Search for Higgs boson pair production in association with a vector boson in pp collisions at $$\sqrt{s}=13\,\text {TeV}$$ with the ATLAS detector


Aad, G ORCID: 0000-0002-6665-4934, Abbott, B ORCID: 0000-0002-5888-2734, Abbott, DC ORCID: 0000-0002-7248-3203, Abeling, K ORCID: 0000-0002-1002-1652, Abidi, SH ORCID: 0000-0002-8496-9294, Aboulhorma, A ORCID: 0000-0002-9987-2292, Abramowicz, H ORCID: 0000-0001-5329-6640, Abreu, H ORCID: 0000-0002-1599-2896, Abulaiti, Y ORCID: 0000-0003-0403-3697, Hoffman, AC Abusleme ORCID: 0000-0003-0762-7204 et al (show 2925 more authors) (2023) Search for Higgs boson pair production in association with a vector boson in pp collisions at $$\sqrt{s}=13\,\text {TeV}$$ with the ATLAS detector. The European Physical Journal C, 83 (6). 519-.

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Abstract

<jats:title>Abstract</jats:title><jats:p>This paper reports a search for Higgs boson pair (<jats:italic>hh</jats:italic>) production in association with a vector boson (<jats:inline-formula><jats:alternatives><jats:tex-math>$$W\; {\text {o}r}\; Z$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>W</mml:mi> <mml:mspace /> <mml:mrow> <mml:mtext>o</mml:mtext> <mml:mi>r</mml:mi> </mml:mrow> <mml:mspace /> <mml:mi>Z</mml:mi> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula>) using 139 fb<jats:inline-formula><jats:alternatives><jats:tex-math>$$^{-1}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula> of proton–proton collision data at <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sqrt{s}=13\,\text {TeV}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> <mml:mspace /> <mml:mtext>TeV</mml:mtext> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> recorded with the ATLAS detector at the Large Hadron Collider. The search is performed in final states in which the vector boson decays leptonically (<jats:inline-formula><jats:alternatives><jats:tex-math>$$W\rightarrow \ell \nu ,\, Z\rightarrow \ell \ell ,\nu \nu $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>W</mml:mi> <mml:mo>→</mml:mo> <mml:mi>ℓ</mml:mi> <mml:mi>ν</mml:mi> <mml:mo>,</mml:mo> <mml:mspace /> <mml:mi>Z</mml:mi> <mml:mo>→</mml:mo> <mml:mi>ℓ</mml:mi> <mml:mi>ℓ</mml:mi> <mml:mo>,</mml:mo> <mml:mi>ν</mml:mi> <mml:mi>ν</mml:mi> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> with <jats:inline-formula><jats:alternatives><jats:tex-math>$$\ell =e, \mu $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>ℓ</mml:mi> <mml:mo>=</mml:mo> <mml:mi>e</mml:mi> <mml:mo>,</mml:mo> <mml:mi>μ</mml:mi> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula>) and the Higgs bosons each decay into a pair of <jats:italic>b</jats:italic>-quarks. It targets <jats:italic>Vhh</jats:italic> signals from both non-resonant <jats:italic>hh</jats:italic> production, present in the Standard Model (SM), and resonant <jats:italic>hh</jats:italic> production, as predicted in some SM extensions. A 95% confidence-level upper limit of 183 (87) times the SM cross-section is observed (expected) for non-resonant <jats:italic>Vhh</jats:italic> production when assuming the kinematics are as expected in the SM. Constraints are also placed on Higgs boson coupling modifiers. For the resonant search, upper limits on the production cross-sections are derived for two specific models: one is the production of a vector boson along with a neutral heavy scalar resonance <jats:italic>H</jats:italic>, in the mass range 260–1000 GeV, that decays into <jats:italic>hh</jats:italic>, and the other is the production of a heavier neutral pseudoscalar resonance <jats:italic>A</jats:italic> that decays into a <jats:italic>Z</jats:italic> boson and <jats:italic>H</jats:italic> boson, where the <jats:italic>A</jats:italic> boson mass is 360–800 GeV and the <jats:italic>H</jats:italic> boson mass is 260–400 GeV. Constraints are also derived in the parameter space of two-Higgs-doublet models.</jats:p>

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 03 Jul 2023 09:05
Last Modified: 18 Mar 2024 03:54
DOI: 10.1140/epjc/s10052-023-11559-y
Open Access URL: https://link.springer.com/article/10.1140/epjc/s10...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3171401
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