Determination of the S-wave ππ scattering lengths from a study of K±→π±π0π0 decays

被引：0
作者：
J. R. Batley
A. J. Culling
G. Kalmus
C. Lazzeroni
D. J. Munday
M. W. Slater
S. A. Wotton
R. Arcidiacono
G. Bocquet
N. Cabibbo
A. Ceccucci
D. Cundy
V. Falaleev
M. Fidecaro
L. Gatignon
A. Gonidec
W. Kubischta
A. Norton
A. Maier
M. Patel
A. Peters
S. Balev
P. L. Frabetti
E. Goudzovski
P. Hristov
V. Kekelidze
V. Kozhuharov
L. Litov
D. Madigozhin
E. Marinova
N. Molokanova
I. Polenkevich
Yu. Potrebenikov
S. Stoynev
A. Zinchenko
E. Monnier
E. Swallow
R. Winston
P. Rubin
A. Walker
W. Baldini
A. Cotta Ramusino
P. Dalpiaz
C. Damiani
M. Fiorini
A. Gianoli
M. Martini
F. Petrucci
M. Savrié
M. Scarpa
机构：
[1] University of Cambridge,Cavendish Laboratory
[2] CERN,The Enrico Fermi Institute
[3] Joint Institute for Nuclear Research,Department of Physics and Astronomy
[4] The University of Chicago,Institut für Physik
[5] University of Edinburgh,Department of Physics and Astronomy
[6] Dipartimento di Fisica dell’Università e Sezione dell’INFN di Ferrara,Fachbereich Physik
[7] Dipartimento di Fisica dell’Università e Sezione dell’INFN di Firenze,Institut für Hochenergiephysik
[8] Sezione dell’INFN di Firenze,undefined
[9] Universität Mainz,undefined
[10] Northwestern University,undefined
[11] Dipartimento di Fisica dell’Università e Sezione dell’INFN di Perugia,undefined
[12] Sezione dell’INFN di Perugia,undefined
[13] Sezione dell’INFN di Pisa,undefined
[14] Scuola Normale Superiore e Sezione dell’INFN di Pisa,undefined
[15] Dipartimento di Fisica dell’Università e Sezione dell’INFN di Pisa,undefined
[16] DSM/IRFU—CEA Saclay,undefined
[17] Universität Siegen,undefined
[18] Sezione dell’INFN di Torino,undefined
[19] Dipartimento di Fisica Sperimentale dell’Università e Sezione dell’INFN di Torino,undefined
[20] Österreichische Akademie der Wissenschaften,undefined
来源：
The European Physical Journal C | 2009年 / 64卷
关键词：
13.25.Es; 13.75.Lb; 13.40.Ks; 14.40.Aq;
D O I：
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中图分类号：
学科分类号：
摘要：
We report the results from a study of the full sample of ∼6.031×107K±→π±π0π0 decays recorded by the NA48/2 experiment at the CERN SPS. As first observed in this experiment, the π0π0 invariant mass (M00) distribution shows a cusp-like anomaly in the region around M00=2m+, where m+ is the charged pion mass. This anomaly has been interpreted as an effect due mainly to the final state charge exchange scattering process π+π−→π0π0 in K±→π±π+π− decay. Fits to the M00 distribution using two different theoretical formulations provide the presently most precise determination of a0−a2, the difference between the ππ S-wave scattering lengths in the isospin I=0 and I=2 states. Higher-order ππ rescattering terms, included in the two formulations, allow also an independent, though less precise, determination of a2.
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页码：589 / 608
页数：19
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