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

Title: CERN LHC signals for warped electroweak neutral gauge bosons

Abstract

We study signals at the Large Hadron Collider (LHC) for Kaluza-Klein (KK) excitations of the electroweak gauge bosons in the framework with the standard model (SM) gauge and fermion fields propagating in a warped extra dimension. Such a framework addresses both the Planck-weak and flavor hierarchy problems of the SM. Unlike the often studied Z{sup '} cases, in this framework, there are three neutral gauge bosons due to the underlying SU(2){sub L}xSU(2){sub R}xU(1){sub X} gauge group in the bulk. Furthermore, couplings of these KK states to light quarks and leptons are suppressed, whereas those to top and bottom quarks are enhanced compared to the SM gauge couplings. Therefore, the production of light quark and lepton states is suppressed relative to other beyond the SM constructions, and the fermionic decays of these states are dominated by the top and bottom quarks, which are, though, overwhelmed by KK gluons dominantly decaying into them. However, as we emphasize in this paper, decays of these states to longitudinal W, Z and Higgs are also enhanced similarly to the case of top and bottom quarks. We show that the W, Z and Higgs final states can give significant sensitivity at the LHC to {approx}2(3) TeVmore » KK scale with an integrated luminosity of {approx}100 fb{sup -1} ({approx}1 ab{sup -1}). Since current theoretical framework(s) favor KK masses > or approx. 3 TeV, a luminosity upgrade of LHC is likely to be crucial in observing these states.« less

Authors:
 [1]; ; ;  [2]; ;  [3];  [4];  [5]
  1. Department of Physics, Syracuse University, Syracuse, New York 13244 (United States)
  2. Brookhaven National Laboratory, Upton, New York 11973 (United States)
  3. Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)
  4. C. N. Yang Institute for Theoretical Physics, State University of New York, Stony Brook, New York 11794-3840 (United States)
  5. Department of Physics, Shandong University, Jinan Shandong 250100 (China)
Publication Date:
OSTI Identifier:
21023959
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 76; Journal Issue: 11; Other Information: DOI: 10.1103/PhysRevD.76.115015; (c) 2007 The American Physical Society; 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; B QUARKS; CERN LHC; D QUARKS; EXCITATION; FLAVOR MODEL; GLUONS; HIGGS BOSONS; HIGGS MODEL; KALUZA-KLEIN THEORY; LEPTONS; STANDARD MODEL; SU-2 GROUPS; T QUARKS; TEV RANGE; U QUARKS; U-1 GROUPS; W MINUS BOSONS; W PLUS BOSONS; Z NEUTRAL BOSONS

Citation Formats

Agashe, Kaustubh, Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, College Park, Maryland 20742, Davoudiasl, Hooman, Gopalakrishna, Shrihari, Soni, Amarjit, Tao, Han, Huang, G -Y, Perez, Gilad, Jefferson Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138, Physics Department, Boston University, Boston, Massachusetts 02215, and Zongguo, Si. CERN LHC signals for warped electroweak neutral gauge bosons. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.76.115015.
Agashe, Kaustubh, Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, College Park, Maryland 20742, Davoudiasl, Hooman, Gopalakrishna, Shrihari, Soni, Amarjit, Tao, Han, Huang, G -Y, Perez, Gilad, Jefferson Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138, Physics Department, Boston University, Boston, Massachusetts 02215, & Zongguo, Si. CERN LHC signals for warped electroweak neutral gauge bosons. United States. doi:10.1103/PHYSREVD.76.115015.
Agashe, Kaustubh, Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, College Park, Maryland 20742, Davoudiasl, Hooman, Gopalakrishna, Shrihari, Soni, Amarjit, Tao, Han, Huang, G -Y, Perez, Gilad, Jefferson Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138, Physics Department, Boston University, Boston, Massachusetts 02215, and Zongguo, Si. Sat . "CERN LHC signals for warped electroweak neutral gauge bosons". United States. doi:10.1103/PHYSREVD.76.115015.
@article{osti_21023959,
title = {CERN LHC signals for warped electroweak neutral gauge bosons},
author = {Agashe, Kaustubh and Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, College Park, Maryland 20742 and Davoudiasl, Hooman and Gopalakrishna, Shrihari and Soni, Amarjit and Tao, Han and Huang, G -Y and Perez, Gilad and Jefferson Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138 and Physics Department, Boston University, Boston, Massachusetts 02215 and Zongguo, Si},
abstractNote = {We study signals at the Large Hadron Collider (LHC) for Kaluza-Klein (KK) excitations of the electroweak gauge bosons in the framework with the standard model (SM) gauge and fermion fields propagating in a warped extra dimension. Such a framework addresses both the Planck-weak and flavor hierarchy problems of the SM. Unlike the often studied Z{sup '} cases, in this framework, there are three neutral gauge bosons due to the underlying SU(2){sub L}xSU(2){sub R}xU(1){sub X} gauge group in the bulk. Furthermore, couplings of these KK states to light quarks and leptons are suppressed, whereas those to top and bottom quarks are enhanced compared to the SM gauge couplings. Therefore, the production of light quark and lepton states is suppressed relative to other beyond the SM constructions, and the fermionic decays of these states are dominated by the top and bottom quarks, which are, though, overwhelmed by KK gluons dominantly decaying into them. However, as we emphasize in this paper, decays of these states to longitudinal W, Z and Higgs are also enhanced similarly to the case of top and bottom quarks. We show that the W, Z and Higgs final states can give significant sensitivity at the LHC to {approx}2(3) TeV KK scale with an integrated luminosity of {approx}100 fb{sup -1} ({approx}1 ab{sup -1}). Since current theoretical framework(s) favor KK masses > or approx. 3 TeV, a luminosity upgrade of LHC is likely to be crucial in observing these states.},
doi = {10.1103/PHYSREVD.76.115015},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 11,
volume = 76,
place = {United States},
year = {2007},
month = {12}
}