Back to Search Start Over

Observation of a cusp-like structure in the π0π0 invariant mass distribution from K±→π±π0π0 decay and determination of the ππ scattering lengths

Authors :
J.R. Batley
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
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
H. Wahl
A. Bizzeti
M. Calvetti
E. Celeghini
E. Iacopini
M. Lenti
F. Martelli
G. Ruggiero
M. Veltri
M. Behler
K. Eppard
K. Kleinknecht
P. Marouelli
L. Masetti
U. Moosbrugger
C. Morales Morales
B. Renk
M. Wache
R. Wanke
A. Winhart
D. Coward
A. Dabrowski
T. Fonseca Martin
M. Shieh
M. Szleper
M. Velasco
M.D. Wood
G. Anzivino
P. Cenci
E. Imbergamo
M. Pepe
M.C. Petrucci
M. Piccini
M. Raggi
M. Valdata-Nappi
C. Cerri
G. Collazuol
F. Costantini
L. DiLella
N. Doble
R. Fantechi
L. Fiorini
S. Giudici
G. Lamanna
I. Mannelli
A. Michetti
G. Pierazzini
M. Sozzi
B. Bloch-Devaux
C. Cheshkov
J.B. Chèze
M. De Beer
J. Derré
G. Marel
E. Mazzucato
B. Peyaud
B. Vallage
M. Holder
A. Maier
M. Ziolkowski
S. Bifani
C. Biino
N. Cartiglia
M. Clemencic
S. Goy Lopez
F. Marchetto
H. Dibon
M. Jeitler
M. Markytan
I. Mikulec
G. Neuhofer
L. Widhalm
Source :
Physics Letters B. 633:173-182
Publication Year :
2006
Publisher :
Elsevier BV, 2006.

Abstract

We report the results from a study of ~23 Million K+- ==> pi+- pizero pizero decays recorded by the NA48/2 experiment at the CERN SPS, showing an anomaly in the pizero pizero invariant mass distribution in the region around 2m+, where m+ is the charged pion mass. This anomaly, never observed in previous experiments, can be interpreted as an effect due mainly to the final state charge exchange scattering process pi+ pi- ==> pizero pizero in K+- ==> pi+- pi+ pi- decay. It provides a precise determination of a0 - a2, the difference between the pi-pi scattering lengths in the isospin I=0 and I=2 states.

Details

ISSN :
03702693
Volume :
633
Database :
OpenAIRE
Journal :
Physics Letters B
Accession number :
edsair.doi...........9bad65080244a98c8e4cdbaa6d9dba2e