Σ+ → pμ+μ-: Standard model or new particle?

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Abstract

The HyperCP collaboration reported last year the observation of three events for the decay Σ+ → pμ+μ -. They suggested that new physics may be required to understand the implied decay rate and the observed mμμ distribution. Motivated by this result we re-examine this mode, both within the standard model and assuming there is a new particle. Within the SM we find that Σ+ → pμ+μ- is long-distance dominated and its rate falls within the range suggested by the HyperCP measurement. If there is a new particle we find that it cannot be a scalar or a vector. If it is a pseudoscalar or axial vector it would lead to significantly enhanced rates in K → ππμ+μ- and → Ξμ +μ- decays.

Original languageEnglish
Title of host publicationINTERSECTIONS OF PARTICLE AND NUCLEAR PHYSICS: 9th Conference on the Intersections of Particle and Nuclear Physics, CIPAN2006
Pages283-286
Number of pages4
Volume870
DOIs
Publication statusPublished - 2006
Externally publishedYes
EventINTERSECTIONS OF PARTICLE AND NUCLEAR PHYSICS: 9th Conference on the Intersections of Particle and Nuclear Physics, CIPAN2006 - Rio Grande, Puerto Rico
Duration: 30 May 20063 Jun 2006

Conference

ConferenceINTERSECTIONS OF PARTICLE AND NUCLEAR PHYSICS: 9th Conference on the Intersections of Particle and Nuclear Physics, CIPAN2006
CountryPuerto Rico
CityRio Grande
Period30/05/063/06/06

Keywords

  • χPT
  • BSM
  • HyperCP

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