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Phys. Rev. D 80, 075007 (2009) [22 pages]

LHC signals for warped electroweak charged gauge bosons

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Kaustubh Agashe,¹ Shrihari Gopalakrishna,² Tao Han,³ Gui-Yu Huang,^3,4 and Amarjit Soni²
¹Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, College Park, Maryland 20742, USA
²Brookhaven National Laboratory, Upton, New York 11973, USA
³Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA
⁴Department of Physics, University of California at Davis, Davis, California 95616, USA

Received 20 July 2009; published 7 October 2009

Westudy signals at the LHC for the Kaluza-Klein (KK) excitationsof electroweak charged gauge bosons in the framework of thestandard model (SM) fields propagating in the bulk of awarped extra dimension. Such a scenario can solve both thePlanck-weak and flavor hierarchy problems of the SM. There aretwo such charged states in this scenario with couplings tolight quarks and leptons being suppressed relative to those inthe SM, whereas the couplings to top/bottom quarks are enhanced,similar to the case of electroweak neutral gauge bosons previouslystudied. However, unlike the case of electroweak neutral gauge bosons,there is no irreducible QCD background (including pollution from possiblydegenerate KK gluons) for decays to top+bottom final states sothat this channel is useful for the discovery of thecharged states. Moreover, decays of electroweak charged gauge bosons tolongitudinal W, Z and Higgs are enhanced just as forthe neutral bosons. However, unlike for the neutral gauge bosons,the purely leptonic (and hence clean) decay mode of theWZ is fully reconstructible so that the ratio of thesignal to the SM (electroweak) background can potentially be enhancedby restricting to the resonance region more efficiently. We showthat such final states can give sensitivity to 2(3) TeV masseswith an integrated luminosity of 100(300) fb^-1. We emphasize that improvementsin discriminating a QCD jet from a highly boosted hadronicallydecaying W, and a highly boosted top jet from abottom jet will enhance the reach for these KK particles,and that the signals we study for the warped extradimensional model might actually be applicable also to a widerclass of nonsupersymmetric models of electroweak symmetry breaking.

URL:	http://link.aps.org/doi/10.1103/PhysRevD.80.075007
DOI:	10.1103/PhysRevD.80.075007
PACS:	12.60.Cn; 14.80.Cp 12.60.Cn Extensions of electroweak gauge sector 14.80.Cp Non-standard-model Higgs bosons YEAR: 2009

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Phys. Rev. D 80, 075007 (2009) [22 pages]

LHC signals for warped electroweak charged gauge bosons

REFERENCES (51)

CITING ARTICLES

A new free weekly publication from APS