Observation of a unitary cusp in the threshold γp -> π^{0}p reaction

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dc.creatorBernstein, A. M.
dc.creatorShuster, E.
dc.creatorBeck, R.
dc.creatorFuchs, M.
dc.creatorKrusche, B.
dc.creatorMerkel, H.
dc.creatorStroher, H.
dc.date1996-10-07
dc.date.accessioned2026-07-07T11:14:53Z
dc.date.available2026-07-07T11:14:53Z
dc.descriptionA rigorous multipole analysis of the recent γp -> π^{0}p cross section measurement is presented. The data were taken using the photon spectrometer TAPS at the tagged photon beam of the Mainz microtron. The s and p wave multipoles were extracted using minimal model assumptions. The predicted unitary cusp for the s wave multipole E_{0+} due to the two step γp -> π^{+}n -> π^{0}p reaction was observed. The results are consistent with one loop chiral perturbation theory calculations for which three low energy constants have been determined by a fit to the data. The uncertainties in the analysis and the need for polarization observables are discussed.
dc.description22 pages, 10 figures, 2 tables. Uses LaTex 2e (will not work with previous versions). This paper is also available via an anonymous ftp site ftp://marie.mit.edu/pub/bernstein/ Submitted to Phys. Rev. C
dc.identifierhttps://arxiv.org/abs/nucl-ex/9610005
dc.identifierhttp://arxiv.org/abs/nucl-ex/9610005
dc.identifierPhys.Rev.C55:1509-1516,1997
dc.identifierdoi:10.1103/PhysRevC.55.1509
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/192224
dc.subjectNuclear Experiment
dc.subjectHigh Energy Physics - Experiment
dc.subjectHigh Energy Physics - Phenomenology
dc.titleObservation of a unitary cusp in the threshold γp -> π^{0}p reaction
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