Details

Autor(en) / Beteiligte

• He, Xiao-Gang
• Tandean, Jusak
• Valencia, German

Titel

Decay rate and asymmetries of Σ+ → pμ+μ

Ist Teil von

• The journal of high energy physics, 2018-10, Vol.2018 (10), p.1-20, Article 40

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2018

Link zum Volltext

Quelle

EZB-FREE-00999 freely available EZB journals

Beschreibungen/Notizen

• A bstract The LHCb Collaboration has recently reported evidence for the rare hyperon decay Σ + → pμ + μ − that is consistent with the standard model expectation. Motivated by this new result we revisit the calculation of this mode including both long and short distance contributions. In the standard model this mode is completely dominated by long distance physics and thus subject to large uncertainties. We present a range of predictions for the rate, the dimuon invariant mass spectrum, and a muon polarization asymmetry that covers these uncertainties as well as known constraints. We study the interplay between short and long distance contributions which could result in additional asymmetries, but we find that they are negligible within the standard model. We propose a parameterization of these asymmetries in terms of a couple of constants that can arise from new physics.