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Title: LHC signals for warped electroweak charged gauge bosons

Abstract

We study signals at the LHC for the Kaluza-Klein (KK) excitations of electroweak charged gauge bosons in the framework of the standard model (SM) fields propagating in the bulk of a warped extra dimension. Such a scenario can solve both the Planck-weak and flavor hierarchy problems of the SM. There are two such charged states in this scenario with couplings to light quarks and leptons being suppressed relative to those in the SM, whereas the couplings to top/bottom quarks are enhanced, similar to the case of electroweak neutral gauge bosons previously studied. However, unlike the case of electroweak neutral gauge bosons, there is no irreducible QCD background (including pollution from possibly degenerate KK gluons) for decays to top+bottom final states so that this channel is useful for the discovery of the charged states. Moreover, decays of electroweak charged gauge bosons to longitudinal W, Z and Higgs are enhanced just as for the neutral bosons. However, unlike for the neutral gauge bosons, the purely leptonic (and hence clean) decay mode of the WZ is fully reconstructible so that the ratio of the signal to the SM (electroweak) background can potentially be enhanced by restricting to the resonance region more efficiently. Wemore » show that such final states can give sensitivity to 2(3) TeV masses with an integrated luminosity of 100(300) fb{sup -1}. We emphasize that improvements in discriminating a QCD jet from a highly boosted hadronically decaying W, and a highly boosted top jet from a bottom jet will enhance the reach for these KK particles, and that the signals we study for the warped extra dimensional model might actually be applicable also to a wider class of nonsupersymmetric models of electroweak symmetry breaking.« less

Authors:
 [1]; ;  [2];  [3];  [3]
  1. Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)
  2. Brookhaven National Laboratory, Upton, New York 11973 (United States)
  3. Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)
Publication Date:
OSTI Identifier:
21325267
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 80; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.80.075007; (c) 2009 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; CHARGED PARTICLES; COUPLING; D QUARKS; EXCITATION; FLAVOR MODEL; GLUONS; HIGGS BOSONS; HIGGS MODEL; KALUZA-KLEIN THEORY; LEPTONS; LUMINOSITY; PARTICLE DECAY; QUANTUM CHROMODYNAMICS; SENSITIVITY; STANDARD MODEL; SYMMETRY BREAKING; TEV RANGE 01-10; U QUARKS; WEINBERG-SALAM GAUGE MODEL

Citation Formats

Agashe, Kaustubh, Gopalakrishna, Shrihari, Soni, Amarjit, Tao, Han, Guiyu, Huang, and Department of Physics, University of California at Davis, Davis, California 95616. LHC signals for warped electroweak charged gauge bosons. United States: N. p., 2009. Web. doi:10.1103/PHYSREVD.80.075007.
Agashe, Kaustubh, Gopalakrishna, Shrihari, Soni, Amarjit, Tao, Han, Guiyu, Huang, & Department of Physics, University of California at Davis, Davis, California 95616. LHC signals for warped electroweak charged gauge bosons. United States. doi:10.1103/PHYSREVD.80.075007.
Agashe, Kaustubh, Gopalakrishna, Shrihari, Soni, Amarjit, Tao, Han, Guiyu, Huang, and Department of Physics, University of California at Davis, Davis, California 95616. Thu . "LHC signals for warped electroweak charged gauge bosons". United States. doi:10.1103/PHYSREVD.80.075007.
@article{osti_21325267,
title = {LHC signals for warped electroweak charged gauge bosons},
author = {Agashe, Kaustubh and Gopalakrishna, Shrihari and Soni, Amarjit and Tao, Han and Guiyu, Huang and Department of Physics, University of California at Davis, Davis, California 95616},
abstractNote = {We study signals at the LHC for the Kaluza-Klein (KK) excitations of electroweak charged gauge bosons in the framework of the standard model (SM) fields propagating in the bulk of a warped extra dimension. Such a scenario can solve both the Planck-weak and flavor hierarchy problems of the SM. There are two such charged states in this scenario with couplings to light quarks and leptons being suppressed relative to those in the SM, whereas the couplings to top/bottom quarks are enhanced, similar to the case of electroweak neutral gauge bosons previously studied. However, unlike the case of electroweak neutral gauge bosons, there is no irreducible QCD background (including pollution from possibly degenerate KK gluons) for decays to top+bottom final states so that this channel is useful for the discovery of the charged states. Moreover, decays of electroweak charged gauge bosons to longitudinal W, Z and Higgs are enhanced just as for the neutral bosons. However, unlike for the neutral gauge bosons, the purely leptonic (and hence clean) decay mode of the WZ is fully reconstructible so that the ratio of the signal to the SM (electroweak) background can potentially be enhanced by restricting to the resonance region more efficiently. We show that such final states can give sensitivity to 2(3) TeV masses with an integrated luminosity of 100(300) fb{sup -1}. We emphasize that improvements in discriminating a QCD jet from a highly boosted hadronically decaying W, and a highly boosted top jet from a bottom jet will enhance the reach for these KK particles, and that the signals we study for the warped extra dimensional model might actually be applicable also to a wider class of nonsupersymmetric models of electroweak symmetry breaking.},
doi = {10.1103/PHYSREVD.80.075007},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 7,
volume = 80,
place = {United States},
year = {2009},
month = {10}
}