CERN LHC signals from warped extra dimensions

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.77.015003· OSTI ID:21035739

Agashe, Kaustubh ^[1]; Belyaev, Alexander ^[2]; Krupovnickas, Tadas ^[3]; Perez, Gilad ^[4]; Virzi, Joseph ^[5]

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1. Department of Physics, Syracuse University, Syracuse, New York 13244 (United States)
2. Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States)
3. Brookhaven National Laboratory, Upton, New York 11973 (United States)
4. C. N. Yang Institute for Theoretical Physics, State University of New York, Stony Brook, New York 11794-3840 (United States)
5. Lawrence Berkeley National Laboratory, Physics Division, 1 Cyclotron Road, Berkeley, California 94720 (United States)

We study production of Kaluza-Klein (KK) gluons at the Large Hadron Collider (LHC) in the framework of a warped extra dimension with the standard model fields propagating in the bulk. We show that the detection of the KK gluon is challenging since its production is suppressed by small couplings to the proton's constituents. Moreover, the KK gluon decays mostly to top pairs due to an enhanced coupling and hence is broad. Nevertheless, we demonstrate that for M{sub KKG} < or approx. 4 TeV, 100 fb{sup -1} of data at the LHC can provide discovery of the KK gluon. We utilize a sizable left-right polarization asymmetry from the KK gluon resonance to maximize the signal significance, and we explore the novel feature of extremely highly energetic 'top-jets'. We briefly discuss how the detection of electroweak gauge KK states (Z/W) faces a similar challenge since their leptonic decays (golden modes) are suppressed. Our analysis suggests that other frameworks, for example, little Higgs, which rely on UV completion via strong dynamics might face similar challenges, namely, (1) suppressed production rates for the new particles (such as Z{sup '}), due to their 'light-fermion-phobic' nature, and (2) difficulties in detection since the new particles are broad and decay predominantly to third generation quarks and longitudinal gauge bosons.

• OSTI ID: 21035739
• Journal Information: Physical Review. D, Particles Fields, Vol. 77, Issue 1; Other Information: DOI: 10.1103/PhysRevD.77.015003; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
CERN LHC
COUPLING
GLUONS
HIGGS BOSONS
HIGGS MODEL
JET MODEL
KALUZA-KLEIN THEORY
LEPTONIC DECAY
PARTICLE IDENTIFICATION
PARTICLE PRODUCTION
POLARIZATION
PROTONS
QUARKS
STANDARD MODEL
TEV RANGE