Observation of Collider Neutrinos without Final State Muons with the SND@LHC Experiment

Abbaneo, D.; Ahmad, S.; Albanese, R.; Alexandrov, A.; Alicante, F.; Androsov, K.; Anokhina, A.; Asada, T.; Asawatangtrakuldee, C.; Ayala Torres, M.A.; Battilana, C.; Bay, A.; Bertocco, A.; Betancourt, C.; Bick, D.; Biswas, R.; Blanco Castro, A.; Boccia, V.; Bogomilov, M.; Bonacorsi, D.; Bonivento, W.M.; Bordalo, P.; Boyarsky, A.; Buontempo, S.; Cafaro, V.; Campanelli, M.; Camporesi, T.; Canale, V.; Centanni, D.; Cerutti, F.; Chernyavskiy, M.; Choi, K-Y; Cholak, S.; Cindolo, F.; Climescu, M.; Conaboy, A.P.; Crupano, A.; Dallavalle, G.M.; Davino, D.; de Bryas, P.T.; De Lellis, G.; De Magistris, M.; De Roeck, A.; De Rújula, A.; De Serio, M.; De Simone, D.; Di Crescenzo, A.; Di Ferdinando, D.; Dinc, C.; Donà, R.; Durhan, O.; Fasanella, D.; Fedotovs, F.; Ferrillo, M.; Ferro-Luzzi, M.; Fini, R.A.; Fiorillo, A.; Fresa, R.; Funk, W.; Garay Walls, F.M.; Giordano, V.; Golovatiuk, A.; Golutvin, A.; Graverini, E.; Guler, A.M.; Guliaeva, V.; Haefeli, G.J.; Hagner, C.; Helo Herrera, J.C.; van Herwijnen, E.; Iengo, P.; Ilieva, S.; Infantino, A.; Iuliano, A.; Jacobsson, R.; Kamiscioglu, C.; Kauniskangas, A.M.; Khalikov, E.; Kim, S.H.; Kim, Y.G.; Klioutchnikov, G.; Komatsu, M.; Konovalova, N.; Kuleshov, S.; Krzempek, L.; Lacker, H.M.; Lantwin, O.; Lasagni Manghi, F.; Lauria, A.; Lee, K.Y.; Lee, K.S.; Loschiavo, V.P.; Margiotta, A.; Mascellani, A.; Mei, F.; Miano, A.; Mikulenko, A.; Montesi, M.C.; Navarria, F.L.; Nuntiyakul, W.; Ogawa, S.; Okateva, N.; Ovchynnikov, M.; Paggi, G.; Park, B.D.; Pastore, A.; Perrotta, A.; Podgrudkov, D.; Polukhina, N.; Primavera, F.; Prota, A.; Quercia, A.; Ramos, S.; Reghunath, A.; Roganova, T.; Ronchetti, F.; Rovelli, T.; Ruchayskiy, O.; Ruf, T.; Sabate Gilarte, M.; Samoilov, M.; Scalera, V.; Schmidt-Parzefall, W.; Schneider, O.; Sekhniaidze, G.; Serra, N.; Shaposhnikov, M.; Shevchenko, V.; Shchedrina, T.; Shchutska, L.; Shibuya, H.; Simone, S.; Sirri, G.; Soares, G.; Sohn, J.Y.; Soto Sandoval, O.J.; Spurio, M.; Starkov, N.; Steggemann, J.; Timiryasov, I.; Tioukov, V.; Tramontano, F.; Trippl, C.; Ursov, E.; Ustyuzhanin, A.; Vankova-Kirilova, G.; Vasquez, G.; Verguilov, V.; Viegas Guerreiro Leonardo, N.; Vilela, C.; Visone, C.; Wanke, R.; Yaman, E.; Yang, Z.; Yazici, C.; Yoon, C.S.; Zaffaroni, E.; Zamora Saa, J.

doi:10.1103/r2qy-9hft

Observation of Collider Neutrinos without Final State Muons with the SND@LHC Experiment

Abbaneo D., Ahmad S., Albanese R., Alexandrov A., Alicante F., Androsov K., ...More

Physical review letters, vol.134, no.23, pp.231802, 2025 (SCI-Expanded)

Publication Type: Article / Article
Volume: 134 Issue: 23
Publication Date: 2025
Doi Number: 10.1103/r2qy-9hft
Journal Name: Physical review letters
Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Compendex, INSPEC, zbMATH, DIALNET, Nature Index
Page Numbers: pp.231802
Middle East Technical University Affiliated: Yes

Abstract

We report the observation of neutrino interactions without final state muons at the LHC, with a significance of 6.4σ. A dataset of proton-proton collisions at sqrt[s]=13.6 TeV collected by SND@LHC in 2022 and 2023 is used, corresponding to an integrated luminosity of 68.6 fb^{-1}. Neutrino interactions without a reconstructed muon are selected, resulting in an event sample consisting mainly of neutral-current and electron neutrino charged-current interactions in the detector. After selection cuts, 9 neutrino interaction candidate events are observed with an estimated background of 0.32 events.