NLO QCD fits to polarized DIS & SIDIS data NLO QCD fits to polarized DIS & SIDIS data Rodolfo Sassot Universidad de Buenos Aires Global Analysis Workshop,

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Presentation transcript:

NLO QCD fits to polarized DIS & SIDIS data NLO QCD fits to polarized DIS & SIDIS data Rodolfo Sassot Universidad de Buenos Aires Global Analysis Workshop, BNL October 8, 2007

R. Sassot BNL, October 8, why spin? indispensable tool for unveiling hadron structure, why polarized DIS? historical benchmark for hadron structure, spin & unexpected physics. 90’s experimental programs. QCD improved description for spin dependent processes LO vs. NLO why NLO QCD global fits?

R. Sassot BNL, October 8, flavor and quark-antiquark discriminatrion, what do we get from data? fits to inclusive/semi-inclusive polarized data. uncertainties in pPDFs: Δq, Δg. how can we improve the present picture? further constraints from forthcoming data. fragmentation functions. ¯ impact “direct” Δg measurements. increasead statistics, new/forthcoming data why polarized SIDIS? sea quarks and flavor dependence in hadronization.

R. Sassot BNL, October 8, The case for pSIDIS: pDIS flavor decomposition

R. Sassot BNL, October 8, The case for pSIDIS: Flavor decomposition in pSIDIS

R. Sassot BNL, October 8, DNS NLO combined analysis: parameterizations pDIS can probe: pSIDIS give access to: positivity relative to MRST02: 20 parameters A.D. Maritn et al. Eur.Phys.J.C28 (2002) 455 D. de Florian, G. Navarro, R.S. Phys.Rev.D (2005)

R. Sassot BNL, October 8, DNS NLO combined analysis: data

R. Sassot BNL, October 8, Fragmentation functions input in DNS: KRE: S. Kretzer Phys.Rev.D (2000) KKP: B. A. Kniehl, G. Kramer, B. Potter, Nucl.Phys.B (2000) flavor separation :

R. Sassot BNL, October 8, DNS Results: =458 d.o.f 313 pDIS 165 pSIDIS

R. Sassot BNL, October 8, Uncertainties: J. Pumplin et al. Phys.Rev.D (2002)

R. Sassot BNL, October 8,

R. Sassot BNL, October 8, Consistency with independent measurements: G. Navarro, R.S. PRD (2006)

R. Sassot BNL, October 8, STAR Coll., PRL97, , (2006)

R. Sassot BNL, October 8, Next steps: DSS FFs: kaon fragmentation, h + /h - MSTW PDFs: positivity constraints, evolution New Compass SIDIS data: flavor at low x Compass/Hermes DIS data (Q2-bin): gluon shape? RHIC data: A LL, jets: Δg

R. Sassot BNL, October 8, New “DSSV” pPDFs: pre-pre-pre-pre-preliminary…. NEW

R. Sassot BNL, October 8, New “DSSV” pPDFs: pre-pre-pre-pre-preliminary from Daniel’s talk why has Δs changed?? old FFs were overestimated

R. Sassot BNL, October 8,

R. Sassot BNL, October 8, Conclusions: pPDFs have evolved dramatically: pSIDIS opens a window to sea quarks and helps to constrain other densities dependence on FFs as a caveat: future prospects: successfull experimental programs tools for the analysis (NLO) from ‘scenarios’ to ‘constraints’ overall picture combined NLO global fits: consistency pDIS/pSIDIS improved constraints on pPDFs best fits favor small Δg and SU(3)? needs improvement! encouraging! new polarized data: RHIC, COMPASS, JLAB, eRHIC? new generation of FFs most exciting in the spin saga: the unexpected…

R. Sassot BNL, October 8, Acknowledgments: A. Deshpande, W. Vogelsang RIKEN-BNL, hospitality and support.

R. Sassot BNL, October 8,

R. Sassot BNL, October 8,

R. Sassot BNL, October 8,

R. Sassot BNL, October 8, Results: =458 d.o.f 313 pDIS 165 pSIDIS Interplay between pDIS and pSIDIS D. de Florian, G. Navarro, R.S. Phys.Rev.D (2005)