Isolating semi-leptonic H → WW∗ decays for Bell inequality tests

Fabbri, F., Howarth, J. and Maurin, T. (2024) Isolating semi-leptonic H → WW∗ decays for Bell inequality tests. European Physical Journal C, 84(1), 20. (doi: 10.1140/epjc/s10052-023-12371-4)

Abstract

We present a method for identifying H→WW∗→ℓνjj events in the presence of large Standard Model backgrounds and illustrate how this decay mode may be applied to the study of Bell-type Inequalities. Our findings reveal the feasibility of complete reconstruction of such Higgs decays and the efficacy of our suggested combination of selection criteria in effectively mitigating the otherwise overwhelming backgrounds. Our approach is based on a combination of bottom and charm tagging, alongside innovative reconstruction techniques. A realistic simulation based on publicly available object identification, reconstruction, and tagging efficiencies from the ATLAS experiment is used to explore the potential sensitivity to violations of the Collins-Gisin-Linden-Massar-Popescu (CGLMP) inequality in existing and expected future data collected at the Large Hadron Collider (LHC). It is found that, the proposed method provides a powerful means of distinguishing the Higgs decay mode from the background, allowing us to achieve an expectation of approximately 3σ significance in detecting violations of these inequalities with 300 fb-1 of data, soon-to-be collected by the LHC.

• Item Type: Articles
• Additional Information: Funding was provided by Royal Society (URFR1191524). Open access funded by SCOAP³.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Fabbri, Dr Federica and Maurin, Mr Theo and Howarth, Dr James
• Authors: Fabbri, F., Howarth, J., and Maurin, T.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: European Physical Journal C
• Publisher: Springer
• ISSN: 1434-6044
• ISSN (Online): 1434-6052
• Published Online: 09 January 2024
• Copyright Holders: Copyright © 2024 The Authors
• First Published: First published in European Physical Journal C 84(1):20
• Publisher Policy: Reproduced under a Creative Commons License