TY - JOUR
T1 - CP violation in lepton number violating semihadronic decays of K,D,Ds,B,Bc
AU - Cvetič, Gorazd
AU - Kim, C. S.
AU - Zamora-Saá, Jilberto
N1 - Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/5/13
Y1 - 2014/5/13
N2 - We study the CP violation in lepton-number-violating meson decays M±→1±2±M′, where M and M′ are pseudoscalar mesons, M=K,D,Ds,B,Bc and M′=π,K,D,Ds, and the charged leptons are 1,2=e,μ. It turns out that the CP-violating difference S-(M) ≡[Γ(M-→1-2-M′+)-Γ(M+→1+2+M′-)] can become appreciable when two intermediate on-shell Majorana neutrinos Nj (j=1,2) participate in these decays. Our calculations show that the asymmetry becomes largest when the masses of N1 and N2 are almost degenerate, i.e., when the mass difference ΔMN becomes comparable with the (small) decay widths ΓN of these neutrinos: ΔMNΓN. We show that in such a case, the CP ratio ACP(M)≡[Γ(M-→1-2-M′+)-Γ(M+→1+2+M′-)]/ [Γ(M-→1-2-M′+)+Γ(M+→1+2+M′-)] becomes a quantity ∼1. The observation of CP violation in these decays would be consistent with the existence of the well-motivated νMSM model with two almost degenerate heavy neutrinos in the mass range MN∼0.1-101GeV.
AB - We study the CP violation in lepton-number-violating meson decays M±→1±2±M′, where M and M′ are pseudoscalar mesons, M=K,D,Ds,B,Bc and M′=π,K,D,Ds, and the charged leptons are 1,2=e,μ. It turns out that the CP-violating difference S-(M) ≡[Γ(M-→1-2-M′+)-Γ(M+→1+2+M′-)] can become appreciable when two intermediate on-shell Majorana neutrinos Nj (j=1,2) participate in these decays. Our calculations show that the asymmetry becomes largest when the masses of N1 and N2 are almost degenerate, i.e., when the mass difference ΔMN becomes comparable with the (small) decay widths ΓN of these neutrinos: ΔMNΓN. We show that in such a case, the CP ratio ACP(M)≡[Γ(M-→1-2-M′+)-Γ(M+→1+2+M′-)]/ [Γ(M-→1-2-M′+)+Γ(M+→1+2+M′-)] becomes a quantity ∼1. The observation of CP violation in these decays would be consistent with the existence of the well-motivated νMSM model with two almost degenerate heavy neutrinos in the mass range MN∼0.1-101GeV.
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U2 - 10.1103/PhysRevD.89.093012
DO - 10.1103/PhysRevD.89.093012
M3 - Article
AN - SCOPUS:84900851597
VL - 89
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
SN - 1550-7998
IS - 9
M1 - 093012
ER -