skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Top Quark Forward-Backward Asymmetry and Same-Sign Top Quark Pairs

Abstract

The top quark forward-backward asymmetry measured at the Tevatron collider shows a large deviation from standard model expectations. Among possible interpretations, a nonuniversal Z{sup '} model is of particular interest as it naturally predicts a top quark in the forward region of large rapidity. To reproduce the size of the asymmetry, the couplings of the Z{sup '} to standard model quarks must be large, inevitably leading to copious production of same-sign top quark pairs at the energies of the Large Hadron Collider (LHC). We explore the discovery potential for tt and ttj production in early LHC experiments at 7-8 TeV and conclude that if no tt signal is observed with 1 fb{sup -1} of integrated luminosity, then a nonuniversal Z{sup '} alone cannot explain the Tevatron forward-backward asymmetry.

Authors:
 [1];  [1];  [2]; ;  [3]
  1. High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  2. Institute for Physics and Mathematics of the Universe, University of Tokyo, Chiba 277-8568 (Japan)
  3. Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China)
Publication Date:
OSTI Identifier:
21538344
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 20; Other Information: DOI: 10.1103/PhysRevLett.106.201801; (c) 2011 American Institute of Physics; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; CERN LHC; COUPLINGS; FERMILAB TEVATRON; LUMINOSITY; PARTICLE RAPIDITY; POTENTIALS; STANDARD MODEL; T QUARKS; TEV RANGE 01-10; ACCELERATORS; CYCLIC ACCELERATORS; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; FIELD THEORIES; GRAND UNIFIED THEORY; MATHEMATICAL MODELS; OPTICAL PROPERTIES; PARTICLE MODELS; PARTICLE PROPERTIES; PHYSICAL PROPERTIES; POSTULATED PARTICLES; QUANTUM FIELD THEORY; QUARKS; STORAGE RINGS; SYNCHROTRONS; TEV RANGE; TOP PARTICLES; UNIFIED GAUGE MODELS

Citation Formats

Berger, Edmond L, Qinghong, Cao, Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, Chen, Chuan-Ren, Chongsheng, Li, and Hao, Zhang. Top Quark Forward-Backward Asymmetry and Same-Sign Top Quark Pairs. United States: N. p., 2011. Web. doi:10.1103/PHYSREVLETT.106.201801.
Berger, Edmond L, Qinghong, Cao, Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, Chen, Chuan-Ren, Chongsheng, Li, & Hao, Zhang. Top Quark Forward-Backward Asymmetry and Same-Sign Top Quark Pairs. United States. https://doi.org/10.1103/PHYSREVLETT.106.201801
Berger, Edmond L, Qinghong, Cao, Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, Chen, Chuan-Ren, Chongsheng, Li, and Hao, Zhang. 2011. "Top Quark Forward-Backward Asymmetry and Same-Sign Top Quark Pairs". United States. https://doi.org/10.1103/PHYSREVLETT.106.201801.
@article{osti_21538344,
title = {Top Quark Forward-Backward Asymmetry and Same-Sign Top Quark Pairs},
author = {Berger, Edmond L and Qinghong, Cao and Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 and Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 and Chen, Chuan-Ren and Chongsheng, Li and Hao, Zhang},
abstractNote = {The top quark forward-backward asymmetry measured at the Tevatron collider shows a large deviation from standard model expectations. Among possible interpretations, a nonuniversal Z{sup '} model is of particular interest as it naturally predicts a top quark in the forward region of large rapidity. To reproduce the size of the asymmetry, the couplings of the Z{sup '} to standard model quarks must be large, inevitably leading to copious production of same-sign top quark pairs at the energies of the Large Hadron Collider (LHC). We explore the discovery potential for tt and ttj production in early LHC experiments at 7-8 TeV and conclude that if no tt signal is observed with 1 fb{sup -1} of integrated luminosity, then a nonuniversal Z{sup '} alone cannot explain the Tevatron forward-backward asymmetry.},
doi = {10.1103/PHYSREVLETT.106.201801},
url = {https://www.osti.gov/biblio/21538344}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 20,
volume = 106,
place = {United States},
year = {Fri May 20 00:00:00 EDT 2011},
month = {Fri May 20 00:00:00 EDT 2011}
}