Search for a heavy Higgs boson decaying into a <i>Z</i> boson and another heavy Higgs boson in the <i>llbb</i> and <i>llWW</i> final states in <i>pp</i> collisions at √<i>s</i>=13 TeV with the ATLAS detector



Aad, G, Abbott, B, Abbott, DC, Abud, A Abed, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2918 more authors) (2021) Search for a heavy Higgs boson decaying into a <i>Z</i> boson and another heavy Higgs boson in the <i>llbb</i> and <i>llWW</i> final states in <i>pp</i> collisions at √<i>s</i>=13 TeV with the ATLAS detector. EUROPEAN PHYSICAL JOURNAL C, 81 (5). 396-.

Access the full-text of this item by clicking on the Open Access link.

Abstract

<jats:title>Abstract</jats:title><jats:p>A search for a heavy neutral Higgs boson,<jats:italic>A</jats:italic>, decaying into a<jats:italic>Z</jats:italic>boson and another heavy Higgs boson,<jats:italic>H</jats:italic>, is performed using a data sample corresponding to an integrated luminosity of 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>from proton–proton collisions at<jats:inline-formula><jats:alternatives><jats:tex-math>$$\sqrt{s} = 13$$</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:mrow></mml:math></jats:alternatives></jats:inline-formula> <jats:inline-formula><jats:alternatives><jats:tex-math>$$\text {TeV}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mtext>TeV</mml:mtext></mml:math></jats:alternatives></jats:inline-formula>recorded by the ATLAS detector at the LHC. The search considers the<jats:italic>Z</jats:italic>boson decaying into electrons or muons and the<jats:italic>H</jats:italic>boson into a pair of<jats:italic>b</jats:italic>-quarks or<jats:italic>W</jats:italic>bosons. The mass range considered is 230–800 <jats:inline-formula><jats:alternatives><jats:tex-math>$$\text {GeV}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mtext>GeV</mml:mtext></mml:math></jats:alternatives></jats:inline-formula>for the<jats:italic>A</jats:italic>boson and 130–700 <jats:inline-formula><jats:alternatives><jats:tex-math>$$\text {GeV}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mtext>GeV</mml:mtext></mml:math></jats:alternatives></jats:inline-formula>for the<jats:italic>H</jats:italic>boson. The data are in good agreement with the background predicted by the Standard Model, and therefore 95% confidence-level upper limits for<jats:inline-formula><jats:alternatives><jats:tex-math>$$\sigma \times B(A\rightarrow ZH)\times B(H\rightarrow bb \; \text {or} \; H \rightarrow WW)$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>σ</mml:mi><mml:mo>×</mml:mo><mml:mi>B</mml:mi><mml:mo>(</mml:mo><mml:mi>A</mml:mi><mml:mo>→</mml:mo><mml:mi>Z</mml:mi><mml:mi>H</mml:mi><mml:mo>)</mml:mo><mml:mo>×</mml:mo><mml:mi>B</mml:mi><mml:mo>(</mml:mo><mml:mi>H</mml:mi><mml:mo>→</mml:mo><mml:mi>b</mml:mi><mml:mi>b</mml:mi><mml:mspace /><mml:mtext>or</mml:mtext><mml:mspace /><mml:mi>H</mml:mi><mml:mo>→</mml:mo><mml:mi>W</mml:mi><mml:mi>W</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math></jats:alternatives></jats:inline-formula>are set. The upper limits are in the range 0.0062–0.380 pb for the<jats:inline-formula><jats:alternatives><jats:tex-math>$$H\rightarrow bb$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>H</mml:mi><mml:mo>→</mml:mo><mml:mi>b</mml:mi><mml:mi>b</mml:mi></mml:mrow></mml:math></jats:alternatives></jats:inline-formula>channel and in the range 0.023–8.9 pb for the<jats:inline-formula><jats:alternatives><jats:tex-math>$$H\rightarrow WW$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>H</mml:mi><mml:mo>→</mml:mo><mml:mi>W</mml:mi><mml:mi>W</mml:mi></mml:mrow></mml:math></jats:alternatives></jats:inline-formula>channel. An interpretation of the results in the context of two-Higgs-doublet models is also given.</jats:p>

Item Type: Article
Additional Information: 53 pages in total, author list starting page 37, 14 figures, 4 tables, published in Eur. Phys. J. C. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-13/
Uncontrolled Keywords: hep-ex, hep-ex
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 11 May 2021 07:46
Last Modified: 18 Mar 2024 04:06
DOI: 10.1140/epjc/s10052-021-09117-5
Open Access URL: https://link.springer.com/article/10.1140/epjc/s10...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3122200