First search for K+ → π0πμe decays

Ashraf, Muhammad Usman;Cortina Gil, Eduardo;Minucci, Elisa;Padolski, Siarhei;NA62;et.al.
(2024) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 859 (2024)

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Authors
  • Ashraf, Muhammad UsmanUCLouvain
    Author
  • Cortina Gil, Eduardoorcid-logoUCLouvain
    Author
  • Minucci, ElisaUCLouvain
    Author
  • Padolski, SiarheiUCLouvain
    Author
  • Rumenov Petrov, PlamenUCLouvain
    Author
  • Shaikhiev, ArturUCLouvain
    Author
  • Volpe, RobertaUCLouvain
    Author
  • NA62
    Author
  • et. al.
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Abstract
The first search for the lepton number violating decay <math altimg="si1.svg"><msup><mrow><mi>K</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msup><mo stretchy="false">→</mo><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo></mrow></msup><msup><mrow><mi>μ</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msup></math> and lepton flavour violating decays <math altimg="si131.svg"><msup><mrow><mi>K</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msup><mo stretchy="false">→</mo><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msup><msup><mrow><mi>μ</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msup></math>, <math altimg="si132.svg"><msup><mrow><mi>K</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msup><mo stretchy="false">→</mo><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msup><msup><mrow><mi>μ</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo></mrow></msup></math> has been performed using a dataset collected by the NA62 experiment at CERN in 2016–2018. Upper limits of <math altimg="si4.svg"><mn>2.9</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>10</mn></mrow></msup></math>, <math altimg="si5.svg"><mn>3.1</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>10</mn></mrow></msup></math> and <math altimg="si6.svg"><mn>5.0</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>10</mn></mrow></msup></math>, respectively, are obtained at 90% CL for the branching ratios of the three decays on the assumption of uniform phase-space distributions.
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Ashraf, M. U., Cortina Gil, E., Minucci, E., Padolski, S., Rumenov Petrov, P., Shaikhiev, A., Volpe, R., NA62, & et al. (2024). First search for K+ → π0πμe decays. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 859. https://doi.org/10.1016/j.physletb.2024.139122 (Original work published 2024)