Measurements of low-p(T) electrons from semileptonic heavy-flavour hadron decays at mid-rapidity in pp and Pb-Pb collisions at root s(NN)=2.A76 TeV



Acharya, S, Acosta, FT, Adamova, D, Adolfsson, J, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU
et al (show 1007 more authors) (2018) Measurements of low-p(T) electrons from semileptonic heavy-flavour hadron decays at mid-rapidity in pp and Pb-Pb collisions at root s(NN)=2.A76 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2018 (10). 61-.

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

Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>Transverse-momentum (<jats:italic>p</jats:italic> <jats:sub>T</jats:sub>) differential yields of electrons from semileptonic heavy-flavour hadron decays have been measured in the most central (0–10%) and in semi-central (20–40%) Pb–Pb collisions at <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \sqrt{s_{\mathrm{NN}}}=2.76 $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mrow> <mml:mi>N</mml:mi> <mml:mi>N</mml:mi> </mml:mrow> </mml:msub> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>2.76</mml:mn> </mml:math> </jats:alternatives> </jats:inline-formula> TeV. The corresponding production cross section in pp collisions has been measured at the same energy with substantially reduced systematic uncertainties with respect to previously published results. The modification of the yield in Pb–Pb collisions with respect to the expectation from an incoherent superposition of nucleon-nucleon collisions is quantified at mid-rapidity (|<jats:italic>y</jats:italic>| &lt; 0.8) in the <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> interval 0.5–3 GeV/<jats:italic>c</jats:italic> via the nuclear modification factor, <jats:italic>R</jats:italic> <jats:sub>AA</jats:sub>. This paper extends the <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> reach of the <jats:italic>R</jats:italic> <jats:sub>AA</jats:sub> measurement towards significantly lower values with respect to a previous publication. In Pb–Pb collisions the <jats:italic>p</jats:italic> <jats:sub>T</jats:sub>-differential measurements of yields at low <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> are essential to investigate the scaling of heavy-flavour production with the number of binary nucleon-nucleon collisions. Heavy-quark hadronization, a collective expansion and even initial-state effects, such as the nuclear modification of the Parton Distribution Function, are also expected to have a significant effect on the measured distribution. </jats:p>

Item Type: Article
Uncontrolled Keywords: Heavy Ion Experiments
Depositing User: Symplectic Admin
Date Deposited: 08 May 2019 09:19
Last Modified: 14 Mar 2024 21:19
DOI: 10.1007/JHEP10(2018)061
Open Access URL: https://doi.org/10.1007/JHEP10(2018)061
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3040224