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arXiv 2004.07828hep-exhep-phphysics.ins-det
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LHC中微子实验物理势的进一步研究

Further studies on the physics potential of an experiment using LHC neutrinos

N. Beni, M. Brucoli, V. Cafaro, F. Cerutti, G. M. Dallavalle, S. Danzeca, A. DeRoeck, A. De Rujula, D. Fasanella, V. Giordano, C. Guandalini, A. Ioannisyan, D. … 展开作者

N. Beni, M. Brucoli, V. Cafaro, F. Cerutti, G. M. Dallavalle, S. Danzeca, A. DeRoeck, A. De Rujula, D. Fasanella, V. Giordano, C. Guandalini, A. Ioannisyan, D. Lazic, A. Margotti, S. Lo Meo, F. L. Navarria, L. Patrizii, T. Rovelli, M. Sabate-Gilarte, F. Sanchez Galan, P. Santos Diaz, G. Sirri, Z. Szillasi, C. -E. Wulz

摘要:

我们讨论了一个实验,调查中微子物理在大型强子对撞机在运行3,重点是τ味。正如我们之前的论文[arXiv:1903.06564v1]所述,探测器可以安装在退役的TI 18隧道中,在ATLAS洞穴下游约480米处,在LHC弧的第一个弯曲偶极子之后。在该位置,从交互点IP 1到TI 18的光束视线的延长线穿过约100 m的岩石。探测器拦截强烈的中微子通量,产生的LHC光束在IP 1碰撞,在大的赝快度η,中微子能量可以超过TeV。本文的重点是优化全球功能的实验,如探测器的质量和接受。由于中微子-核子相互作用的截面几乎与能量成线性增长,探测器可以很轻,但仍然可以收集相当多的中微子事件样本;在本研究中,它的重量不到3吨。探测器的位置偏离束轴,略高于LHC束从直线段的理想延伸,覆盖7.4 < eta < 9.2。在这种结构中,高能量(0.5-1.5 TeV及以上)的通量被发现是由直接来自IP 1的中微子主导的,主要来自粲衰变,其中约50%是电子中微子,约5%是τ中微子。通过嵌入LHC光学系统的模拟研究了π介子和K介子衰变对μ介子中微子通量的贡献,发现在高能量下很小。上述研究表明,在运行3中,使用150 /fb的LHC亮度,实验可以记录几千个非常高能量的中微子带电电流相互作用和超过50个τ中微子带电电流事件。

英文摘要:

We discuss an experiment to investigate neutrino physics at the LHC in Run 3, with emphasis on tau flavour. As described in our previous paper [arXiv:1903.06564v1], the detector can be installed in the decommissioned TI18 tunnel, about 480 m downstream the ATLAS cavern, after the first bending dipoles of the LHC arc. In that location, the prolongation of the beam Line-of-Sight from Interaction Point IP1 to TI18 traverses about 100 m of rock. The detector intercepts the intense neutrino flux, generated by the LHC beams colliding in IP1, at large pseudorapidity eta, where neutrino energies can exceed a TeV. This paper focuses on optimizing global features of the experiment, like detector mass and acceptance. Since the neutrino-nucleon interaction cross section grows almost linearly with energy, the detector can be light and still collect a considerable sample of neutrino events; in the present study it weighs less than 3 tons. The detector is positioned off the beam axis, slightly above the ideal prolongation of the LHC beam from the straight section, covering 7.4 < eta < 9.2. In this configuration, the flux at high energies (0.5-1.5 TeV and beyond) is found to be dominated by neutrinos originating directly from IP1, mostly from charm decays, of which about 50% are electron neutrinos and about 5% are tau neutrinos. The contribution of pion and kaon decays to the muon neutrino flux is studied by means of simulations that embed the LHC optics and found small at high energies. The above studies indicate that with 150 /fb of delivered LHC luminosity in Run 3 the experiment can record a few thousand very high energy neutrino charged current interactions and over 50 tau neutrino charged current events.

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