Isospin-breaking corrections in the pion--deuteron scattering length

Meissner, U.G.; Rusetsky, A.; Raha, U.

doi:10.1016/j.physletb.2006.07.001

Journal Article

PreJuSER-54808

Isospin-breaking corrections in the pion--deuteron scattering length

Meissner, U. G.FZJ* ; Raha, U. ; Rusetsky, A.

2006
North-Holland Publ. Amsterdam

Physics letters / B 639, 478 - 482 (2006) [10.1016/j.physletb.2006.07.001]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10599 doi:10.1016/j.physletb.2006.07.001

Abstract: It is shown that isospin-breaking corrections to the pion-deuteron scattering length can be very large, because of the vanishing of the isospin-symmetric contribution to this scattering length at leading order in chiral perturbation theory. We further demonstrate that these corrections can explain the bulk of the discrepancy between the recent experimental data on pionic hydrogen and picnic deuterium. We also give the first determination of the electromagnetic low-energy constant f(1). (c) 2006 Elsevier B.V. All rights reserved.

Keyword(s): pi deuteron: elastic scattering ; pi deuteron: nuclear reaction ; pi deuteron: scattering length ; perturbation theory: chiral ; isospin: violation ; pi nucleon: elastic scattering ; pi nucleon: scattering length ; numerical calculations ; pion-deuteron scattering (auto) ; isospin breaking (auto)