Search for Higgs boson decays into a pair of pseudoscalar particles in the $bb����$ final state with the ATLAS detector in $pp$ collisions at $\sqrt{s}=13$ TeV

descriptionPublicationkeyboard_double_arrow_right Article , Research , Preprint 01 Jan 2021Embargo end date: 01 Jan 2021 Italy, Italy, United Kingdom, Italy, Italy, Italy, Italy, United Kingdom, Italy, Italy, Germany, Australia, Italy, France, United Kingdom, Italy, Italy, Italy, Italy, Switzerland, Chile, Italy, United Kingdom Publisher:arXiv

Authors: Aad, G.; Abbott, B.; Abbott, D. C.; Abud, A. Abed; Abeling, K.; Abhayasinghe, D. K.; Abidi, S. H.; +193 Authors

Aad, G.; Abbott, B.; Abbott, D. C.; Abud, A. Abed; Abeling, K.; Abhayasinghe, D. K.; Abidi, S. H.; Aboulhorma, A.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Abusleme Hoffman, A. C.; Acharya, B. S.; Achkar, B.; Adam, L.; Bourdarios, C. Adam; Adamczyk, L.; Adamek, L.; Addepalli; V; Adelman, J.; Adiguzel, A.; Adorni, S.; Adye, T.; Affolder, A. A.; Afik, Y.; Agapopoulou, C.; Agaras, M. N.; Agarwala, J.; Aggarwal, A.; Agheorghiesei, C.; Aguilar-Saavedra, J. A.; Ahmad, A.; Ahmadov, F.; Ahmed, W. S.; Ai, X.; Aielli, G.; Aizenberg, I; Akatsuka, S.; Akbiyik, M.; Akesson, T. P. A.; Akimov; V; Al Khoury, K.; Alberghi, G. L.; Albert, J.; Albicocco, P.; Alconada Verzini, M. J.; Alderweireldt, S.; Aleksa, M.; Aleks; rov, I. N.; Alexa, C.; Alexopoulos, T.; Alfonsi, A.; Alfonsi, F.; Alhroob, M.; Ali, B.; Ali, S.; Aliev, M.; Alimonti, G.; Allaire, C.; Allbrooke, B. M. M.; Allport, P. P.; Aloisio, A.; Alonso, F.; Alpigiani, C.; Camelia, E. Alunno; Alvarez Estevez, M.; Alviggi, M. G.; Coutinho, Y. Amaral; Ambler, A.; Ambroz, L.; Amelung, C.; Amidei, D.; Amor Dos Santos, S. P.; Amoroso, S.; Amrouche, C. S.; Ananiev, V; Anastopoulos, C.; Andari, N.; Andeen, T.; Anders, J. K.; Andrean, S. Y.; Andreazza, A.; Angelidakis, S.; Angerami, A.; Anisenkov; V; Annovi, A.; Antel, C.; Anthony, M. T.; Antipov, E.; Antonelli, M.; Antrim, D. J. A.; Anulli, F.; Aoki, M.; Aparisi Pozo, J. A.; Aparo, M. A.; Bella, L. Aperio; Aranzabal, N.; Ferraz, V. Araujo; Arcangeletti, C.; Arce, A. T. H.; Arena, E.; Arguin, J-F; Argyropoulos, S.; Arling, J-H; Armbruster, A. J.; Armstrong, A.; Arnaez, O.; Arnold, H.; Tame, Z. P. Arrubarrena; Artoni, G.; Asada, H.; Asai, K.; Asai, S.; Asbah, N. A.; Asimakopoulou, E. M.; Asquith, L.; Assahsah, J.; Assamagan, K.; Astalos, R.; Atkin, R. J.; Atkinson, M.; Atlay, N. B.; Atmani, H.; Atmasiddha, P. A.; Augsten, K.; Auricchio, S.; Austrup, V. A.; Avner, G.; Avolio, G.; Ayoub, M. K.; Azuelos, G.; Babal, D.; Bachacou, H.; Bachas, K.; Bachiu, A.; Backman, F.; Badea, A.; Bagnaia, P.; Bahrasemani, H.; Bailey, A. J.; Bailey, V. R.; Baines, J. T.; Bakalis, C.; Baker, O. K.; Bakker, P. J.; Bakos, E.; Gupta, D. Bakshi; Balaji, S.; Balasubramanian, R.; Baldin, E. M.; Balek, P.; Ballabene, E.; Balli, F.; Balunas, W. K.; Balz, J.; Banas, E.; B; ieramonte, M.; B; yopadhyay, A.; Bansal, S.; Barak, L.; Barberio, E. L.; Barberis, D.; Barbero, M.; Barbour, G.; Barends, K. N.; Barillari, T.; Barisits, M-S; Barkeloo, J.; Barklow, T.; Barnett, B. M.; Barnett, R. M.; Baroncelli, A.; Barone, G.; Barr, A. J.; Navarro, L. Barranco; Barreiro, F.; da Costa, J. Barreiro Guimaraes; Barron, U.; Barsov, S.; Bartels, F.; Bartoldus, R.; Bartolini, G.; Barton, A. E.; Bartos, P.; Basalaev, A.; Basan, A.; Baselga, M.; Bashta, I; Bassalat, A.; Basso, M. J.; Basson, C. R.; Bates, R. L.; Batlamous, S.; Batley, J. R.;

Search for Higgs boson decays into a pair of pseudoscalar particles in the $bb��$ final state with the ATLAS detector in $pp$ collisions at $\sqrt{s}=13$ TeV

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Abstract

This paper presents a search for decays of the Higgs boson with a mass of 125 GeV into a pair of new pseudoscalar particles, H��aa, where one a-boson decays into a b-quark pair and the other into a muon pair. The search uses 139 fb-1 of proton-proton collision data at a center-of-mass energy of s=13 TeV recorded between 2015 and 2018 by the ATLAS experiment at the LHC. A narrow dimuon resonance is searched for in the invariant mass spectrum between 16 GeV and 62 GeV. The largest excess of events above the Standard Model backgrounds is observed at a dimuon invariant mass of 52 GeV and corresponds to a local (global) significance of 3.3�� (1.7��). Upper limits at 95% confidence level are placed on the branching ratio of the Higgs boson to the bb�� final state, B(H��aa��bb��), and are in the range 0.2��4.0��10-4, depending on the signal mass hypothesis.

Physical review / D 105(1), 012006 (2022). doi:10.1103/PhysRevD.105.012006

Published by Inst., Melville, NY

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Italy, Italy, United Kingdom, Italy, Italy, Italy, Italy, United Kingdom, Italy, Italy, Germany, Australia, Italy, France, United Kingdom, Italy, Italy, Italy, Italy, Switzerland, Chile, Italy, United Kingdom

Related Organizations

Queen Mary University of London
United Kingdom
University College London
United Kingdom
University of Rome Tor Vergata
Italy
Aix-Marseille University
France
Stockholm University
Sweden

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Keywords

Pseudoscalar particle: pair production, 13000 GeV-cms, branching ratio: upper limit, GeV, dimuon, resonance, High Energy Physics - Experiment, mass spectrum, High Energy Physics - Experiment (hep-ex), Higgs particle, branching ratio, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Narrow resonance, info:eu-repo/classification/ddc/530, dimuon: resonance, Dimuon: resonance, pseudoscalar particle, dimuon: mass spectrum, Higgs particle: rare decay, ATLAS, Settore FIS/01 - FISICA SPERIMENTALE, muon: pair production, P p: scattering, CERN LHC Coll, Higgs particle: mass, Higgs particle, decay, Resonance: production, narrow resonance, Higgs particle: decay modes, 51 Physical Sciences, 5107 Particle and High Energy Physics, p p: scattering, LHC, Particle Physics, Higgs Boson, Extensions of Higgs sector; Higgs bosons; Light mesons, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Higgs boson, p p, scattering, FOS: Physical sciences, bottom: pair production, 530, TeV, Hadron-hadron scattering ; Higgs boson, Branching ratio: upper limit, Experimental results, background, P p: colliding beams, Light mesons, 500, Dimuon: mass spectrum, pseudoscalar particle: pair production, Higgs particle: branching ratio, mass spectrum: (muon+ muon-), Background, Muon: pair production, Mass spectrum: (muon+ muon-), Extensions of Higgs sector, 5106 Nuclear and Plasma Physics, Bottom: pair production, p p: colliding beams, muon, pair, 500.2, resonance: production, experimental results

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