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Standard Model estimate of K+ →π+4e branching ratio

Husek, Tomáš LU (2022) In Physical Review D 106(7).
Abstract

The branching ratio of the K+→π+e+e-e+e- (K+→π+4e) decay is calculated at leading order in the Standard Model. The dominance of the neutral-pion pole determines the overall branching ratio to be B(K+→π+4e)=B(K+→π+π0)B(π0→4e)≈7.0(3)×10-6. The significance of this contribution is very much concentrated in the context of the whole available phase space, throughout most of which the one-photon-exchange topology is prevalent in turn. It is thus interesting to present branching ratios for only parts of the allowed kinematical region. We find, for instance, B(K+→π+4e,m4e>150 MeV)=6.0(6)×10-11.

Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review D
volume
106
issue
7
article number
L071301
publisher
American Physical Society
external identifiers
  • scopus:85140855001
ISSN
2470-0010
DOI
10.1103/PhysRevD.106.L071301
language
English
LU publication?
yes
id
0bd213f1-288b-4cc9-bad2-7ea01cd3b9b6
date added to LUP
2022-12-13 15:44:55
date last changed
2024-04-18 17:14:36
@article{0bd213f1-288b-4cc9-bad2-7ea01cd3b9b6,
  abstract     = {{<p>The branching ratio of the K+→π+e+e-e+e- (K+→π+4e) decay is calculated at leading order in the Standard Model. The dominance of the neutral-pion pole determines the overall branching ratio to be B(K+→π+4e)=B(K+→π+π0)B(π0→4e)≈7.0(3)×10-6. The significance of this contribution is very much concentrated in the context of the whole available phase space, throughout most of which the one-photon-exchange topology is prevalent in turn. It is thus interesting to present branching ratios for only parts of the allowed kinematical region. We find, for instance, B(K+→π+4e,m4e&gt;150 MeV)=6.0(6)×10-11.</p>}},
  author       = {{Husek, Tomáš}},
  issn         = {{2470-0010}},
  language     = {{eng}},
  number       = {{7}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review D}},
  title        = {{Standard Model estimate of K+ →π+4e branching ratio}},
  url          = {{http://dx.doi.org/10.1103/PhysRevD.106.L071301}},
  doi          = {{10.1103/PhysRevD.106.L071301}},
  volume       = {{106}},
  year         = {{2022}},
}