Neutrino-induced coherent pion production off nuclei reexamined

Abstract

It is pointed out that so far all theoretical estimates of coherent pion production off nuclei induced by neutrinos rely on the 'local approximation' well known in photonuclear physics. The effects of dropping this approximation are discussed. It is found that in a plane wave approximation for the pion the local approximation overestimates the coherent neutrino-induced pion production on nuclei.Comment: v3: comments on pion FSI added, minor corrections; version as published in Phys. Rev.

Coherent pion production off nuclei at T2K and MiniBooNE energies revisited

“…In Ref. [14] it is claimed that their neglect, the so called, local approximation, leads to an overestimate of the coherent production cross section that can be as large as a factor of 2 for neutrino energies of 500 MeV. Similar results were obtained in Ref.…”

“…Very recently, the role of nonlocalities in the ∆ momentum has also been investigated [12][13][14][15]. In Ref.…”

Comparison of Models of Neutrino-Nucleus Interactions

“…Effects due to modifications of the A mass and width in the medium, final pion distortion, and nonlocalities in the pion momentum are studied by Amaro, Nieves, and Valverde [58]. A more recent calculation of Leitner, Mosel, and Winkelman [59] point to the role of nonlocalities in the pion production operator in the nuclear medium.…”

The CC1π+to CCQE cross section ratio at accelerator energies

“…Experimental points are the K2K(circle) [12], ANL(square) [20], [21] and MiniBooNE(traingle-up) results [11]. current quasielastic lepton production process, the calculations of Leitner et al [39] and Benhar et al [41] for the charged current incoherent pion production process and with the calculations of Alvarez-Ruso et al [42], Leitner et al [43], Amaro et al [44] and Berger and Sehgal [45] for the charged current coherent pion production process.…”