利用FASER的乳胶探测器首次在大型强子对撞机上测量νₑ和νμ相互作用截面。

First Measurement of ν_{e} and ν_{μ} Interaction Cross Sections at the LHC with FASER's Emulsion Detector.

作者信息

Abraham Roshan Mammen, Anders John, Antel Claire, Ariga Akitaka, Ariga Tomoko, Atkinson Jeremy, Bernlochner Florian U, Boeckh Tobias, Boyd Jamie, Brenner Lydia, Burger Angela, Cadoux Franck, Cardella Roberto, Casper David W, Cavanagh Charlotte, Chen Xin, Coccaro Andrea, Débieux Stephane, D'Onofrio Monica, Desai Ansh, Dmitrievsky Sergey, Eley Sinead, Favre Yannick, Fellers Deion, Feng Jonathan L, Fenoglio Carlo Alberto, Ferrere Didier, Fieg Max, Filali Wissal, Fujimori Haruhi, Garabaglu Ali, Gibson Stephen, Gonzalez-Sevilla Sergio, Gornushkin Yuri, Gwilliam Carl, Hayakawa Daiki, Hsu Shih-Chieh, Hu Zhen, Iacobucci Giuseppe, Inada Tomohiro, Iodice Luca, Jakobsen Sune, Joos Hans, Kajomovitz Enrique, Kanai Takumi, Kawahara Hiroaki, Keyken Alex, Kling Felix, Köck Daniela, Kontaxakis Pantelis, Kose Umut, Kotitsa Rafaella, Kuehn Susanne, Kugathasan Thanushan, Lefebvre Helena, Levinson Lorne, Li Ke, Liu Jinfeng, Lutz Margaret S, MacDonald Jack, Magliocca Chiara, Martinelli Fulvio, McCoy Lawson, McFayden Josh, Medina Andrea Pizarro, Milanesio Matteo, Moretti Théo, Munker Magdalena, Nakamura Mitsuhiro, Nakano Toshiyuki, Neuhaus Friedemann, Nevay Laurie, Nonaka Motoya, Okui Kazuaki, Ohashi Ken, Otono Hidetoshi, Pang Hao, Paolozzi Lorenzo, Petersen Brian, Prim Markus, Queitsch-Maitland Michaela, Rokujo Hiroki, Ruiz-Choliz Elisa, Rubbia André, Sabater-Iglesias Jorge, Sato Osamu, Scampoli Paola, Schmieden Kristof, Schott Matthias, Sfyrla Anna, Shamim Mansoora, Shively Savannah, Takubo Yosuke, Tarannum Noshin, Theiner Ondrej, Torrence Eric, Vasina Svetlana, Vormwald Benedikt, Wang Di, Wang Yuxiao, Welch Eli, Zahorec Samuel, Zambito Stefano, Zhang Shunliang

机构信息

Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA.

<a href="https://ror.org/01ggx4157">CERN</a>, CH-1211 Geneva 23, Switzerland.

出版信息

Phys Rev Lett. 2024 Jul 12;133(2):021802. doi: 10.1103/PhysRevLett.133.021802.

DOI:10.1103/PhysRevLett.133.021802

PMID:39073961

Abstract

The first results of the study of high-energy electron neutrino (ν_{e}) and muon neutrino (ν_{μ}) charged-current interactions in the FASERν emulsion-tungsten detector of the FASER experiment at the LHC are presented. A 128.8 kg subset of the FASERν volume was analyzed after exposure to 9.5 fb^{-1} of sqrt[s]=13.6 TeV pp data. Four (eight) ν_{e} (ν_{μ}) interaction candidate events are observed with a statistical significance of 5.2σ (5.7σ). This is the first direct observation of ν_{e} interactions at a particle collider and includes the highest-energy ν_{e} and ν_{μ} ever detected from an artificial source. The interaction cross section per nucleon σ/E_{ν} is measured over an energy range of 560-1740 GeV (520-1760 GeV) for ν_{e} (ν_{μ}) to be (1.2_{-0.7}^{+0.8})×10^{-38} cm^{2} GeV^{-1} [(0.5±0.2)×10^{-38} cm^{2} GeV^{-1}], consistent with standard model predictions. These are the first measurements of neutrino interaction cross sections in those energy ranges.

摘要

本文展示了在大型强子对撞机（LHC）的FASER实验的FASERν乳胶-钨探测器中对高能电子中微子（νₑ）和μ子中微子（νμ）带电流相互作用研究的首批结果。在暴露于9.5 fb⁻¹的√s = 13.6 TeV质子-质子数据后，对FASERν体积的一个128.8 kg子集进行了分析。观测到四个（八个）νₑ（νμ）相互作用候选事件，统计显著性为5.2σ（5.7σ）。这是在粒子对撞机上首次直接观测到νₑ相互作用，并且包括了从人工源探测到的能量最高的νₑ和νμ。在560 - 1740 GeV（520 - 1760 GeV）的能量范围内测量了νₑ（νμ）每核子的相互作用截面σ/Eν为（1.2₋₀.₇⁺₀.₈）×10⁻³⁸ cm² GeV⁻¹ [（0.5±0.2）×10⁻³⁸ cm² GeV⁻¹]，与标准模型预测一致。这些是在那些能量范围内对中微子相互作用截面的首次测量。