Abstract.
We use the framework of effective field theories to discuss the determination of the S-wave \(\pi N\) scattering lengths from the recent high-precision measurements of pionic deuterium observables. The theoretical analysis proceeds in several steps. Initially, the precise value of the pion-deuteron scattering length \(a_{\pi d}\) is extracted from the data. Next, \(a_{\pi d}\) is related to the S-wave \(\pi N\) scattering lengths a + and a -. We discuss the use of this information for constraining the values of these scattering lengths in the full analysis, which also includes the input from the pionic hydrogen energy shift and width measurements, and thoroughly investigate the accuracy limits for this procedure. In this paper, we also give a detailed comparison to other effective field theory approaches, as well as to the earlier work on the subject, carried out within the potential model and multiple scattering framework.
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Received: 28 January 2005, Published online: 8 April 2005
PACS:
36.10.Gv, 12.39.Fe, 13.75.Cs, 13.75.Gx
A. Rusetsky: On leave of absence from High Energy Physics Institute, Tbilisi State University, University St. 9, 380086 Tbilisi, Georgia.
This research is part of the EU Integrated Infrastructure Initiative Hadron Physics Project under contract number RII3-CT-2004-506078. Work supported in part by DFG (SFB/TR 16, “Subnuclear Structure of Matter”).
An erratum to this article is available at http://dx.doi.org/10.1140/epjc/s2005-02444-1.
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Meißner, UG., Raha, U. & Rusetsky, A. The pion-nucleon scattering lengths from pionic deuterium. Eur. Phys. J. C 41, 213–232 (2005). https://doi.org/10.1140/epjc/s2005-02182-4
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DOI: https://doi.org/10.1140/epjc/s2005-02182-4