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Title: Comment on measuring the tt forward-backward asymmetry at ATLAS and CMS

Abstract

We suggest a new possibility for ATLAS and CMS to explore the tt forward-backward asymmetry measured at the Tevatron, by attempting to reconstruct tt events, with one of the tops decaying semileptonically in the central region (|{eta}|<2.5) and the other decaying hadronically in the forward region (|{eta}|>2.5). For several models which give comparable Tevatron signals, we study the charge asymmetry at the LHC as a function of cuts on |{eta}| and on the tt invariant mass, m{sub tt}. We show that there is an interesting complementarity between cuts on |{eta}| and m{sub tt} to suppress the dominant and symmetric gg{yields}tt rate, and different combinations of cuts enhance the distinguishing power between models. This complementarity is likely to hold in other new physics scenarios as well, which affect the tt cross section, so it motivates extending tt reconstruction to higher |{eta}|.

Authors:
;  [1];  [1];  [2]
  1. Ernest Orlando Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
21607740
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.84.071504; (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; ASYMMETRY; CERN LHC; CROSS SECTIONS; FERMILAB TEVATRON; MASS; SEMILEPTONIC DECAY; SYMMETRY; WEAK HADRONIC DECAY; ACCELERATORS; CYCLIC ACCELERATORS; DECAY; PARTICLE DECAY; STORAGE RINGS; SYNCHROTRONS; WEAK PARTICLE DECAY

Citation Formats

Arguin, Jean-Francois, Ligeti, Zoltan, Freytsis, Marat, and Berkeley Center for Theoretical Physics, Department of Physics, University of California, Berkeley, California 94720. Comment on measuring the tt forward-backward asymmetry at ATLAS and CMS. United States: N. p., 2011. Web. doi:10.1103/PHYSREVD.84.071504.
Arguin, Jean-Francois, Ligeti, Zoltan, Freytsis, Marat, & Berkeley Center for Theoretical Physics, Department of Physics, University of California, Berkeley, California 94720. Comment on measuring the tt forward-backward asymmetry at ATLAS and CMS. United States. doi:10.1103/PHYSREVD.84.071504.
Arguin, Jean-Francois, Ligeti, Zoltan, Freytsis, Marat, and Berkeley Center for Theoretical Physics, Department of Physics, University of California, Berkeley, California 94720. Sat . "Comment on measuring the tt forward-backward asymmetry at ATLAS and CMS". United States. doi:10.1103/PHYSREVD.84.071504.
@article{osti_21607740,
title = {Comment on measuring the tt forward-backward asymmetry at ATLAS and CMS},
author = {Arguin, Jean-Francois and Ligeti, Zoltan and Freytsis, Marat and Berkeley Center for Theoretical Physics, Department of Physics, University of California, Berkeley, California 94720},
abstractNote = {We suggest a new possibility for ATLAS and CMS to explore the tt forward-backward asymmetry measured at the Tevatron, by attempting to reconstruct tt events, with one of the tops decaying semileptonically in the central region (|{eta}|<2.5) and the other decaying hadronically in the forward region (|{eta}|>2.5). For several models which give comparable Tevatron signals, we study the charge asymmetry at the LHC as a function of cuts on |{eta}| and on the tt invariant mass, m{sub tt}. We show that there is an interesting complementarity between cuts on |{eta}| and m{sub tt} to suppress the dominant and symmetric gg{yields}tt rate, and different combinations of cuts enhance the distinguishing power between models. This complementarity is likely to hold in other new physics scenarios as well, which affect the tt cross section, so it motivates extending tt reconstruction to higher |{eta}|.},
doi = {10.1103/PHYSREVD.84.071504},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 7,
volume = 84,
place = {United States},
year = {2011},
month = {10}
}