DeltaDoverD References
Data
Caption: The dashed line represents a pQCD prediction while the solid line represents the prediction from a hyperfine perturbed constituent quark model. The solid triangles are measurements from X. Zheng et al., Phys. Rev. Lett. 92 (2004) 012004 and the diamond are from Phys.Rev.D71:012003,2005. The squares represent a prediction of the precision obtained by a SIDIS measurement performed using and energy upgrade CEBAF and the upgraded CLAS. The risers represent systematic uncertainty and the error bar lines are statistical uncertainties.
File:Hep ex.0407032.pdf Quark helicity distributions in the nucleon for up, down, and strange quarks from semi-inclusive deep-inelastic scattering. By HERMES Collaboration (A. Airapetian et al.). DESY-04-107, Jul 2004. Published in Phys.Rev.D71:012003,2005. http://arXiv.org/pdf/hep-ex/0407032
Table XIV
File:Hep ex9906035.pdf Flavor Decomposition of the Polarized Quark Distributions in the Nucleon from Inclusive and Semi-inclusive Deep-inelastic Scattering, hep-ex/9906035 Hermes Data 1999
Table VII
| Xbj | Delta d/d | Stat Err | Sys Error |
|---|---|---|---|
| 0.033 | -0.1236 | 0.159 | 0.039 |
| 0.048 | 0.0588 | 0.1452 | 0.0543 |
| 0.065 | -0.1336 | 0.1307 | 0.0362 |
| 0.087 | -0.2572 | 0.1303 | 0.0495 |
| 0.0118 | -0.4876 | 0.1185 | 0.0841 |
| 0.0166 | -0.0918 | 0.1337 | 0.0675 |
| 0.239 | -0.5218 | 0.1646 | 0.0822 |
| 0.339 | -0.2799 | 0.1988 | 0.1694 |
| 0.447 | -0.8133 | 0.4074 | 0.2454 |
File:Nucl ex0308011.pdf "Precision Measurement of the Neutron Spin Asymmetry A1n and Spin Flavor Decomposition in the Valence Quark Region."
X. Zheng et al., Phys. Rev. Lett. 92 (2004) 012004.
| Xbj | Delta d/d | Stat Err | Sys Error | |
|---|---|---|---|---|
| 0.033 | -0.274 | 0.032 | 0.013 | 0.01 |
| 0.047 | -0.291 | 0.057 | 0.018 | 0.032 |
| 0.6 | -0.324 | 0.083 | 0.031 | 0.089 |
In a previous version of the above work the values were
| Xbj | Delta d/d | Stat Err | Sys Error |
|---|---|---|---|
| 0.033 | -0.351 | 0.035 | 0.034 |
| 0.047 | -0.939 | 0.063 | 0.053 |
| 0.6 | -0.44 | 0.092 | 0.142 |
Asymmetries
File:Hep ex 0707.4077.pdf The Polarised Valence Quark Distribution from semi-inclusive DIS. By COMPASS Collaboration (M. Alekseev et al.). CERN-PH-EP-2007-024, Jul 2007. 10pp. Published in Phys.Lett.B660:458-465,2008.
Fragmentation Functions
File:0709.2457.pdf Fragmentation FunctionGlobal analysis using e+e- data
File:Hep ph 0108055.pdf Fragmentation functions from semiinclusive DIS pion production and implications for the polarized parton densities. Stefan Kretzer, (Michigan State U.) , Elliott Leader, (Imperial Coll., London) , Ekaterina Christova, (Sofiya, Inst. Nucl. Res.) . MSU-HEP-10702, Aug 2001. 19pp. Published in Eur.Phys.J.C22:269-276,2001.
NLO analysis
File:Hep-ph 0603236.pdf A.M. Sissakian AIX archive hep-ph/0603236
Inclusive method
File:0810.4718.pdf CLAS 12 Science Program, V. Burkert, 2008