Charged-particle nuclear modification factors in XeXe collisions at root S-NN=5.44 TeV

Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Asilar, E, Bergauer, T, Brandstetter, J, Dragicevic, M, Ero, J, Del Valle, A Escalante
et al (show 2307 more authors) (2018) Charged-particle nuclear modification factors in XeXe collisions at root S-NN=5.44 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2018 (10). 138-.

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


<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>The differential yields of charged particles having pseudorapidity within |<jats:italic>η</jats:italic>| &lt; 1 are measured using xenon-xenon (XeXe) collisions at <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \sqrt{s_{\mathrm{NN}}} = 5.44 $$</jats:tex-math> <mml:math xmlns:mml=""> <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:mspace /> <mml:mn>5.44</mml:mn> </mml:math> </jats:alternatives> </jats:inline-formula> TeV. The data, corresponding to an integrated luminosity of 3.42 <jats:italic>μ</jats:italic>b<jats:sup>−1</jats:sup>, were collected in 2017 by the CMS experiment at the LHC. The yields are reported as functions of collision centrality and transverse momentum, <jats:italic>p</jats:italic> <jats:sub>T</jats:sub>, from 0.5 to 100 GeV. A previously reported <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> spectrum from proton-proton collisions at <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \sqrt{s}=5.02 $$</jats:tex-math> <mml:math xmlns:mml=""> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>5.02</mml:mn> </mml:math> </jats:alternatives> </jats:inline-formula> TeV is used for comparison after correcting for the difference in center-of-mass energy. The nuclear modification factors using this reference, <jats:italic>R</jats:italic> <jats:sub>AA</jats:sub> <jats:sup>*</jats:sup> , are constructed and compared to previous measurements and theoretical predictions. In head-on collisions, the <jats:italic>R</jats:italic> <jats:sub>AA</jats:sub> <jats:sup>*</jats:sup> has a value of 0.17 in the <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> range of 6–8 GeV, but increases to approximately 0.7 at 100 GeV. Above ≈6 GeV, the XeXe data show a notably smaller suppression than previous results for lead-lead (PbPb) collisions at <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \sqrt{s_{\mathrm{NN}}}=5.02 $$</jats:tex-math> <mml:math xmlns:mml=""> <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>5.02</mml:mn> </mml:math> </jats:alternatives> </jats:inline-formula> TeV when compared at the same centrality (i.e., the same fraction of total cross section). However, the XeXe suppression is slightly greater than that for PbPb in events having a similar number of participating nucleons. </jats:p>

Item Type: Article
Uncontrolled Keywords: Hadron-Hadron scattering (experiments), Heavy-ion collision, Quark gluon plasma
Depositing User: Symplectic Admin
Date Deposited: 07 Feb 2019 14:09
Last Modified: 17 Mar 2024 01:17
DOI: 10.1007/JHEP10(2018)138
Open Access URL:
Related URLs: