Abstract
We investigate the pair production of a vector-like quark triplet with hypercharge 5/3 decaying into top quark and a complex scalar triplet with hypercharge 1 at the LHC. This novel scenario, featuring particles with exotic charges — two quarks with charge 8/3 and 5/3 and a scalar with charge 2 — serves as a unique window to models based on the framework of partial compositeness, where these particles naturally emerge as bound states around the TeV scale. Leveraging on the LHC data we establish exclusion limits on the masses of the vector-like quark and the scalar triplet. Subsequently, we design an analysis strategy aimed at improving sensitivity in the region which is still allowed. Our analysis focuses on two specific regions in the parameter space: the first entails a large mass gap between the vector-like quarks and the scalars, so that the vector-like quarks can decay into the scalars; the second involves a small mass gap, such that this decay is forbidden. To simplify the parameter space, both vector-like quarks and scalars are assumed to be degenerate or almost degenerate within the triplets, such that chain decays between fermions and scalars are suppressed. As a result, we found that final states characterized by a same-sign lepton pair, multiple jets, and high net transverse momentum (i.e. effective mass) will play a pivotal role to unveil this model and, more in general, models characterised by multiple vector-like quarks around the same mass scale during the high luminosity LHC phase.
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Acknowledgments
The authors thank Rikard Enberg and Gabriele Ferretti for collaboration during the initial stages of the work. The work is supported by the Knut and Alice Wallenberg foundation (Grant KAW 2017.0100, SHIFT project). LP’s work is supported by ICSC – Centro Nazionale di Ricerca in High Performance Computing, Big Data and Quantum Computing, funded by European Union – NextGenerationEU. LP acknowledges the use of the IRIDIS HPC Facility at the University of Southampton.
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Banerjee, A., Ellajosyula, V. & Panizzi, L. Heavy vector-like quarks decaying to exotic scalars: a case study with triplets. J. High Energ. Phys. 2024, 187 (2024). https://doi.org/10.1007/JHEP01(2024)187
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DOI: https://doi.org/10.1007/JHEP01(2024)187