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Next-to-leading order scalar contributions to μ → e conversion

Cirigliano, Vincenzo and Fuyuto, Kaori and Ramsey-Musolf, Michael J. and Rule, Evan (2022) Next-to-leading order scalar contributions to μ → e conversion. Physical Review C, 105 (5). Art. No. 055504. ISSN 2469-9985. doi:10.1103/physrevc.105.055504.

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Within a class of models in which lepton flavor violation is induced dominantly by scalar particle exchanges, we estimate the μ → e conversion rate in several nuclei. We include next-to-leading order (NLO) terms in the one- and two-nucleon interactions in chiral effective theory, rectifying some incorrect results in the previous literature. We provide an uncertainty budget for the conversion rates and we find that NLO contributions affect the amplitudes at the level of 10%, which could be larger than the uncertainty on the leading order couplings, dominated by the strange and nonstrange nucleon sigma terms. We study the implications of our results for testing Higgs-mediated charged lepton flavor violation (CLFV) in the future by combining results from various experimental searches, such as μ → e conversion in multiple target nuclei and μ → eγ.

Item Type:Article
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URLURL TypeDescription Paper
Cirigliano, Vincenzo0000-0002-9056-754X
Fuyuto, Kaori0000-0002-6924-0665
Ramsey-Musolf, Michael J.0000-0001-8110-2479
Rule, Evan0000-0003-1316-0970
Additional Information:© 2022 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3. (Received 4 April 2022; accepted 3 May 2022; published 23 May 2022) We are grateful to Anothony Bartolotta, Richard Silbar, Terry Goldman, Anna Hayes-Sterbenz, Emanuele Mereghetti, Martin Hoferichter, Frederic Noel, and Javier Menéndez for valuable discussions. M.J.R.-M. is supported in part under U.S. Department of Energy Contract No. DE-SC0011095. M.J.R.-M. was also supported in part under National Science Foundation of China Grant No. 19Z103010239. E.R. is supported in part by the U.S. Department of Energy under Grants No. DE-SC0004658, No. DE-FOA-0001269 and No. FWP-NQISCCAWL. V.C. and K.F. were supported by the U.S. Department of Energy through the Los Alamos National Laboratory. K.F. is also supported by the LANL LDRD Program. Los Alamos National Laboratory is operated by Triad National Security, LLC, for the National Nuclear Security Administration of U.S. Department of Energy (Contract No. 89233218CNA000001).
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0011095
National Natural Science Foundation of China19Z103010239
Department of Energy (DOE)DE-SC0004658
Department of Energy (DOE)DE-FOA-0001269
Department of Energy (DOE)FWP-NQISCCAWL
Los Alamos National LaboratoryUNSPECIFIED
Department of Energy (DOE)89233218CNA000001
Issue or Number:5
Record Number:CaltechAUTHORS:20220601-257351000
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:114976
Deposited By: George Porter
Deposited On:02 Jun 2022 20:42
Last Modified:02 Jun 2022 20:42

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