Di-boson signatures as standard candles for partial compositeness

Belyaev, Alexander (School of Physics & Astronomy, University of Southampton, Southampton, U.K.) (Particle Physics Department, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K.) ; Cacciapaglia, Giacomo (Univerity of Lyon, Université Lyon 1, CNRS/IN2P3, IPNL, F-69622, Villeurbanne, France) ; Cai, Haiying (Univerity of Lyon, Université Lyon 1, CNRS/IN2P3, IPNL, F-69622, Villeurbanne, France) ; Ferretti, Gabriele (Department of Physics, Chalmers University of Technology, Fysikgården, 41296, Göteborg, Sweden) ; Flacke, Thomas (Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS), Daejeon, 34051, Korea) (Department of Physics, Korea University, Seoul, 136-713, Korea) ; Parolini, Alberto (Department of Physics, Korea University, Seoul, 136-713, Korea) ; Serodio, Hugo (Department of Physics, Korea University, Seoul, 136-713, Korea) (Department of Astronomy and Theoretical Physics, Lund University, SE-223 62, Lund, Sweden)

24 January 2017

Abstract: Composite Higgs Models are often constructed including fermionic top partners with a mass around the TeV scale, with the top partners playing the role of stabilizing the Higgs potential and enforcing partial compositeness for the top quark. A class of models of this kind can be formulated in terms of fermionic strongly coupled gauge theories. A common feature they all share is the presence of specific additional scalar resonances, namely two neutral singlets and a colored octet, described by a simple effective Lagrangian. We study the phenomenology of these scalars, both in a model independent and model dependent way, including the bounds from all the available searches in the relevant channels with di-boson and di-top final states. We develop a generic framework which can be used to constrain any model containing pseudo-scalar singlets or octets. Using it, we find that such signatures provide strong bounds on the compositeness scale complementary to the traditional EWPT and Higgs couplings deviations. In many cases a relatively light scalar can be on the verge of discovery as a first sign of new physics.


Published in: JHEP 1701 (2017) 094
Published by: Springer/SISSA
DOI: 10.1007/JHEP01(2017)094
arXiv: 1610.06591
License: CC-BY-4.0



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