2022 journal article

Measurement of the Coherent Elastic Neutrino-Nucleus Scattering Cross Section on CsI by COHERENT


By: D. Akimov, P. An, C. Awe, P. Barbeau, B. Becker, V. Belov, I. Bernardi, M. Blackston ...

Source: Web Of Science
Added: October 31, 2022

We measured the cross section of coherent elastic neutrino-nucleus scattering (CEvNS) using a CsI[Na] scintillating crystal in a high flux of neutrinos produced at the Spallation Neutron Source at Oak Ridge National Laboratory. New data collected before detector decommissioning have more than doubled the dataset since the first observation of CEvNS, achieved with this detector. Systematic uncertainties have also been reduced with an updated quenching model, allowing for improved precision. With these analysis improvements, the COHERENT Collaboration determined the cross section to be (165−25+30)×10−40 cm2, consistent with the standard model, giving the most precise measurement of CEvNS yet. The timing structure of the neutrino beam has been exploited to compare the CEvNS cross section from scattering of different neutrino flavors. This result places leading constraints on neutrino nonstandard interactions while testing lepton flavor universality and measures the weak mixing angle as sin2θW=0.220−0.026+0.028 at Q2≈(50 MeV)2.Received 2 June 2022Revised 17 July 2022Accepted 3 August 2022DOI:https://doi.org/10.1103/PhysRevLett.129.081801Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasElectroweak interactionNeutrino interactionsTechniquesNeutrino detectorsParticles & Fields