Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-11-28
Phys.Lett.B633:173-182,2006
Physics
High Energy Physics
High Energy Physics - Experiment
16 pages, 7 figures Accepted for publication in Physics Letters B
Scientific paper
10.1016/j.physletb.2005.11.087
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.
Batley The NA48/2 Collaboration J. R.
Lazzeroni Cristina
Munday D. J.
Slater M. W.
Wotton S. A.
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