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Title: Study of K{sup -}{yields}{pi}{sup 0}e{sup -}{nu}-bar{sub e}{gamma} decay with ISTRA+ setup

Abstract

Results of study of the K{sup -}{yields}{pi}{sup 0}e{sup -}{nu}-bar{gamma} decay at the ISTRA+ setup are presented. We observed 4476 events of this decay. The branching ratio is found to be R=(Br(K{sup -}{yields}{pi}{sup 0}e{sup -}{nu}-bar{sub e}{gamma}))/(Br(K{sup -}{yields}{pi}{sup 0}e{sup -}{nu}-bar{sub e})) (1.81{+-}0.03(stat.){+-}0.07(syst.)) x 10{sup -2} for E*{sub {gamma}} > 10 MeV and {theta}*{sub e{gamma}} > 10{sup o}. For comparison with the previous experiment the branching ratio with cuts E*{sub {gamma}} > 10 MeV, 0.6 < cos {theta}*{sub e{gamma}} < 0.9 is calculated: R (Br(K{sup -}{yields}{pi}{sup 0}e{sup -}{nu}-bar{sub e}{gamma}))/(Br(K{sup -}{yields}{pi}{sup 0}e{sup -}{nu}-bar{sub e})) (0.47{+-}0.02(stat.) {+-} 0.03(syst.)) x 10{sup -2}. For the cuts E*{sub {gamma}} > 30 MeV and {theta}*{sub e{gamma}} > 20{sup o}, used in most theoretical papers, Br (3.06 {+-} 0.09(stat.) {+-} 0.14(syst.)) x 10{sup -4}. For the asymmetry we get A{sub {xi}} = -0.015 {+-} 0.021. At present it is the best estimate of this asymmetry.

Authors:
 [1];  [2]; ;  [1];  [3];  [1];  [3]; ; ; ; ;  [1]; ;  [3];  [1];  [3]; ; ;  [1];  [4]
  1. Institute for High Energy Physics (Russian Federation)
  2. Russian Academy of Sciences, Institute for Nuclear Research (Russian Federation), E-mail: bolotov@inr.ru
  3. Russian Academy of Sciences, Institute for Nuclear Research (Russian Federation)
  4. Russian Academy of Sciences, Institute for Nuclear Research (Russian Federation) (and others)
Publication Date:
OSTI Identifier:
21075896
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Atomic Nuclei; Journal Volume: 70; Journal Issue: 4; Other Information: DOI: 10.1134/S1063778807040114; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Ltd; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; BRANCHING RATIO; COMPARATIVE EVALUATIONS; ELECTRON ANTINEUTRINOS; ELECTRONS; GAMMA RADIATION; KAONS MINUS; MEV RANGE; PARTICLE DECAY; PIONS NEUTRAL

Citation Formats

Akimenko, S. A., Bolotov, V. N., Britvich, G. I., Datsko, K. V., Duk, V. A., Filin, A. P., Gushchin, E. N., Inyakin, A. V., Khmelnikov, V. A., Konstantinov, A. S., Konstantinov, V. F., Korolkov, I. Yu., Laptev, S. V., Lebedev, V. A., Leontiev, V. M., Mazurov, A. E., Novikov, V. P., Obraztsov, V. F., Polyakov, V. A., and Polyarush, A. Yu. Study of K{sup -}{yields}{pi}{sup 0}e{sup -}{nu}-bar{sub e}{gamma} decay with ISTRA+ setup. United States: N. p., 2007. Web. doi:10.1134/S1063778807040114.
Akimenko, S. A., Bolotov, V. N., Britvich, G. I., Datsko, K. V., Duk, V. A., Filin, A. P., Gushchin, E. N., Inyakin, A. V., Khmelnikov, V. A., Konstantinov, A. S., Konstantinov, V. F., Korolkov, I. Yu., Laptev, S. V., Lebedev, V. A., Leontiev, V. M., Mazurov, A. E., Novikov, V. P., Obraztsov, V. F., Polyakov, V. A., & Polyarush, A. Yu. Study of K{sup -}{yields}{pi}{sup 0}e{sup -}{nu}-bar{sub e}{gamma} decay with ISTRA+ setup. United States. doi:10.1134/S1063778807040114.
Akimenko, S. A., Bolotov, V. N., Britvich, G. I., Datsko, K. V., Duk, V. A., Filin, A. P., Gushchin, E. N., Inyakin, A. V., Khmelnikov, V. A., Konstantinov, A. S., Konstantinov, V. F., Korolkov, I. Yu., Laptev, S. V., Lebedev, V. A., Leontiev, V. M., Mazurov, A. E., Novikov, V. P., Obraztsov, V. F., Polyakov, V. A., and Polyarush, A. Yu. Sun . "Study of K{sup -}{yields}{pi}{sup 0}e{sup -}{nu}-bar{sub e}{gamma} decay with ISTRA+ setup". United States. doi:10.1134/S1063778807040114.
@article{osti_21075896,
title = {Study of K{sup -}{yields}{pi}{sup 0}e{sup -}{nu}-bar{sub e}{gamma} decay with ISTRA+ setup},
author = {Akimenko, S. A. and Bolotov, V. N. and Britvich, G. I. and Datsko, K. V. and Duk, V. A. and Filin, A. P. and Gushchin, E. N. and Inyakin, A. V. and Khmelnikov, V. A. and Konstantinov, A. S. and Konstantinov, V. F. and Korolkov, I. Yu. and Laptev, S. V. and Lebedev, V. A. and Leontiev, V. M. and Mazurov, A. E. and Novikov, V. P. and Obraztsov, V. F. and Polyakov, V. A. and Polyarush, A. Yu.},
abstractNote = {Results of study of the K{sup -}{yields}{pi}{sup 0}e{sup -}{nu}-bar{gamma} decay at the ISTRA+ setup are presented. We observed 4476 events of this decay. The branching ratio is found to be R=(Br(K{sup -}{yields}{pi}{sup 0}e{sup -}{nu}-bar{sub e}{gamma}))/(Br(K{sup -}{yields}{pi}{sup 0}e{sup -}{nu}-bar{sub e})) (1.81{+-}0.03(stat.){+-}0.07(syst.)) x 10{sup -2} for E*{sub {gamma}} > 10 MeV and {theta}*{sub e{gamma}} > 10{sup o}. For comparison with the previous experiment the branching ratio with cuts E*{sub {gamma}} > 10 MeV, 0.6 < cos {theta}*{sub e{gamma}} < 0.9 is calculated: R (Br(K{sup -}{yields}{pi}{sup 0}e{sup -}{nu}-bar{sub e}{gamma}))/(Br(K{sup -}{yields}{pi}{sup 0}e{sup -}{nu}-bar{sub e})) (0.47{+-}0.02(stat.) {+-} 0.03(syst.)) x 10{sup -2}. For the cuts E*{sub {gamma}} > 30 MeV and {theta}*{sub e{gamma}} > 20{sup o}, used in most theoretical papers, Br (3.06 {+-} 0.09(stat.) {+-} 0.14(syst.)) x 10{sup -4}. For the asymmetry we get A{sub {xi}} = -0.015 {+-} 0.021. At present it is the best estimate of this asymmetry.},
doi = {10.1134/S1063778807040114},
journal = {Physics of Atomic Nuclei},
number = 4,
volume = 70,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}