New Measurement of $K_{e 4}^{+}$ Decay and the $s$ -Wave $π π$ -Scattering Length $a_{0}^{0}$

Authors:

RAR. Appel
R. Appel
GAG. S. Atoyan
G. S. Atoyan
BBB. Bassalleck
B. Bassalleck
DBD. R. Bergman
D. R. Bergman
NCN. Cheung
N. Cheung
SDS. Dhawan
S. Dhawan
HDH. Do
H. Do
JEJ. Egger
J. Egger
SES. Eilerts
S. Eilerts
WHW. Herold
W. Herold
VIV. V. Issakov
V. V. Issakov

Publisher website

7 November 2001

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 87 (22) , 221801
DOI:10.1103/physrevlett.87.221801
PMID:11736394

Abstract

A sample of

4 \times 10^{5}

events from the decay

K^{+} \to π^{+} π^{-} e^{+} ν_{e} (K_{e 4})

has been collected in experiment E865 at the Brookhaven Alternating Gradient Synchrotron. The analysis of these data yields new measurements of the

K_{e 4}

branching ratio

[(4.11 \pm 0.01 \pm 0.11) \times 10^{- 5}]

, the

s

-wave

π π

scattering length

[a_{0}^{0} = 0.216 \pm 0.013 (stat) \pm 0.004 (syst) \pm 0.005 (theor)]

, and the form factors

F

,

G

, and

H

of the hadronic current and their dependence on the invariant

π π

mass.

Keywords

All Related Versions

Version 1, 2001-06-19, ArXiv (Unconfirmed version)

This publication has 36 references indexed in Scilit:

Phenomenological Lagrangians
Physica A: Statistical Mechanics and its Applications, 1979
Experimental study of 30 000 $K_{e 4}$ decays
Physical Review D, 1977
Pion-Pion Phase Shift and Form Factors in the Decays $K^{\pm} \to π^{+} π^{-} e^{\pm} ν_{e}$
Physical Review Letters, 1973
Experimental Tests of Discrete Symmetries in the Decays $K^{\pm} \to π^{+} π^{-} e^{\pm} ν_{e}$
Physical Review Letters, 1972
Further results on Ke4 decay and energy dependence of low-energy-ππ-phase shift
Physics Letters B, 1972
Determination of the low-energy π − π phase shifts and form factors in Ke4+ decay
Physics Letters B, 1971
Measurement of Ke4+ - decay rates and test of the ΔS = ΔQ rule
Physics Letters B, 1971
An experimental study of the decay rate, form factors and ππ phase-shift in Ke4+ decay
Physics Letters B, 1971
Study of $K_{e 4}$ Decays
Physical Review B, 1969
Experimental Study of $K_{e 4}^{+}$ Decay
Physical Review B, 1965