Latest neutrino results from the FASER experiment and their implications for forward hadron production
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2025
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| author | FASER Collaboration Abraham, Roshan Mammen Ai, Xiaocong Monsalve, Saul Alonso 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 Chouhan, Dhruv Coccaro, Andrea Débieux, Stephane Desai, Ansh Dmitrievsky, Sergey Dobre, Radu D'Onofrio, Monica Eley, Sinead Favre, Yannick Feng, Jonathan L. Fenoglio, Carlo Alberto Ferrere, Didier Fieg, Max Filali, Wissal Firu, Elena Fujimori, Haruhi Galantay, Edward Garabaglu, Ali Gibson, Stephen Gonzalez-Sevilla, Sergio Gornushkin, Yuri Granov, Yotam Gwilliam, Carl Hayakawa, Daiki Holzbock, Michael Hsu, Shih-Chieh Hu, Zhen Iacobucci, Giuseppe Inada, Tomohiro Iodice, Luca Jakobsen, Sune Joos, Hans Kajomovitz, Enrique Kawahara, Hiroaki Keyken, Alex Kling, Felix Köck, Daniela Kontaxakis, Pantelis Kose, Umut Kotitsa, Rafaella Krack, Peter Kuehn, Susanne Kugathasan, Thanushan Laudage, Sebastian Levinson, Lorne Li, Botao Liu, Jinfeng Liu, Yi Lutz, Margaret S. MacDonald, Jack Magliocca, Chiara Mäkelä, Toni McCoy, Lawson McFayden, Josh Medina, Andrea Pizarro Milanesio, Matteo Moretti, Théo Moriyama, Keiko Nakamura, Mitsuhiro Nakano, Toshiyuki Nevay, Laurie Ohashi, Ken Otono, Hidetoshi Paolozzi, Lorenzo Pawan, Pawan Petersen, Brian Preda, Titi Prim, Markus Queitsch-Maitland, Michaela Rojo, Juan Rokujo, Hiroki Rubbia, André Sabater-Iglesias, Jorge Sato, Osamu Scampoli, Paola Schmieden, Kristof Schott, Matthias Sebastiani, Christiano Sfyrla, Anna Sgalaberna, Davide Shamim, Mansoora Shively, Savannah Takubo, Yosuke Tarannum, Noshin Theiner, Ondrej Thor, Simon Torrence, Eric Martinez, Oscar Ivan Valdes Vasina, Svetlana Vormwald, Benedikt Wang, Yuxiao Welch, Eli Wielers, Monika Wilson, Benjamin James Wu, Jialin Wuthrich, Johannes Martin Xu, Yue Yoshikawa, Daichi Zambito, Stefano Zhang, Shunliang Zhao, Xingyu |
| author_facet | FASER Collaboration Abraham, Roshan Mammen Ai, Xiaocong Monsalve, Saul Alonso 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 Chouhan, Dhruv Coccaro, Andrea Débieux, Stephane Desai, Ansh Dmitrievsky, Sergey Dobre, Radu D'Onofrio, Monica Eley, Sinead Favre, Yannick Feng, Jonathan L. Fenoglio, Carlo Alberto Ferrere, Didier Fieg, Max Filali, Wissal Firu, Elena Fujimori, Haruhi Galantay, Edward Garabaglu, Ali Gibson, Stephen Gonzalez-Sevilla, Sergio Gornushkin, Yuri Granov, Yotam Gwilliam, Carl Hayakawa, Daiki Holzbock, Michael Hsu, Shih-Chieh Hu, Zhen Iacobucci, Giuseppe Inada, Tomohiro Iodice, Luca Jakobsen, Sune Joos, Hans Kajomovitz, Enrique Kawahara, Hiroaki Keyken, Alex Kling, Felix Köck, Daniela Kontaxakis, Pantelis Kose, Umut Kotitsa, Rafaella Krack, Peter Kuehn, Susanne Kugathasan, Thanushan Laudage, Sebastian Levinson, Lorne Li, Botao Liu, Jinfeng Liu, Yi Lutz, Margaret S. MacDonald, Jack Magliocca, Chiara Mäkelä, Toni McCoy, Lawson McFayden, Josh Medina, Andrea Pizarro Milanesio, Matteo Moretti, Théo Moriyama, Keiko Nakamura, Mitsuhiro Nakano, Toshiyuki Nevay, Laurie Ohashi, Ken Otono, Hidetoshi Paolozzi, Lorenzo Pawan, Pawan Petersen, Brian Preda, Titi Prim, Markus Queitsch-Maitland, Michaela Rojo, Juan Rokujo, Hiroki Rubbia, André Sabater-Iglesias, Jorge Sato, Osamu Scampoli, Paola Schmieden, Kristof Schott, Matthias Sebastiani, Christiano Sfyrla, Anna Sgalaberna, Davide Shamim, Mansoora Shively, Savannah Takubo, Yosuke Tarannum, Noshin Theiner, Ondrej Thor, Simon Torrence, Eric Martinez, Oscar Ivan Valdes Vasina, Svetlana Vormwald, Benedikt Wang, Yuxiao Welch, Eli Wielers, Monika Wilson, Benjamin James Wu, Jialin Wuthrich, Johannes Martin Xu, Yue Yoshikawa, Daichi Zambito, Stefano Zhang, Shunliang Zhao, Xingyu |
| contents | The muon puzzle -- an excess of muons relative to simulation predictions in ultra-high-energy cosmic-ray air showers -- has been reported by many experiments. This suggests that forward particle production in hadronic interactions is not fully understood. Some of the scenarios proposed to resolve this predict reduced production of forward neutral pions and enhanced production of forward kaons (or other particles). The FASER experiment at the LHC is located 480 m downstream of the ATLAS interaction point and is sensitive to neutrinos and muons, which are the decay products of forward charged pions and kaons. In this study, the latest measurements of electron and muon neutrino fluxes are presented using the data corresponding to 9.5 $\mathrm{fb^{-1}}$ and 65.6 $\mathrm{fb^{-1}}$ of proton-proton collisions with $\sqrt{s}=13.6~\mathrm{TeV}$ by the FASER$ν$ and the FASER electronic detector, respectively. These fluxes are compared with predictions from recent hadronic interaction models, including EPOS-LHCr, SIBYLL 2.3e, and QGSJET 3. The predictions are generally consistent with the measured fluxes from FASER, although some discrepancies appear in certain energy bins. More precise flux measurements with additional data will follow soon, enabling validation of pion, kaon, and charm meson production with finer energy binning, reduced uncertainties, and multi-differential analyses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_23552 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Latest neutrino results from the FASER experiment and their implications for forward hadron production FASER Collaboration Abraham, Roshan Mammen Ai, Xiaocong Monsalve, Saul Alonso 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 Chouhan, Dhruv Coccaro, Andrea Débieux, Stephane Desai, Ansh Dmitrievsky, Sergey Dobre, Radu D'Onofrio, Monica Eley, Sinead Favre, Yannick Feng, Jonathan L. Fenoglio, Carlo Alberto Ferrere, Didier Fieg, Max Filali, Wissal Firu, Elena Fujimori, Haruhi Galantay, Edward Garabaglu, Ali Gibson, Stephen Gonzalez-Sevilla, Sergio Gornushkin, Yuri Granov, Yotam Gwilliam, Carl Hayakawa, Daiki Holzbock, Michael Hsu, Shih-Chieh Hu, Zhen Iacobucci, Giuseppe Inada, Tomohiro Iodice, Luca Jakobsen, Sune Joos, Hans Kajomovitz, Enrique Kawahara, Hiroaki Keyken, Alex Kling, Felix Köck, Daniela Kontaxakis, Pantelis Kose, Umut Kotitsa, Rafaella Krack, Peter Kuehn, Susanne Kugathasan, Thanushan Laudage, Sebastian Levinson, Lorne Li, Botao Liu, Jinfeng Liu, Yi Lutz, Margaret S. MacDonald, Jack Magliocca, Chiara Mäkelä, Toni McCoy, Lawson McFayden, Josh Medina, Andrea Pizarro Milanesio, Matteo Moretti, Théo Moriyama, Keiko Nakamura, Mitsuhiro Nakano, Toshiyuki Nevay, Laurie Ohashi, Ken Otono, Hidetoshi Paolozzi, Lorenzo Pawan, Pawan Petersen, Brian Preda, Titi Prim, Markus Queitsch-Maitland, Michaela Rojo, Juan Rokujo, Hiroki Rubbia, André Sabater-Iglesias, Jorge Sato, Osamu Scampoli, Paola Schmieden, Kristof Schott, Matthias Sebastiani, Christiano Sfyrla, Anna Sgalaberna, Davide Shamim, Mansoora Shively, Savannah Takubo, Yosuke Tarannum, Noshin Theiner, Ondrej Thor, Simon Torrence, Eric Martinez, Oscar Ivan Valdes Vasina, Svetlana Vormwald, Benedikt Wang, Yuxiao Welch, Eli Wielers, Monika Wilson, Benjamin James Wu, Jialin Wuthrich, Johannes Martin Xu, Yue Yoshikawa, Daichi Zambito, Stefano Zhang, Shunliang Zhao, Xingyu High Energy Physics - Experiment The muon puzzle -- an excess of muons relative to simulation predictions in ultra-high-energy cosmic-ray air showers -- has been reported by many experiments. This suggests that forward particle production in hadronic interactions is not fully understood. Some of the scenarios proposed to resolve this predict reduced production of forward neutral pions and enhanced production of forward kaons (or other particles). The FASER experiment at the LHC is located 480 m downstream of the ATLAS interaction point and is sensitive to neutrinos and muons, which are the decay products of forward charged pions and kaons. In this study, the latest measurements of electron and muon neutrino fluxes are presented using the data corresponding to 9.5 $\mathrm{fb^{-1}}$ and 65.6 $\mathrm{fb^{-1}}$ of proton-proton collisions with $\sqrt{s}=13.6~\mathrm{TeV}$ by the FASER$ν$ and the FASER electronic detector, respectively. These fluxes are compared with predictions from recent hadronic interaction models, including EPOS-LHCr, SIBYLL 2.3e, and QGSJET 3. The predictions are generally consistent with the measured fluxes from FASER, although some discrepancies appear in certain energy bins. More precise flux measurements with additional data will follow soon, enabling validation of pion, kaon, and charm meson production with finer energy binning, reduced uncertainties, and multi-differential analyses. |
| title | Latest neutrino results from the FASER experiment and their implications for forward hadron production |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2507.23552 |