STI Publications - View Publication #13181
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Publication Information
| Title | High precision determination of the Q^2-evolution of the Bjorken Sum | ||||
| Abstract | We present a significantly improved determination of the Bjorken Sum for 0.6<Q^2<4.8 GeV^2 using precise new g_1^p and g_1^d data taken with the CLAS detector at Jefferson Lab. A higher-twist analysis of the Q^2-dependence of the Bjorken Sum yields the twist-4 coefficient f_2^{p-n}=-0.064 +/-0.009_{-0.036}^{+0.032}. This leads to the color polarizabilities \chi_E^{p-n}=-0.032+/-0.024 and \chi_B^{p-n}=0.032+/-0.013. The strong force coupling is determined to be \alpha_s^MSbar (M_Z^2)=0.1226+/-0.0068$, which has an uncertainty a factor of 1.5 smaller than earlier estimates using polarized DIS data. This improvement makes the comparison between \alpha_s extracted from polarized DIS and other techniques a valuable test of QCD. | ||||
| Author(s) | Alexandre Deur, Yelena Prok, Volker Burkert, Don Crabb, F.-X. Girod, Keith Griffioen, Nevzat Guler, Sebastian Kuhn, Nicholas Kvaltine | ||||
| Publication Date | July 2014 | ||||
| Document Type | Journal Article | ||||
| Primary Institution | Thomas Jefferson National Accelerator Facility, Newport News | ||||
| Affiliation | Exp Nuclear Physics / Experimental Halls / Hall B | ||||
| Funding Source | |||||
| Proprietary? | No | ||||
| This publication conveys | Technical Science Results | ||||
| Document Numbers |
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| Associated with an experiment | Yes | ||||
| Experiment Number(s) |
E05-114
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| Associated with EIC | No | ||||
| Supported by Jefferson Lab LDRD Funding | No |
Journal Article
| Journal Name | Physical Review D |
| Refereed | Yes |
| Volume | 90 |
| Issue | 2 |
| Page(s) | 012009 |
Attachments/Datasets/DOI Link
| Document(s) |
1405.7854v2.pdf
(STI Document)
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| DOI Link | |
| Dataset(s) | (none) |
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