在大型强子对撞机上利用FASER首次直接观测对撞机中微子

First Direct Observation of Collider Neutrinos with FASER at the LHC.

作者信息

Abreu Henso, Anders John, Antel Claire, Ariga Akitaka, Ariga Tomoko, Atkinson Jeremy, Bernlochner Florian U, Blesgen Tobias, Boeckh Tobias, Boyd Jamie, Brenner Lydia, Cadoux Franck, Casper David W, Cavanagh Charlotte, Chen Xin, Coccaro Andrea, Desai Ansh, Dmitrievsky Sergey, D'Onofrio Monica, Favre Yannick, Fellers Deion, Feng Jonathan L, Fenoglio Carlo Alberto, Ferrere Didier, Gibson Stephen, Gonzalez-Sevilla Sergio, Gornushkin Yuri, Gwilliam Carl, Hayakawa Daiki, Hsu Shih-Chieh, Hu Zhen, Iacobucci Giuseppe, Inada Tomohiro, Jakobsen Sune, Joos Hans, Kajomovitz Enrique, Kawahara Hiroaki, Keyken Alex, Kling Felix, Köck Daniela, Kose Umut, Kotitsa Rafaella, Kuehn Susanne, Lefebvre Helena, Levinson Lorne, Li Ke, Liu Jinfeng, MacDonald Jack, Magliocca Chiara, Martinelli Fulvio, McFayden Josh, Milanesio Matteo, Mladenov Dimitar, Moretti Théo, Munker Magdalena, Nakamura Mitsuhiro, Nakano Toshiyuki, Nessi Marzio, Neuhaus Friedemann, Nevay Laurie, Otono Hidetoshi, Pang Hao, Paolozzi Lorenzo, Petersen Brian, Pietropaolo Francesco, Prim Markus, Queitsch-Maitland Michaela, Resnati Filippo, Rokujo Hiroki, Ruiz-Choliz Elisa, Sabater-Iglesias Jorge, Sato Osamu, Scampoli Paola, Schmieden Kristof, Schott Matthias, Sfyrla Anna, Shively Savannah, Takubo Yosuke, Tarannum Noshin, Theiner Ondrej, Torrence Eric, Tufanli Serhan, Vasina Svetlana, Vormwald Benedikt, Wang Di, Welch Eli, Zambito Stefano

机构信息

Department of Physics and Astronomy, Technion-Israel Institute of Technology, Haifa 32000, Israel.

CERN, CH-1211 Geneva 23, Switzerland.

出版信息

Phys Rev Lett. 2023 Jul 21;131(3):031801. doi: 10.1103/PhysRevLett.131.031801.

DOI:10.1103/PhysRevLett.131.031801

PMID:37540863

Abstract

We report the first direct observation of neutrino interactions at a particle collider experiment. Neutrino candidate events are identified in a 13.6 TeV center-of-mass energy pp collision dataset of 35.4 fb^{-1} using the active electronic components of the FASER detector at the Large Hadron Collider. The candidates are required to have a track propagating through the entire length of the FASER detector and be consistent with a muon neutrino charged-current interaction. We infer 153_{-13}^{+12} neutrino interactions with a significance of 16 standard deviations above the background-only hypothesis. These events are consistent with the characteristics expected from neutrino interactions in terms of secondary particle production and spatial distribution, and they imply the observation of both neutrinos and anti-neutrinos with an incident neutrino energy of significantly above 200 GeV.

摘要

我们报告了在粒子对撞机实验中对中微子相互作用的首次直接观测。利用大型强子对撞机上FASER探测器的有源电子元件，在质心能量为13.6 TeV、积分亮度为35.4 fb⁻¹的质子-质子碰撞数据集中识别出中微子候选事例。候选事例要求有一条径迹贯穿FASER探测器的全长，并且与μ子中微子带电流相互作用相符。我们推断有153₋₁₃⁺¹₂个中微子相互作用，其显著性比仅基于本底的假设高出16个标准差。这些事例在次级粒子产生和空间分布方面与中微子相互作用预期的特征相符，并且意味着观测到了入射中微子能量显著高于200 GeV的中微子和反中微子。