Improved global fit to Non-Standard neutrino Interactions using COHERENT energy and timing data
Pilar Coloma (Instituto de F́ısica Corpuscular, Universitat de València and CSIC, Edificio Institutos de Investigación, Calle Catedrático José Beltrán 2, Valencia, E-46980, Spain); Ivan Esteban (Departament de Física Quàntica i Astrofísica and Institut de Ciències del Cosmos, Universitat de Barcelona, Diagonal 647, Barcelona, E-08028, Spain); M.C. Gonzalez-Garcia (Departament de Física Quàntica i Astrofísica and Institut de Ciències del Cosmos, Universitat de Barcelona, Diagonal 647, Barcelona, E-08028, Spain, Institució Catalana de Recerca i Estudis Avançats (ICREA), Pg. Lluis Companys 23, Barcelona, E-08010, Spain, C.N. Yang Institute for Theoretical Physics, Stony Brook University, Stony Brook, NY, 11794-3840, USA); Michele Maltoni (Instituto de Física Teórica UAM/CSIC, Universidad Autónoma de Madrid, Calle de Nicolás Cabrera 13–15, Cantoblanco, Madrid, E-28049, Spain)
We perform a global fit to neutrino oscillation and coherent neutrino-nucleus scattering data, using both timing and energy information from the COHERENT experiment. The results are used to set model-independent bounds on four-fermion effective operators inducing non-standard neutral-current neutrino interactions. We quantify the allowed ranges for their Wilson coefficients, as well as the status of the LMA-D solution, for a wide class of new physics models with arbitrary ratios between the strength of the operators involving up and down quarks. Our results are presented for the COHERENT experiment alone, as well as in combination with the global data from oscillation experiments. We also quantify the dependence of our results for COHERENT with respect to the choice of quenching factor, nuclear form factor, and the treatment of the backgrounds.
