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.
|Title of host publication||INTERSECTIONS OF PARTICLE AND NUCLEAR PHYSICS: 9th Conference on the Intersections of Particle and Nuclear Physics, CIPAN2006|
|Number of pages||4|
|Publication status||Published - 2006|
|Event||INTERSECTIONS OF PARTICLE AND NUCLEAR PHYSICS: 9th Conference on the Intersections of Particle and Nuclear Physics, CIPAN2006 - Rio Grande, Puerto Rico|
Duration: 30 May 2006 → 3 Jun 2006
|Conference||INTERSECTIONS OF PARTICLE AND NUCLEAR PHYSICS: 9th Conference on the Intersections of Particle and Nuclear Physics, CIPAN2006|
|Period||30/05/06 → 3/06/06|