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

Wang, Sheng -Quan; Wu, Xing -Gang; Si, Zong -Guo; Brodsky, Stanley J.

doi:10.1103/PhysRevD.93.014004

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

Journal Article · Thu Jan 07 00:00:00 EST 2016 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.93.014004· OSTI ID:1213170

Wang, Sheng -Quan ^[1]; Wu, Xing -Gang ^[2]; Si, Zong -Guo ^[3]; Brodsky, Stanley J. ^[4]

Chongqing Univ., Chongqing (People's Republic of China); Guizhou Minzu Univ., Guiyang (People's Republic of China)
Chongqing Univ., Chongqing (People's Republic of China)
Shandong Univ., Shandong (People's Republic of China)
SLAC National Accelerator Lab., Menlo Park, CA (United States)

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 A_FB(M_$$t\bar{t}$$ > 650 GeV) is smaller than A_FB(M_$$t\bar{t}$$) obtained for small values of M_$$t\bar{t}$$, which may indicate an “increasing-decreasing” behavior for A_FB(M_$$t\bar{t}$$ > M_cut). 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.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-76SF00515; 11275280; 11325525; CDJZR305513

OSTI ID:: 1213170

Alternate ID(s):: OSTI ID: 1234276

Report Number(s):: SLAC-PUB-16368; PRVDAQ; arXiv:1508.03739

Journal Information:: Physical Review D, Vol. 93, Issue 1; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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