Searching for lepton flavor violating interactions at future electron-positron colliders

Lepton flavor violating interactions are absent in the standard model but are expected in various beyond standard models. In this work, the potential of the future circular electron-positron collider to probe the four fermion lepton flavor couplings via the \(e^{+}e^{-}\rightarrow e^{\pm}\tau^{\mp}\...

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Bibliographic Details
Published in:arXiv.org 2021-08
Main Authors: Etesami, S M, Jafari, R, M Mohammadi Najafabadi, Tizchang, S
Format: Article
Language:English
Subjects:
Couplings
Electron-positron accelerators
Electrons
Fermions
Field theory
Flavor (particle physics)
Leptons
Online Access:Get full text
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Summary:Lepton flavor violating interactions are absent in the standard model but are expected in various beyond standard models. In this work, the potential of the future circular electron-positron collider to probe the four fermion lepton flavor couplings via the \(e^{+}e^{-}\rightarrow e^{\pm}\tau^{\mp}\) process is revisited by means of an effective field theory approach. We provide constraints at \(95\%\) CL on the dimension-six Wilson coefficients including major sources of background processes and considering realistic detector effects at four expected operation energies \(\sqrt{s}=157.5\), \(162.5\), \(240\) and \(365\) GeV according to their corresponding integrated luminosities. We demonstrate that statistical combination of the results from four center-of-mass energies improves the sensitivity to the LFV couplings significantly. We compare the results with the prospects from Belle II with \(50~ ab^{-1}\) and other studies at electron-positron colliders.
ISSN:2331-8422
DOI:10.48550/arxiv.2107.00545