Single pion production (SPP) in neutrino interactions with nucleons

Our project focused on improving the theoretical description of single pion production (SPP) induced by neutrino–nucleon scattering, a process that plays an important role in measurements of neutrino oscillation parameters. We developed a new scheme for modeling resonance form factors within the Rein–Sehgal model, together with an algorithm that consistently incorporates lepton-mass effects. These results were subsequently implemented in several experimental Monte Carlo generators, including NEUT.

We also carried out a detailed analysis of the ANL and BNL data on SPP and showed, for the first time, that the two data sets are mutually consistent, contrary to earlier claims in the literature. In addition, we obtained new parametrizations of the weak nucleon–Delta excitation transition matrix element, further improving the theoretical framework used in neutrino-interaction studies.

Funding: Works on theoretical modeling neutrino-nucleus interactionsi, Polish Ministry of Science Grant No. 3735/H03/2006/31.
T2K experimenti, Polish Ministry of Science and Higher Education Project: 35/N-T2K/2007/0 (No. DWM/57/T2K/2007).
Prace teoretyczne nad oddziaływaniami neutrin z nukleonami i jądrami atomowymi, NCN grant No. 3684/B/H03/2010/39; N N202 368439.

References:
Phys. Rev. D 77, 053001 (2008)
Phys. Rev. D 77, 053003 (2008)
Phys. Rev. D 80, 093001 (2009)
PoS EPS-HEP2009 (2009) 286
AIP Conf.Proc. 1405, 1, 134 (2011) Phys. Rev. D 90, 093001 (2014)

Collaborators: Jan Sobczyk, Danuta Kiełczewska, Paweł Przewłocki, Jakub Żmuda