CP violations in π± meson decay

被引：31

作者：

Cvetic, Gorazd ^{[1
]}

Kim, C. S. ^{[2
,3
]}

Zamora-Saa, Jilberto ^{[1
]}

机构：

[1] Univ Tecn Federico Santa Maria, Dept Phys, Valparaiso, Chile

[2] Yonsei Univ, Dept Phys, Seoul 120749, South Korea

[3] Yonsei Univ, IPAP, Seoul 120749, South Korea

来源：

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS | 2014年 / 41卷 / 07期

关键词：

Majorana neutrino; CP violation; nuMSM model; DOUBLE-BETA DECAY; LEPTON-NUMBER; STERILE NEUTRINOS; UPPER-BOUNDS; DARK-MATTER; VMSM;

D O I：

10.1088/0954-3899/41/7/075004

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We study the pion decays with intermediate on-shell neutrinos N into two electrons and a muon, pi(+/-) -> e(+/-) N -> e(+/-) e(+/-)mu(-/+)nu. We investigate the branching ratios Br-+/- = [Gamma(pi(-) -> e(-) e(-) mu(+) nu) +/- Gamma(pi(+) -> e(+) e(+) mu(-) nu)]/Gamma(pi(-) -> all) and the CP asymmetry ratio A(CP) = Br-/Br+ for such decays, in the scenario with two different on-shell neutrinos. If N is Dirac, only the lepton number conserving (LC) decays contribute (LC: nu = nu(e) or (nu) overbar(e)); if N is Majorana, both LC and lepton number violating (LV) decays contribute (LV: nu = (nu) overbar(mu) or nu = nu(mu)). The results show that the CP asymmetry A(CP) is in general very small, but increases and becomes similar to 1 when the masses of the two intermediate neutrinos get closer to each other, i.e., when their mass difference becomes comparable with their decay width, Delta MN >> Gamma(N). The observation of CP violation in pion decays would be consistent with the existence of the well-motivated nu MSM model with two almost degenerate heavy neutrinos.

引用

页数：18

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