Jet-like correlations with respect to KS0 and Λ (Λ ¯) in pp and central Pb–Pb collisions at √sNN=5.02 TeV



Acharya, S, Adamová, D, Adler, A, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I
et al (show 1023 more authors) (2023) Jet-like correlations with respect to KS0 and Λ (Λ ¯) in pp and central Pb–Pb collisions at √sNN=5.02 TeV. The European Physical Journal C, 83 (6). 497-.

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Abstract

<jats:title>Abstract</jats:title><jats:p>Two-particle correlations with <jats:inline-formula><jats:alternatives><jats:tex-math>$$\textrm{K}^{0}_\mathrm{{S}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mtext>K</mml:mtext> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula>, <jats:inline-formula><jats:alternatives><jats:tex-math>$$\Lambda $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>Λ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula>/<jats:inline-formula><jats:alternatives><jats:tex-math>$$\overline{\Lambda }$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mi>Λ</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math></jats:alternatives></jats:inline-formula>, and charged hadrons as trigger particles in the transverse momentum range <jats:inline-formula><jats:alternatives><jats:tex-math>$$8{&lt;}p_{{\textrm{T}},{\textrm{trig}}}{&lt;}16$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>8</mml:mn> <mml:mo>&lt;</mml:mo> <mml:msub> <mml:mi>p</mml:mi> <mml:mrow> <mml:mtext>T</mml:mtext> <mml:mo>,</mml:mo> <mml:mtext>trig</mml:mtext> </mml:mrow> </mml:msub> <mml:mo>&lt;</mml:mo> <mml:mn>16</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 associated charged particles within <jats:inline-formula><jats:alternatives><jats:tex-math>$$1{&lt;}p_{{\textrm{T}},{\textrm{assoc}}}{&lt;}8$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>1</mml:mn> <mml:mo>&lt;</mml:mo> <mml:msub> <mml:mi>p</mml:mi> <mml:mrow> <mml:mtext>T</mml:mtext> <mml:mo>,</mml:mo> <mml:mtext>assoc</mml:mtext> </mml:mrow> </mml:msub> <mml:mo>&lt;</mml:mo> <mml:mn>8</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>, are studied at midrapidity in pp and central Pb–Pb collisions at a centre-of-mass energy per nucleon–nucleon collision <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sqrt{s_{\textrm{NN}}}~=~5.02$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mtext>NN</mml:mtext> </mml:msub> </mml:msqrt> <mml:mspace /> <mml:mo>=</mml:mo> <mml:mspace /> <mml:mn>5.02</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> TeV with the ALICE detector at the LHC. After subtracting the contributions of the flow background, the per-trigger yields are extracted on both the near and away sides, and the ratio in Pb–Pb collisions with respect to pp collisions (<jats:inline-formula><jats:alternatives><jats:tex-math>$$I_{\textrm{AA}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>I</mml:mi> <mml:mtext>AA</mml:mtext> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula>) is computed. The per-trigger yield in Pb–Pb collisions on the away side is strongly suppressed to the level of <jats:inline-formula><jats:alternatives><jats:tex-math>$$I_{\textrm{AA}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>I</mml:mi> <mml:mtext>AA</mml:mtext> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula><jats:inline-formula><jats:alternatives><jats:tex-math>$$\approx 0.6$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>≈</mml:mo> <mml:mn>0.6</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> for <jats:inline-formula><jats:alternatives><jats:tex-math>$$p_{{\textrm{T}},{\textrm{assoc}}}&gt;3$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>p</mml:mi> <mml:mrow> <mml:mtext>T</mml:mtext> <mml:mo>,</mml:mo> <mml:mtext>assoc</mml:mtext> </mml:mrow> </mml:msub> <mml:mo>&gt;</mml:mo> <mml:mn>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> as expected from strong in-medium energy loss, while an enhancement develops at low <jats:inline-formula><jats:alternatives><jats:tex-math>$$p_{{\textrm{T}},{\textrm{assoc}}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>p</mml:mi> <mml:mrow> <mml:mtext>T</mml:mtext> <mml:mo>,</mml:mo> <mml:mtext>assoc</mml:mtext> </mml:mrow> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula> on both the near and away sides, reaching <jats:inline-formula><jats:alternatives><jats:tex-math>$$I_{\textrm{AA}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>I</mml:mi> <mml:mtext>AA</mml:mtext> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula><jats:inline-formula><jats:alternatives><jats:tex-math>$$\approx 1.8$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>≈</mml:mo> <mml:mn>1.8</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> and 2.7 respectively. These findings are in good agreement with previous ALICE measurements from two-particle correlations triggered by neutral pions (<jats:inline-formula><jats:alternatives><jats:tex-math>$$\pi ^{0}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>–h) and charged hadrons (h–h) in Pb–Pb collisions at <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sqrt{s_{\textrm{NN}}}~=~2.76$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mtext>NN</mml:mtext> </mml:msub> </mml:msqrt> <mml:mspace /> <mml:mo>=</mml:mo> <mml:mspace /> <mml:mn>2.76</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> TeV. Moreover, the correlations with <jats:inline-formula><jats:alternatives><jats:tex-math>$$\textrm{K}^{0}_\mathrm{{S}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mtext>K</mml:mtext> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> mesons and <jats:inline-formula><jats:alternatives><jats:tex-math>$$\Lambda $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>Λ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula>/<jats:inline-formula><jats:alternatives><jats:tex-math>$$\overline{\Lambda }$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mi>Λ</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math></jats:alternatives></jats:inline-formula> baryons as trigger particles are compared to those of inclusive charged hadrons. The results are compared with the predictions of Monte Carlo models.</jats:p>

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 02 Oct 2023 15:59
Last Modified: 20 Jun 2024 18:50
DOI: 10.1140/epjc/s10052-023-11614-8
Open Access URL: https://doi.org/10.1140/epjc/s10052-023-11614-8
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3173339