-2 Enhance equipment in existing halls 6 GeV CEBAF Beam current 90 mA Beam polarization 85 % 2008-2014: Construction (funded at 99%) May 2012 6 GeV Accelerator Shutdown starts May 2013 Accelerator Commissioning starts October 2013 Hall Commissioning starts 2013-2015 Pre-Ops (beam commissioning) QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 8

  9. JLab12 Experimental Halls Hall-C Super High Momentum Spectrometer (SHMS) unpolarized SIDIS, hadron ID Hall-A Spectrometer Pair, polarized 3He target up to to 1038 cm-2 s-1hadron ID Hall-A Hall-B SOLID3He, NH3 polarized targets up to 1036 cm-2 s-1large acceptance, pion ID CLAS12 H,D polarized targets up to 1035 cm-2 s-1 “complete” acceptance, hadron ID QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 11

  10. The Hall-C High-momentum Spectrometers SIDIS cross-section factorization tests HMS 7 GeV/c spectrometer 10o-90o angular range e/h, p/K ID by Cherenkov Super-HMS 11 GeV/c spectrometer 5o-25o angular range e/h, p/K ID by Cherenkov QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 13

  11. The CLAS12 Large-Acceptance Spectrometer FTOF DC R3 R2 R1 Luminosity up to 1035 cm-2 s-1 Highly polarized electron beam EC RICH H and D polarized targets Broad kinematic range coverage (current to target fragmentation) TOF + RICH for hadron ID HTCC PCAL Solenoid Torus TMDs and GPDs comprehensive study, with special care on applicability QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 14

  12. CLAS12 Kinematic Coverage p+ acceptance Electron Large electron scattering angles (> 20o) mandatory to reach high Q2 values Intermediate anguar range (15-25o) mandatory to reach high PT values Electron The CLAS12 forward detector is perfectly suitable for high-Q2 and high-pT measurements since designed to cover up to 40 degrees angles QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 15

  13. Transversely Polarized HD-Ice Target HD-Ice target vsstandard nuclear targets (less luminosity for higher purity) • Advantages: • Minimize nuclear background • smaller dilution, no attenuation at large pT • Weak holding field (BdL~ 0.1 Tm) • wide acceptance, negligible beam deflection • Disadvantages: • Very long polarizing times (months) • Sensitivity to local heating by charged beams Deuterium dilution is under control R Suitable for di-hadron and recoil proton Ph2 T HD-ice ran from Nov/11 to May/12 at Jlab R&D work required to run with electron beams E06-101 up to 108g/s T1 ~ years QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 16

  14. The Hall-A High-Luminosity Spectrometers Present: spectrometer pair High-luminosity 3He target GEM trackers PID challenging Future: large acceptance detector Ultimate statistical precision in the valence region QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 17

  15. Polarize 3He Target QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 18

  16. PDFs and TMDs

  17. Leading Twist TMDs Number Density Helicity Transversity Quark polarisation Spin effects in unpolarized reactions pTdependenceof numberdensity Proton wave components with different OAM Sivers Nucleon polarisation pTdependenceof quarkhelicity Worm-gear Collinear physics tensor charge Worm-gear Boer Mulders Pretzelosity D-wave component not-spherical shape of the nucleon Orbital quark motion non-trivial gauge link process dependence Proton wave components with different OAM QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 20

  18. The SIDIS Case Number Helicity quark polarisation SIDIS cross section (transversely pol. target): Boer-Mulders Density TMD factorization for PT<<Q nucleon polarisation Worm-gear Transversity Involved phenomenology due to the convolution over transverse momentum Sivers Worm-gear Pretzelosity FF DF QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 21

  19. Longitudinal Cross-section Cornell data of 70’s To be accounted in any TMD asymmetry interpretation E12-06-104 Hall-C RDIS0 at Q2∞ due to scattering off spin-½ quarks RDIS sensitive to gluon and higher-twist effects RSIDIS(z,pT) = un-integrated RDIS QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 22

  20. Small-Ph Dependence T Map pfpT dependence for pion off proton and deuteron targets E12-09-017 Hall-C At pT> 0.2 GeV/c use dependencies measured in CLAS12 experiment Hall C - JLab QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 23

  21. Unpolarized Target Perturbative region Collinear factorization Non-perturbative TMD factorization Boer-Mulders spin-orbit effect E12-06-112 Hall-B QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 24

  22. Unpolarized Target ep e’ KX Measurements of kinematic (x,Q2,z,PT) will probe HT distribution functions E12-09-008 Hall-B kaon Line: Phys Rev D78 045022 Boer-Mulders from Sivers Collins from e+e- data Band: Phys Rev D78 034035 Boer-Mulders from DY data Collins from chiral limit In the perturbative limit 1/PTbehavior expected ALU~ 1/Q (Twist-3) E12-06-112 Hall-B QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 25

  23. Unpolarized Target ep e’ KX E12-09-008 Hall-B Measurements of kinematic (x,Q2,z,PT) will probe HT distribution functions kaon In the perturbative limit 1/PTbehavior expected ALU~ 1/Q (Twist-3) E12-06-112 Hall-B QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 26

  24. Quark Helicity Transverse momentum dependence of quark helicityvs number density Quark helicity at high-x is sensitive to orbital angular momentum. E12-07-104 Hall-B E12-06-109 Hall-B E12-06-110 Hall-C E12-06-122 Hall-A QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 27

  25. Quark Helicity at High-x E12-07-104 Hall-B QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 28

  26. Transversity Signals High-x and tensor charge Gaussian ansatz & role of Q2 evolution Gauss Ansatz NO DATA 1st collinear extraction ! 1stextraction of Transversity! d d u u xh1(x) xh1(x) xh1(x, k ) xh1(x, k ) T T Soffer bound ? Bacchetta et al., PRL 107 (2011) Anselmino et al. Phys. Rev. D 75 (2007) QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 29

  27. The Sivers effect Related to quark orbital angular momentum arXiv:1112.4423 Coverage at large xand relation with Drell-Yan Sign change is a crucial test of TMDs factorization arXiv:1107.4446 Non zero signals for p+ and K+ Significant Q2 evolution ? K+ signals larger than p+ x Coverage at large pTand x and relation with twist-3 collinear approach K+-p+ ? ? ? Sign mismatch between SIDIS and pp SSA ? HERMES p Sivers moment from SIDIS T3 correlator from pp QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 30

  28. CLAS12 Projections High resolution and broad range in pTto test perturb. non-perturb. transient and for Bessel function analysis Large x important to constrain the tensor charge C12-11-111 Hall-B Collins asymmetry Sivers asymmetry QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 31

  29. Statistical Precision @ CLAS12 Statistical errors 4D analysis on p+ QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 32

  30. Statistical Precision @ CLAS12 Sensitivity to so-far not-observed distributions C12-11-111 Hall-B Q2 dependence of Sivers asymmetry Test of TMDs evolution Di-hadron channel for h1 Test of TMDs extraction E12-12-109 Hall-B QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 33

  31. 3He AUT with Super-BigBite )X 40 days E12-11-007 Hall-A Precise 3D measurement on 3He with hadron ID ✓ neutron TMD ✓ flavor separation QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 34

  32. 3He Target with SOLID E12-10-006 Hall-A Luminosity: up to 1036 cm-2 s-1 AUT AUT E12-11-007 Hall-A Large angle detector AUL AUL Forward detector Acceptance: Electron 8-26 degrees Pion 8-16 degrees QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 35

  33. NH3 Target with SOLID C12-11-108 Hall-A J.-P. Chen QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 36

  34. FFS and GPDs

  35. Generalized parton distributions Encompass parton distributions and form factors Longitudinal momentum and transverse spatial position correlated information Access OAM Lq= Jq-½DS via Ji sum rule QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 38

  36. GPDs from FFs Inconsistency in DATA ? Diehl et al. arXiv: 1302.4604 Bacchetta et al. arXiv: 1107.5755 QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 39

  37. Nucleon Form Factors at High Q2 Related to GPDs at high |t|  structure of the nucleon at small transverse distances E12-09-019 Hall-A E12-07-104 Hall-B Ratio of quasi-elastic e-p to e-n scatterings off a deuteron target QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 40

  38. Nucleon Form Factors at High Q2 E12-09-016 Hall-A E12-07-109 Hall-A E12-11-009 Hall-C Ratio of recoil polarizations Asymmetry in quasi-elastic scattering QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 41

  39. DVCS E12-06-114 Hall-A QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 42

  40. p-DVCS AUL and ALU @ CLAS12 C12-06-119 Hall-B Q2 ALU 85 days beam time Q2 AUL -t x 120 days beam time x QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 43

  41. p-DVCS AUT @ CLAS12 ALT ALT AUT AUT C12-12-010 Hall-B QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 44

  42. d-DVCS ALU @ CLAS12 E12-11-003 Hall-B QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 45

  43. DVMP QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 46

  44. Exclusive p and k Electro-production E12-07-105 Hall-C E12-09-011 Hall-C QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 47

  45. Exclusive fand the Gluonic Radius E12-12-107 Hall-B From t slope  average impact parameter QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 48

  46. The JLab12 Charge Start of Accelerator commissioning expected in November and running beam to Hall-A in February 2014 Complete mapping (3D) of the nucleon in the valence region High potential of the complementary programs of 3 experimental halls QCD Evolution Workshop, 7th May 2013, JLab Contalbrigo M. 49

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