Search for active-sterile neutrino mixing using neutral-current interactions in NOvA
NOvA Collaboration, P. Adamson, L. Aliaga, D. Ambrose, N. Anfimov, A. Antoshkin, E. Arrieta-Diaz, K. Augsten, A. Aurisano, C. Backhouse, M. Baird, B. A. Bambah,… 展开作者
NOvA Collaboration, P. Adamson, L. Aliaga, D. Ambrose, N. Anfimov, A. Antoshkin, E. Arrieta-Diaz, K. Augsten, A. Aurisano, C. Backhouse, M. Baird, B. A. Bambah, K. Bays, B. Behera, S. Bending, R. Bernstein, V. Bhatnagar, B. Bhuyan, J. Bian, T. Blackburn, A. Bolshakova, C. Bromberg, J. Brown, G. Brunetti, N. Buchanan, A. Butkevich, V. Bychkov, M. Campbell, E. Catano-Mur, S. Childress, B. C. Choudhary, B. Chowdhury, T. E. Coan, J. A. B. Coelho, M. Colo, J. Cooper, L. Corwin, L. Cremonesi, D. Cronin-Hennessy, G. S. Davies, J. P. Davies, P. F. Derwent, R. Dharmapalan, P. Ding, Z. Djurcic, E. C. Dukes, H. Duyang, S. Edayath, R. Ehrlich, G. J. Feldman, M. J. Frank, M. Gabrielyan, H. R. Gallagher, S. Germani, T. Ghosh, A. Giri, R. A. Gomes, M. C. Goodman, V. Grichine, M. Groh, R. Group, D. Grover, B. Guo, A. Habig, J. Hartnell, R. Hatcher, A. Hatzikoutelis, K. Heller, A. Himmel, A. Holin, B. Howard, J. Hylen, F. Jediny, M. Judah, G. K. Kafka, D. Kalra, S. M. S. Kasahara, S. Kasetti, R. Keloth, L. Kolupaeva, S. Kotelnikov, I. Kourbanis, A. Kreymer, A. Kumar, S. Kurbanov, T. Lackey, K. Lang, W. M. Lee, S. Lin, M. Lokajicek, J. Lozier, S. Luchuk, K. Maan, S. Magill, W. A. Mann, M. L. Marshak, K. Matera, V. Matveev, D. P. Méndez, M. D. Messier, H. Meyer, T. Miao, W. H. Miller, S. R. Mishra, R. Mohanta, A. Moren, L. Mualem, M. Muether, S. Mufson, R. Murphy, J. Musser, J. K. Nelson, R. Nichol, E. Niner, A. Norman, T. Nosek, Y. Oksuzian, A. Olshevskiy, T. Olson, J. Paley, R. B. Patterson, G. Pawloski, D. Pershey, O. Petrova, R. Petti, S. Phan-Budd, R. K. Plunkett, R. Poling, B. Potukuchi, C. Principato, F. Psihas, A. Radovic, R. A. Rameika, B. Rebel, B. Reed, D. Rocco, P. Rojas, V. Ryabov, K. Sachdev, P. Sail, O. Samoylov, M. C. Sanchez, R. Schroeter, J. Sepulveda-Quiroz, P. Shanahan, A. Sheshukov, J. Singh, J. Singh, P. Singh, V. Singh, J. Smolik, N. Solomey, E. Song, A. Sousa, K. Soustruznik, M. Strait, L. Suter, R. L. Talaga, P. Tas, R. B. Thayyullathil, J. Thomas, X. Tian, S. C. Tognini, J. Tripathi, A. Tsaris, J. Urheim, P. Vahle, J. Vasel, L. Vinton, A. Vold, T. Vrba, B. Wang, M. Wetstein, D. Whittington, S. G. Wojcicki, J. Wolcott, N. Yadav, S. Yang, J. Zalesak, B. Zamorano, R. Zwaska
We report results from the first search for sterile neutrinos mixing with active neutrinos through a reduction in the rate of neutral-current interactions over a baseline of 810\,km between the NOvA detectors. Analyzing a 14-kton detector equivalent exposure of 6.05$\times$10$^{20}$ protons-on-target in the NuMI beam at Fermilab, we observe 95 neutral-current candidates at the Far Detector compared with $83.5 \pm 9.7 \mbox{(stat.)} \pm 9.4 \mbox{(syst.)}$ events predicted assuming mixing only occurs between active neutrino species. No evidence for $ν_μ \rightarrow ν_{s}$ transitions is found. Interpreting these results within a 3+1 model, we place constraints on the mixing angles $θ_{24}<20.8^{\circ}$ and $θ_{34}<31.2^{\circ}$ at the 90% C.L. for $0.05~eV^2\leq Δm^2_{41}\leq 0.5~eV^2$, the range of mass splittings that produce no significant oscillations over the Near Detector baseline.
NOvA Dual-Baseline Search for Active-to-Sterile Neutrino Oscillations using Neutrino- and Antineutrino-Enriched Samples
Erciyes University（埃尔奇耶斯大学）；Universidad del Atlantico（大西洋大学）；University of Mississippi（密西西比大学）；Fermi National Accelerator Laboratory（费米国家加速器实验室）；Joint Institute for Nuclear Research（联合核研究所）；Universidad del Magdalena（马格达莱纳大学）；University of Sussex（萨塞克斯大学）；University of Cincinnati（辛辛那提大学）；University of California at Irvine（加州大学尔湾分校）；University of Hyderabad（海得拉巴大学）
Measuring Active-to-Sterile Neutrino Oscillations with Neutral Current Coherent Neutrino-Nucleus Scattering
轻无菌中微子已经被引入，作为$Δm^2 \sim 1$ eV $^2$处的许多振荡信号的解释。在相对较短的基线上的中微子振荡提供了对这些可能的新状态的探测。本文描述了一个基于加速器的实验，利用中性流相干中微子-核散射来严格搜索活跃到无菌的中微子振荡。因此，这个实验可以明确地确定无菌中微子的存在，并对它们的混合参数提供限制。基于回旋加速器的质子束可以被引导到多个目标，产生低能π介子和μ介子衰变静止中微子源，与单个检测器的距离可变。两种类型的探测器被认为是：基于锗的探测器的灵感来自CDMS的设计和液氩探测器的灵感来自拟议的CLEAR实验。
Measurement of $π^0$ Production in $\barν_μ$ Charged-Current Interactions in the NOvA Near Detector
Erciyes University（埃尔齐耶斯大学）；Universidad del Atlantico（大西洋大学）；University of Mississippi（密西西比大学）；Fermi National Accelerator Laboratory（费米国家加速器实验室）；Joint Institute for Nuclear Research（苏联联合核研究所）；Universidad del Magdalena（马格达莱纳大学）；University of Sussex（萨塞克斯大学）；University of Cincinnati（辛辛那提大学）；Indiana University（印第安纳大学）；Iowa State University（爱荷华州立大学）；University of California at Irvine（加州大学尔湾分校）；University of Hyderabad（海得拉巴大学）
Search for active-sterile antineutrino mixing using neutral-current interactions with the NOvA experiment
这封信报告的结果，从第一个长基线搜索无菌反中微子混合在加速器为基础的反中微子为主的光束。在两个NOvA探测器，在距离1公里和810公里的光束源，中性电流相互作用的速率进行了分析，使用曝光的$12.51\times10^{20}$质子对目标从NuMI光束在费米实验室运行在反中微子模式。在远探测器处观察到中性电流候选者的总共$121$，与预测的$122\pm11$（统计）相比，$\pm15$（系统）假设在三种活性风味剂之间混合。没有观察到$\barν_μ\rightarrow\barν_{s}$振荡的证据。在3+1模型中解释该结果，在90% C. L.处对混合角$θ_{24} < 25^{\circ}$和$θ_{34} < 32^{\circ}$施加约束。对于$0.05$ eV $^{2} \leq Δm^{2}_{41} \leq 0.5$ eV $^{2}$，指在近检测器处不产生显著振荡的质量分裂范围。这是使用长基线加速器反中微子设定的第一个3+1置信限。
Active to sterile neutrino mixing limits from neutral-current interactions in MINOS
结果报告从搜索活跃到无菌中微子振荡的MINOS长基线实验中，中性电流中微子相互作用的观察的基础上，从暴露于NuMI中微子束的$7.07\times10^{20}$质子的目标。在远检测器中观察到总共802个中性电流事件候选者，与三种活性风味之间的振荡的预期数量$754\pm28\rm{(stat.)}\pm{37}\rm{(syst.)}$相比。在90% C. L.时，发现消失的\numu中可能转变为$ν_s$的部分$f_s$小于22%。
Sterile Neutrino Dark Matter Cries for GeV Heavy Neutral Leptons
Université catholique de Louvain（天主教鲁汶大学）；Technische Universität München（慕尼黑工业大学）；University of Tokyo（东京大学）；University of Zagreb（萨格勒布大学）；École Polytechnique Fédérale de Lausanne (EPFL)（洛桑联邦理工学院）；University of Copenhagen（哥本哈根大学）
