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Searches for long-lived particles at the future FCC-ee

Verhaaren, C.B.; Alimena, J.; Bauer, M.; Azzi, P.; Ruiz, R.; Neubert, M.; Mikulenko, O.; Ovchynnikov, M.; Drewes, M.; Klaric, J.; Blondel, A.; Rizzi, C.; Sfyrla, A.; Sharma, T.; Kulkarni, S.; Thamm, A.; Suarez, R. Gonzalez; Rygaard, L.

Searches for long-lived particles at the future FCC-ee Thumbnail


Authors

C.B. Verhaaren

J. Alimena

P. Azzi

R. Ruiz

M. Neubert

O. Mikulenko

M. Ovchynnikov

M. Drewes

J. Klaric

A. Blondel

C. Rizzi

A. Sfyrla

T. Sharma

S. Kulkarni

A. Thamm

R. Gonzalez Suarez

L. Rygaard



Abstract

The electron-positron stage of the Future Circular Collider, FCC-ee, is a frontier factory for Higgs, top, electroweak, and flavour physics. It is designed to operate in a 100 km circular tunnel built at CERN, and will serve as the first step towards ≥100 TeV proton-proton collisions. In addition to an essential and unique Higgs program, it offers powerful opportunities to discover direct or indirect evidence of physics beyond the Standard Model. Direct searches for long-lived particles at FCC-ee could be particularly fertile in the high-luminosity Z run, where 5 × 1012 Z bosons are anticipated to be produced for the configuration with two interaction points. The high statistics of Higgs bosons, W bosons and top quarks in very clean experimental conditions could offer additional opportunities at other collision energies. Three physics cases producing long-lived signatures at FCC-ee are highlighted and studied in this paper: heavy neutral leptons (HNLs), axion-like particles (ALPs), and exotic decays of the Higgs boson. These searches motivate out-of-the-box optimization of experimental conditions and analysis techniques, which could lead to improvements in other physics searches.

Journal Article Type Article
Acceptance Date Aug 8, 2022
Online Publication Date Sep 28, 2022
Publication Date Sep 28, 2022
Deposit Date Apr 12, 2023
Publicly Available Date May 31, 2023
Journal Frontiers in Physics
Publisher Frontiers Media
Peer Reviewed Peer Reviewed
Volume 10
Pages 1-25
DOI https://doi.org/10.3389/fphy.2022.967881
Public URL https://durham-repository.worktribe.com/output/1175034

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.






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