The role of pSIDIS data in QCD global fits

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Presentation transcript:

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

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

D. de Florian, G. Navarro and X. Jiang 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 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 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 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

Conclusions: R. Sassot DIS06

Conclusions: pSIDIS opens a window to sea quarks and helps to constrain other densities R. Sassot DIS06

Conclusions: pSIDIS opens a window to sea quarks and helps to constrain other densities overall picture combined NLO global fits: R. Sassot DIS06

Conclusions: pSIDIS opens a window to sea quarks and helps to constrain other densities perfect consistency pDIS/pSIDIS overall picture combined NLO global fits: R. Sassot DIS06

Conclusions: pSIDIS opens a window to sea quarks and helps to constrain other densities perfect consistency pDIS/pSIDIS improved constraints on pPDFs overall picture combined NLO global fits: R. Sassot DIS06

Conclusions: pSIDIS opens a window to sea quarks and helps to constrain other densities perfect consistency pDIS/pSIDIS improved constraints on pPDFs overall picture combined NLO global fits: best fits favor SU(3) in the sea R. Sassot DIS06

Conclusions: pSIDIS opens a window to sea quarks and helps to constrain other densities perfect consistency pDIS/pSIDIS improved constraints on pPDFs overall picture combined NLO global fits: best fits favor SU(3) in the sea agreement with preliminary data on R. Sassot DIS06

Conclusions: pSIDIS opens a window to sea quarks and helps to constrain other densities perfect consistency pDIS/pSIDIS improved constraints on pPDFs overall picture combined NLO global fits: best fits favour SU(3) in the sea agreement with preliminary data on next round: COMPASS, CLAS & E04-113 R. Sassot DIS06

Conclusions: pSIDIS opens a window to sea quarks and helps to constrain other densities perfect consistency pDIS/pSIDIS improved constraints on pPDFs overall picture combined NLO global fits: best fits favor SU(3) in the sea agreement with preliminary data on improved direct constraints on next round: COMPASS, CLAS & E04-113 R. Sassot DIS06

Conclusions: pSIDIS opens a window to sea quarks and helps to constrain other densities perfect consistency pDIS/pSIDIS improved constraints on pPDFs overall picture combined NLO global fits: best fits favor SU(3) in the sea agreement with preliminary data on improved direct constraints on next round: COMPASS, CLAS & E04-113 indirect constraints on R. Sassot DIS06

Conclusions: pSIDIS opens a window to sea quarks and helps to constrain other densities perfect consistency pDIS/pSIDIS improved constraints on pPDFs overall picture combined NLO global fits: best fits favor SU(3) in the sea agreement with preliminary data on improved direct constraints on next round: COMPASS, CLAS & E04-113 indirect constraints on flavour fragmentation R. Sassot DIS06

R. Sassot DIS06

NLO combined analysis: data R. Sassot DIS06

R. Sassot DIS06

R. Sassot DIS06

Fragmentation functions input: KRE: S. Kretzer Phys.Rev.D62 054001 (2000) KKP: B. A. Kniehl, G. Kramer, B. Potter, Nucl.Phys.B582 514 (2000) flavor separation: R. Sassot DIS06