Preprint

PUBDB-2024-06299

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Shining Light on the Dark Sector: Search for Axion-like Particles and Other New Physics in Photonic Final States with FASER

Mammen Abraham, R. ; Ai, X. ; Anders, J. ; Antel, C. ; Ariga, A. ; Ariga, T. ; Atkinson, J. ; Bernlochner, F. U. ; Bianchi, E. ; Boeckh, T. ; Boyd, J. ; Brenner, L. ; Burger, A. ; Cadoux, F. ; Cardella, R. ; Casper, D. W. ; Cavanagh, C. ; Chen, X. ; Cho, E. ; Chouhan, D. ; Coccaro, A. ; Débieux, S. ; D'Onofrio, M. ; Desai, A. ; Dmitrievsky, S. ; Dobre, R. ; Eley, S. ; Favre, Y. ; Fellers, D. ; Feng, J. L. ; Fenoglio, C. A. ; Ferrere, D. ; Fieg, M. ; Filali, W. ; Firu, E. ; Galantay, E. ; Garabaglu, A. ; Gibson, S. ; Gonzalez-Sevilla, S. ; Gornushkin, Y. ; Gwilliam, C. ; Hayakawa, D. ; Holzbock, M. ; Hsu, S.-C. ; Hu, Z. ; Iacobucci, G. ; Inada, T. ; Iodice, L. ; Jakobsen, S. ; Joos, H. ; Kajomovitz, E. ; Kawahara, H. ; Keyken, A. ; Kling, F.DESY* ; Köck, D. ; Kontaxakis, P. ; Kose, U. ; Kotitsa, R. ; Kuehn, S. ; Kugathasan, T. ; Levinson, L. ; Li, K. ; Liu, J. ; Liu, Y. ; Lutz, M. S. ; MacDonald, J. ; Magliocca, C. ; Mäkelä, T. ; McCoy, L. ; McFayden, J. ; Medina, A. P. ; Milanesio, M. ; Moretti, T. ; Nakamura, M. ; Nakano, T. ; Nevay, L. ; Ohashi, K. ; Otono, H. ; Paolozzi, L. ; Petersen, B. ; Preda, T. ; Prim, M. ; Queitsch-Maitland, M. ; Rokujo, H. ; Rubbia, A. ; Sabater-Iglesias, J. ; Sato, O. ; Scampoli, P. ; Schmieden, K. ; Schott, M. ; Sfyrla, A. ; Sgalaberna, D. ; Shamim, M. ; Shively, S. ; Takubo, Y. ; Tarannum, N. ; Theiner, O. ; Torrence, E. ; Martinez, O. I. V. ; Vasina, S. ; Vormwald, B. ; Wang, D.DESY* ; Wang, Y. ; Welch, E. ; Xu, Y. ; Zahorec, S. ; Zambito, S. ; Zhang, S. ; FASER Collaboration (Collaboration Author)

2024

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Please use a persistent id in citations: doi:10.3204/PUBDB-2024-06299

Report No.: CERN-EP-2024-262; DESY-24-153; arXiv:2410.10363

Abstract: 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 luminosity of $57.7\text{fb}^{-1}$. A model with axion-like particles (ALPs) dominantly coupled to weak gauge bosons is the primary target. Signal events are characterised by high-energy deposits in the electromagnetic calorimeter and no signal in the veto scintillators. One event is observed, compared to a background expectation of $0.44 \pm 0.39$ events, which is entirely dominated by neutrino interactions. World-leading constraints on ALPs are obtained for masses up to $300~\text{MeV}$ and couplings to the Standard Model W gauge boson, $g_{aWW}$, around $10^{-4}$ GeV$^{-1}$, testing a previously unexplored region of parameter space. Other new particle models that lead to the same experimental signature, including ALPs coupled to gluons or photons, U(1)$_B$ gauge bosons, up-philic scalars, and a Type-I two-Higgs doublet model, are also considered for interpretation, and new constraints on previously viable parameter space are presented in this paper.

Keyword(s): High Energy Physics - Experiment (hep-ex) ; FOS: Physical sciences

Note: to be submitted to journal

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. DFG project G:(GEPRIS)390833306 - EXC 2121: Quantum Universe (390833306) (390833306)

Experiment(s):

1. LHC: Other

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Database coverage:
; ; Published

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article Mammen Abraham, R. ; Ai, X. ; Anders, J. ; et al
Shining light on the dark sector: search for axion-like particles and other new physics in photonic final states with FASER
Journal of high energy physics 01(1), 199 (2024) [10.1007/JHEP01(2025)199]2024     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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