Search for events with one displaced vertex from long-lived neutral particles decaying into hadronic jets in the ATLAS muon spectrometer in $pp$ collisions at $\sqrt{s}=13$ TeV

A search for events with one displaced vertex from long-lived particles using data collected by the ATLAS detector at the Large Hadron Collider is presented, using 140 fb$^{-1}$ of proton-proton collision data at $\sqrt{s} = 13$ TeV recorded in 2015-2018. The search employs techniques for reconstructing vertices of long-lived particles decaying into hadronic jets in the muon spectrometer displaced between 3 m and 14 m from the primary interaction vertex. The observed number of events is consistent with the expected background and limits for several benchmark signals are determined. A scalar-portal model and a Higgs-boson-portal baryogenesis model are considered. A dedicated analysis channel is employed to target Z-boson associated long-lived particle production, including an axion-like particle and a dark photon model. For the Higgs boson model, branching fractions above 1% are excluded at 95% confidence level for long-lived particle proper decay lengths ranging from 5 cm to 40 m. For the photo-phobic axion-like particle model considered, this search produces the strongest limits to date for proper decay lengths greater than $\mathcal{O}(10)$ cm.

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ArXiv.org
Published
2025-01-01
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https://doi.org/10.3204/pubdb-2025-02546
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Particle physics theoretical and experimental studies
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article
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article

Search for events with one displaced vertex from long-lived neutral particles decaying into hadronic jets in the ATLAS muon spectrometer in $pp$ collisions at $\sqrt{s}=13$ TeV

G. Unal, Thomas Schwarz, T. Komárek, Katie Piper et al.
ArXiv.org
Particle physics theoretical and experimental studies
article

Search for events with one displaced vertex from long-lived neutral particles decaying into hadronic jets in the ATLAS muon spectrometer in $pp$ collisions at $\sqrt{s}=13$ TeV

G. Unal, Thomas Schwarz, T. Komárek, Katie Piper, Y. Cao, P. Dervan, E. N. Umaka, Yu. Volkotrub, J. Hoya, Pratik Jawahar, G. Aielli, A. K. Gilbert, A. D. Auriol, A. K. H. Kong, M. Tsopoulou, Anke Ackermann, V. Petousis, F. Curcio, J. Mamuzic, Ali Can Canbay, I. Sýkora, Mingxu He, Anubhav Gupta, Lorenzo Sanfilippo, B. P. Kerridge, J. L. Oliver, R. Cardarelli, N. Sur, C. Grefe, Marten Zefanja Barel, Youssef Khoulaki, C. Schiavi, Gregory Douglas Penn, T. Carli, A. N. Karyukhin, Qichen Dong, L. Ferencz, M. Aleksa, Hannah van der Schyf, U. Kruchonak, M. Akbiyik, M. Marjanović, Gianmario Cesarini, Michael Duehrssen-Debling, W. Dąbrowski, Y. Rozen, M. Ridel, I. Vukotić, M. Boonekamp, Julian Friedrich Wack, A. Ambler, L. M. Baltes, A. Sidoti, O. Arnaez, T. Nobe, Zaza Chubinidze, M. Bindi, S. Wahdan, O. Majerský, Florian Kirfel, J. Haley, Yinmiao Wang, M. Bruschi, D. Giugni, B. Abbott, A. Cerri, D. Duda, M. Bauce, P. A. Ekman, C. Alexa, O. Jinnouchi, P. Steinberg, F. Bartels, A. 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Fiedler, Lacey Rainbolt, Rose Atashi, Ahmed Markhoos, Shubham Gupta, Yi He
article en

Abstract

A search for events with one displaced vertex from long-lived particles using data collected by the ATLAS detector at the Large Hadron Collider is presented, using 140 fb$^{-1}$ of proton-proton collision data at $\sqrt{s} = 13$ TeV recorded in 2015-2018. The search employs techniques for reconstructing vertices of long-lived particles decaying into hadronic jets in the muon spectrometer displaced between 3 m and 14 m from the primary interaction vertex. The observed number of events is consistent with the expected background and limits for several benchmark signals are determined. A scalar-portal model and a Higgs-boson-portal baryogenesis model are considered. A dedicated analysis channel is employed to target Z-boson associated long-lived particle production, including an axion-like particle and a dark photon model. For the Higgs boson model, branching fractions above 1% are excluded at 95% confidence level for long-lived particle proper decay lengths ranging from 5 cm to 40 m. For the photo-phobic axion-like particle model considered, this search produces the strongest limits to date for proper decay lengths greater than $\mathcal{O}(10)$ cm.

ArXiv.org
Université Paris Cité (FR), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Laboratoire d’Annecy de Physique des Particules (FR), Deutsches Elektronen-Synchrotron DESY (DE), Laboratoire AstroParticule et Cosmologie (FR), Centre de physique des particules de Marseille (FR), Laboratoire de Physique Nucléaire et de Hautes Énergies (FR), CEA Paris-Saclay (FR), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), Laboratoire de Physique Subatomique et de Cosmologie (FR), Institut de Recherche sur les Lois Fondamentales de l'Univers (FR), Laboratoire des 2 Infinis Toulouse (FR)
Openalex Percentile: Top 87%
Particle physics theoretical and experimental studies
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