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Title: Top-pair forward-backward asymmetry beyond next-to-leading order

Abstract

We make use of recent results in effective theory and higher-order perturbative calculations to improve the theoretical predictions of the QCD contribution to the top-quark pair production forward-backward asymmetry at the Tevatron. In particular, we supplement the fixed-order next-to-leading order calculation with higher-order corrections from soft-gluon resummation at next-to next-to-leading order accuracy performed in two different kinematic schemes, which allows us to make improved predictions for the asymmetry in the pp and tt rest frames as a function of the rapidity and invariant mass of the tt pair. Furthermore, we provide binned results which can be compared with the recent measurements of the forward-backward asymmetry in events with a large pair invariant mass or rapidity difference. Finally, we calculate at NLO+NNLL order the top-quark charge asymmetry at the LHC as a function of a lower rapidity cutoff for the top and antitop quarks.

Authors:
; ;  [1];  [2];  [3]
  1. Institut fuer Physik (THEP), Johannes Gutenberg-Universitaet, D-55099 Mainz (Germany)
  2. New York City College of Technology, 300 Jay Street, Brooklyn, New York 11201 (United States)
  3. Institute for Theoretical Physics, University of Zuerich, CH-8057 Zuerich (Switzerland)
Publication Date:
OSTI Identifier:
21607762
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 84; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.84.074004; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; ASYMMETRY; CERN LHC; CORRECTIONS; FERMILAB TEVATRON; GLUONS; MASS; PAIR PRODUCTION; PARTICLE RAPIDITY; PERTURBATION THEORY; QUANTUM CHROMODYNAMICS; T QUARKS; ACCELERATORS; BOSONS; CYCLIC ACCELERATORS; ELEMENTARY PARTICLES; FERMIONS; FIELD THEORIES; INTERACTIONS; PARTICLE PRODUCTION; PARTICLE PROPERTIES; POSTULATED PARTICLES; QUANTUM FIELD THEORY; QUARKS; STORAGE RINGS; SYNCHROTRONS; TOP PARTICLES

Citation Formats

Ahrens, Valentin, Neubert, Matthias, Pecjak, Ben D., Ferroglia, Andrea, and Yang Lilin. Top-pair forward-backward asymmetry beyond next-to-leading order. United States: N. p., 2011. Web. doi:10.1103/PHYSREVD.84.074004.
Ahrens, Valentin, Neubert, Matthias, Pecjak, Ben D., Ferroglia, Andrea, & Yang Lilin. Top-pair forward-backward asymmetry beyond next-to-leading order. United States. doi:10.1103/PHYSREVD.84.074004.
Ahrens, Valentin, Neubert, Matthias, Pecjak, Ben D., Ferroglia, Andrea, and Yang Lilin. Sat . "Top-pair forward-backward asymmetry beyond next-to-leading order". United States. doi:10.1103/PHYSREVD.84.074004.
@article{osti_21607762,
title = {Top-pair forward-backward asymmetry beyond next-to-leading order},
author = {Ahrens, Valentin and Neubert, Matthias and Pecjak, Ben D. and Ferroglia, Andrea and Yang Lilin},
abstractNote = {We make use of recent results in effective theory and higher-order perturbative calculations to improve the theoretical predictions of the QCD contribution to the top-quark pair production forward-backward asymmetry at the Tevatron. In particular, we supplement the fixed-order next-to-leading order calculation with higher-order corrections from soft-gluon resummation at next-to next-to-leading order accuracy performed in two different kinematic schemes, which allows us to make improved predictions for the asymmetry in the pp and tt rest frames as a function of the rapidity and invariant mass of the tt pair. Furthermore, we provide binned results which can be compared with the recent measurements of the forward-backward asymmetry in events with a large pair invariant mass or rapidity difference. Finally, we calculate at NLO+NNLL order the top-quark charge asymmetry at the LHC as a function of a lower rapidity cutoff for the top and antitop quarks.},
doi = {10.1103/PHYSREVD.84.074004},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 7,
volume = 84,
place = {United States},
year = {2011},
month = {10}
}