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Title: Polarized view of the top asymmetry

Abstract

Recent experimental results from the CDF collaboration which study the top forward-backward asymmetry have strengthened the case that new physics is playing a role in tt production. Here, we propose a set of measurements, built from the charged lepton kinematics in semileptonic and fully leptonic tt events, designed to further probe the underlying causes of this asymmetry both at the Tevatron and at the LHC. Using a set of conservative reference models, we find that measurements of the charged lepton asymmetry, top polarization, and tt spin correlation can establish the existence of new physics and distinguish between competing models both at the Tevatron and the LHC. At the Tevatron, discrimination between models is possible at the 3{sigma} level. At the LHC, we demonstrate that a top forward-backward asymmetry can be established at > or approx. 3{sigma} in the first {approx}5 fb{sup -1} of data and show how competing explanations can be further disentangled.

Authors:
 [1];  [2];  [3];  [4]
  1. Department of Physics, Harvard University, Cambridge, Massachusetts, 02138 (United States)
  2. Department of Physics, University of California, Santa Barbara, California, 93106 (United States)
  3. Department of Physics, Yale University, New Haven, Connecticut, 06511 (United States)
  4. Department of Physics, Enrico Fermi Institute, and Kavli Institute for Cosmological Physics, University of Chicago, Chicago, Illinois, 60637 (United States)
Publication Date:
OSTI Identifier:
21607792
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.84.074034; (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; CORRELATIONS; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; LEPTONS; POLARIZATION; SPIN; ACCELERATORS; ANGULAR MOMENTUM; CYCLIC ACCELERATORS; ELEMENTARY PARTICLES; FERMIONS; MEASURING INSTRUMENTS; PARTICLE PROPERTIES; RADIATION DETECTORS; STORAGE RINGS; SYNCHROTRONS

Citation Formats

Krohn, David, Liu Tao, Shelton, Jessie, and Wang, Lian-Tao. Polarized view of the top asymmetry. United States: N. p., 2011. Web. doi:10.1103/PHYSREVD.84.074034.
Krohn, David, Liu Tao, Shelton, Jessie, & Wang, Lian-Tao. Polarized view of the top asymmetry. United States. doi:10.1103/PHYSREVD.84.074034.
Krohn, David, Liu Tao, Shelton, Jessie, and Wang, Lian-Tao. Sat . "Polarized view of the top asymmetry". United States. doi:10.1103/PHYSREVD.84.074034.
@article{osti_21607792,
title = {Polarized view of the top asymmetry},
author = {Krohn, David and Liu Tao and Shelton, Jessie and Wang, Lian-Tao},
abstractNote = {Recent experimental results from the CDF collaboration which study the top forward-backward asymmetry have strengthened the case that new physics is playing a role in tt production. Here, we propose a set of measurements, built from the charged lepton kinematics in semileptonic and fully leptonic tt events, designed to further probe the underlying causes of this asymmetry both at the Tevatron and at the LHC. Using a set of conservative reference models, we find that measurements of the charged lepton asymmetry, top polarization, and tt spin correlation can establish the existence of new physics and distinguish between competing models both at the Tevatron and the LHC. At the Tevatron, discrimination between models is possible at the 3{sigma} level. At the LHC, we demonstrate that a top forward-backward asymmetry can be established at > or approx. 3{sigma} in the first {approx}5 fb{sup -1} of data and show how competing explanations can be further disentangled.},
doi = {10.1103/PHYSREVD.84.074034},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 7,
volume = 84,
place = {United States},
year = {2011},
month = {10}
}