Signatures of vector-like top partners decaying into new neutral scalar or pseudoscalar bosons
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Springer
Received: July 31, Revised: February 14, Accepted: April 15, Published: May 7,
2019 2020 2020 2020
R. Benbrik,a E. Bergeaas Kuutmann,b D. Buarque Franzosi,c V. Ellajosyula,b R. Enberg,b G. Ferretti,c M. Isacson,b Y.-B. Liu,d,1 T. Mandal,b T. Mathisen,b S. Morettie,2 and L. Panizzib,1 a
Laboratoire de Physique Fondamentale et Appliqu´ee Safi, Facult´e Polydisciplinaire de Safi, Universit´e Cadi Ayyad, Sidi Bouzid, P.O.B. 4162, Safi, Maroc b Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden c Department of Physics, Chalmers University of Technology, Fysikg˚ arden 1, 412 96, G¨ oteborg, Sweden d Henan Institute of Science and Technology, Xinxiang 453003, People’s Republic of China e School of Physics & Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, U.K.
E-mail: [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected]
1 2
Also at University of Southampton, Southampton, U.K. Also at Uppsala University, Uppsala, Sweden.
c The Authors. Open Access, Article funded by SCOAP3 .
https://doi.org/10.1007/JHEP05(2020)028
JHEP05(2020)028
Signatures of vector-like top partners decaying into new neutral scalar or pseudoscalar bosons
Keywords: Beyond Standard Model, Heavy Quark Physics, Technicolor and Composite Models, Higgs Physics ArXiv ePrint: 1907.05929
JHEP05(2020)028
Abstract: We explore the phenomenology of models containing one Vector-Like Quark (VLQ), t0 , which can decay into the Standard Model (SM) top quark, t, and a new spin-0 neutral boson, S, the latter being either a scalar or pseudoscalar state. We parametrise the underlying interactions in terms of a simplified model which enables us to capture possible Beyond the SM (BSM) scenarios. We discuss in particular three such scenarios: one where the SM state is supplemented by an additional scalar, one which builds upon a 2-Higgs Doublet Model (2HDM) framework and another which realises a Composite Higgs Model (CHM) through partial compositeness. Such exotic decays of the t0 can be competitive with decays into SM particles, leading to new possible discovery channels at the Large Hadron Collider (LHC). Assuming t0 pair production via strong interactions, we design signal regions optimised for one t0 → S t transition (while being inclusive on the other t¯0 decay, and vice versa), followed by the decay of S into the two very clean experimental signatures S → γ γ and S → Z(→ `+ `− )γ. We perform a dedicated signalto-background analysis in both channels, by using Monte Carlo (MC) event simulations modelling the dynamics from the proton-proton to the detector level. Under the assumption of BR(t0 → S t) = 100%, we are therefore able to realistically quantify the sensitivity of the LHC to both the t0 and S masses, ass
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