Experimental study of the rare K/sup -/ decay modes K/sup -/. --> pi. /sup 0/. gamma. e/sup -/nu-bar and K/sup -/. --> pi. /sup 0/. pi. /sup 0/e/sup -/nu-bar

Journal Article · Tue Jul 01 00:00:00 EDT 1986 · Sov. J. Nucl. Phys. (Engl. Transl.); (United States)

OSTI ID:6688716

Bolotov, V N; Gninenko, S N; Dzhilkibaev, R M; Isakov, V V; Klubakov, Y M; Laptev, V D; Lobashev, V M; Marin, V P; Postoev, V E; Poblaguev, A A; others, and

The decay probability GAMMA(K/sup -/..--> pi../sup 0/..pi../sup 0/e/sup -/nu-bar) = (1.6/sup +0.4//sub -0.3/) x 10/sup 3/ sec/sup -1/ and the form factors chemically bond f/sub 1/chemically bond = 1.4/sup +0.18//sub -0.13/ were measured. The dependence of the K/sup -/..--> pi../sup 0/..gamma..e/sup -/nu-bar decay probability on the ..gamma..-ray detection threshold energy was investigated: GAMMA(K/sup -/..--> pi../sup 0/..gamma..e/sup -/nu-bar)/GAMMA(K..-->..all) = (2.7 +- 0.2) x 10/sup -4/ at E/sub ..gamma../ >10 MeV and 0.6<0.9. The upper bound of the structural ..gamma..-ray emission at 90% confidence level was found to be GAMMA(K..--> pi../sup 0/..gamma..e/sup -/nu-bar)/sub SD// GAMMA(K..-->..all)<5.3x10/sup -5/. Violation of the electromagnetic-interaction T-invariance in the K..--> pi../sup 0/..gamma..e..nu.. decay leads to asymmetry in the (p/sub e/ x p/sub ..gamma../)xp/sub ..pi..//sub =/ distribution. The experimental value of the asymmetry parameter is 0.03 +- 0.08.

• Research Organization: Institute of Nuclear Research, USSR Academy of Sciences
• OSTI ID: 6688716
• Journal Information: Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Vol. 44:1
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
KAONS MINUS
SEMILEPTONIC DECAY
ASYMMETRY
BRANCHING RATIO
ELECTRON ANTINEUTRINOS
ELECTRONS
KAONS NEUTRAL
PHOTONS
T INVARIANCE
ANTILEPTONS
ANTIMATTER
ANTINEUTRINOS
ANTIPARTICLES
BOSONS
DECAY
ELECTRON NEUTRINOS
ELEMENTARY PARTICLES
FERMIONS
HADRONS
INVARIANCE PRINCIPLES
KAONS
LEPTONS
MASSLESS PARTICLES
MESONS
NEUTRINOS
PARTICLE DECAY
PSEUDOSCALAR MESONS
STRANGE MESONS
STRANGE PARTICLES
WEAK PARTICLE DECAY
645102* - High Energy Physics- Particle Interactions &amp; Properties-Experimental- Weak Interactions &amp; Properties