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Extraction of pPDFs from pDIS/pSIDIS at NLO

Extraction of pPDFs from pDIS/pSIDIS at NLO. Rodolfo Sassot Universidad de Buenos Aires. DIS05, Madison April 27, 2005. In collaboration with D. de Florian and G. Navarro,. based on hep-ph/0504155 and references therein. Outline:. role of pDIS and pSIDIS in the extraction of pPDFs.

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Extraction of pPDFs from pDIS/pSIDIS at NLO

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  1. Extraction of pPDFs from pDIS/pSIDIS at NLO Rodolfo Sassot Universidad de Buenos Aires DIS05, Madison April 27, 2005

  2. In collaboration with D. de Florian and G. Navarro, based on hep-ph/0504155 and references therein. R. Sassot DIS05

  3. Outline: • role of pDIS and pSIDIS in the extraction of pPDFs. R. Sassot DIS05

  4. Outline: • role of pDIS and pSIDIS in the extraction of pPDFs. • results from a NLO combined global analysis R. Sassot DIS05

  5. Outline: • role of pDIS and pSIDIS in the extraction of pPDFs. • results from a NLO combined global analysis • uncertainties in pPDFs R. Sassot DIS05

  6. Outline: • role of pDIS and pSIDIS in the extraction of pPDFs. • results from a NLO combined global analysis • uncertainties in pPDFs • uncertainties in future/ongoing measurements R. Sassot DIS05

  7. Role of pDIS and pSIDIS in the extraction of pPDFs: • pDIS as the main source of information on pPDFs. R. Sassot DIS05

  8. Role of pDIS and pSIDIS in the extraction of pPDFs: • pDIS as the main source of information on pPDFs. • hadronic decays data & assumptions: flavor symmetry R. Sassot DIS05

  9. Role of pDIS and pSIDIS in the extraction of pPDFs: • pDIS as the main source of information on pPDFs. • hadronic decays data & assumptions: flavor symmetry • e.m. interactions can not discriminate quarks from antiquarks: R. Sassot DIS05

  10. Role of pDIS and pSIDIS in the extraction of pPDFs: • pDIS as the main source of information on pPDFs. • hadronic decays data & assumptions: flavor symmetry • e.m. interactions can not discriminate quarks from antiquarks: large uncertainties in sea quark and gluon pPDFs R. Sassot DIS05

  11. Role of pDIS and pSIDIS in the extraction of pPDFs: • pDIS as the main source of information on pPDFs. • hadronic decays data & assumptions: flavor symmetry • e.m. interactions can not discriminate quarks from antiquarks: large uncertainties in sea quark and gluon pPDFs • pSIDIS as a way out: R. Sassot DIS05

  12. Role of pDIS and pSIDIS in the extraction of pPDFs: • pDIS as the main source of information on pPDFs. • hadronic decays data & assumptions: flavor symmetry • e.m. interactions can not discriminate quarks from antiquarks: large uncertainties in sea quark and gluon pPDFs • pSIDIS as a way out: SMC @ CERN: first steps; encouraging HERMES @ DESY: from consistency checks to constraints COMPASS @ CERN: ….. E04-113 @ JLAB: ….. R. Sassot DIS05

  13. pDIS/pSIDIS I R. Sassot DIS05

  14. pDIS/pSIDIS I W R. Mertig, W. L. van Neerven, Z.Phys.C70 637 (1996) W. Vogelsang, Phys.Rev.D54 2023 (1996) R. Sassot DIS05

  15. pDIS/pSIDIS I W R. Mertig, W. L. van Neerven, Z.Phys.C70 637 (1996) W. Vogelsang, Phys.Rev.D54 2023 (1996) R. Sassot DIS05

  16. pDIS/pSIDIS I W R. Mertig, W. L. van Neerven, Z.Phys.C70 637 (1996) W. Vogelsang, Phys.Rev.D54 2023 (1996) R. Sassot DIS05

  17. pDIS/pSIDIS II R. Sassot DIS05

  18. pDIS/pSIDIS II D. de Florian et al. Nuc.Phys.B470 (1996) 195 M. Stratmann W.Vogelsang Phys.Rev.D64 (2001) 114007 R. Sassot DIS05

  19. pDIS/pSIDIS II D. de Florian et al. Nuc.Phys.B470 (1996) 195 M. Stratmann W.Vogelsang Phys.Rev.D64 (2001) 114007 R. Sassot DIS05

  20. NLO combined analysis: parameterizations R. Sassot DIS05

  21. NLO combined analysis: parameterizations pDIS can probe: R. Sassot DIS05

  22. NLO combined analysis: parameterizations pDIS can probe: pSIDIS give access to: R. Sassot DIS05

  23. NLO combined analysis: parameterizations pDIS can probe: pSIDIS give access to: R. Sassot DIS05

  24. NLO combined analysis: parameterizations pDIS can probe: pSIDIS give access to: positivity relative to MRST02: A.D. Maritn et al. Eur.Phys.J.C28 (2002) 455 R. Sassot DIS05

  25. NLO combined analysis: parameterizations pDIS can probe: pSIDIS give access to: 20 parameters positivity relative to MRST02: A.D. Maritn et al. Eur.Phys.J.C28 (2002) 455 R. Sassot DIS05

  26. NLO combined analysis: data R. Sassot DIS05

  27. Fragmentation functions input: KRE: S. KretzerPhys.Rev.D62 054001 (2000) KKP: B. A. Kniehl, G. Kramer, B. Potter, Nucl.Phys.B582 514 (2000) R. Sassot DIS05

  28. Fragmentation functions input: KRE: S. KretzerPhys.Rev.D62 054001 (2000) KKP: B. A. Kniehl, G. Kramer, B. Potter, Nucl.Phys.B582 514 (2000) flavorseparation: R. Sassot DIS05

  29. Fragmentation functions input: KRE: S. KretzerPhys.Rev.D62 054001 (2000) KKP: B. A. Kniehl, G. Kramer, B. Potter, Nucl.Phys.B582 514 (2000) flavorseparation: R. Sassot DIS05

  30. Fragmentation functions input: KRE: S. KretzerPhys.Rev.D62 054001 (2000) KKP: B. A. Kniehl, G. Kramer, B. Potter, Nucl.Phys.B582 514 (2000) flavorseparation: R. Sassot DIS05

  31. Results: 478-20=458 d.o.f 313 pDIS 165 pSIDIS R. Sassot DIS05

  32. Results: 478-20=458 d.o.f 313 pDIS 165 pSIDIS R. Sassot DIS05

  33. Results: 478-20=458 d.o.f 313 pDIS 165 pSIDIS R. Sassot DIS05

  34. Results: 478-20=458 d.o.f 313 pDIS 165 pSIDIS R. Sassot DIS05

  35. Results: 478-20=458 d.o.f 313 pDIS 165 pSIDIS R. Sassot DIS05

  36. Uncertainties: J. Pumplin et al. Phys.Rev.D65 014011 (2002) R. Sassot DIS05

  37. Uncertainties: J. Pumplin et al. Phys.Rev.D65 014011 (2002) R. Sassot DIS05

  38. Uncertainties: J. Pumplin et al. Phys.Rev.D65 014011 (2002) R. Sassot DIS05

  39. Uncertainties: J. Pumplin et al. Phys.Rev.D65 014011 (2002) R. Sassot DIS05

  40. J. Pumplin et al. Phys.Rev.D65 014011 (2002) R. Sassot DIS05

  41. R. Sassot DIS05

  42. Future/ongoing measurements: Y. Fukao hep-ex/0501049 R. Sassot DIS05

  43. Future/ongoing measurements: Y. Fukao hep-ex/0501049 R. Sassot DIS05

  44. Future/ongoing measurements: A. Bressan , hep-ex/0501040 X. Jiang et al. , hep-ex/041203 R. Sassot DIS05

  45. Conclusions: successfull experimental programs • pPDFs have evolved dramatically: tools for the analysis (NLO) from ‘scenarios’ to ‘constraints’ R. Sassot DIS05

  46. Conclusions: successfull experimental programs • pPDFs have evolved dramatically: tools for the analysis (NLO) from ‘scenarios’ to ‘constraints’ • pSIDIS opens a window to sea quarks and helps to constrain other densities R. Sassot DIS05

  47. Conclusions: successfull experimental programs • pPDFs have evolved dramatically: tools for the analysis (NLO) from ‘scenarios’ to ‘constraints’ • pSIDIS opens a window to sea quarks and helps to constrain other densities perfect consistency pDIS/pSIDIS • overall picture combined NLO global fits: improved constraints on pPDFs best fits favor SU(3) in the sea R. Sassot DIS05

  48. Conclusions: successfull experimental programs • pPDFs have evolved dramatically: tools for the analysis (NLO) from ‘scenarios’ to ‘constraints’ • pSIDIS opens a window to sea quarks and helps to constrain other densities perfect consistency pDIS/pSIDIS • overall picture combined NLO global fits: improved constraints on pPDFs best fits favor SU(3) in the sea • dependence on FFs as a caveat & opportunity: tackle both problems together? R. Sassot DIS05

  49. Conclusions: successfull experimental programs • pPDFs have evolved dramatically: tools for the analysis (NLO) from ‘scenarios’ to ‘constraints’ • pSIDIS opens a window to sea quarks and helps to constrain other densities perfect consistency pDIS/pSIDIS • overall picture combined NLO global fits: improved constraints on pPDFs best fits favor SU(3) in the sea • dependence on FFs as a caveat & opportunity: tackle both problems together? PHENIX: • future prospects: encouraging COMPASS & E04-113 and FFs R. Sassot DIS05

  50. R. Sassot DIS05

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