KK-number non-conserving decays: Signal of n=2 excitations of extra-dimensional models at the LHC

In the simplest universal extra-dimensional models Kaluza–Klein (KK) parity distinguishes the states with odd and even KK-number. We calculate the coupling of a 2n-level top quark to a top quark and the Higgs scalar (both n=0 states), absent at the tree level, which is mediated by strong interaction...

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Bibliographic Details
Published in:Nuclear physics. B 2015-04, Vol.893, p.408-419
Main Authors: Dey, Ujjal Kumar, Raychaudhuri, Amitava
Format: Article
Language:English
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Summary:In the simplest universal extra-dimensional models Kaluza–Klein (KK) parity distinguishes the states with odd and even KK-number. We calculate the coupling of a 2n-level top quark to a top quark and the Higgs scalar (both n=0 states), absent at the tree level, which is mediated by strong interactions at one-loop. We show that the strength of this coupling is independent of n. We observe that the decay due to this coupling, which conserves KK-parity, can be a few per cent of the phase space suppressed decay to two n-level states which proceeds through tree-level couplings. We explore the prospects of verification of this result at the Large Hadron Collider through the production of a second-level KK top–antitop pair both of which subsequently decay to a zero mode top quark/antiquark and a Higgs boson.
ISSN:0550-3213
1873-1562
DOI:10.1016/j.nuclphysb.2015.02.007