Difference between two species of emu hides a test for lepton flavour violation
Publication Date
2017-03-28Journal Title
Journal of High Energy Physics
ISSN
1126-6708
Publisher
Springer
Volume
2017
Issue
3
Number
149
Language
English
Type
Article
This Version
VoR
Metadata
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Lester, C., & Brunt, B. (2017). Difference between two species of emu hides a test for lepton flavour violation. Journal of High Energy Physics, 2017 (3. 149)https://doi.org/10.1007/JHEP03(2017)149
Abstract
We argue that an LHC measurement of some simple quantities related to the ratio of rates of e$^{+}$μ$^{-}$ to e$^{-}$μ$^{+}$ events is surprisingly sensitive to as-yet unexcluded R-parity violating supersymmetric models with non-zero λ′$_{231}$ couplings. The search relies upon the approximate lepton universality in the Standard Model, the sign of the charge of the proton, and a collection of favourable detector biases. The proposed search is unusual because: it does not require any of the displaced vertices, hadronic neutralino decay products, or squark/gluino production relied upon by existing LHC RPV searches; it could work in cases in which the only light sparticles were smuons and neutralinos; and it could make a discovery (though not necessarily with optimal significance) without requiring the computation of a leading-order Monte Carlo estimate of any background rate. The LHC has shown no strong hints of post-Higgs physics and so precision Standard Model measurements are becoming ever more important. We argue that in this environment growing profits are to be made from searches that place detector biases and symmetries of the Standard Model at their core — searches based around ‘controls’ rather than around signals.
Sponsorship
The authors gratefully acknowledge the United Kingdom's Science and Technology Facilities Research Council (STFC) and Peterhouse for financial support.
Embargo Lift Date
2100-01-01
Identifiers
External DOI: https://doi.org/10.1007/JHEP03(2017)149
This record's URL: https://www.repository.cam.ac.uk/handle/1810/264525
Rights
Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International