Reanalysis of the decay [ital K][sub [ital L]][r arrow][pi][sup 0][ital e][sup +][ital e][sup [minus]]

Journal Article · Wed Mar 01 00:00:00 EST 1995 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.51.2187· OSTI ID:6578087

Donoghue, J F; Gabbiani, F ^[1]

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1. Department of Physics and Astronomy, University of Massachusetts, Amherst, Massachusetts 01003 (United States)

The decay [ital K][sub [ital L]][r arrow][pi][sup 0][ital e][sup +][ital e][sup [minus]] is searched for as a signal of direct [Delta][ital S]=1 [ital CP] violation. We provide a thorough updating of the analysis of the three components of the decay: (1) direct [ital CP] violation, (2) [ital CP] violation through the mass matrix, and (3) [ital CP]-conserving (two photon) contributions. First the chiral calculation of the [ital K][sub [ital S]][r arrow][pi][sup 0][ital e][sup +][ital e][sup [minus]] rate, due to Ecker, Pich and, de Rafael, is updated to include recent results on the nonleptonic amplitude. Then we systematically explore the uncertainties in this method. These appear to be so large that they will obscure direct [ital CP] violation unless it is possible to measure the [ital K][sub [ital S]][r arrow][pi][sup 0][ital e][sup +][ital e][sup [minus]] rate. The [ital CP]-conserving amplitude remains somewhat uncertain, but present indications are such that there may be a sizable [ital CP]-violating asymmetry in the [ital e][sup +],[ital e][sup [minus]] energies from the interference of the [ital CP]-conserving and [ital CP]-violating amplitudes and this may potentially be useful in determining whether direct [ital CP] violation is present.

• OSTI ID: 6578087
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 51:5; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Pa
CP INVARIANCE
VIOLATIONS
KAONS NEUTRAL LONG-LIVED
PARTICLE DECAY
AMPLITUDES
ASYMMETRY
ELECTRONS
KOBAYASHI-MASKAWA MATRIX
PIONS NEUTRAL
POSITRONS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BOSONS
DECAY
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
HADRONS
INVARIANCE PRINCIPLES
KAONS
KAONS NEUTRAL
LEPTONS
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MATTER
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STRANGE MESONS
STRANGE PARTICLES
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