Search for decays of the Higgs boson into scalar particles decaying into four or six $b$-quarks using $pp$ collisions at $\sqrt{s}= 13\,\mathrm{TeV}$ with the ATLAS detector

A search for exotic decays of the Higgs boson $H$ into new scalar or pseudoscalar particles that subsequently decay into $b$-quarks is presented. The search considers $ZH$ production with several decay scenarios for the Higgs boson: first to a pair of identical scalars, $H\rightarrow 2a \rightarrow 4b$, second to a pair of scalars with different masses ($m_{a1} +m_{a2}$), either directly, $H\rightarrow a_1a_2 \rightarrow 4b$, or via a longer decay chain, $H \rightarrow a_1a_2 \rightarrow 3a_1 \rightarrow 6b$. The analysis uses proton-proton collision data at $\sqrt{s} = 13$ TeV collected with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of $140~\mathrm{fb}^{-1}$. No significant excess above the Standard Model prediction is observed. The search sets upper limits at 95% confidence level on the ratio of the Higgs boson production cross-section to the SM prediction times the branching ratio of Higgs bosons decaying into $4b$ or $6b$, between 4% and 25% for $σ(ZH)/σ_{\text{SM}}(ZH) \times \mathcal{B}$($H \rightarrow 2a \rightarrow 4b$), between 24% and 38% for $σ(ZH)/σ_{\text{SM}}(ZH) \times \mathcal{B}$($H \rightarrow a_1a_2 \rightarrow 4b$), and between 10% and 20% for $σ(ZH)/σ_{\text{SM}}(ZH) \times \mathcal{B}$($H \rightarrow a_1a_2 \rightarrow 3a_1 \rightarrow 6b$), depending on the masses of the scalar particles.

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ArXiv.org
Published
2025-01-01
DOI
https://doi.org/10.3204/pubdb-2025-02273
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Particle physics theoretical and experimental studies
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article
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article

Search for decays of the Higgs boson into scalar particles decaying into four or six $b$-quarks using $pp$ collisions at $\sqrt{s}= 13\,\mathrm{TeV}$ with the ATLAS detector

A. Mann, G. Unal, A. Zoccoli, S. Bansal et al.
ArXiv.org
Particle physics theoretical and experimental studies
article

Search for decays of the Higgs boson into scalar particles decaying into four or six $b$-quarks using $pp$ collisions at $\sqrt{s}= 13\,\mathrm{TeV}$ with the ATLAS detector

A. Mann, G. Unal, A. Zoccoli, S. Bansal, T. Komárek, Katie Piper, Yong Zhou, E. Egidio Purcino De Souza, E. N. Umaka, Yu. Volkotrub, M. Baselga, J. Hoya, Pratik Jawahar, M. Toscani, G. Aielli, A. K. Gilbert, A. D. Auriol, Sahar Hammoud, M. Tsopoulou, Anke Ackermann, V. Petousis, F. Curcio, J. Mamuzic, Ali Can Canbay, I. Sýkora, M. A. L. Leite, E. Kasimi, G. Bruni, Y. Xu, Anubhav Gupta, Lorenzo Sanfilippo, B. P. Kerridge, Tanvi Wamorkar, N. Sur, C. Grefe, Marten Zefanja Barel, Youssef Khoulaki, M. N. Agaras, C. Schiavi, Gregory Douglas Penn, P. Yin, J. Niermann, Qichen Dong, L. Ferencz, Š. Todorova-Nová, Hannah van der Schyf, L. J. Levinson, M. Marjanović, Gianmario Cesarini, Michael Duehrssen-Debling, W. Dąbrowski, Y. Rozen, M. Ridel, I. Vukotić, A. De Santo, Julian Friedrich Wack, A. Ambler, L. M. Baltes, O. Arnaez, T. Nobe, Zaza Chubinidze, M. Bindi, S. Wahdan, O. Majerský, J. Haley, Yinmiao Wang, B. Abbott, Matthew Leigh, A. Cerri, D. Duda, M. Bauce, P. A. Ekman, C. Alexa, O. 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article en

Abstract

A search for exotic decays of the Higgs boson $H$ into new scalar or pseudoscalar particles that subsequently decay into $b$-quarks is presented. The search considers $ZH$ production with several decay scenarios for the Higgs boson: first to a pair of identical scalars, $H\rightarrow 2a \rightarrow 4b$, second to a pair of scalars with different masses ($m_{a1} +m_{a2}$), either directly, $H\rightarrow a_1a_2 \rightarrow 4b$, or via a longer decay chain, $H \rightarrow a_1a_2 \rightarrow 3a_1 \rightarrow 6b$. The analysis uses proton-proton collision data at $\sqrt{s} = 13$ TeV collected with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of $140~\mathrm{fb}^{-1}$. No significant excess above the Standard Model prediction is observed. The search sets upper limits at 95% confidence level on the ratio of the Higgs boson production cross-section to the SM prediction times the branching ratio of Higgs bosons decaying into $4b$ or $6b$, between 4% and 25% for $σ(ZH)/σ_{\text{SM}}(ZH) \times \mathcal{B}$($H \rightarrow 2a \rightarrow 4b$), between 24% and 38% for $σ(ZH)/σ_{\text{SM}}(ZH) \times \mathcal{B}$($H \rightarrow a_1a_2 \rightarrow 4b$), and between 10% and 20% for $σ(ZH)/σ_{\text{SM}}(ZH) \times \mathcal{B}$($H \rightarrow a_1a_2 \rightarrow 3a_1 \rightarrow 6b$), depending on the masses of the scalar particles.

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 88%
Particle physics theoretical and experimental studies
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