TY  - JOUR
AU  - Wang, E.
AU  - Alvarez-Ruso, L.
AU  - Nieves, J.
PY  - 2014
DA  - 2014//
TI  - Photon emission in neutral-current interactions at intermediate energies
T2  - Phys. Rev. C
JO  - Physical Review C
SP  - 015503
EP  - 21pp
VL  - 89
IS  - 1
PB  - Amer Physical Soc
AB  - Neutral-current photon emission reactions with nucleons and nuclei are studied. These processes are important backgrounds for nu(mu) -> nu(e) ((nu) over bar (mu) -> (nu) over bar (e)) appearance oscillation experiments where electromagnetic showers instigated by electrons (positrons) and photons are not distinguishable. At intermediate energies, these reactions are dominated by the weak excitation of the Delta(1232) resonance and its subsequent decay into N gamma. There are also nonresonant contributions that, close to threshold, are fully determined by the effective chiral Lagrangian of strong interactions. In addition, we have also included mechanisms mediated by nucleon excitations (N*) from the second resonance region above the Delta(1232). From these states, the contribution of the D-13 N*(1520) turns out to be sizable for (anti) neutrino energies above 1.5 GeV. We have extended the model to nuclear targets taking into account Pauli blocking, Fermi motion, and the in-medium Delta resonance broadening. We present our predictions for both the incoherent and coherent channels, showing the relevance of the nuclear corrections. We also discuss the target mass dependence of the cross sections. This study is important to reduce systematic effects in neutrino oscillation experiments.
SN  - 0556-2813
UR  - http://arxiv.org/abs/1311.2151
UR  - https://doi.org/10.1103/PhysRevC.89.015503
DO  - 10.1103/PhysRevC.89.015503
LA  - English
N1  - WOS:000332159800010
ID  - Wang_etal2014
ER  -