CP violation in semileptonic tau lepton decays

Journal Article · Mon Aug 01 04:00:00 EDT 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.72.033009· OSTI ID:20711199

Delepine, D; Castro, G Lopez; Lozano, L.-T. Lopez ^[1]

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1. Instituto de Fisica, Universidad de Guanajuato, Loma del Bosque 103, Lomas del Campestre, 37150 Leon, Guanajuato (Mexico)

The leading order contribution to the direct CP asymmetry in {tau}{sup {+-}}{yields}K{sup {+-}}{pi}{sup 0}{nu}{sub {tau}} decay rates is evaluated within the standard model. The weak phase required for CP violation is introduced through an interesting mechanism involving second order weak interactions, which is also responsible for tiny violations of the {delta}S={delta}Q rule in K{sub l3} decays. The calculated CP asymmetry turns out to be of order 10{sup -12}, leaving a large window for studying effects of nonstandard sources of CP violation in this observable.

• OSTI ID: 20711199
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 3 Vol. 72; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
CP INVARIANCE
KAONS MINUS
KAONS PLUS
PARTICLE DECAY
PIONS NEUTRAL
STANDARD MODEL
TAU NEUTRINOS
TAU PARTICLES
WEAK INTERACTIONS