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Title: Measurement of the K/sup 0//sub L/ form factors from K/sup 0//sub L/. --> pi mu nu. decays in the 12-foot bubble chamber

Abstract

We report results of a measurement of the form factors in K/sup 0//sub L/ leptonic decay. We analyze both the Dalitz plot of the decay K/sup 0//sub L/..--> pi mu nu.. and the branching ratio GAMMA(K/sup 0//sub mu3/)/GAMMA(K/sup 0//sub e/3). The experiment was performed in the Argonne 12-foot bubble chamber exposed to a monoenergetic K/sup 0//sub L/ beam. Simultaneous detection of ..pi mu nu.. and ..pi..e..nu.. decays with large acceptance results in well understood systematic uncertainties. The results have been analyzed to give lambda/sub +/ and lambda/sub 0/, the expansion parameters of the form factors dominated by 1/sup -/ and 0/sup +/ K* poles, respectively. From our branching-ratio measurement of GAMMA(K/sup 0//sub mu3/)/GAMMA(K/sup 0//sub e/3)=0.702 +- 0.011, we obtain lambda/sub 0/=0.041 +- 0.008. A fit to the K/sup 0//sub mu3/ Dalitz-plot density distribution gives lambda/sub 0/=0.050 +- 0.008 and lambda/sub +/=0.028 +- 0.010. These numbers are in agreement with our analysis of the K/sup 0//sub e/3 decay Dalitz plot and with other recent measurements. A combined fit to all of our data yields lambda/sub +/=0.028 +- 0.007 and lambda/sub 0/=0.046 +- 0.006.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Laboratory, Argonne, Illinois 60439
OSTI Identifier:
7053449
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Journal Article
Journal Name:
Phys. Rev., D; (United States)
Additional Journal Information:
Journal Volume: 22:11
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; KAONS NEUTRAL LONG-LIVED; FORM FACTORS; SEMILEPTONIC DECAY; BRANCHING RATIO; BUBBLE CHAMBERS; DALITZ PLOT; ENERGY LEVELS; EXPERIMENTAL DATA; MATRIX ELEMENTS; MUONS; NEUTRINOS; PARITY; PIONS; SPIN; ANGULAR MOMENTUM; BOSONS; DATA; DECAY; DIAGRAMS; ELEMENTARY PARTICLES; FERMIONS; GAS TRACK DETECTORS; HADRONS; INFORMATION; KAONS; KAONS NEUTRAL; LEPTONS; MASSLESS PARTICLES; MEASURING INSTRUMENTS; MESONS; NUMERICAL DATA; PARTICLE DECAY; PARTICLE PROPERTIES; PSEUDOSCALAR MESONS; RADIATION DETECTORS; SCATTERPLOTS; STRANGE PARTICLES; WEAK PARTICLE DECAY; 645102* - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties

Citation Formats

Cho, Y, Derrick, M, Miller, R J, Schlereth, J, Engler, A, Keyes, G S, Kraemer, R W, and Tanaka, M. Measurement of the K/sup 0//sub L/ form factors from K/sup 0//sub L/. --> pi mu nu. decays in the 12-foot bubble chamber. United States: N. p., 1980. Web. doi:10.1103/PhysRevD.22.2688.
Cho, Y, Derrick, M, Miller, R J, Schlereth, J, Engler, A, Keyes, G S, Kraemer, R W, & Tanaka, M. Measurement of the K/sup 0//sub L/ form factors from K/sup 0//sub L/. --> pi mu nu. decays in the 12-foot bubble chamber. United States. https://doi.org/10.1103/PhysRevD.22.2688
Cho, Y, Derrick, M, Miller, R J, Schlereth, J, Engler, A, Keyes, G S, Kraemer, R W, and Tanaka, M. Mon . "Measurement of the K/sup 0//sub L/ form factors from K/sup 0//sub L/. --> pi mu nu. decays in the 12-foot bubble chamber". United States. https://doi.org/10.1103/PhysRevD.22.2688.
@article{osti_7053449,
title = {Measurement of the K/sup 0//sub L/ form factors from K/sup 0//sub L/. --> pi mu nu. decays in the 12-foot bubble chamber},
author = {Cho, Y and Derrick, M and Miller, R J and Schlereth, J and Engler, A and Keyes, G S and Kraemer, R W and Tanaka, M},
abstractNote = {We report results of a measurement of the form factors in K/sup 0//sub L/ leptonic decay. We analyze both the Dalitz plot of the decay K/sup 0//sub L/..--> pi mu nu.. and the branching ratio GAMMA(K/sup 0//sub mu3/)/GAMMA(K/sup 0//sub e/3). The experiment was performed in the Argonne 12-foot bubble chamber exposed to a monoenergetic K/sup 0//sub L/ beam. Simultaneous detection of ..pi mu nu.. and ..pi..e..nu.. decays with large acceptance results in well understood systematic uncertainties. The results have been analyzed to give lambda/sub +/ and lambda/sub 0/, the expansion parameters of the form factors dominated by 1/sup -/ and 0/sup +/ K* poles, respectively. From our branching-ratio measurement of GAMMA(K/sup 0//sub mu3/)/GAMMA(K/sup 0//sub e/3)=0.702 +- 0.011, we obtain lambda/sub 0/=0.041 +- 0.008. A fit to the K/sup 0//sub mu3/ Dalitz-plot density distribution gives lambda/sub 0/=0.050 +- 0.008 and lambda/sub +/=0.028 +- 0.010. These numbers are in agreement with our analysis of the K/sup 0//sub e/3 decay Dalitz plot and with other recent measurements. A combined fit to all of our data yields lambda/sub +/=0.028 +- 0.007 and lambda/sub 0/=0.046 +- 0.006.},
doi = {10.1103/PhysRevD.22.2688},
url = {https://www.osti.gov/biblio/7053449}, journal = {Phys. Rev., D; (United States)},
number = ,
volume = 22:11,
place = {United States},
year = {1980},
month = {12}
}