psi(2S) analysis paper

Updated on Wed, 2024-03-27 21:35. Originally created by wy157543 on 2024-03-27 21:35.

<h2 class="rtecenter">Measurement of J/psi production in Au+Au collisions at √s<sub>NN</sub> = 54.4 GeV with STAR experiment</h2>

<h2 class="rtecenter">PAs: Yuanjing Ji, Rongrong Ma, Kaifeng Shen, Zebo Tang, Wangmei Zha</h2>

<h2 class="rtecenter">Target Journal: Phys. Lett. B</h2>

<h2>Abstract:</h2>

We present the measurements of inclusive J/psi production at midrapidity (|y| < 1.0) in Au+Au collisions at √s<sub>NN</sub> = 54.4 GeV with the STAR detector at the Relativistic Heavy Ion Collider. <span>A suppression of J/psi production is observed in Au+Au collisions at </span><span>√s</span><sub>NN</sub><span> = 54.4 GeV comparing to the scaled production in p+p collisions.</span> The dependences of nuclear modification factor (R<sub>AA</sub>) on centrality and transverse momentum (p<sub>T</sub>) are measured with improved precision compared to previous measurements at 39 and 62.4 GeV. No significant energy dependence of R<sub>AA</sub> is found within uncertainties up to 200 GeV. The comparision to model calculations is presented and its physical implications are discussed  

<h2>Figures:</h2>

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<td><font size="4"> Figure 1. Invariant mass distributions of J/psi candidates for 0 < p<sub>T</sub> < 10 GeV/c reconstructed via the di-electron channel for | y | < 1. The black open circles are unlike sign from same event; The blue triangles are like sign from same event; The red line stands for the combinatorial background from unlike-sign mixed-event, and the black full squares are di-electron signal with the combinatorial background subtracted. The J/psi signal shape from embedding with additional momentum smearing is used to fit the di-electron signal and the residual background is described by a straight line. </font></td>

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<td><font size="4"> Figure 2. J/psi invariant yields in Au+Au collisions at √s<sub>NN</sub> = 54.4 GeV as a function of p<sub>T</sub> for different centralities. The error bars represent the statistical uncertainties. The boxes represent the systematic uncertainties. A pT > 0.2 GeV/c cut is added to exclude coherent photon induced production. </font></td>

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<td><font size="4"> Figure 3. The R<sub>AA</sub> of inclusive J/psi as a function of N<sub>part</sub> in Au+Au collisions at different collision energies at mid-rapidity. The error bars represent the statistical uncertainties. The boxes represent the systematic uncertainties. The shaded bands on the data points indicate the uncertainties from the nuclear overlap function T<sub>AA</sub>. The bands around unity indicate the uncertainties from the p+p baselines. Suppression of the J/psi production is observed in Au+Au collisions at 54.4 GeV with improved precision compared to previous results at 39 and 62.4 GeV. </font></td>

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<td><font size="4"> Figure 4. The R<sub>AA</sub> of J/psi as a function of collision energy for central collisions, in comparison with model calculations. The error bars represent the statistical uncertainties and the boxes represent the systematic uncertainties, including those from p+p baselines and uncertainties from T<sub>AA</sub>. There is no significant energy dependence within uncertainties from SPS to RHIC top energy. </font></td>

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<td><font size="4">Figure 5a. The inclusive J/psi R<sub>AA</sub> as a function of p<sub>T</sub> in Au+Au collisions for different collision energies in 0-60% centrality. Figure 5b. The inclusive J/psi R<sub>AA</sub> as a function of p<sub>T</sub> in Au+Au collisions for different centrality bins at 54.4 GeV. The error bars represent the statistical uncertainties. The boxes represent the systematic uncertainties. The bands around unity indicate the uncertainties from the T<sub>AA</sub> and the p+p baselines. A larger suppression is observed at lower pT and towards more central collisions. </font></td>

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<td><font size="4">Figure 7. The inclusive J/psi r<sub>AA</sub> as a function of N<sub>part</sub> in different collision systems at mid-rapidity. The error bars represent the statistical uncertainties. The boxes represent the systematic uncertainties. The r<sub>AA</sub> distribution at 54.4 GeV follow the trend of collision energy dependence. </font></td>

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<h2>Summary:</h2>

<p>    In summary, we report on measurements of J/psi meson production in Au+Au collisions at √s<sub>NN</sub> = 54.4 GeV with the STAR detector at RHIC.</p>

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<li>The N<sub>part</sub> dependence of R<sub>AA</sub> show a suppression in central Au+Au collisions at √s<sub>NN</sub> = 54.4 GeV</li>

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<li>Newly measured R<sub>AA</sub> for J/psi meson at √s<sub>NN</sub> = 54.4 GeV is shown as s function of N<sub>part</sub> and p<sub>T</sub> with improved precision compared to previous measurements at 39 and 62.4 GeV</li>

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<li>No significant energy dependence of R<sub>AA</sub> in central collisions from 17.2 to 200 GeV within uncertainties is observed</li>

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<li>A larger suppression is observed at lower pT and towards more central collisions</li>

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<li>The mean p<sub>T</sub> square and r<sub>AA</sub> distributions at 54.4 GeV follow the trend of collision energy dependence</li>

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<h2>PWG REVIEW:</h2>

<p>Replies to Nihar's comments:</p>

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<li>https://drupal.star.bnl.gov/STAR/system/files/Nihar_v1.pdf</li>

</ul>

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<li>https://drupal.star.bnl.gov/STAR/system/files/paper_draft_54p5_Jpsi_v15_diff_with_v14.pdf</li>

</ul>

<p>Replies to Yi's comments:</p>

<ul>

<li>https://drupal.star.bnl.gov/STAR/system/files/Reply_Yi_v1.pdf</li>

</ul>

<ul>

<li>https://drupal.star.bnl.gov/STAR/system/files/paper_draft_54p5_Jpsi_v16_diff_with_v14.pdf</li>

</ul>

<h2>Related presentations:</h2>

<p>    Here is a summary of links about related presentations on pwg meeting.</p>

<ul>

<li>https://drupal.star.bnl.gov/STAR/system/files/2020_04_23_kaifeng.pdf</li>

</ul>

<ul>

<li>https://drupal.star.bnl.gov/STAR/system/files/HF_Kaifeng_v8.pdf （collaboration meeting）</li>

</ul>

<ul>

<li>https://drupal.star.bnl.gov/STAR/system/files/Collaboration_meeting_Kaifeng_20210302_v6.pdf （collaboration meeting）</li>

</ul>

<ul>

<li>https://drupal.star.bnl.gov/STAR/system/files/20210422_Kaifeng_v2_1.pdf</li>

</ul>

<ul>

<li>https://drupal.star.bnl.gov/STAR/system/files/20210505_preliminary_Kaifeng_v3.pdf</li>

</ul>

<ul>

<li>https://drupal.star.bnl.gov/STAR/meetings/star-analysis-meeting-june-2021/plenary-session-iii/hf-highlight-jpsi-raa-544-gev-auau-coll （analysis meeting）</li>

</ul>

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<li>https://drupal.star.bnl.gov/STAR/meetings/star-collaboration-meeting-september-2021/heavy-flavor-pwg-parallel-session-i/paper-proposa （paper proposal， collaboration meeting）</li>

</ul>

<ul>

<li>https://drupal.star.bnl.gov/STAR/system/files/mean_pT_54p4_v6.pdf</li>

</ul>

<h2>Analysis note:</h2>

<p>    Here is the link of analysis note.</p>

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<li>https://drupal.star.bnl.gov/STAR/system/files/analysis_note_for_inclusive_Jpsi_production_in_AuAu_collisions_at_54_4_GeV_v7.pdf</li>

</ul>

<h2>Paper draft:</h2>

<p>    Here is the link of paper draft.</p>

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<li>https://drupal.star.bnl.gov/STAR/system/files/paper_draft_54p5_Jpsi_v16.pdf</li>

</ul>

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psi(2S) analysis paper