Charge symmetry breaking in dd→He4π0 with WASA-at-COSY

P. Adlarson (Division of Nuclear Physics, Department of Physics and Astronomy, Uppsala University, Box 516, Uppsala, 75120, Sweden) ; W. Augustyniak (Department of Nuclear Physics, National Centre for Nuclear Research, ul. Hoza 69, Warsaw, 00-681, Poland) ; W. Bardan (Institute of Physics, Jagiellonian University, ul. Reymonta 4, Kraków, 30-059, Poland) ; M. Bashkanov (Kepler Center for Astro and Particle Physics, Eberhard Karls University Tübingen, Auf der Morgenstelle 14, Tübingen, 72076, Germany; Physikalisches Institut, Eberhard-Karls-Universität Tübingen, Auf der Morgenstelle 14, Tübingen, 72076, Germany) ; F.S. Bergmann (Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 9, Münster, 48149, Germany) ; et al. - Show all 104 authors

Charge symmetry breaking (CSB) observables are a suitable experimental tool to examine effects induced by quark masses on the nuclear level. Previous high precision data from TRIUMF and IUCF are currently used to develop a consistent description of CSB within the framework of chiral perturbation theory. In this work the experimental studies on the reaction dd→He4π0 have been extended towards higher excess energies in order to provide information on the contribution of p -waves in the final state. For this, an exclusive measurement has been carried out at a beam momentum of pd=1.2 GeV/c using the WASA-at-COSY facility. The total cross section amounts to σtot=(118±18stat±13sys±8ext) pb and first data on the differential cross section are consistent with s -wave pion production.

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      "title": "Charge symmetry breaking in dd\u2192He4\u03c00 with WASA-at-COSY"
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      "value": "Charge symmetry breaking (CSB) observables are a suitable experimental tool to examine effects induced by quark masses on the nuclear level. Previous high precision data from TRIUMF and IUCF are currently used to develop a consistent description of CSB within the framework of chiral perturbation theory. In this work the experimental studies on the reaction dd\u00e2\u0086\u0092He4\u00cf\u00800 have been extended towards higher excess energies in order to provide information on the contribution of p -waves in the final state. For this, an exclusive measurement has been carried out at a beam momentum of pd=1.2\u00c2 GeV/c using the WASA-at-COSY facility. The total cross section amounts to \u00cf\u0083tot=(118\u00c2\u00b118stat\u00c2\u00b113sys\u00c2\u00b18ext)\u00c2 pb and first data on the differential cross section are consistent with s -wave pion production."
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Published on:
16 October 2014
Publisher:
Elsevier
Published in:
Physics Letters B (2014)

Pages 44-49
DOI:
https://doi.org/10.1016/j.physletb.2014.10.029
Copyrights:
The Authors
Licence:
CC-BY-3.0

Fulltext files: