Akimov D, An P, Awe C, Barbeau P S, Becker B, Belov V, Bernardi I, Blackston M A, Bock C, Bolozdynya A, Browning J, Cabrera-Palmer B, Chernyak D, Conley E, Daughhetee J, Detwiler J, Ding K, Durand M R, Efremenko Y, Elliott S R, Fabris L, Febbraro M, Gallo Rosso A, Galindo-Uribarri A, Green M P, Heath M R, Hedges S, Hoang D, Hughes M, Johnson T, Khromov A, Konovalov A, Kozlova E, Kumpan A, Li L, Link J M, Liu J, Mann K, Markoff D M, Mastroberti J, Mueller P E, Newby J, Parno D S, Penttila S I, Pershey D, Rapp R, Ray H, Raybern J, Razuvaeva O, Reyna D, Rich G C, Ross J, Rudik D, Runge J, Salvat D J, Salyapongse A M, Scholberg K, Shakirov A, Simakov G, Sinev G, Snow W M, Sosnovstsev V, Suh B, Tayloe R, Tellez-Giron-Flores K, Tolstukhin I, Ujah E, Vanderwerp J, Varner R L, Virtue C J, Visser G, Wongjirad T, Yen Y-R, Yoo J, Yu C-H, Zettlemoyer J
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow 115409, Russian Federation.
Department of Physics, Duke University, Durham, North Carolina 27708, USA.
Phys Rev Lett. 2022 Aug 19;129(8):081801. doi: 10.1103/PhysRevLett.129.081801.
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} cm^{2}, 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 sin^{2}θ_{W}=0.220_{-0.026}^{+0.028} at Q^{2}≈(50 MeV)^{2}.
我们在橡树岭国家实验室散裂中子源产生的高通量中微子束中，使用碘化铯[钠]闪烁晶体测量了相干弹性中微子-原子核散射（CEvNS）的截面。在探测器退役前收集的新数据使自首次通过该探测器观测到CEvNS以来的数据集增加了一倍多。通过更新的猝灭模型，系统不确定性也有所降低，从而提高了精度。通过这些分析改进，COHERENT合作组确定截面为(165_{-25}^{+30})×10^{-40} 平方厘米，与标准模型一致，给出了迄今为止对CEvNS最精确的测量。利用中微子束的时间结构比较了不同中微子味散射产生的CEvNS截面。这一结果在测试轻子味普适性的同时，对中微子非标准相互作用施加了主要限制，并在Q^{2}≈(50兆电子伏特)^{2}时测量出弱混合角为sin^{2}θ_{W}=0.220_{-0.026}^{+0.028} 。
