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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 Rodolfo Sassot Universidad de Buenos Aires DIS06, Tsukuba April 22, 2006
how SIDIS data help to constrain , and • lagrange multipliers to estimate uncertainties R. Sassot DIS06
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
why do we use semi-inclusive data? R. Sassot DIS06
why do we use semi-inclusive data? • polarized inclusive DIS (pDIS) data fail to constrain pPDFs. R. Sassot DIS06
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
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
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
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
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
how do we deal with pSIDIS data? R. Sassot DIS06
how do we deal with pSIDIS data? R. Sassot DIS06
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
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
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
how do we deal with pSIDIS data? R. Sassot DIS06
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
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
NLO combined analysis: R. Sassot DIS06
NLO combined analysis: pDIS can probe: R. Sassot DIS06
NLO combined analysis: pDIS can probe: pSIDIS give access to: R. Sassot DIS06
NLO combined analysis: pDIS can probe: pSIDIS give access to: R. Sassot DIS06
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
does it work? R. Sassot DIS06
does it work? • consistency: pSIDIS data fix quarks without spoiling R. Sassot DIS06
does it work? • consistency: pSIDIS data fix quarks without spoiling R. Sassot DIS06
does it work? • consistency: pSIDIS data fix quarks without spoiling R. Sassot DIS06
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
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
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
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
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)
what do we get from pSIDIS data? R. Sassot DIS06
what do we get from pSIDIS data? • do pSIDIS data actually constrain ? R. Sassot DIS06
what do we get from pSIDIS data? • do pSIDIS data actually constrain ? J. Pumplin et al. Phys.Rev.D65 014011 (2002) R. Sassot DIS06
what do we get from pSIDIS data? • do pSIDIS data actually constrain ? J. Pumplin et al. Phys.Rev.D65 014011 (2002) R. Sassot DIS06
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
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
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
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
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
does it make sense? R. Sassot DIS06
does it make sense? R. Sassot DIS06
does it make sense? R. Sassot DIS06
(not included in the fit) R. Sassot DIS06
(not included in the fit) (not included in the fit) R. Sassot DIS06
what can we expect from pSIDIS in the future? R. Sassot DIS06
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
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
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