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Search for a feebly interacting particle X in the decay K+→π+X

Cortina Gil, E. and Husek, T. LU (2021) In Journal of High Energy Physics 2021(3).
Abstract

A search for the K+ → π+X decay, where X is a long-lived feebly interacting particle, is performed through an interpretation of the K+ → π+νν¯ analysis of data collected in 2017 by the NA62 experiment at CERN. Two ranges of X masses, 0–110 MeV/c2 and 154–260 MeV/c2, and lifetimes above 100 ps are considered. The limits set on the branching ratio, BR(K+ → π+X), are competitive with previously reported searches in the first mass range, and improve on current limits in the second mass range by more than an order of magnitude.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Beyond Standard Model, Exotics, Fixed target experiments
in
Journal of High Energy Physics
volume
2021
issue
3
article number
58
publisher
Springer
external identifiers
  • scopus:85104929935
ISSN
1029-8479
DOI
10.1007/JHEP03(2021)058
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2021, The Author(s).
id
98234f55-685f-4e80-926d-d683e2c52a07
date added to LUP
2022-03-30 11:40:56
date last changed
2024-04-12 02:38:17
@article{98234f55-685f-4e80-926d-d683e2c52a07,
  abstract     = {{<p>A search for the K<sup>+</sup> → π<sup>+</sup>X decay, where X is a long-lived feebly interacting particle, is performed through an interpretation of the K<sup>+</sup> → π<sup>+</sup>νν¯ analysis of data collected in 2017 by the NA62 experiment at CERN. Two ranges of X masses, 0–110 MeV/c<sup>2</sup> and 154–260 MeV/c<sup>2</sup>, and lifetimes above 100 ps are considered. The limits set on the branching ratio, BR(K<sup>+</sup> → π<sup>+</sup>X), are competitive with previously reported searches in the first mass range, and improve on current limits in the second mass range by more than an order of magnitude.</p>}},
  author       = {{Cortina Gil, E. and Husek, T.}},
  issn         = {{1029-8479}},
  keywords     = {{Beyond Standard Model; Exotics; Fixed target experiments}},
  language     = {{eng}},
  number       = {{3}},
  publisher    = {{Springer}},
  series       = {{Journal of High Energy Physics}},
  title        = {{Search for a feebly interacting particle X in the decay K<sup>+</sup>→π<sup>+</sup>X}},
  url          = {{http://dx.doi.org/10.1007/JHEP03(2021)058}},
  doi          = {{10.1007/JHEP03(2021)058}},
  volume       = {{2021}},
  year         = {{2021}},
}