Standard Model estimate of K+ →π+4e branching ratio
(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.
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- author
- Husek, Tomáš LU
- organization
- publishing date
- 2022
- 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>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}}, }