TY - JOUR
T1 - Searching for new physics at μ →e facilities with μ+ and π+ decays at rest
AU - Hill, Richard J.
AU - Plestid, Ryan
AU - Zupan, Jure
N1 - Publisher Copyright:
© 2024 authors. Published by the American Physical Society.
PY - 2024/2/1
Y1 - 2024/2/1
N2 - We investigate the ability of μ→e facilities, Mu2e and COMET, to probe, or discover, new physics with their detector validation datasets. The validation of the detector response may be performed using a dedicated run with μ+, collecting data below the Michel edge, Ee≲52 MeV; an alternative strategy using π+→e+νe may also be considered. We focus primarily on a search for a monoenergetic e+ produced via two-body decays μ+→e+X or π+→e+X, with X a light new physics particle. Mu2e can potentially explore new parameter space beyond present astrophysical and laboratory constraints for a set of well motivated models including axionlike particles with flavor violating couplings (μ+→e+a), massive Z′ bosons (μ+→Z′e+), and heavy neutral leptons (π+→e+N). The projected sensitivities presented herein can be achieved in a matter of days.
AB - We investigate the ability of μ→e facilities, Mu2e and COMET, to probe, or discover, new physics with their detector validation datasets. The validation of the detector response may be performed using a dedicated run with μ+, collecting data below the Michel edge, Ee≲52 MeV; an alternative strategy using π+→e+νe may also be considered. We focus primarily on a search for a monoenergetic e+ produced via two-body decays μ+→e+X or π+→e+X, with X a light new physics particle. Mu2e can potentially explore new parameter space beyond present astrophysical and laboratory constraints for a set of well motivated models including axionlike particles with flavor violating couplings (μ+→e+a), massive Z′ bosons (μ+→Z′e+), and heavy neutral leptons (π+→e+N). The projected sensitivities presented herein can be achieved in a matter of days.
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U2 - 10.1103/PhysRevD.109.035025
DO - 10.1103/PhysRevD.109.035025
M3 - Article
AN - SCOPUS:85188212100
SN - 2470-0010
VL - 109
JO - Physical Review D
JF - Physical Review D
IS - 3
M1 - 035025
ER -