Low-energy photon production in neutrino neutral-current interactions

Abstract

The search for ${\nu }_{\mu }\to {\nu }_e$ oscillations by the MiniBooNE Collaboration at Fermilab has revealed a low-energy signal which could be due either to electrons produced by ${\nu }_e$ or photons produced by the interaction of the weak neutral current on the target nucleus. One contribution to the latter is a Wess-Zumino-Witten anomaly leading to a term in the Lagrangian proportional to ${\epsilon }^{\mu \nu \kappa \lambda }{Z}_{\mu }{\omega }_{\nu }{F}_{\kappa \lambda }$. This term is normalized with the help of the known rates for the processes $f_1\to \rho \gamma$ and $\tau \to {\nu }_{\tau }{a}_1$. A rate of about 1/4 of that employed in several previous estimates is obtained. As the anomaly term had already been found to play a subdominant role in photon production (e.g., in comparison with $\Delta$ excitation and decay), the present estimate reduces its strength even further.

8 pages, 1 figure. Version with significant further revisions submitted to Phys. Rev. D

References in corpus (10)

• Baryon Number-Induced Chern-Simons Couplings of Vector and Axial-Vector Mesons in Holographic QCD
• Resolution of puzzles from the LSND, KARMEN, and MiniBooNE experiments
• Anomaly mediated neutrino-photon interactions at finite baryon density
• Standard Model Gauging of the WZW Term: Anomalies, Global Currents and pseudo-Chern-Simons Interactions
• Neutrinoproduction of Photons and Pions From Nucleons in a Chiral Effective Field Theory for Nuclei
• On the single photon background to nu_e appearance at MiniBooNE
• Single photon events from neutral current interactions at MiniBooNE
• Can neutrino-induced photon production explain the low energy excess in MiniBooNE?
• Coherent Neutrinoproduction of Photons and Pions in a Chiral Effective Field Theory for Nuclei
• Incoherent Neutrinoproduction of Photons and Pions in a Chiral Effective Field Theory for Nuclei

Cited by in corpus (3)

• Search for neutral-current induced single photon production at the ND280 near detector in T2K
• Neutrino Interactions with Matter and the MiniBooNE anomaly
• Resonance Contributions to Radiative Corrections in Charged-Current Elastic (Anti)Neutrino-Nucleon Scattering at GeV Energies