Implications of the muon anomalous magnetic moment for the LHC and MUonE

Akanksha Bhardwaj (School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom) ; Christoph Englert (School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom) ; Panagiotis Stylianou (School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom)

We consider the anomalous magnetic moment of the muon aμ, which shows a significant deviation from the Standard Model expectation given the recent measurements at Fermilab and Brookhaven National Lab (BNL). We focus on Standard Model effective field theory (SMEFT) with the aim to identify avenues for the upcoming LHC runs and future experiments such as MUonE. To this end, we include radiative effects to aμ in SMEFT to connect the muon anomaly to potentially interesting searches at the LHC, specifically Higgs decays into muon pairs and such decays with resolved photons. Our investigation shows that, similar to results for concrete UV extensions of the Standard Model, the Fermilab/BNL result can indicate strong coupling within the EFT framework and aμ is increasingly sensitive to a single operator direction for high scale UV completions. In such cases, there is some complementarity between expected future experimental improvements, yet with considerable statistical challenges to match the precision provided by the recent aμ measurement.

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      "value": "We consider the anomalous magnetic moment of the muon <math><msub><mi>a</mi><mi>\u03bc</mi></msub></math>, which shows a significant deviation from the Standard Model expectation given the recent measurements at Fermilab and Brookhaven National Lab (BNL). We focus on Standard Model effective field theory (SMEFT) with the aim to identify avenues for the upcoming LHC runs and future experiments such as MUonE. To this end, we include radiative effects to <math><msub><mi>a</mi><mi>\u03bc</mi></msub></math> in SMEFT to connect the muon anomaly to potentially interesting searches at the LHC, specifically Higgs decays into muon pairs and such decays with resolved photons. Our investigation shows that, similar to results for concrete UV extensions of the Standard Model, the Fermilab/BNL result can indicate strong coupling within the EFT framework and <math><msub><mi>a</mi><mi>\u03bc</mi></msub></math> is increasingly sensitive to a single operator direction for high scale UV completions. In such cases, there is some complementarity between expected future experimental improvements, yet with considerable statistical challenges to match the precision provided by the recent <math><msub><mi>a</mi><mi>\u03bc</mi></msub></math> measurement."
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Published on:
31 October 2022
Publisher:
APS
Published in:
Physical Review D , Volume 106 (2022)
Issue 7
DOI:
https://doi.org/10.1103/PhysRevD.106.075031
arXiv:
2206.14640
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

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