Discovery prospects of a vectorlike top partner decaying to a singlet boson

Bhardwaj, A., Bhide, K., Mandal, T., Mitra, S. and Neeraj, C. (2022) Discovery prospects of a vectorlike top partner decaying to a singlet boson. Physical Review D, 106(7), 075024. (doi: 10.1103/PhysRevD.106.075024)

Abstract

The possibility of a vectorlike top partner decaying to a new colorless weak-singlet scalar or pseudoscalar has attracted some attention in the literature. We investigate the production of a weak-singlet charge- 2 / 3 T quark that can decay to a spinless boson ( Φ ) and a top quark at the LHC. Earlier [A. Bhardwaj et al., Roadmap to explore vectorlike quarks decaying to a new scalar or pseudoscalar, arXiv:2203.13753.], we showed that in a large part of the parameter space, the T → t Φ and the loop-induced Φ → g g decays become the dominant decay modes for these particles. Here, we investigate the discovery prospects of the T quark in this region through the above decays. In particular, we focus on the p p → T T → ( t Φ ) ( t Φ ) → ( t ( g g ) ) ( t ( g g ) ) channel. Separating this signal from the huge Standard Model background is a challenging task, forcing us to employ a multivariate machine-learning technique. We find that the above channel can be a discovery channel of the top partner in the large part of the parameter space where the above decay chain dominates. Our analysis is largely model independent, and hence our results would be useful in a broad class of new physics models.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Bhardwaj, Dr Akanksha
• Authors: Bhardwaj, A., Bhide, K., Mandal, T., Mitra, S., and Neeraj, C.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review D
• Publisher: American Physical Society
• ISSN: 2470-0010
• ISSN (Online): 2470-0029
• Published Online: 24 October 2022
• Copyright Holders: Copyright © 2022 American Physical Society
• First Published: First published in Physical Review D 106(7): 075024
• Publisher Policy: Reproduced under a Creative Commons License

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
306883		Research in Particle Physics Theory - Phenomenology from lattice QCD and collider physics	Christine Davies	Science and Technology Facilities Council (STFC)	ST/T000945/1	P&S - Physics & Astronomy