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

Journal Article · Mon Dec 01 00:00:00 EST 1980 · Phys. Rev., D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.22.2688· OSTI ID:7053449

Cho, Y; Derrick, M; Miller, R J; Schlereth, J; Engler, A; Keyes, G S; Kraemer, R W; Tanaka, M

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.

• Research Organization: Argonne National Laboratory, Argonne, Illinois 60439
• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 7053449
• Journal Information: Phys. Rev., D; (United States), Vol. 22:11
• Country of Publication: United States
• Language: English

Related Subjects

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