High energy spectrum of internal positrons from radiative muon capture on nuclei

Ryan Plestid; Richard J. Hill

doi:10.1103/PhysRevD.103.033002

High energy spectrum of internal positrons from radiative muon capture on nuclei

Ryan Plestid, Richard J. Hill

Physics And Astronomy

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

The Mu2e and COMET collaborations will search for nucleus-catalyzed muon conversion to positrons (μ-→e+) as a signal of lepton number violation. A key background for this search is radiative muon capture where either (1) a real photon converts to an e+e- pair "externally"in surrounding material, or (2) a virtual photon mediates the production of an e+e- pair "internally."If the e+ has an energy approaching the signal region then it can serve as an irreducible background. In this work we describe how the near end point internal positron spectrum can be related to the real photon spectrum from the same nucleus, which encodes all nontrivial nuclear physics.

Original language	English
Article number	033002
Journal	Physical Review D
Volume	103
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevD.103.033002
State	Published - Feb 15 2021

Bibliographical note

Funding Information:
We are indebted to Robert Bernstein, Michael Mackenzie, Pavel Murat, and Stefano Di Falco for their consistent availability, enthusiasm, and willingness to help us understand the details and needs of the Mu2e experiment. We especially thank Pavel Murat for emphasizing the importance of the internal positron spectrum and for the existing gap in the literature surrounding its near end point behavior. This work was made possible by the Intensity Frontier Fellowship program which supported R. P.’s visit to Fermilab. R. P. is extremely grateful for the support and hospitality of the Fermilab theory group. This work was supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under Award No. DE-SC0019095. This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.

Publisher Copyright:
© 2021 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"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.

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1103/PhysRevD.103.033002

Cite this

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High energy spectrum of internal positrons from radiative muon capture on nuclei

Abstract

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