CERN Accelerating science

Article
Title	Measurement of the K$_{s}^{0} \rightarrow \pi^{+}\pi^{-}\gamma$
Author(s)	Burgun, G ; Bertranet, P ; James, F ; Lesquoy, E ; Montanet, Lucien ; Müller, A ; Paul, E ; Pauli, E ; Saetre, P ; Sendall, D M ; Zylberajch, S
Affiliation	(CEN-Saclay, France)
Publication	1973
In:	Phys. Lett. B 46, 3 (1973) pp.481-5
Subject category	Particle Physics - Phenomenology
Abstract	From a study of 70000 K/sup 0/ decays in the CERN 2m hydrogen bubble chamber, the rate for K/sub S//sup 0/ to pi /sup +/ pi /sup -/ gamma for different custs in the gamma momentum has been estimated. The results are in good agreement with inner bremsstrahlung on K/sub S //sup 0/ to pi /sup +/ pi /sup -/. For gamma momentum in the K/sup 0/ c.m. greater than 50 MeV/c, the branching ratio: Gamma (K/sub S/ to pi /sup +/ pi /sup -/ gamma , k>50 MeV/c)/ Gamma (K/sub S/ to pi /sup +/ pi /sup -/)=(2.8+or-0.6)*10/sup -3/ has been obtained. This leads to an estimate for the direct gamma emission process: Gamma (K/sub S/ to pi /sup +/ pi /sup -/ gamma direct)/ Gamma (K/sub S/ to pi /sup +/ pi /sup -/)=(0.3+or-0.6)*10/sup -3/. (12 refs).