Details

Autor(en) / Beteiligte

• He, Xiao-Gang
• Valencia, German
• Wong, Keith

Titel

Constraints on new physics from K→πνν

Ist Teil von

• The European physical journal. C, Particles and fields, 2018-06, Vol.78 (6)

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We study generic effects of new physics on the rare decay modes K L → π 0 ν ν ¯ and K + → π + ν ν ¯ . We discuss several cases: left-handed neutrino couplings; right handed neutrino couplings; neutrino lepton flavour violating (LFV) interactions; and Δ I = 3 / 2 interactions. The first of these cases has been studied before as it covers many new physics extensions of the standard model; the second one requires the existence of a new light (sterile) right-handed neutrino and its contribution to both branching ratios is always additive to the SM. The case of neutrino LFV couplings introduces a CP conserving contribution to K L → π 0 ν ν ¯ which affects the rates in a similar manner as a right handed neutrino as neither one of these interferes with the standard model amplitudes. Finally, we consider new physics with Δ I = 3 / 2 interactions to go beyond the Grossman-Nir bound. We find that the rare kaon rates are only sensitive to new physics scales up to a few GeV for this scenario.