Improved search for two body muon decay ${\ensuremath{\mu}}^{+}\ensuremath{\rightarrow}{e}^{+}{X}_{H}$

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Improved search for two body muon decay $μ^{+} \to e^{+} X_{H}$

A. Aguilar-Arevalo, M. Aoki, M. Blecher, D. I. Britton, D. vom Bruch, D. A. Bryman, S. Chen, J. Comfort, S. Cuen-Rochin, L. Doria, P. Gumplinger, A. Hussein, Y. Igarashi, S. Ito, S. Kettell, L. Kurchaninov, L. S. Littenberg, C. Malbrunot, R. E. Mischke, T. Numao, D. Protopopescu, A. Sher, T. Sullivan, and D. Vavilov (The PIENU Collaboration)

Phys. Rev. D 101, 052014 – Published 31 March 2020

Abstract

Charged lepton flavor violating muon decay $μ^{+} \to e^{+} X_{H}$ , where $X_{H}$ is a massive neutral boson, was sought by searching for extra peaks in the muon decay $μ^{+} \to e^{+} ν \bar{ν}$ energy spectrum in the $m_{X_{H}}$ mass region $47.8 - 95.1 MeV / c^{2}$ . No signal was found and 90% confidence level upper limits were set on the branching ratio $Γ (μ^{+} \to e^{+} X_{H}) / Γ (μ^{+} \to e^{+} ν \bar{ν})$ at the level of $10^{- 5}$ for this region.

Received 23 February 2020
Accepted 16 March 2020

DOI:https://doi.org/10.1103/PhysRevD.101.052014

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.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Flavor changing neutral currents Particle decays

Muons Pions Weakly interacting massive particles

Particles & Fields

Authors & Affiliations

A. Aguilar-Arevalo¹, M. Aoki², M. Blecher³, D. I. Britton⁴, D. vom Bruch^5,‡, D. A. Bryman^5,6,*, S. Chen⁷, J. Comfort⁸, S. Cuen-Rochin^6,9, L. Doria^6,10, P. Gumplinger⁶, A. Hussein^6,11, Y. Igarashi¹², S. Ito ^2,†,§, S. Kettell¹³, L. Kurchaninov⁶, L. S. Littenberg¹³, C. Malbrunot^5,∥, R. E. Mischke⁶, T. Numao⁶, D. Protopopescu⁴, A. Sher⁶, T. Sullivan^5,¶, and D. Vavilov^5,6 (The PIENU Collaboration)

¹Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, CDMX 04510, México
²Physics Department, Osaka University, Toyonaka, Osaka 560-0043, Japan
³Virginia Tech., Blacksburg, Virginia 24061, USA
⁴SUPA—School of Physics and Astronomy, University of Glasgow, Glasgow G12-8QQ, United Kingdom
⁵Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
⁶TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
⁷Department of Engineering Physics, Tsinghua University, Beijing 100084, China
⁸Physics Department, Arizona State University, Tempe, Arizona 85287, USA
⁹Universidad Autónoma de Sinaloa, Culiacán, México
¹⁰PRISMA+ Cluster of Excellence and Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Johann-Joachim-Becher-Weg 45, D 55128 Mainz, Germany
¹¹University of Northern British Columbia, Prince George, British Columbia V2N 4Z9, Canada
¹²KEK, 1-1 Oho, Tsukuba-shi, Ibaraki 300-3256, Japan
¹³Brookhaven National Laboratory, Upton, New York 11973-5000, USA

^*Corresponding author. doug@triumf.ca
^†Corresponding author. s-ito@okayama-u.ac.jp
^‡Present address: LPNHE, Sorbonne Université, Université Paris Diderot, CNRS/IN2P3, Paris, France.
^§Present address: Faculty of Science, Okayama University, Okayama, 700-8530, Japan.
^∥Present address: Experimental Physics Department, CERN, Genève 23, CH-1211, Switzerland.
^¶Present address: Department of Physics, University of Victoria, Victoria, BC V8P 5C2, Canada.

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Vol. 101, Iss. 5 — 1 March 2020

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Physical Review D

covering particles, fields, gravitation, and cosmology

Improved search for two body muon decay $μ^{+} \to e^{+} X_{H}$

Phys. Rev. D 101, 052014 – Published 31 March 2020

Abstract

Physics Subject Headings (PhySH)

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Article Text

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Issue

Physical Review D

covering particles, fields, gravitation, and cosmology

Improved search for two body muon decay μ+→e+XH

Phys. Rev. D 101, 052014 – Published 31 March 2020

Abstract

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Improved search for two body muon decay $μ^{+} \to e^{+} X_{H}$