NLO QCD fits to polarized semi-inclusive DIS data

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Presentation transcript:

NLO QCD fits to polarized semi-inclusive DIS data Rodolfo Sassot Universidad de Buenos Aires Primer pagina JLAB MAY 5, 2005

30 years studying the short distance structure of the proton: from hints on point-like structure, to parton densities. QCD + DIS high precision PDFs predictions and tests of ‘new physics’ R. Sassot JLAB, May 5, 2005

why spin? why polarized DIS? why polarized SIDIS? inessential complication? indispensable tool for unveiling hadron structure, search for the unexpected. why polarized DIS? best benchmark for hadron structure, top cited spin crisis, 90’s experimental programs. why polarized SIDIS? flavor and quark-antiquark discriminatrion, increasing statistics, universality and precision of fragmentation functions (FF). R. Sassot JLAB, May 5, 2005

Outline: QCD improved parton model description of polarized DIS and SIDIS global QCD fits to polarized data. uncertainties in pPDFs uncertainties in future/ongoing measurements R. Sassot JLAB, May 5, 2005

Polarized DIS (pDIS) ‘structure function’ ‘parton distribution’ (pPDF) R. Sassot JLAB, May 5, 2005

pDIS flavor decomposition R. Sassot JLAB, May 5, 2005

QCD improved parton model: LO and NLO ‘naïve’ ‘LO’ W R. Mertig, W. L. van Neerven, Z.Phys.C70 637 (1996) W. Vogelsang, Phys.Rev.D54 20023 (1996) ‘NLO’ ‘add a gluon’ R. Sassot JLAB, May 5, 2005

Polarized SIDIS (pSIDIS) D. de Florian, C. Garcia Canal, R.S. Nuc.Phys.B470 195 (1996) ‘fragmentation function’ (FF) R. Sassot JLAB, May 5, 2005

Flavor decompositon in pSIDIS R. Sassot JLAB, May 5, 2005

NLO combined analysis: and non perturbative quantities to be measured, QCD predicts Q -dependence, not boundary conditions 2 data obtained for different values of x and Q 2 1. make ansatz about the x-dependence at some scale 2. evolve from to and compute 3. compare with data 4. fit to minimize R. Sassot JLAB, May 5, 2005

R. Sassot JLAB, May 5, 2005

borrowed from W. Vogelsang R. Sassot JLAB, May 5, 2005

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 JLAB, May 5, 2005

NLO combined analysis: data R. Sassot JLAB, May 5, 2005

Fragmentation functions input: KRE: S. Phys.Rev.D62 054001 (Kretzer 2000) KKP: B. A. Kniehl, G. Kramer, B. Potter, Nucl.Phys.B582 514 (2000) flavor separation: R. Sassot JLAB, May 5, 2005

Results: Interplay between pDIS and pSIDIS 478-20=458 d.o.f 313 pDIS R. Sassot JLAB, May 5, 2005

Uncertainties: J. Pumplin et al. Phys.Rev.D65 014011 (2002) R. Sassot JLAB, May 5, 2005

R. Sassot JLAB, May 5, 2005

Future/ongoing measurements: R. Sassot JLAB, May 5, 2005

Future/ongoing measurements: R. Sassot JLAB, May 5, 2005

Conclusions: pPDFs have evolved dramatically: 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 & CLAS, E04-113 and FFs R. Sassot JLAB, May 5, 2005

Xiaodong Jiang, fruitfull collaboration, Acknowledgments: Xiaodong Jiang, fruitfull collaboration, JLAB, hospitality and support. R. Sassot JLAB, May 5, 2005

R. Sassot JLAB, May 5, 2005

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 JLAB, May 5, 2005

Uncertainties: R. Sassot JLAB, May 5, 2005