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The role of pSIDIS data in QCD global fits

The role of pSIDIS data in QCD global fits. Rodolfo Sassot Universidad de Buenos Aires. DIS06, Tsukuba April 22, 2006. how SIDIS data help to constrain , and. lagrange multipliers to estimate uncertainties. In collaboration with

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The role of pSIDIS data in QCD global fits

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  1. The role of pSIDIS data in QCD global fits Rodolfo Sassot Universidad de Buenos Aires DIS06, Tsukuba April 22, 2006

  2. how SIDIS data help to constrain , and • lagrange multipliers to estimate uncertainties R. Sassot DIS06

  3. In collaboration with D. de Florian, G. Navarro and X. Jiang based on Phys.Rev.D71, 094018 (2005), hep-ph/0602236, and references therein. R. Sassot DIS06

  4. why do we use semi-inclusive data? R. Sassot DIS06

  5. why do we use semi-inclusive data? • polarized inclusive DIS (pDIS) data fail to constrain pPDFs. R. Sassot DIS06

  6. why do we use semi-inclusive data? • polarized inclusive DIS (pDIS) data fail to constrain pPDFs. • e.m. interactions can not discriminate quarks from antiquarks: R. Sassot DIS06

  7. why do we use semi-inclusive data? • polarized inclusive DIS (pDIS) data fail to constrain pPDFs. • e.m. interactions can not discriminate quarks from antiquarks: valence vs. sea quarks R. Sassot DIS06

  8. why do we use semi-inclusive data? • polarized inclusive DIS (pDIS) data fail to constrain pPDFs. • e.m. interactions can not discriminate quarks from antiquarks: valence vs. sea quarks • spin/flavour symmetry: model dependence to be tested R. Sassot DIS06

  9. why do we use semi-inclusive data? • polarized inclusive DIS (pDIS) data fail to constrain pPDFs. • e.m. interactions can not discriminate quarks from antiquarks: valence vs. sea quarks • spin/flavour symmetry: model dependence to be tested • polarized semi-inclusive (SIDIS) data R. Sassot DIS06

  10. why do we use semi-inclusive data? • polarized inclusive DIS (pDIS) data fail to constrain pPDFs. • e.m. interactions can not discriminate quarks from antiquarks: valence vs. sea quarks • spin/flavour symmetry: model dependence to be tested • polarized semi-inlcusive (SIDIS) data SMC @ CERN: p, d h± HERMES @ DESY: p,d,He h±, π±, K± COMPASS @ CERN: ….. CLAS & E04-113 @ JLAB: ….. R. Sassot DIS06

  11. how do we deal with pSIDIS data? R. Sassot DIS06

  12. how do we deal with pSIDIS data? R. Sassot DIS06

  13. how do we deal with pSIDIS data? W R. Mertig, W. L. van Neerven, Z.Phys.C70 637 (1996) W. Vogelsang, Phys.Rev.D54 2023 (1996) R. Sassot DIS06

  14. how do we deal with pSIDIS data? W R. Mertig, W. L. van Neerven, Z.Phys.C70 637 (1996) W. Vogelsang, Phys.Rev.D54 2023 (1996) R. Sassot DIS06

  15. how do we deal with pSIDIS data? W R. Mertig, W. L. van Neerven, Z.Phys.C70 637 (1996) W. Vogelsang, Phys.Rev.D54 2023 (1996) R. Sassot DIS06

  16. how do we deal with pSIDIS data? R. Sassot DIS06

  17. how do we deal with pSIDIS data? D. de Florian et al. Nuc.Phys.B470 (1996) 195 M. Stratmann W.Vogelsang Phys.Rev.D64 (2001) 114007 R. Sassot DIS06

  18. how do we deal with pSIDIS data? D. de Florian et al. Nuc.Phys.B470 (1996) 195 M. Stratmann W.Vogelsang Phys.Rev.D64 (2001) 114007 R. Sassot DIS06

  19. NLO combined analysis: R. Sassot DIS06

  20. NLO combined analysis: pDIS can probe: R. Sassot DIS06

  21. NLO combined analysis: pDIS can probe: pSIDIS give access to: R. Sassot DIS06

  22. NLO combined analysis: pDIS can probe: pSIDIS give access to: R. Sassot DIS06

  23. NLO combined analysis: pDIS can probe: pSIDIS give access to: positivity relative to MRST02: A.D. Maritn et al. Eur.Phys.J.C28 (2002) 455 R. Sassot DIS06

  24. does it work? R. Sassot DIS06

  25. does it work? • consistency: pSIDIS data fix quarks without spoiling R. Sassot DIS06

  26. does it work? • consistency: pSIDIS data fix quarks without spoiling R. Sassot DIS06

  27. does it work? • consistency: pSIDIS data fix quarks without spoiling R. Sassot DIS06

  28. does it work? • consistency: pSIDIS data fix quarks without spoiling combined λ=1 478-20=458 d.o.f 313 pDIS 165 pSIDIS R. Sassot DIS06

  29. does it work? • consistency: pSIDIS data fix quarks without spoiling combined λ=1 478-20=458 d.o.f 313 pDIS 165 pSIDIS pDIS λ=0 R. Sassot DIS06

  30. does it work? • consistency: pSIDIS data fix quarks without spoiling pSIDIS 478-20=458 d.o.f 313 pDIS 165 pSIDIS combined pDIS R. Sassot DIS06

  31. does it work? • consistency: pSIDIS data fix quarks without spoiling pSIDIS 478-20=458 d.o.f 313 pDIS 165 pSIDIS combined pDIS KRE: S. Kretzer Phys.Rev.D62 054001 (2000) R. Sassot DIS06

  32. does it work? • consistency: pSIDIS data fix quarks without spoiling pSIDIS 478-20=458 d.o.f 313 pDIS 165 pSIDIS combined pDIS KRE: S. Kretzer Phys.Rev.D62 054001 (2000) KKP: B. A. Kniehl, G. Kramer, B. Potter, Nucl.Phys.B582 514 (2000)

  33. what do we get from pSIDIS data? R. Sassot DIS06

  34. what do we get from pSIDIS data? • do pSIDIS data actually constrain ? R. Sassot DIS06

  35. what do we get from pSIDIS data? • do pSIDIS data actually constrain ? J. Pumplin et al. Phys.Rev.D65 014011 (2002) R. Sassot DIS06

  36. what do we get from pSIDIS data? • do pSIDIS data actually constrain ? J. Pumplin et al. Phys.Rev.D65 014011 (2002) R. Sassot DIS06

  37. what do we get from pSIDIS data? • do pSIDIS data actually constrain ? J. Pumplin et al. Phys.Rev.D65 014011 (2002) KRE: S. Kretzer Phys.Rev.D62 054001 (2000) R. Sassot DIS06

  38. what do we get from pSIDIS data? • do pSIDIS data actually constrain ? J. Pumplin et al. Phys.Rev.D65 014011 (2002) KRE: S. Kretzer Phys.Rev.D62 054001 (2000) KKP: B. A. Kniehl, G. Kramer, B. Potter, Nucl.Phys.B582 514 (2000) R. Sassot DIS06

  39. what do we get from pSIDIS data? • do pSIDIS data actually constrain ? J. Pumplin et al. Phys.Rev.D65 014011 (2002) KRE: S. Kretzer Phys.Rev.D62 054001 (2000) KKP: B. A. Kniehl, G. Kramer, B. Potter, Nucl.Phys.B582 514 (2000) R. Sassot DIS06

  40. what do we get from pSIDIS data? • do pSIDIS data actually constrain ? J. Pumplin et al. Phys.Rev.D65 014011 (2002) KRE: S. Kretzer Phys.Rev.D62 054001 (2000) KKP: B. A. Kniehl, G. Kramer, B. Potter, Nucl.Phys.B582 514 (2000) R. Sassot DIS06

  41. what do we get from pSIDIS data? • do pSIDIS data actually constrain ? J. Pumplin et al. Phys.Rev.D65 014011 (2002) KRE: S. Kretzer Phys.Rev.D62 054001 (2000) KKP: B. A. Kniehl, G. Kramer, B. Potter, Nucl.Phys.B582 514 (2000) R. Sassot DIS06

  42. does it make sense? R. Sassot DIS06

  43. does it make sense? R. Sassot DIS06

  44. does it make sense? R. Sassot DIS06

  45. (not included in the fit) R. Sassot DIS06

  46. (not included in the fit) (not included in the fit) R. Sassot DIS06

  47. what can we expect from pSIDIS in the future? R. Sassot DIS06

  48. what can we expect from pSIDIS in the future? • COMPASS d h± (inminent) • CLAS p π± (inminent) • JLAB E04-113 p,d h±, π±, K± (2008) E04-113 proton R. Sassot DIS06

  49. what can we expect from pSIDIS in the future? • COMPASS d h± (inminent) • CLAS p π± (inminent) • JLAB E04-113 p,d h±, π±, K± (2008) E04-113 proton R. Sassot DIS06

  50. what can we expect from pSIDIS in the future? • COMPASS d h± (inminent) • CLAS p π± (inminent) • JLAB E04-113 p,d h±, π±, K± (2008) E04-113 proton R. Sassot DIS06

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