Study of J/ψ azimuthal anisotropy at forward rapidity in Pb-Pb collisions at √<i>s</i><sub>NN</sub>=5.02 TeV

Acharya, S, Acosta, FT, Adamova, D, Adler, A, Adolfsson, J, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z
et al (show 1009 more authors) (2019) Study of J/ψ azimuthal anisotropy at forward rapidity in Pb-Pb collisions at √<i>s</i><sub>NN</sub>=5.02 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2019 (2). 12-.

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<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>The second (<jats:italic>v</jats:italic> <jats:sub>2</jats:sub>) and third (<jats:italic>v</jats:italic> <jats:sub>3</jats:sub>) flow harmonic coefficients of J/<jats:italic>ψ</jats:italic> mesons are measured at forward rapidity (2.5 &lt; <jats:italic>y</jats:italic> &lt; 4.0) in Pb-Pb 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 with the ALICE detector at the LHC. Results are obtained with the scalar product method and reported as a function of transverse momentum, <jats:italic>p</jats:italic> <jats:sub>T</jats:sub>, for various collision centralities. A positive value of J/<jats:italic>ψ v</jats:italic> <jats:sub>3</jats:sub> is observed with 3.7<jats:italic>σ</jats:italic> significance. The measurements, compared to those of prompt D<jats:sup>0</jats:sup> mesons and charged particles at mid-rapidity, indicate an ordering with <jats:italic>v</jats:italic> <jats:sub>n</jats:sub>(J/<jats:italic>ψ</jats:italic>) &lt; <jats:italic>v</jats:italic> <jats:sub>n</jats:sub>(D<jats:sup>0</jats:sup>) &lt; <jats:italic>v</jats:italic> <jats:sub>n</jats:sub>(h<jats:sup>±</jats:sup>) (n = 2, 3) at low and intermediate <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> up to 6 GeV/<jats:italic>c</jats:italic> and a convergence with <jats:italic>v</jats:italic> <jats:sub>2</jats:sub>(J/<jats:italic>ψ</jats:italic>) ≈ <jats:italic>v</jats:italic> <jats:sub>2</jats:sub>(D<jats:sup>0</jats:sup>) ≈ <jats:italic>v</jats:italic> <jats:sub>2</jats:sub>(h<jats:sup>±</jats:sup>) at high <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> above 6–8 GeV/<jats:italic>c</jats:italic>. In semi-central collisions (5–40% and 10–50% centrality intervals) at intermediate <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> between 2 and 6 GeV/<jats:italic>c</jats:italic>, the ratio <jats:italic>v</jats:italic> <jats:sub>3</jats:sub>/<jats:italic>v</jats:italic> <jats:sub>2</jats:sub> of J/<jats:italic>ψ</jats:italic> mesons is found to be significantly lower (4.6<jats:italic>σ</jats:italic>) with respect to that of charged particles. In addition, the comparison to the prompt D<jats:sup>0</jats:sup>-meson ratio in the same <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> interval suggests an ordering similar to that of the <jats:italic>v</jats:italic> <jats:sub>2</jats:sub> and <jats:italic>v</jats:italic> <jats:sub>3</jats:sub> coefficients. The J/<jats:italic>ψ v</jats:italic> <jats:sub>2</jats:sub> coefficient is further studied using the Event Shape Engineering technique. The obtained results are found to be compatible with the expected variations of the eccentricity of the initial-state geometry. </jats:p>

Item Type: Article
Uncontrolled Keywords: Hadron-Hadron scattering (experiments)
Depositing User: Symplectic Admin
Date Deposited: 20 May 2019 15:56
Last Modified: 14 Mar 2024 21:05
DOI: 10.1007/JHEP02(2019)012
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