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Top quark forward-backward asymmetry from new t-channel physics

Motivated by recent measurements of the top quark forward-backward asymmetry at the Tevatron, we study how t-channel new physics can contribute to a large value. We concentrate on a theory with an abelian gauge boson possessing flavor changing couplings between up and top quarks, but satisfies flavo...

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Detalles Bibliográficos
Autores principales: Jung, Sunghoon, Murayama, Hitoshi, Pierce, Aaron, Wells, James D.
Lenguaje:eng
Publicado: 2009
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.81.015004
http://cds.cern.ch/record/1193003
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author Jung, Sunghoon
Murayama, Hitoshi
Pierce, Aaron
Wells, James D.
author_facet Jung, Sunghoon
Murayama, Hitoshi
Pierce, Aaron
Wells, James D.
author_sort Jung, Sunghoon
collection CERN
description Motivated by recent measurements of the top quark forward-backward asymmetry at the Tevatron, we study how t-channel new physics can contribute to a large value. We concentrate on a theory with an abelian gauge boson possessing flavor changing couplings between up and top quarks, but satisfies flavor physics constraints. Collider constraints are strong, but can be consistent with the aid of small flavor diagonal couplings. We find that M_Z' ~ 160 GeV can yield a total lab-frame asymmetry of ~18% without being in conflict with other observables. There are implications for future collider searches, including exotic top quark decays, like-sign top quark production, and detailed measurements of the top production cross section. An alternate model with a gauged non-Abelian flavor symmetry would have similar phenomenology, but lacks the like-sign top signal.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2009
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spelling cern-11930032022-06-27T02:17:59Zdoi:10.1103/PhysRevD.81.015004http://cds.cern.ch/record/1193003engJung, SunghoonMurayama, HitoshiPierce, AaronWells, James D.Top quark forward-backward asymmetry from new t-channel physicsParticle Physics - PhenomenologyMotivated by recent measurements of the top quark forward-backward asymmetry at the Tevatron, we study how t-channel new physics can contribute to a large value. We concentrate on a theory with an abelian gauge boson possessing flavor changing couplings between up and top quarks, but satisfies flavor physics constraints. Collider constraints are strong, but can be consistent with the aid of small flavor diagonal couplings. We find that M_Z' ~ 160 GeV can yield a total lab-frame asymmetry of ~18% without being in conflict with other observables. There are implications for future collider searches, including exotic top quark decays, like-sign top quark production, and detailed measurements of the top production cross section. An alternate model with a gauged non-Abelian flavor symmetry would have similar phenomenology, but lacks the like-sign top signal.Motivated by recent measurements of the top quark forward-backward asymmetry at the Tevatron, we study how t-channel new physics can contribute to a large value. We concentrate on a theory with an abelian gauge boson possessing flavor changing couplings between up and top quarks, but satisfies flavor physics constraints. Collider constraints are strong, but can be consistent with the aid of small flavor diagonal couplings. We find that M_Z' ~ 160 GeV can yield a total lab-frame asymmetry of ~18% without being in conflict with other observables. There are implications for future collider searches, including exotic top quark decays, like-sign top quark production, and detailed measurements of the top production cross section. An alternate model with a gauged non-Abelian flavor symmetry would have similar phenomenology, but lacks the like-sign top signal.arXiv:0907.4112MCTP-09-35CERN-PH-TH-2009-128IPMU09-008MCTP-09-35CERN-PH-TH-2009-128IPMU09-008oai:cds.cern.ch:11930032009-07-24
spellingShingle Particle Physics - Phenomenology
Jung, Sunghoon
Murayama, Hitoshi
Pierce, Aaron
Wells, James D.
Top quark forward-backward asymmetry from new t-channel physics
title Top quark forward-backward asymmetry from new t-channel physics
title_full Top quark forward-backward asymmetry from new t-channel physics
title_fullStr Top quark forward-backward asymmetry from new t-channel physics
title_full_unstemmed Top quark forward-backward asymmetry from new t-channel physics
title_short Top quark forward-backward asymmetry from new t-channel physics
title_sort top quark forward-backward asymmetry from new t-channel physics
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1103/PhysRevD.81.015004
http://cds.cern.ch/record/1193003
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