On the lifetime of the π+ π- atom

Abstract

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.

Original language	English
Pages (from-to)	335-340
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	462
Issue number	3-4
DOIs	https://doi.org/10.1016/S0370-2693(99)00918-1
Publication status	Published - 1999

Keywords

Chiral perturbation theory
Hadronic atoms
Nonrelativistic effective Lagrangians

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1016/S0370-2693(99)00918-1

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title = "On the lifetime of the π+ π- atom",

abstract = "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.",

keywords = "Chiral perturbation theory, Hadronic atoms, Nonrelativistic effective Lagrangians",

author = "A. Gall and J. Gasser and Lyubovitskij, {V. E.} and A. Rusetsky",

year = "1999",

doi = "10.1016/S0370-2693(99)00918-1",

language = "English",

volume = "462",

pages = "335--340",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

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number = "3-4",

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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

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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