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FASERnu is a proposed small and inexpensive emulsion detector designed to detect collider neutrinos for the first time and study their properties. FASERnu will be located directly in front of FASER, 480 m from the ATLAS interaction point…

This paper presents the reconstruction and performance evaluation of the FASER$\nu$ emulsion detector, which aims to measure interactions from neutrinos produced in the forward direction of proton-proton collisions at the CERN Large Hadron…

Instrumentation and Detectors · Physics 2025-05-05 FASER Collaboration , Roshan Mammen Abraham , Xiaocong Ai , Saul Alonso Monsalve , John Anders , Claire Antel , Akitaka Ariga , Tomoko Ariga , Jeremy Atkinson , Florian U. Bernlochner , Tobias Boeckh , Jamie Boyd , Lydia Brenner , Angela Burger , Franck Cadou , Roberto Cardella , David W. Casper , Charlotte Cavanagh , Xin Chen , Kohei Chinone , Dhruv Chouhan , Andrea Coccaro , Stephane Débieu , Ansh Desai , Sergey Dmitrievsky , Radu Dobre , Monica D'Onofrio , Sinead Eley , Yannick Favre , Deion Fellers , Jonathan L. Feng , Carlo Alberto Fenoglio , Didier Ferrere , Max Fieg , Wissal Filali , Elena Firu , Haruhi Fujimori , 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 , Takumi Kanai , Hiroaki Kawahara , Alex Keyken , Felix Kling , Daniela Köck , Pantelis Kontaxakis , Umut Kose , Rafaella Kotitsa , Peter Krack , Susanne Kuehn , Thanushan Kugathasan , Lorne Levinson , Botao 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 , Keiko Moriyama , Mitsuhiro Nakamura , Toshiyuki Nakano , Laurie Nevay , Motoya Nonaka , Yuma Ohara , Ken Ohashi , Kazuaki Okui , Hidetoshi Otono , Hao Pang , Lorenzo Paolozzi , Pawan Pawan , Brian Petersen , Titi Preda , Markus Prim , Michaela Queitsch-Maitland , Juan Rojo , Hiroki Rokujo , André Rubbia , Jorge Sabater-Iglesias , Osamu Sato , Paola Scampoli , Kristof Schmieden , Matthias Schott , Christiano Sebastiani , Anna Sfyrla , Davide Sgalaberna , Mansoora Shamim , Savannah Shively , Yosuke Takubo , Noshin Tarannum , Ondrej Theiner , Simon Thor , Eric Torrence , Oscar Ivan Valdes Martinez , Svetlana Vasina , Benedikt Vormwald , Yuxiao Wang , Eli Welch , Monika Wielers , Benjamin James Wilson , Jialin Wu , Johannes Martin Wuthrich , Yue Xu , Stefano Zambito , Shunliang Zhang , Xingyu Zhao

We study the impact of the coupling of neutrinos with a new light neutral gauge boson, $Z^\prime$, with a mass of less than 500 {\rm MeV} in FASER$\nu$ experiment. Scenarios in which a light gauge boson is coupled to neutrinos are motivated…

High Energy Physics - Phenomenology · Physics 2021-09-01 Majid Bahraminasr , Pouya Bakhti , Meshkat Rajaee

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…

High Energy Physics - Experiment · Physics 2025-08-01 FASER Collaboration , Roshan Mammen Abraham , Xiaocong Ai , Saul Alonso Monsalve , 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 , Ansh Desai , Sergey Dmitrievsky , Radu Dobre , Monica D'Onofrio , Sinead Eley , Yannick Favre , Jonathan L. Feng , Carlo Alberto Fenoglio , Didier Ferrere , Max Fieg , Wissal Filali , Elena Firu , Haruhi Fujimori , Edward Galantay , Ali Garabaglu , Stephen Gibson , Sergio Gonzalez-Sevilla , Yuri Gornushkin , Yotam Granov , 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 , Peter Krack , Susanne Kuehn , Thanushan Kugathasan , Sebastian Laudage , Lorne Levinson , Botao 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 , Keiko Moriyama , Mitsuhiro Nakamura , Toshiyuki Nakano , Laurie Nevay , Ken Ohashi , Hidetoshi Otono , Lorenzo Paolozzi , Pawan Pawan , Brian Petersen , Titi Preda , Markus Prim , Michaela Queitsch-Maitland , Juan Rojo , Hiroki Rokujo , André Rubbia , Jorge Sabater-Iglesias , Osamu Sato , Paola Scampoli , Kristof Schmieden , Matthias Schott , Christiano Sebastiani , Anna Sfyrla , Davide Sgalaberna , Mansoora Shamim , Savannah Shively , Yosuke Takubo , Noshin Tarannum , Ondrej Theiner , Simon Thor , Eric Torrence , Oscar Ivan Valdes Martinez , Svetlana Vasina , Benedikt Vormwald , Yuxiao Wang , Eli Welch , Monika Wielers , Benjamin James Wilson , Jialin Wu , Johannes Martin Wuthrich , Yue Xu , Daichi Yoshikawa , Stefano Zambito , Shunliang Zhang , Xingyu Zhao

We investigate the sensitivity of the FASER$\nu$ detector to new physics in the form of non-standard neutrino interactions. FASER$\nu$, which has recently been installed 480 m downstream of the ATLAS interaction point, will for the first…

High Energy Physics - Phenomenology · Physics 2021-11-03 Adam Falkowski , Martín González-Alonso , Joachim Kopp , Yotam Soreq , Zahra Tabrizi

The proton-proton collisions at the Large Hadron Collider (LHC) produce an intense, high-energy beam of neutrinos of all flavors, collimated in the forward direction. Recently two dedicated neutrino experiments, FASER and SND@LHC, have…

High Energy Physics - Experiment · Physics 2025-01-20 Akitaka Ariga , Jamie Boyd , Felix Kling , Albert De Roeck

FASER,the ForwArd Search ExpeRiment,is a proposed experiment dedicated to searching for light, extremely weakly-interacting particles at the LHC. Such particles may be produced in the LHC's high-energy collisions and travel long distances…

We propose a novel approach for discovering a light dark photon in the forward experiments at the LHC, including the SND@LHC and the FASER experiments. Assuming the dark photon is lighter than twice the electron mass and feebly interacts…

High Energy Physics - Phenomenology · Physics 2024-10-16 Yeong Gyun Kim , Kang Young Lee , Soo-hyeon Nam

FASER, ForwArd Search ExpeRiment at the LHC, has been proposed as a small, very far forward detector to discover new, light, weakly-coupled particles. Previous work showed that with a total volume of just $\sim 0.1 - 1~\rm{m}^3$, FASER can…

High Energy Physics - Phenomenology · Physics 2018-04-26 Jonathan L. Feng , Iftah Galon , Felix Kling , Sebastian Trojanowski

FASER$\nu$ is a newly proposed experiment which will take data in run III of the LHC during 2021-2023. It will be located in front of the FASER detector, 480~m away from the ATLAS interaction point in the forward direction. Its main goal is…

High Energy Physics - Phenomenology · Physics 2020-10-28 Pouya Bakhti , Yasaman Farzan , Silvia Pascoli

The first FASER search for a light, long-lived particle decaying into a pair of photons is reported. The search uses LHC proton-proton collision data at $\sqrt{s}=13.6~\text{TeV}$ collected in 2022 and 2023, corresponding to an integrated…

High Energy Physics - Experiment · Physics 2024-12-18 FASER collaboration , Roshan Mammen Abraham , Xiaocong Ai , John Anders , Claire Antel , Akitaka Ariga , Tomoko Ariga , Jeremy Atkinson , Florian U. Bernlochner , Emma Bianchi , Tobias Boeckh , Jamie Boyd , Lydia Brenner , Angela Burger , Franck Cadoux , Roberto Cardella , David W. Casper , Charlotte Cavanagh , Xin Chen , Eunhyung Cho , 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 , Lorenzo Paolozzi , 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 , Svetlana Vasina , Benedikt Vormwald , Di Wang , Yuxiao Wang , Eli Welch , Yue Xu , Samuel Zahorec , Stefano Zambito , Shunliang Zhang

FASER$\nu$ is a newly proposed detector whose main mission is to detect the neutrino flux from the collision of the proton beams at the ATLAS Interaction Point (IP) during the run III of the LHC in 2022-2024. We show that this detector can…

High Energy Physics - Phenomenology · Physics 2021-04-28 Pouya Bakhti , Yasaman Farzan , Silvia Pascoli

This Letter describes the search for an enhanced production rate of events with a charged lepton and a neutrino in high-energy pp collisions at the LHC. The analysis uses data collected with the CMS detector, with an integrated luminosity…

High Energy Physics - Experiment · Physics 2013-05-01 CMS Collaboration

We study the prospects for discovering heavy neutral leptons at ForwArd Search ExpeRiment (FASER), the newly proposed detector at the LHC. Previous studies showed that a relatively small detector with ~10 m length and ~1 m cross sectional…

High Energy Physics - Phenomenology · Physics 2018-05-28 Felix Kling , Sebastian Trojanowski

The FASER{\nu} experiment has detected the first neutrino events coming from LHC. Near future high-statistic neutrino samples will allow us to search for new physics within the neutrino sector. Motivated by the forthcoming promising…

High Energy Physics - Phenomenology · Physics 2024-01-11 Jesús Miguel Celestino-Ramírez , F. J. Escrihuela , L. J. Flores , O. G. Miranda

The LHCf experiment is dedicated to the measurement of very forward particle production in the high energy hadron-hadron collisions at LHC, with the aim of improving the cosmic-ray air shower developments models. The detector has taken data…

High Energy Physics - Experiment · Physics 2013-10-15 O. Adriani

In detecting neutrinos from the Large Hadron Collider, FASER$\nu$ will record the most energetic laboratory neutrinos ever studied. While charged current neutrino scattering events can be cleanly identified by an energetic lepton exiting…

High Energy Physics - Phenomenology · Physics 2021-03-25 Ahmed Ismail , Felix Kling , Roshan Mammen Abraham

Nonzero neutrino masses guarantee new physics and neutrinos are excellent probes of extreme environments in the Universe. The recent collider neutrino experimental program, including FASER$\nu$ and SND@LHC, along with the planned Forward…

High Energy Physics - Phenomenology · Physics 2026-05-29 Bei Zhou , Pedro Machado

The currently operating FASER experiment and the planned Forward Physics Facility (FPF) will detect a large number of neutrinos produced in proton-proton collisions at the LHC. In this work, we estimate neutrino fluxes at these detectors…

High Energy Physics - Phenomenology · Physics 2024-02-05 Atri Bhattacharya , Felix Kling , Ina Sarcevic , Anna M. Stasto

A search for new physics in events featuring a single photon and missing transverse momentum is presented, using proton-proton $\sqrt{s}$ = 13 TeV collision data corresponding to an integrated luminosity of 101 fb$^{-1}$ collected by the…

High Energy Physics - Experiment · Physics 2026-05-04 CMS Collaboration