1. 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 at JLab)

2. The flavor decomposition of SIDIS
SIR2005 (May at JLab)

3. Assumptions in NLO FF Fits
Kretzer00:PRD62,054001
KKP00:NPB582,514
SIR2005 (May at JLab)

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

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

6. 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 at JLab)

7. 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 at JLab)

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

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

10. 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 at JLab)

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

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

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

14. Collins Asymmetry in Pion SIDIS
SIR2005 (May at JLab)

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

16. Collins Fragmentation Function Ratio
Efremov, Goeke & Schweitzer,hep-ph/
SIR2005 (May at JLab)

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

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

19. Collins Asymmetry for neutron target
SIR2005 (May at JLab)

20. 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 at JLab)

21. 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 at JLab)