Four Momentum Transfer Discrepancy in the Charged Current $π^+$ Production in the MiniBooNE: Data vs. Theory

Details Four Momentum Transfer Discrepancy in the Charged Current $π^+$ Production in the MiniBooNE: Data vs. Theory Four Momentum Transfer Discrepancy in the Charged Current $π^+$ Production in the MiniBooNE: Data vs. Theory

2009-09-20

arxiv.org/abs/0909.3659v2

AIP Conf.Proc.1189:243-248,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

Presented at 6th International Workshop on Neutrino-Nucleus Interactions in the Few-GeV Region (NUINT 2009), Sitges, Barcelona

Scientific paper

10.1063/1.3274164

The MiniBooNE experiment has collected what is currently the world's largest sample of neutrino muon charged current single charged pion interactions, roughly 46,000 events. The purity of the CC1pi+ sample is 87% making this the purest event sample observed in the MiniBooNE detector. The average energy of neutrinos producing CC1pi+ interactions in MiniBooNE is about 1 GeV, therefore the study of these events can provide insight into both resonant and coherent pion production processes. In this talk, we will discuss the long-standing discrepancy in four-momentum transfer observed between CC1pi+ data and existing predictions. Several attempts to address this problem will be presented. Specifically, the Rein-Sehgal model has been extended to include muon mass terms for both resonant [Kuzmin et al. and Berger and Sehgal] and coherent production. Using calculations from Graczyk and Sobczyk paper, an updated form for the vector form factor [Lalakulich et al.] has also been adopted. The results of this improved description of CC1pi+ production will be compared to the high statistics MiniBooNE CC1pi+ data and several existing parametrisations of the axial vector form factor.

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