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A mechanism for Kaluza–Klein number violation in UED and implications for LHC

C D McMullen1 and S Nandi2

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We extend our previous analysis on a model where the Higgs does not propagate into an otherwise universal extra dimension. Previously, we computed the cross section for the pair production of Kaluza–Klein excitations of the top quark based on mixing in the Yukawa interactions between the zero-mode top quark and its lowest-lying Kaluza–Klein excitations. In this work, we show that there is also violation of tree-level Kaluza–Klein number conservation in the gauge sector. This allows Kaluza–Klein excitations of the fermions to be produced singly, and opens up new decay channels in the gauge sector. Here, we compute the cross section for the production of the lowest-lying Kaluza–Klein excitations of the top and bottom quarks in the non-universal Higgs model at the Large Hadron Collider, and consider their subsequent decays, including effects from mixing in the gauge sector. The effect is quite large: for example, the pair production of Kaluza–Klein excitations of the bottom quark leads to a pair of top quarks plus a pair of charged weak gauge bosons. Since the production is via the strong interaction, such final states stand out well against the Standard Model background, and are observable at the LHC for a wide range of compactification scales.


PACS

13.85.Qk Inclusive production with identified leptons, photons, or other nonhadronic particles

14.65.Ha Top quarks

11.30.Er Charge conjugation, parity, time reversal, and other discrete symmetries

14.65.Fy Bottom quarks

98.80.Cq Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.)

12.10.-g Unified field theories and models

Subjects

Gravitation and cosmology

Particle physics and field theory

Astrophysics and astroparticles

Dates

Issue 9 (September 2008)

Received 16 May 2008

Published 28 July 2008



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