Experimental study of direct photon emission in K- --> pi- pi0 gamma decay using ISTRA+ detector
High Energy Physics - Experiment
2008-11-26 v1
Abstract
The branching ratio in the charged-pion kinetic energy region of 55 to 90 MeV for the direct photon emission in the K- --> pi- pi0 gamma decay has been measured using in-flight decays detected with the ISTRA+ setup operating in the 25 GeV/c negative secondary beam of the U-70 PS. The value Br(DE)=[0.37+-0.39(stat)+-0.10(syst)]*10^(-5) obtained from the analysis of 930 completely reconstructed events is consistent with the average value of two stopped-kaon experiments, but it differs by 2.5 standard deviations from the average value of three in-flight-kaon experiments. The result is also compared with recent theoretical predictions.
Cite
@article{arxiv.hep-ex/0410049,
title = {Experimental study of direct photon emission in K- --> pi- pi0 gamma decay using ISTRA+ detector},
author = {V. A. Uvarov and S. A. Akimenko and G. I. Britvich and K. V. Datsko and A. P. Filin and A. V. Inyakin and V. A. Khmelnikov and A. S. Konstantinov and V. F. Konstantinov and I. Y. Korolkov and V. M. Leontiev and V. P. Novikov and V. F. Obraztsov and V. A. Polyakov and V. I. Romanovsky and V. M. Ronjin and V. I. Shelikhov and N. E. Smirnov and O. G. Tchikilev and O. P. Yushchenko and V. N. Bolotov and V. A. Duk and S. V. Laptev and A. Yu. Polyarush},
journal= {arXiv preprint arXiv:hep-ex/0410049},
year = {2008}
}
Comments
13 pages, 8 figures