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Title: Collider implications of a nonuniversal Higgs boson

Abstract

We consider in detail the possibility that the Higgs is wholly or partially excluded from propagating into one otherwise universal extra dimension. This exclusion of the Higgs from propagating into an otherwise universal extra dimension violates tree-level Kaluza-Klein number conservation in the Yukawa interactions. As a consequence, there is inter-mode mixing between fermions. For example, zero-mode fermions mix with their associated Kaluza-Klein excitations. This is in contrast to the original universal extra dimensions scenario, in which conservation of Kaluza-Klein number prohibits such inter-mode mixing. Inter-mode mixing is especially significant for the top quark, since its mass (171.4{+-}2.1 GeV) is approximately one-half the current Tevatron mass bound ({approx}350-400 GeV) for Kaluza-Klein excitations of quarks propagating into universal extra dimensions. We compute the effects that mixing among the zero-modes and lowest-lying Kaluza-Klein excitations has on the lightest third-generation charge 2/3 quark mass eigenvalue in the nonuniversal Higgs model with one otherwise universal extra dimension. Another consequence of the inter-mode mixing is that the Kaluza-Klein excitations of the fermions can decay to a zero-mode Higgs and a corresponding zero-mode fermion. As a result, the pair production of Kaluza-Klein excitations of the top quark would lead to two zero-mode Higgs bosons plus a zero-modemore » top quark/antiquark pair. We compute the cross section that the nonuniversal Higgs model contributes to Higgs production at the Large Hadron Collider. The effect is quite large: For example, the Kaluza-Klein contribution to Higgs production is comparable to or larger than the Standard Model contribution, depending on the Higgs mass, for compactification scales up to about 600 GeV.« less

Authors:
 [1];  [2]
  1. Department of Physics, Louisiana School for Math, Science, and the Arts, Natchitoches, Louisiana 71457 (United States)
  2. Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078 (United States)
Publication Date:
OSTI Identifier:
21020502
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.75.095001; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CERN LHC; COMPACTIFICATION; CROSS SECTIONS; EXCITATION; FERMILAB TEVATRON; GEV RANGE; HIGGS BOSONS; HIGGS MODEL; KALUZA-KLEIN THEORY; MANY-DIMENSIONAL CALCULATIONS; PAIR PRODUCTION; PARTICLE DECAY; REST MASS; STANDARD MODEL; T QUARKS

Citation Formats

McMullen, C. D., and Nandi, S. Collider implications of a nonuniversal Higgs boson. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.095001.
McMullen, C. D., & Nandi, S. Collider implications of a nonuniversal Higgs boson. United States. doi:10.1103/PHYSREVD.75.095001.
McMullen, C. D., and Nandi, S. Tue . "Collider implications of a nonuniversal Higgs boson". United States. doi:10.1103/PHYSREVD.75.095001.
@article{osti_21020502,
title = {Collider implications of a nonuniversal Higgs boson},
author = {McMullen, C. D. and Nandi, S.},
abstractNote = {We consider in detail the possibility that the Higgs is wholly or partially excluded from propagating into one otherwise universal extra dimension. This exclusion of the Higgs from propagating into an otherwise universal extra dimension violates tree-level Kaluza-Klein number conservation in the Yukawa interactions. As a consequence, there is inter-mode mixing between fermions. For example, zero-mode fermions mix with their associated Kaluza-Klein excitations. This is in contrast to the original universal extra dimensions scenario, in which conservation of Kaluza-Klein number prohibits such inter-mode mixing. Inter-mode mixing is especially significant for the top quark, since its mass (171.4{+-}2.1 GeV) is approximately one-half the current Tevatron mass bound ({approx}350-400 GeV) for Kaluza-Klein excitations of quarks propagating into universal extra dimensions. We compute the effects that mixing among the zero-modes and lowest-lying Kaluza-Klein excitations has on the lightest third-generation charge 2/3 quark mass eigenvalue in the nonuniversal Higgs model with one otherwise universal extra dimension. Another consequence of the inter-mode mixing is that the Kaluza-Klein excitations of the fermions can decay to a zero-mode Higgs and a corresponding zero-mode fermion. As a result, the pair production of Kaluza-Klein excitations of the top quark would lead to two zero-mode Higgs bosons plus a zero-mode top quark/antiquark pair. We compute the cross section that the nonuniversal Higgs model contributes to Higgs production at the Large Hadron Collider. The effect is quite large: For example, the Kaluza-Klein contribution to Higgs production is comparable to or larger than the Standard Model contribution, depending on the Higgs mass, for compactification scales up to about 600 GeV.},
doi = {10.1103/PHYSREVD.75.095001},
journal = {Physical Review. D, Particles Fields},
number = 9,
volume = 75,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}
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