Measurement of the $$H \rightarrow \gamma \gamma $$ and $$H \rightarrow ZZ^* \rightarrow 4 \ell $$ cross-sections in pp collisions at $$\sqrt{s}=13.6$$ TeV with the ATLAS detector


Aad, G ORCID: 0000-0002-6665-4934, Abbott, B ORCID: 0000-0002-5888-2734, Abeling, K ORCID: 0000-0002-1002-1652, Abicht, NJ ORCID: 0000-0001-5763-2760, 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, Acharya, BS ORCID: 0000-0002-8588-9157 et al (show 2925 more authors) (2024) Measurement of the $$H \rightarrow \gamma \gamma $$ and $$H \rightarrow ZZ^* \rightarrow 4 \ell $$ cross-sections in pp collisions at $$\sqrt{s}=13.6$$ TeV with the ATLAS detector. The European Physical Journal C, 84 (1). 78-.

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Abstract

<jats:title>Abstract</jats:title><jats:p>The inclusive Higgs boson production cross-section is measured in the di-photon and the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ZZ^* \rightarrow 4 \ell $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>Z</mml:mi> <mml:msup> <mml:mi>Z</mml:mi> <mml:mo>∗</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mn>4</mml:mn> <mml:mi>ℓ</mml:mi> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> decay channels using 31.4 and 29.0 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 <jats:italic>pp</jats:italic> collision data respectively, collected with the ATLAS detector at a centre-of-mass energy of <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sqrt{s}=13.6$$</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>13.6</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>. To reduce the model dependence, the measurement in each channel is restricted to a particle-level phase space that closely matches the channel’s detector-level kinematic selection, and it is corrected for detector effects. These measured fiducial cross-sections are <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sigma _{\textrm{fid},\gamma \gamma } = $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>σ</mml:mi> <mml:mrow> <mml:mtext>fid</mml:mtext> <mml:mo>,</mml:mo> <mml:mi>γ</mml:mi> <mml:mi>γ</mml:mi> </mml:mrow> </mml:msub> <mml:mo>=</mml:mo> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> <jats:inline-formula><jats:alternatives><jats:tex-math>$$76^{+14}_{-13}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mn>76</mml:mn> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>13</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>14</mml:mn> </mml:mrow> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> fb, and <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sigma _{\textrm{fid},4 \ell } =$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>σ</mml:mi> <mml:mrow> <mml:mtext>fid</mml:mtext> <mml:mo>,</mml:mo> <mml:mn>4</mml:mn> <mml:mi>ℓ</mml:mi> </mml:mrow> </mml:msub> <mml:mo>=</mml:mo> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> <jats:inline-formula><jats:alternatives><jats:tex-math>$$2.80\, \pm \, 0.74$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>2.80</mml:mn> <mml:mspace /> <mml:mo>±</mml:mo> <mml:mspace /> <mml:mn>0.74</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> fb, in agreement with the corresponding Standard Model predictions of <jats:inline-formula><jats:alternatives><jats:tex-math>$$67.6 \pm 3.7 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>67.6</mml:mn> <mml:mo>±</mml:mo> <mml:mn>3.7</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> fb and <jats:inline-formula><jats:alternatives><jats:tex-math>$$3.67 \pm 0.19 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>3.67</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.19</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> fb. Assuming Standard Model acceptances and branching fractions for the two channels, the fiducial measurements are extrapolated to the full phase space yielding total cross-sections of <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sigma (pp \rightarrow H) = 67^{+12}_{-11}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>σ</mml:mi> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>p</mml:mi> <mml:mi>p</mml:mi> <mml:mo>→</mml:mo> <mml:mi>H</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mn>67</mml:mn> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>11</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>12</mml:mn> </mml:mrow> </mml:msubsup> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> pb and <jats:inline-formula><jats:alternatives><jats:tex-math>$$46 \pm 12$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>46</mml:mn> <mml:mo>±</mml:mo> <mml:mn>12</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> pb at 13.6 <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> from the di-photon and <jats:inline-formula><jats:alternatives><jats:tex-math>$$ZZ^* \rightarrow 4 \ell $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>Z</mml:mi> <mml:msup> <mml:mi>Z</mml:mi> <mml:mo>∗</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mn>4</mml:mn> <mml:mi>ℓ</mml:mi> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> measurements respectively. The two measurements are combined into a total cross-section measurement of <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sigma (pp \rightarrow H)= 58.2 \pm 8.7$$</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>p</mml:mi> <mml:mi>p</mml:mi> <mml:mo>→</mml:mo> <mml:mi>H</mml:mi> <mml:mo>)</mml:mo> <mml:mo>=</mml:mo> <mml:mn>58.2</mml:mn> <mml:mo>±</mml:mo> <mml:mn>8.7</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> pb, to be compared with the Standard Model prediction of <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sigma (pp \rightarrow H)_\textrm{SM} = 59.9 \pm 2.6 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>σ</mml:mi> <mml:msub> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>p</mml:mi> <mml:mi>p</mml:mi> <mml:mo>→</mml:mo> <mml:mi>H</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mtext>SM</mml:mtext> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>59.9</mml:mn> <mml:mo>±</mml:mo> <mml:mn>2.6</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> pb.</jats:p>

Item Type: Article
Divisions: Faculty of Health and Life Sciences
Faculty of Science and Engineering > School of Physical Sciences
Faculty of Health and Life Sciences > Institute of Systems, Molecular and Integrative Biology
Depositing User: Symplectic Admin
Date Deposited: 16 Feb 2024 09:51
Last Modified: 18 Mar 2024 03:45
DOI: 10.1140/epjc/s10052-023-12130-5
Open Access URL: https://link.springer.com/article/10.1140/epjc/s10...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3178687
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