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This content will become publicly available on January 7, 2017

Title: Predictions for the top-quark forward-backward asymmetry at high invariant pair mass using the principle of maximum conformality

In this study, the D0 collaboration at FermiLab has recently measured the top-quark pair forward-backward asymmetry in $$\bar{p}p$$ → $$t\bar{t}$$X reactions as a function of the $$t\bar{t}$$ invariant mass M$$t\bar{t}$$. The D0 result for AFB(M$$t\bar{t}$$ > 650 GeV) is smaller than AFB(M$$t\bar{t}$$) obtained for small values of M$$t\bar{t}$$, which may indicate an “increasing-decreasing” behavior for AFB(M$$t\bar{t}$$ > Mcut). This behavior is not explained using conventional renormalization scale setting, or even by a next-to-next-to-leading order (N2LO) QCD calculation—one predicts a monotonically increasing behavior. In the conventional scale-setting method, one simply guesses a single renormalization scale μr for the argument of the QCD running coupling and then varies it over an arbitrary range. However, the conventional method has inherent difficulties.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Chongqing Univ., Chongqing (People's Republic of China); Guizhou Minzu Univ., Guiyang (People's Republic of China)
  2. Chongqing Univ., Chongqing (People's Republic of China)
  3. Shandong Univ., Shandong (People's Republic of China)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
OSTI Identifier:
1213170
Report Number(s):
SLAC-PUB--16368
Journal ID: ISSN 2470-0010; PRVDAQ; arXiv:1508.03739
Grant/Contract Number:
AC02-76SF00515; 11275280; 11325525; CDJZR305513
Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 93; Journal Issue: 1; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS Experiment-HEP; Phenomenology-HEP; HEPPH