TY - JOUR
T1 - On the lifetime of the π+ π- atom
AU - Gall, A.
AU - Gasser, J.
AU - Lyubovitskij, V. E.
AU - Rusetsky, A.
PY - 1999
Y1 - 1999
N2 - The π+ π- atom decays - in the ground state - predominantly into two neutral pions. We present a general expression for the corresponding decay width in the framework of QCD (including photons). It contains all terms at leading and next-to-leading order in isospin breaking. The result allows one to evaluate the combination |α0 - α2| of ππ S-wave scattering lengths from π+π- lifetime measurements, like the one presently performed by the DIRAC experiment at CERN.
AB - The π+ π- atom decays - in the ground state - predominantly into two neutral pions. We present a general expression for the corresponding decay width in the framework of QCD (including photons). It contains all terms at leading and next-to-leading order in isospin breaking. The result allows one to evaluate the combination |α0 - α2| of ππ S-wave scattering lengths from π+π- lifetime measurements, like the one presently performed by the DIRAC experiment at CERN.
KW - Chiral perturbation theory
KW - Hadronic atoms
KW - Nonrelativistic effective Lagrangians
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U2 - 10.1016/S0370-2693(99)00918-1
DO - 10.1016/S0370-2693(99)00918-1
M3 - Article
AN - SCOPUS:0000150543
VL - 462
SP - 335
EP - 340
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 3-4
ER -