Weak pion production off the nucleon
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Weak pion production off the nucleon

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Weak pion production off the nucleon

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dc.contributor.author Hernández Gajate, Eliecer
dc.contributor.author Nieves Pamplona, Juan Miguel
dc.contributor.author Valverde Hermosilla, Manuel
dc.date.accessioned 2014-10-22T10:03:47Z
dc.date.available 2014-10-22T10:03:47Z
dc.date.issued 2007
dc.identifier.uri http://hdl.handle.net/10550/39278
dc.description.abstract We develop a model for the weak pion production off the nucleon, which besides the delta pole mechanism [weak excitation of the Delta(1232) resonance and its subsequent decay into N pi], includes also some background terms required by chiral symmetry. We refit the C-5(A)(q(2)) form factor to the flux-averaged nu(mu)p ->mu(-)p pi(+) ANL q(2)-differential cross section data, finding a substantially smaller contribution of the delta pole mechanism than traditionally assumed in the literature. Within this scheme, we calculate several differential and integrated cross sections, including pion angular distributions, induced by neutrinos and antineutrinos and driven both by charged and neutral currents. In all cases we find that the background terms produce quite significant effects, and that they lead to an overall improved description of the data, as compared to the case where only the delta pole mechanism is considered. We also show that the interference between the delta pole and the background terms produces parity-violating contributions to the pion angular differential cross section, which are intimately linked to T-odd correlations in the contraction between the leptonic and hadronic tensors. However, these latter correlations do not imply a genuine violation of time-reversal invariance because of the existence of strong final state interaction effects.
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2007, vol. 76, num. 3, p. 033005
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Hernández Gajate, Eliecer Nieves Pamplona, Juan Miguel Valverde Hermosilla, Manuel 2007 Weak pion production off the nucleon Physical Review D 76 3 033005
dc.subject Física
dc.title Weak pion production off the nucleon
dc.type info:eu-repo/semantics/article
dc.date.updated 2014-10-22T10:03:47Z
dc.identifier.doi http://dx.doi.org/10.1103/PhysRevD.76.033005
dc.identifier.idgrec 068568

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