| |
Abstract |
We present a combined analysis of recent CE nu NS data on germanium from two complementary experiments: COHERENT, which uses neutrinos from pion decay at rest, and CONUS+, which detects reactor antineutrinos. Exploiting the complementarity of these two datasets in a joint statistical analysis, we extract the germanium root-mean-square neutron radius and neutron skin with improved precision, disentangling spectral shape distortions from overall normalizations and reducing systematic uncertainties. We also determine the weak mixing angle at low momentum transfer, providing a test of the Standard Model in a less-explored kinematic regime. A key systematic uncertainty in CE nu NS ionization measurements is the nuclear quenching factor; we therefore present our results as a function of variations of the Lindhard model. For the nuclear form factor, we adopt the analytical Klein-Nystrand parametrization and benchmark it against predictions from the large-scale nuclear Shell Model, assessing the impact of nuclear structure uncertainties on our results. Our analysis demonstrates the power of combining datasets across different neutrino sources to maximize sensitivity to both nuclear and electroweak physics. |
|
| |
Address |
[De Romeri, Valentina] Univ Valencia, Inst Fis Corpuscular IF, CSIC, E-46980 Valencia, Spain; [Duque, Laura] Ctr Invest & Estudios Avanzados IPN, Dept Fis, Apartado Postal 14-740, Mexico City 07000, Mexico; [Papoulias, Dimitrios K.] Univ Hamburg, Inst Expt Phys, D-22761 Hamburg, Germany; [Garcia, G. Sanchez] Univ Nacl Autonoma Mexico, Fac Ciencias, Dept Fis, Apartado Postal 70-542, Mexico City 04510, Mexico; [Ternes, Christoph A.] Gran Sasso Sci Inst, Viale F Crispi 7, I-67100 Laquila, Italy; [Ternes, Christoph A.] Ist Nazl Fis Nucleare INFN, Lab Nazl Gran Sasso, I-67100 Laquila, Italy, Email: dimitrios.papoulias@uni-hamburg.de; |
|
