PublicaciΓ³n: A precision measurement of the πβ‘(π,πβ²β’π)β’π0 reaction at threshold
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2015-05-13
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info:eu-repo/semantics/openAccess
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American Physical Society
Resumen
New results are reported from a measurement of π0 electroproduction near threshold using the πβ‘(π,πβ²β’π)β’π0 reaction. The experiment was designed to determine precisely the energy dependence of π - and π-wave electromagnetic multipoles as a stringent test of the predictions of chiral perturbation theory (ChPT). The data were taken with an electron beam energy of 1192 MeV using a two-spectrometer setup in Hall A at Jefferson Lab. For the first time, complete coverage of the π*π and π*π angles in the πβ’π0 center of mass was obtained for invariant energies above threshold from 0.5 up to 15 MeV. The 4-momentum transfer π2 coverage ranges from 0.05 to 0.155ββ(GeV/π)2 in fine steps. A simple phenomenological analysis of our data shows strong disagreement with π-wave predictions from ChPT for π2>0.07ββ(GeV/π)2, while the π -wave predictions are in reasonable agreement.
DescripciΓ³n
This is an Accepted Manuscript of an article published by American Physical Society in " Physical Review Letters 114(19)", available at: https://doi.org/10.1103/PhysRevLett.114.192503
Este es el manuscrito aceptado del artΓculo publicado por American Physical Society en "Physical Review Letters 114(19)", disponible en lΓnea: https://doi.org/10.1103/PhysRevLett.114.192503
Este es el manuscrito aceptado del artΓculo publicado por American Physical Society en "Physical Review Letters 114(19)", disponible en lΓnea: https://doi.org/10.1103/PhysRevLett.114.192503
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CitaciΓ³n
Chirapatpimol, K & Shabestari, M & Lindgren, Richard & Smith, L & Annand, (et al) (2015). Precision Measurement of the p(e,eβ²p)Ο0 Reaction at Threshold. Physical review letters. 114. 192503.
Centro
Facultades y escuelas::Facultad de Ciencias
Departamento
FΓsica Interdisciplinar