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Title: Implications of the principle of maximum conformality for the QCD strong coupling

The Principle of Maximum Conformality (PMC) provides scale-fixed perturbative QCD predictions which are independent of the choice of the renormalization scheme, as well as the choice of the initial renormalization scale. In this article, we will test the PMC by comparing its predictions for the strong coupling $$\alpha^s_{g_1}(Q)$$, defined from the Bjorken sum rule, with predictions using conventional pQCD scale-setting. The two results are found to be compatible with each other and with the available experimental data. However, the PMC provides a significantly more precise determination, although its domain of applicability ($$Q \gtrsim 1.5$$ GeV) does not extend to as small values of momentum transfer as that of a conventional pQCD analysis ($$Q \gtrsim 1$$ GeV). In conclusion, we suggest that the PMC range of applicability could be improved by a modified intermediate scheme choice or using a single effective PMC scale.
Authors:
ORCiD logo [1] ;  [2] ;  [2] ; ORCiD logo [3] ;  [4]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. Chongqing Univ., Chongqing (People's Republic of China)
  3. Stanford Univ., Stanford, CA (United States). SLAC National Accelerator Lab.
  4. Univ. de Costa Rica, San Jose (Costa Rica)
Publication Date:
Report Number(s):
JLAB-PHY-17-2394; DOE/OR/23177-4148; SLAC-PUB-16959
Journal ID: ISSN 0370-2693; PII: S0370269317305804
Grant/Contract Number:
AC05-06OR23177; AC02-76SF00515; 11625520
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 773; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1374949
Alternate Identifier(s):
OSTI ID: 1391895; OSTI ID: 1414836

Deur, Alexandre, Shen, Jian -Ming, Wu, Xing -Gang, Brodsky, Stanley J., and de Teramond, Guy F.. Implications of the principle of maximum conformality for the QCD strong coupling. United States: N. p., Web. doi:10.1016/j.physletb.2017.07.024.
Deur, Alexandre, Shen, Jian -Ming, Wu, Xing -Gang, Brodsky, Stanley J., & de Teramond, Guy F.. Implications of the principle of maximum conformality for the QCD strong coupling. United States. doi:10.1016/j.physletb.2017.07.024.
Deur, Alexandre, Shen, Jian -Ming, Wu, Xing -Gang, Brodsky, Stanley J., and de Teramond, Guy F.. 2017. "Implications of the principle of maximum conformality for the QCD strong coupling". United States. doi:10.1016/j.physletb.2017.07.024.
@article{osti_1374949,
title = {Implications of the principle of maximum conformality for the QCD strong coupling},
author = {Deur, Alexandre and Shen, Jian -Ming and Wu, Xing -Gang and Brodsky, Stanley J. and de Teramond, Guy F.},
abstractNote = {The Principle of Maximum Conformality (PMC) provides scale-fixed perturbative QCD predictions which are independent of the choice of the renormalization scheme, as well as the choice of the initial renormalization scale. In this article, we will test the PMC by comparing its predictions for the strong coupling $\alpha^s_{g_1}(Q)$, defined from the Bjorken sum rule, with predictions using conventional pQCD scale-setting. The two results are found to be compatible with each other and with the available experimental data. However, the PMC provides a significantly more precise determination, although its domain of applicability ($Q \gtrsim 1.5$ GeV) does not extend to as small values of momentum transfer as that of a conventional pQCD analysis ($Q \gtrsim 1$ GeV). In conclusion, we suggest that the PMC range of applicability could be improved by a modified intermediate scheme choice or using a single effective PMC scale.},
doi = {10.1016/j.physletb.2017.07.024},
journal = {Physics Letters. Section B},
number = C,
volume = 773,
place = {United States},
year = {2017},
month = {8}
}