Investigating charm production and fragmentation via azimuthal correlations of prompt D mesons with charged particles in pp collisions at √<i>s</i>=13 TeV



Acharya, S, Adamova, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU
et al (show 1007 more authors) (2022) Investigating charm production and fragmentation via azimuthal correlations of prompt D mesons with charged particles in pp collisions at √<i>s</i>=13 TeV. EUROPEAN PHYSICAL JOURNAL C, 82 (4). 335-.

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Abstract

<jats:title>Abstract</jats:title><jats:p>Angular correlations of heavy-flavour and charged particles in high-energy proton–proton collisions are sensitive to the production mechanisms of heavy quarks and to their fragmentation as well as hadronisation processes. The measurement of the azimuthal-correlation function of prompt D mesons with charged particles in proton–proton collisions at a centre-of-mass energy of <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> TeV with the ALICE detector is reported, considering <jats:inline-formula><jats:alternatives><jats:tex-math>$$\mathrm D^{0} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>, <jats:inline-formula><jats:alternatives><jats:tex-math>$$\mathrm D^{+} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>D</mml:mi> <mml:mo>+</mml:mo> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>, and <jats:inline-formula><jats:alternatives><jats:tex-math>$$\mathrm D^{*+} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>D</mml:mi> <mml:mrow> <mml:mrow /> <mml:mo>∗</mml:mo> <mml:mo>+</mml:mo> </mml:mrow> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula> mesons in the transverse-momentum interval <jats:inline-formula><jats:alternatives><jats:tex-math>$$3&lt; p_{\mathrm{T}} &lt; 36$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>3</mml:mn> <mml:mo>&lt;</mml:mo> <mml:msub> <mml:mi>p</mml:mi> <mml:mi>T</mml:mi> </mml:msub> <mml:mo>&lt;</mml:mo> <mml:mn>36</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> GeV/<jats:inline-formula><jats:alternatives><jats:tex-math>$$c$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>c</mml:mi> </mml:math></jats:alternatives></jats:inline-formula> at midrapidity (<jats:inline-formula><jats:alternatives><jats:tex-math>$$|y| &lt; 0.5$$</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>0.5</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula>), and charged particles with <jats:inline-formula><jats:alternatives><jats:tex-math>$$p_{\mathrm{T}} &gt; 0.3$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>p</mml:mi> <mml:mi>T</mml:mi> </mml:msub> <mml:mo>&gt;</mml:mo> <mml:mn>0.3</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> GeV/<jats:inline-formula><jats:alternatives><jats:tex-math>$$c$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>c</mml:mi> </mml:math></jats:alternatives></jats:inline-formula> and pseudorapidity <jats:inline-formula><jats:alternatives><jats:tex-math>$$|\eta | &lt; 0.8$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>|</mml:mo> <mml:mi>η</mml:mi> <mml:mo>|</mml:mo> <mml:mo>&lt;</mml:mo> <mml:mn>0.8</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula>. This measurement has an improved precision and provides an extended transverse-momentum coverage compared to previous ALICE measurements at lower energies. The study is also performed as a function of the charged-particle multiplicity, showing no modifications of the correlation function with multiplicity within uncertainties. The properties and the transverse-momentum evolution of the near- and away-side correlation peaks are studied and compared with predictions from various Monte Carlo event generators. Among those considered, PYTHIA8 and POWHEG+PYTHIA8 provide the best description of the measured observables. The obtained results can provide guidance on tuning the generators.</jats:p>

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 5110 Synchrotrons and Accelerators, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 11 Oct 2022 13:23
Last Modified: 20 Jun 2024 18:54
DOI: 10.1140/epjc/s10052-022-10267-3
Open Access URL: https://link.springer.com/article/10.1140/epjc/s10...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3165361