Probing Fragmentation Func. With SIDIS

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Presentation transcript:

Probing Fragmentation Func. With SIDIS Lingyan Zhu University of Illinois at Urbana-Champaign Unpolarized Fragmentation Functions JLab Hall A PR04-114: measurement of the pion and kaon SIDIS with unpolarized proton and deuterium target. Collins Fragmentation Functions JLab asymmetry Hall A E03-004: the measurement of the target single spin for SIDIS with transversely polarized He target. SIR2005 (May 18-20 at JLab)

The flavor decomposition of SIDIS SIR2005 (May 18-20 at JLab)

Assumptions in NLO FF Fits Kretzer00:PRD62,054001 KKP00:NPB582,514 SIR2005 (May 18-20 at JLab)

The impact of FFs on PDFs Florian, Navarro and Sassotrom, hep-ph/0504155 SIR2005 (May 18-20 at JLab) Also see Kretzer, Leader & Christova, EPC22,269(2001)

Different Sets of NLO FFs OPAL data EPC16(00)407 Albino, Kniehl and Kramer, hep-ph/0502188 SIR2005 (May 18-20 at JLab)

Unpolarized Pion SIDIS The semi-inclusive production of charged pions from proton and neutron target 3 unknowns 4 equations What is well constrained in the e+e- data is the sum of D++D- SIR2005 (May 18-20 at JLab)

FFs from HERMES SIDIS Kretzer, Leader & Christova, EPC22,269(2001) The fragmentation functions from HERMES SIDIS together with from e+e- data. at SIR2005 (May 18-20 at JLab)

FFs in the Field-Feynman model Hua & Ma, EPC30,207(2003); Field & Feynman NPB136,1(1978) (KLC) SIR2005 (May 18-20 at JLab)

Flavor Asymmetry in Kaons? Difficult to measure sea quark distributions in K+ ! SIR2005 (May 18-20 at JLab)

Unpolarized Kaon SIDIS The semi-inclusive production of charged kaons from proton and neutron target 5 unknowns 4(or 5?) Eqs At large x with sea quark contribution ignored. SIR2005 (May 18-20 at JLab)

Kaon Fragmentation Function Ratio If ignoring strange quark contribution, Projection for JLab Hall A PR04-114 SIR2005 (May 18-20 at JLab)

Amrath, Bacchetta & Metz, hep-ph/0504124 Collins Fragmentation Function from models Amrath, Bacchetta & Metz, hep-ph/0504124 (1) (2) (3) (4) SIR2005 (May 18-20 at JLab)

Collins Fragmentation Function from Data From HERMES longitudinal SIDIS with QSM: Efremov,Goeke&Schweitzer,hep-ph/0108213[erratum:PLB544,389(2002)] From DEPHI e+e- data: Efremov,Ivanshin,Smirnova,Tkatchev&Zulkarneev,hep-ph/9812522[erratum] From E704 pp data assuming only Collins effect M. Boglione & P.J. Mulders, PRD60,054007(1999)[hep-ph/9903354] From HERMES/COMPASS transverse SIDIS From BELLE: some preliminary results SIR2005 (May 18-20 at JLab)

Collins Asymmetry in Pion SIDIS SIR2005 (May 18-20 at JLab)

Collins Asymmetry from HERMES HERMES, PRL94,012002(2005) (hep-ex/0408013) Possible under the string fragmentation model SIR2005 (May 18-20 at JLab)

Collins Fragmentation Function Ratio Efremov, Goeke & Schweitzer,hep-ph/0412420 SIR2005 (May 18-20 at JLab)

Collins Asymmetry from COMPASS COMPASS, hep-ex/0503002 Solid: positive Open: negative SIR2005 (May 18-20 at JLab)

Collins Asymmetry for Deuteron Target Efremov, Goeke & Schweitzer,hep-ph/0412420 SIR2005 (May 18-20 at JLab)

Collins Asymmetry for neutron target SIR2005 (May 18-20 at JLab)

JLab Hall A Experiment E03-004 Measurement of Single Target-Spin Asymmetry on a Transversely Polarized 3He Target (Xiaodong Jiang, Jian-Ping Chen, Jen-Chieh Peng) Reaction 3He↑(e,e’π-)x Beam 6 GeV polarized e- at 15 μA Target 3He target, 50 mg/cm2, ~42% transverse polarization Electron detection BigBite with Solid angle = 60 msr and θLab = 300 Charged pion detection HRS with θLab = -160 SIR2005 (May 18-20 at JLab)

Summary We do not know very well about the unpolarized fragmentation functions. We know even less about Collins fragmentation functions. SIDIS can provide us some helpful information. SIR2005 (May 18-20 at JLab)