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Title: Pair production of dark particles in meson decays

Abstract

Rare decays of K and B mesons provide a powerful probe of dark sectors with light new particles. We show that the pair production of O ( 100 MeV ) dark states can be probed with the decays of K L mesons, owing to the enhanced two-body kinematics, K L X 1 X 2 or X 2 X 2 . If either of these two particles is unstable, e.g., X 2 X 1 π 0 , X 2 X 1 γ or X 1 , 2 γ γ , such decays could easily mimic K L π 0 ν ν ¯ signatures, while not being ruled out by the decays of charged kaons. We construct explicit models that have enhanced K L decay signatures, and are constrained by the results of the KOTO experiment. We note that recently reported excess events can also be accommodated while satisfying all other constraints ( B decays, colliders, beam dumps). These models are based on the extensions of the gauge and/or scalar sector of the theory. The lightest of X 1 , 2 particles, if stable, could constitute the entirety of dark matter.

Authors:
ORCiD logo; ORCiD logo;
Publication Date:
Research Org.:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1664576
Alternate Identifier(s):
OSTI ID: 1711417
Grant/Contract Number:  
SC0011842
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 102 Journal Issue: 5; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; extensions of Higgs sector; extensions of fermion sector; extensions of gauge sector; particle dark matter; kaons

Citation Formats

Hostert, Matheus, Kaneta, Kunio, and Pospelov, Maxim. Pair production of dark particles in meson decays. United States: N. p., 2020. Web. https://doi.org/10.1103/physrevd.102.055016.
Hostert, Matheus, Kaneta, Kunio, & Pospelov, Maxim. Pair production of dark particles in meson decays. United States. https://doi.org/10.1103/physrevd.102.055016
Hostert, Matheus, Kaneta, Kunio, and Pospelov, Maxim. Wed . "Pair production of dark particles in meson decays". United States. https://doi.org/10.1103/physrevd.102.055016.
@article{osti_1664576,
title = {Pair production of dark particles in meson decays},
author = {Hostert, Matheus and Kaneta, Kunio and Pospelov, Maxim},
abstractNote = {Rare decays of K and B mesons provide a powerful probe of dark sectors with light new particles. We show that the pair production of O(100 MeV) dark states can be probed with the decays of KL mesons, owing to the enhanced two-body kinematics, KL→X1X2 or X2X2. If either of these two particles is unstable, e.g., X2→X1π0, X2→X1γ or X1,2→γγ, such decays could easily mimic KL→π0νν¯ signatures, while not being ruled out by the decays of charged kaons. We construct explicit models that have enhanced KL decay signatures, and are constrained by the results of the KOTO experiment. We note that recently reported excess events can also be accommodated while satisfying all other constraints (B decays, colliders, beam dumps). These models are based on the extensions of the gauge and/or scalar sector of the theory. The lightest of X1,2 particles, if stable, could constitute the entirety of dark matter.},
doi = {10.1103/physrevd.102.055016},
journal = {Physical Review D},
number = 5,
volume = 102,
place = {United States},
year = {2020},
month = {9}
}

Journal Article:
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https://doi.org/10.1103/physrevd.102.055016

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