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Heavy-light decay topologies as a new strategy to discover a heavy gluon

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Abstract

We study the collider phenomenology of the lightest Kaluza-Klein excitation of the gluon, G*, in theories with a warped extra dimension. We do so by means of a two-site effective lagrangian which includes only the lowest-lying spin-1 and spin-1/2 resonances. We point out the importance of the decays of G* to one SM plus one heavy fermion, that were overlooked in the previous literature. It turns out that, when kinematically allowed, such heavy-light decays are powerful channels for discovering the G*. In particular, we present a parton-level Montecarlo analysis of the final state W tb that follows from the decay of G* to one SM top or bottom quark plus its heavy partner. We find that at \( \sqrt {s} = 7\;{\text{TeV}} \) and with 10fb−1 of integrated luminosity, the LHC can discover a KK gluon with mass in the range M G*  = (1.8 − 2.2) TeV if its coupling to a pair of light quarks is \( {g_{{G*q\overline q }}} = \left( {0.2 - 0.5} \right){g_3} \). The same process is also competitive for the discovery of the top and bottom partners as well. We find, for example, that the LHC at \( \sqrt {s} = {7}\;{\text{TeV}} \) can discover a 1 TeV KK bottom quark with an integrated luminosity of (5.3 − 0.61) fb−1 for \( {g_{{G*q\overline q }}} = \left( {0.2 - 0.5} \right){g_3} \).

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Authors and Affiliations

  1. Dipartimento di Fisica, Sapienza Università di Roma and INFN, Piazzale Aldo Moro 5, Roma, Italy

    Cesare Bini, Roberto Contino & Natascia Vignaroli

  2. Department of Physics, Iowa State University, 12 Physics Hall, Ames, IA, 50011, USA

    Natascia Vignaroli

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  1. Cesare Bini
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  2. Roberto Contino
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Correspondence to Roberto Contino.

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Bini, C., Contino, R. & Vignaroli, N. Heavy-light decay topologies as a new strategy to discover a heavy gluon. J. High Energ. Phys. 2012, 157 (2012). https://doi.org/10.1007/JHEP01(2012)157

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