Isospin breaking in pion–deuteron scattering and the pion–nucleon scattering lengths

Hoferichter, Martin; Baru, Vadim; Hanhart, Christoph; Kubis, Bastian; Nogga, Andreas; Phillips, Daniel R. (2013). Isospin breaking in pion–deuteron scattering and the pion–nucleon scattering lengths. PoS - proceedings of science, CD12, 093. Scuola Internazionale Superiore di Studi Avanzati SISSA

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In recent years, high-accuracy data for pionic hydrogen and deuterium have become the primary source of information on the pion–nucleon scattering lengths. Matching the experimental precision requires, in particular, the study of isospin-breaking corrections both in pion– nucleon and pion–deuteron scattering. We review the mechanisms that lead to the cancellation of potentially enhanced virtual-photon corrections in the pion–deuteron system, and discuss the subtleties regarding the definition of the pion–nucleon scattering lengths in the presence of electromagnetic interactions by comparing to nucleon–nucleon scattering. Based on the p±p channels we find for the virtual-photon-subtracted scattering lengths in the isospin basis a1/2/ g= (170.5±2.0) · 10−3M−1p and a3/2/ g= (−86.5±1.8) · 10−3M−1p .

Item Type:

Conference or Workshop Item (Paper)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Hoferichter, Martin

Subjects:

500 Science > 530 Physics

ISSN:

1824-8039

Publisher:

Scuola Internazionale Superiore di Studi Avanzati SISSA

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

18 Jun 2014 15:18

Last Modified:

13 Dec 2014 17:17

BORIS DOI:

10.7892/boris.42584

URI:

https://boris.unibe.ch/id/eprint/42584

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