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A clean signal for a top-like isosinglet fermion at the Large Hadron Collider

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Abstract

We predict a clean signal at the Large Hadron Collider (\(\sqrt{s}=\) 14 TeV) for a scenario where there is a top-like, charge + 2/3 vector-like isosinglet fermion. Such a quark, via mixing with the standard model top, can undergo decays via both flavour-changing Z-boson coupling and flavour-changing Yukawa interactions. We concentrate on the latter channel, and study the situation where, following its pair production, the heavy quark pair gives rise to two tops and two Higgs bosons. We show that when each Higgs decays in the \(b\bar{b}\) channel, there can be a rather distinct and background-free signal that can unveil the existence of the vector-like isosinglet quark of this kind.

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Acknowledgement

The author is grateful to Prof. Biswarup Mukhopadhyaya for suggesting the problem considered here and for constant support throughout the course of this work and to Prof. Asesh Krishna Datta for useful discussions. The author acknowledges technical help from Satyanarayan Mukhopadhaya and Nishita Desai, help from Sanjoy Biswas in writing the code and Monalisa Patra for pointing out an important fact. The author also appreciates the constant support and encouragement from D S Ramana. This work is supported by a grant (SR/WOS-A/PS-04/2009) from the Department of Science and Technology, Government of India, New Delhi, under the WOS-A scheme and partially by funds available for Regional Centre for Accelerator-based Particle Physics, from the Department of Atomic Energy, Government of India.

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  1. Regional Centre for Accelerator-based Particle Physics, Harish-Chandra Research Institute, Chatnaag Road, Jhunsi, Allahabad, 211 019, India

    AARTI GIRDHAR

  2. Department of Physics, Dr B R Ambedkar National Institute of Technology, Jalandhar, 144 011, India

    AARTI GIRDHAR

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GIRDHAR, A. A clean signal for a top-like isosinglet fermion at the Large Hadron Collider. Pramana - J Phys 81, 975–986 (2013). https://doi.org/10.1007/s12043-013-0618-0

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