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arXiv · 2412.03186

First Measurement of the Muon Neutrino Interaction Cross Section and Flux as a Function of Energy at the LHC with FASER

FASER Collaboration·Roshan Mammen Abraham·Xiaocong Ai·John Anders·Claire Antel·Akitaka Ariga·Tomoko Ariga·Jeremy Atkinson·Florian U. Bernlochner·Tobias Boeckh·Jamie Boyd·Lydia Brenner·Angela Burger·Franck Cadoux·Roberto Cardella·David W. Casper·Charlotte Cavanagh·Xin Chen·Dhruv Chouhan·Andrea Coccaro·Stephane Débieux·Monica D'Onofrio·Ansh Desai·Sergey Dmitrievsky·Radu Dobre·Sinead Eley·Yannick Favre·Deion Fellers·Jonathan L. Feng·Carlo Alberto Fenoglio·Didier Ferrere·Max Fieg·Wissal Filali·Elena Firu·Edward Galantay·Ali Garabaglu·Stephen Gibson·Sergio Gonzalez-Sevilla·Yuri Gornushkin·Carl Gwilliam·Daiki Hayakawa·Michael Holzbock·Shih-Chieh Hsu·Zhen Hu·Giuseppe Iacobucci·Tomohiro Inada·Luca Iodice·Sune Jakobsen·Hans Joos·Enrique Kajomovitz·Hiroaki Kawahara·Alex Keyken·Felix Kling·Daniela Köck·Pantelis Kontaxakis·Umut Kose·Rafaella Kotitsa·Susanne Kuehn·Thanushan Kugathasan·Lorne Levinson·Ke Li·Jinfeng Liu·Yi Liu·Margaret S. Lutz·Jack MacDonald·Chiara Magliocca·Toni Mäkelä·Lawson McCoy·Josh McFayden·Andrea Pizarro Medina·Matteo Milanesio·Théo Moretti·Mitsuhiro Nakamura·Toshiyuki Nakano·Laurie Nevay·Ken Ohashi·Hidetoshi Otono·Hao Pang·Lorenzo Paolozzi·Pawan Pawan·Brian Petersen·Titi Preda·Markus Prim·Michaela Queitsch-Maitland·Hiroki Rokujo·André Rubbia·Jorge Sabater-Iglesias·Osamu Sato·Paola Scampoli·Kristof Schmieden·Matthias Schott·Anna Sfyrla·Davide Sgalaberna·Mansoora Shamim·Savannah Shively·Yosuke Takubo·Noshin Tarannum·Ondrej Theiner·Eric Torrence·Oscar Ivan Valdes Martinez
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Abstract

This letter presents the measurement of the energy-dependent neutrino-nucleon cross section in tungsten and the differential flux of muon neutrinos and anti-neutrinos. The analysis is performed using proton-proton collision data at a center-of-mass energy of $13.6 \, {\rm TeV}$ and corresponding to an integrated luminosity of $(65.6 \pm 1.4) \, \mathrm{fb^{-1}}$. Using the active electronic components of the FASER detector, $338.1 \pm 21.0$ charged current muon neutrino interaction events are identified, with backgrounds from other processes subtracted. We unfold the neutrino events into a fiducial volume corresponding to the sensitive regions of the FASER detector and interpret the results in two ways: We use the expected neutrino flux to measure the cross section, and we use the predicted cross section to measure the neutrino flux. Both results are presented in six bins of neutrino energy, achieving the first differential measurement in the TeV range. The observed distributions align with Standard Model predictions. Using this differential data, we extract the contributions of neutrinos from pion and kaon decays.

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FASER Collaboration, Roshan Mammen Abraham, Xiaocong Ai, John Anders, Claire Antel, Akitaka Ariga, Tomoko Ariga, Jeremy Atkinson, Florian U. Bernlochner, Tobias Boeckh, Jamie Boyd, Lydia Brenner, Angela Burger, Franck Cadoux, Roberto Cardella, David W. Casper, Charlotte Cavanagh, Xin Chen, Dhruv Chouhan, Andrea Coccaro, Stephane Débieux, Monica D'Onofrio, Ansh Desai, Sergey Dmitrievsky, Radu Dobre, Sinead Eley, Yannick Favre, Deion Fellers, Jonathan L. Feng, Carlo Alberto Fenoglio, Didier Ferrere, Max Fieg, Wissal Filali, Elena Firu, Edward Galantay, Ali Garabaglu, Stephen Gibson, Sergio Gonzalez-Sevilla, Yuri Gornushkin, Carl Gwilliam, Daiki Hayakawa, Michael Holzbock, Shih-Chieh Hsu, Zhen Hu, Giuseppe Iacobucci, Tomohiro Inada, Luca Iodice, Sune Jakobsen, Hans Joos, Enrique Kajomovitz, Hiroaki Kawahara, Alex Keyken, Felix Kling, Daniela Köck, Pantelis Kontaxakis, Umut Kose, Rafaella Kotitsa, Susanne Kuehn, Thanushan Kugathasan, Lorne Levinson, Ke Li, Jinfeng Liu, Yi Liu, Margaret S. Lutz, Jack MacDonald, Chiara Magliocca, Toni Mäkelä, Lawson McCoy, Josh McFayden, Andrea Pizarro Medina, Matteo Milanesio, Théo Moretti, Mitsuhiro Nakamura, Toshiyuki Nakano, Laurie Nevay, Ken Ohashi, Hidetoshi Otono, Hao Pang, Lorenzo Paolozzi, Pawan Pawan, Brian Petersen, Titi Preda, Markus Prim, Michaela Queitsch-Maitland, Hiroki Rokujo, André Rubbia, Jorge Sabater-Iglesias, Osamu Sato, Paola Scampoli, Kristof Schmieden, Matthias Schott, Anna Sfyrla, Davide Sgalaberna, Mansoora Shamim, Savannah Shively, Yosuke Takubo, Noshin Tarannum, Ondrej Theiner, Eric Torrence, Oscar Ivan Valdes Martinez. 2024-12-04. First Measurement of the Muon Neutrino Interaction Cross Section and Flux as a Function of Energy at the LHC with FASER. https://doi.org/10.1103/physrevlett.134.211801

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