Σ+ → pμ+μ−: Standard Model or New Particle?

Valencia, G.

doi:doi:10.1063/1.2402636

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AIP Conference Proceedings / Volume 870

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Σ⁺ → pμ⁺μ⁻: Standard Model or New Particle?

AIP Conf. Proc. 870, pp. 283-286; doi:http://dx.doi.org/10.1063/1.2402636 (4 pages)

INTERSECTIONS OF PARTICLE AND NUCLEAR PHYSICS: 9th Conference CIPAN2006

Date: 30 May-3June 2006

Location: Rio Grande, Puerto Rico (USA)

G. Valencia

Department of Physics, Iowa State University, Ames, LA 50011

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Abstract

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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 m_μμ 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 Ω → Ξμ⁺μ⁻ decays. © 2006 American Institute of Physics