A precise measurement of the Z-boson double-differential transverse momentum and rapidity distributions in the full phase space of the decay leptons with the ATLAS experiment at $$\sqrt{s}=8$$ TeV


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, Abusleme Hoffman, AC ORCID: 0000-0003-0762-7204 et al (show 2920 more authors) (2024) A precise measurement of the Z-boson double-differential transverse momentum and rapidity distributions in the full phase space of the decay leptons with the ATLAS experiment at $$\sqrt{s}=8$$ TeV. The European Physical Journal C, 84 (3). 315-.

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

Abstract

<jats:title>Abstract</jats:title><jats:p>This paper presents for the first time a precise measurement of the production properties of the <jats:italic>Z</jats:italic> boson in the full phase space of the decay leptons. This is in contrast to the many previous precise unfolded measurements performed in the fiducial phase space of the decay leptons. The measurement is obtained from proton–proton collision data collected by the ATLAS experiment in 2012 at <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sqrt{s} = 8$$</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>8</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> TeV at the LHC and corresponding to an integrated luminosity of 20.2 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>. The results, based on a total of 15.3 million <jats:italic>Z</jats:italic>-boson decays to electron and muon pairs, extend and improve a previous measurement of the full set of angular coefficients describing <jats:italic>Z</jats:italic>-boson decay. The double-differential cross-section distributions in <jats:italic>Z</jats:italic>-boson transverse momentum <jats:inline-formula><jats:alternatives><jats:tex-math>$$p_{\text {T}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula> and rapidity <jats:inline-formula><jats:alternatives><jats:tex-math>$$y$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>y</mml:mi> </mml:math></jats:alternatives></jats:inline-formula> are measured in the pole region, defined as <jats:inline-formula><jats:alternatives><jats:tex-math>$$80&lt; m^{\ell \ell }&lt; 100$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>80</mml:mn> <mml:mo>&lt;</mml:mo> <mml:msup> <mml:mi>m</mml:mi> <mml:mrow> <mml:mi>ℓ</mml:mi> <mml:mi>ℓ</mml:mi> </mml:mrow> </mml:msup> <mml:mo>&lt;</mml:mo> <mml:mn>100</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> GeV, over the range <jats:inline-formula><jats:alternatives><jats:tex-math>$$|y| &lt; 3.6$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>|</mml:mo> <mml:mi>y</mml:mi> <mml:mo>|</mml:mo> <mml:mo>&lt;</mml:mo> <mml:mn>3.6</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula>. The total uncertainty of the normalised cross-section measurements in the peak region of the <jats:inline-formula><jats:alternatives><jats:tex-math>$$p_{\text {T}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula>  distribution is dominated by statistical uncertainties over the full range and increases as a function of rapidity from 0.5–1.0% for <jats:inline-formula><jats:alternatives><jats:tex-math>$$|y| &lt; 2.0$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>|</mml:mo> <mml:mi>y</mml:mi> <mml:mo>|</mml:mo> <mml:mo>&lt;</mml:mo> <mml:mn>2.0</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> to <jats:inline-formula><jats:alternatives><jats:tex-math>$$2-7\%$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>2</mml:mn> <mml:mo>-</mml:mo> <mml:mn>7</mml:mn> <mml:mo>%</mml:mo> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> at higher rapidities. The results for the rapidity-dependent transverse momentum distributions are compared to state-of-the-art QCD predictions, which combine in the best cases approximate N<jats:inline-formula><jats:alternatives><jats:tex-math>$$^4$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>4</mml:mn> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>LL resummation with N<jats:inline-formula><jats:alternatives><jats:tex-math>$$^3$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>3</mml:mn> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>LO fixed-order perturbative calculations. The differential rapidity distributions integrated over <jats:inline-formula><jats:alternatives><jats:tex-math>$$p_{\text {T}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula> are even more precise, with accuracies from 0.2–0.3% for <jats:inline-formula><jats:alternatives><jats:tex-math>$$|y| &lt; 2.0$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>|</mml:mo> <mml:mi>y</mml:mi> <mml:mo>|</mml:mo> <mml:mo>&lt;</mml:mo> <mml:mn>2.0</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> to 0.4–0.9% at higher rapidities, and are compared to fixed-order QCD predictions using the most recent parton distribution functions. The agreement between data and predictions is quite good in most cases.</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: 05 Apr 2024 10:53
Last Modified: 26 Apr 2024 23:47
DOI: 10.1140/epjc/s10052-024-12438-w
Open Access URL: https://link.springer.com/article/10.1140/epjc/s10...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3180104
Dimensions
Altmetric
CORE (COnnecting REpositories)