中微子磁矩($ν$ MM)是大质量中微子的重要性质。Xenon 1 T合作组最近观测到的几keV电子反冲的异常过剩可能表明太阳中微子中存在$\sim 2.2\times10^{-11} μ_B$有效中微子磁矩($μ_ν^{eff}$)。因此,必须在不同的实验中进行$ν$ MM检索,以确认或排除此类假设。利用天然中微子源和人工中微子源的电子反冲数据,研究了在锦屏中微子实验上进行4kton有效质量的$ν$ MM测量的可行性。$μ_ν^{eff}$在90% C. L时的敏感性可达$1.2\times10^{-11}μ_B$。太阳中微子的10年数据。除了液体闪烁体中固有的低能背景$^{14}$ C外,我们发现对$ν$ MM的灵敏度与$pp$和$^{85}$ Kr的系统不确定度高度相关。降低系统不确定性($pp$和$^{85}$ Kr)和本征背景($^{14}$ C和$^{85}$ Kr)有助于提高低于这些水平的灵敏度,并达到天体物理学感兴趣的区域。在锦屏中微子探测器上安装了一个3兆居里(MCi)的人工中微子源$^{51}$ Cr,经过55天的实验,它能使$1.1\times10^{-11} μ_B$达到90% C. L.的电子中微子磁矩($μ_{ν_e}$)灵敏度。结合这两种测量,还可以在锦屏探测中微子磁矩的味结构。
英文摘要:
Neutrino magnetic moment ($ν$MM) is an important property of massive neutrinos. The recent anomalous excess at few keV electronic recoils observed by the Xenon1T collaboration might indicate a $\sim 2.2\times10^{-11} μ_B$ effective neutrino magnetic moment ($μ_ν^{eff}$) from solar neutrinos. Therefore, it is essential to carry out the $ν$MM searches at a different experiment to confirm or exclude such hypothesis. We study the feasibility of doing $ν$MM measurement with 4 kton active mass at Jinping neutrino experiment using electron recoil data from both natural and artificial neutrino sources. The sensitivity of $μ_ν^{eff}$ can reach $1.2\times10^{-11}μ_B$ at 90\% C.L. with 10-year data taking of solar neutrinos. Besides the intrinsic low energy background $^{14}$C in the liquid scintillator, we find the sensitivity to $ν$MM is highly correlated with the systematic uncertainties of $pp$ and $^{85}$Kr. Reducing systematic uncertainties ($pp$ and $^{85}$Kr) and the intrinsic background ($^{14}$C and $^{85}$Kr) can help to improve sensitivities below these levels and reach the region of astrophysical interest. With a 3 mega-Curie (MCi) artificial neutrino source $^{51}$Cr installed at Jinping neutrino detector for 55 days, it could give us a sensitivity to the electron neutrino magnetic moment ($μ_{ν_e}$) with $1.1\times10^{-11} μ_B$ at 90\% C.L.. With the combination of those two measurements, the flavor structure of the neutrino magnetic moment can be also probed at Jinping.
Probing Magnetic Moment Operators in $H γ$ Production and $H \to τ^+ τ^- γ$ Rare Decay
带电轻子和夸克的磁矩($a_γ$)和弱磁矩($a_W$)对新物理重共振态的量子效应敏感。在有效场论中,$a_γ$和$a_W$是由两个独立的算符诱导的,因此,人们必须测量$a_γ$和$a_W$来揭示新的物理学。SM费米子的$a_W$是在LEP上测量的。在这项工作中,我们分析了在高亮度大型强子对撞机上的$pp\to H γ$和$gg\to H \to τ^+ τ^- γ$过程中磁和弱磁矩算符的贡献。我们证明了这两个过程可以覆盖大部分的参数空间,不能探测在LEP。
Probing $τ$ lepton dipole moments at future Lepton Colliders
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa(意大利国家核物理研究所比萨分部);Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern(伯尔尼大学理论物理研究所爱因斯坦基础物理中心);Centre for Cosmology, Particle Physics and Phenomenology (CP3), UCLouvain(UCLouvain宇宙学、粒子物理与现象学中心(CP3));Dipartimento di Fisica e Astronomia, Università di Bologna and INFN, Sezione di Bologna(博洛尼亚大学物理与天文系及INFN博洛尼亚分部);CERN, Theoretical Physics Department(欧洲核子研究中心理论物理部);Dipartimento di Fisica e Astronomia ‘G. Galilei’, Università di Padova(帕多瓦大学‘伽利略’物理与天文系);Istituto Nazionale Fisica Nucleare, Sezione di Padova(意大利国家核物理研究所帕多瓦分部)
Probe of Solar Neutrino Magnetic Moments through Spin-Flavor Precession: Resonance Structure and Antineutrino Appearance
Jeonbuk National University(全北国立大学);Harish-Chandra Research Institute(哈里什-昌德拉研究所);Homi Bhabha National Institute(霍米·巴巴国立研究所);Institute for Basic Science(韩国基础科学研究院);Korea Institute for Advanced Study(韩国高等研究院);Kyungpook National University(庆北国立大学)
Probing CP Violation with the Deuteron Electric Dipole Moment
本文分析了4维、5维和6维CP破坏算符(包括θ QCD、夸克的电偶极矩和色电偶极矩、四夸克相互作用和Weinberg算符)诱导的氘核电偶极矩。我们证明,EDM协作的建议,以寻找氘EDM,(1-3)\times 10^{-27} e cm的精度目标,将提供一个改进的灵敏度,这些源的一个-两个数量级相对于现有的界限。我们认为详细的水平,CP-奇相位可以探测内的MSSM。
Probing the anomalous electromagnetic dipole moments of the top quark in $γp$ collision at the LHC, the HL-LHC and the HE-LHC
确定顶夸克的电磁偶极矩是对撞机实验中顶夸克物理计划的重要目标之一。为此,我们讨论了在大型强子对撞机(LHC)、高亮度大型强子对撞机(HL-LHC)和高能大型强子对撞机(HE-LHC)上通过过程$pp\rightarrow p γp \rightarrow p t \bar{t} X$产生顶夸克对来研究顶夸克电、磁偶极矩的敏感性。我们应用纯轻子和半轻子衰变研究末态顶夸克对的产生。此外,我们考虑了系统的不确定性的$0,3\%$和$5\%$。从过程$pp\rightarrow p γp \rightarrow p t \bar{t} X$获得的关于异常$a_{A}$和$a_{V}$偶联的最佳限度是$|a_{A}|=0.0200$和$a_{V}=[-0.9959; 0.0003]$。因此,我们的结果表明,$pp\rightarrow p γp \rightarrow p t \bar{t} X$过程是一个很好的前景探测顶夸克的电和磁偶极矩在HL-LHC和HE-LHC。
Probing CP-violating top-quark dipole moments with tomographic observables
Cornell University(康奈尔大学);Abdus Salam Centre for Theoretical Physics(阿卜杜斯·萨拉姆理论物理中心);Imperial College London(伦敦帝国理工学院);Korea Institute for Advanced Study(韩国高等科学技术院)
Probing exotic phenomena at the interface of nuclear and particle physics with the electric dipole moments of diamagnetic atoms: A unique window to hadronic and semi-leptonic CP violation