利用 UrQMD 模型研究强子相互作用对 RHIC 光束能量扫描能量中已识别粒子定向流动的影响

IF 1.5 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
Aswini Kumar Sahoo, Prabhupada Dixit, Md Nasim, Subhash Singha
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This study examines the rapidity distribution (<span><math altimg=\"eq-00001.gif\" display=\"inline\" overflow=\"scroll\"><mi>d</mi><mi>N</mi><mo stretchy=\"false\">∕</mo><mi>d</mi><mi>y</mi></math></span><span></span>), rapidity-odd directed flow (<span><math altimg=\"eq-00002.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow><mi>v</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span><span></span>) and its slope (<span><math altimg=\"eq-00003.gif\" display=\"inline\" overflow=\"scroll\"><mi>d</mi><msub><mrow><mi>v</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy=\"false\">∕</mo><mi>d</mi><mi>y</mi></math></span><span></span>) for <span><math altimg=\"eq-00004.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow><mi>π</mi></mrow><mrow><mo>±</mo></mrow></msup></math></span><span></span>, <span><math altimg=\"eq-00005.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow><mi>K</mi></mrow><mrow><mo>±</mo></mrow></msup></math></span><span></span>, p, and <span><math altimg=\"eq-00006.gif\" display=\"inline\" overflow=\"scroll\"><mover accent=\"true\"><mrow><mstyle><mtext mathvariant=\"normal\">p</mtext></mstyle></mrow><mo>̄</mo></mover></math></span><span></span> in Au+Au collisions at different collision centralities and beam energies (<span><math altimg=\"eq-00007.gif\" display=\"inline\" overflow=\"scroll\"><msqrt><mrow><msub><mrow><mi>s</mi></mrow><mrow><mstyle><mtext mathvariant=\"normal\">NN</mtext></mstyle></mrow></msub></mrow></msqrt><mo>=</mo><mn>7</mn><mo>.</mo><mn>7</mn></math></span><span></span>, 11.5, 14.5, 19.6, 27, and 39<span><math altimg=\"eq-00008.gif\" display=\"inline\" overflow=\"scroll\"><mspace width=\".17em\"></mspace></math></span><span></span>GeV) using the UrQMD model. We investigate the impact of late-stage hadronic interactions on charge-dependent <span><math altimg=\"eq-00009.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow><mi>v</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy=\"false\">(</mo><mi>y</mi><mo stretchy=\"false\">)</mo></math></span><span></span> and its slope by modifying the duration of the hadronic cascade lifetime (<span><math altimg=\"eq-00010.gif\" display=\"inline\" overflow=\"scroll\"><mi>τ</mi></math></span><span></span>). The energy dependence of <span><math altimg=\"eq-00011.gif\" display=\"inline\" overflow=\"scroll\"><mi>d</mi><msub><mrow><mi>v</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy=\"false\">∕</mo><mi>d</mi><mi>y</mi></math></span><span></span> for p (<span><math altimg=\"eq-00012.gif\" display=\"inline\" overflow=\"scroll\"><mover accent=\"true\"><mrow><mstyle><mtext mathvariant=\"normal\">p</mtext></mstyle></mrow><mo>̄</mo></mover></math></span><span></span>) exhibits distinct pattern compared to <span><math altimg=\"eq-00013.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow><mi>π</mi></mrow><mrow><mo>±</mo></mrow></msup></math></span><span></span> and <span><math altimg=\"eq-00014.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow><mi>K</mi></mrow><mrow><mo>±</mo></mrow></msup></math></span><span></span>. Notably, we observe a change in the sign reversal position of proton <span><math altimg=\"eq-00015.gif\" display=\"inline\" overflow=\"scroll\"><mi>d</mi><msub><mrow><mi>v</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy=\"false\">∕</mo><mi>d</mi><mi>y</mi></math></span><span></span> at different beam energies with varying <span><math altimg=\"eq-00016.gif\" display=\"inline\" overflow=\"scroll\"><mi>τ</mi></math></span><span></span> in central and mid-central collisions. Moreover, the difference in <span><math altimg=\"eq-00017.gif\" display=\"inline\" overflow=\"scroll\"><mi>d</mi><msub><mrow><mi>v</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy=\"false\">∕</mo><mi>d</mi><mi>y</mi></math></span><span></span> between positively and negatively charged hadrons (<span><math altimg=\"eq-00018.gif\" display=\"inline\" overflow=\"scroll\"><mi mathvariant=\"normal\">Δ</mi><mi>d</mi><msub><mrow><mi>v</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy=\"false\">∕</mo><mi>d</mi><mi>y</mi></math></span><span></span>) demonstrates a stark centrality dependence for different particle species. The deuteron displays a significant increase in <span><math altimg=\"eq-00019.gif\" display=\"inline\" overflow=\"scroll\"><mi>d</mi><msub><mrow><mi>v</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy=\"false\">∕</mo><mi>d</mi><mi>y</mi></math></span><span></span> with increasing <span><math altimg=\"eq-00020.gif\" display=\"inline\" overflow=\"scroll\"><mi>τ</mi></math></span><span></span> compared to <i>p</i> and <i>n</i>. This investigation underscores the importance of considering the temporal evolution and duration of the hadronic phase when interpreting the sign reversal, charge splitting of <span><math altimg=\"eq-00021.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow><mi>v</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span><span></span> and light nuclei formation at lower RHIC energies.</p>","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":null,"pages":null},"PeriodicalIF":1.5000,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Examining the influence of hadronic interactions on the directed flow of identified particles in RHIC Beam Energy Scan energies using UrQMD model\",\"authors\":\"Aswini Kumar Sahoo, Prabhupada Dixit, Md Nasim, Subhash Singha\",\"doi\":\"10.1142/s0217732324500159\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The directed flow of identified particles can serve as a sensitive tool for investigating the interactions during initial and final states in heavy ion collisions. This study examines the rapidity distribution (<span><math altimg=\\\"eq-00001.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><mi>d</mi><mi>N</mi><mo stretchy=\\\"false\\\">∕</mo><mi>d</mi><mi>y</mi></math></span><span></span>), rapidity-odd directed flow (<span><math altimg=\\\"eq-00002.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><msub><mrow><mi>v</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span><span></span>) and its slope (<span><math altimg=\\\"eq-00003.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><mi>d</mi><msub><mrow><mi>v</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy=\\\"false\\\">∕</mo><mi>d</mi><mi>y</mi></math></span><span></span>) for <span><math altimg=\\\"eq-00004.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><msup><mrow><mi>π</mi></mrow><mrow><mo>±</mo></mrow></msup></math></span><span></span>, <span><math altimg=\\\"eq-00005.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><msup><mrow><mi>K</mi></mrow><mrow><mo>±</mo></mrow></msup></math></span><span></span>, p, and <span><math altimg=\\\"eq-00006.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><mover accent=\\\"true\\\"><mrow><mstyle><mtext mathvariant=\\\"normal\\\">p</mtext></mstyle></mrow><mo>̄</mo></mover></math></span><span></span> in Au+Au collisions at different collision centralities and beam energies (<span><math altimg=\\\"eq-00007.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><msqrt><mrow><msub><mrow><mi>s</mi></mrow><mrow><mstyle><mtext mathvariant=\\\"normal\\\">NN</mtext></mstyle></mrow></msub></mrow></msqrt><mo>=</mo><mn>7</mn><mo>.</mo><mn>7</mn></math></span><span></span>, 11.5, 14.5, 19.6, 27, and 39<span><math altimg=\\\"eq-00008.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><mspace width=\\\".17em\\\"></mspace></math></span><span></span>GeV) using the UrQMD model. We investigate the impact of late-stage hadronic interactions on charge-dependent <span><math altimg=\\\"eq-00009.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><msub><mrow><mi>v</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy=\\\"false\\\">(</mo><mi>y</mi><mo stretchy=\\\"false\\\">)</mo></math></span><span></span> and its slope by modifying the duration of the hadronic cascade lifetime (<span><math altimg=\\\"eq-00010.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><mi>τ</mi></math></span><span></span>). The energy dependence of <span><math altimg=\\\"eq-00011.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><mi>d</mi><msub><mrow><mi>v</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy=\\\"false\\\">∕</mo><mi>d</mi><mi>y</mi></math></span><span></span> for p (<span><math altimg=\\\"eq-00012.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><mover accent=\\\"true\\\"><mrow><mstyle><mtext mathvariant=\\\"normal\\\">p</mtext></mstyle></mrow><mo>̄</mo></mover></math></span><span></span>) exhibits distinct pattern compared to <span><math altimg=\\\"eq-00013.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><msup><mrow><mi>π</mi></mrow><mrow><mo>±</mo></mrow></msup></math></span><span></span> and <span><math altimg=\\\"eq-00014.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><msup><mrow><mi>K</mi></mrow><mrow><mo>±</mo></mrow></msup></math></span><span></span>. Notably, we observe a change in the sign reversal position of proton <span><math altimg=\\\"eq-00015.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><mi>d</mi><msub><mrow><mi>v</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy=\\\"false\\\">∕</mo><mi>d</mi><mi>y</mi></math></span><span></span> at different beam energies with varying <span><math altimg=\\\"eq-00016.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><mi>τ</mi></math></span><span></span> in central and mid-central collisions. Moreover, the difference in <span><math altimg=\\\"eq-00017.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><mi>d</mi><msub><mrow><mi>v</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy=\\\"false\\\">∕</mo><mi>d</mi><mi>y</mi></math></span><span></span> between positively and negatively charged hadrons (<span><math altimg=\\\"eq-00018.gif\\\" display=\\\"inline\\\" overflow=\\\"scroll\\\"><mi mathvariant=\\\"normal\\\">Δ</mi><mi>d</mi><msub><mrow><mi>v</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy=\\\"false\\\">∕</mo><mi>d</mi><mi>y</mi></math></span><span></span>) demonstrates a stark centrality dependence for different particle species. 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引用次数: 0

摘要

已识别粒子的定向流可以作为研究重离子碰撞初始状态和最终状态期间相互作用的灵敏工具。本研究利用 UrQMD 模型研究了不同碰撞中心度和束流能量(sNN=7.7、11.5、14.5、19.6、27 和 39GeV)下 Au+Au 对撞中 π±、K±、p 和 p̄ 的快速性分布(dN∕dy)、快速性-非定向流(v1)及其斜率(dv1∕dy)。我们通过修改强子级联寿命(τ)的持续时间,研究了后期强子相互作用对电荷依赖性 v1(y) 及其斜率的影响。与π±和K±相比,p(p̄)的dv1∕dy的能量依赖性表现出不同的模式。值得注意的是,我们观察到质子 dv1∕dy的符号反转位置在不同束流能量下的变化。此外,带正电荷和带负电荷的强子之间的 dv1∕dy 差异(Δdv1∕dy)显示了不同粒子种类对中心性的明显依赖。与 p 和 n 相比,氘核的 dv1∕dy 随着 τ 的增大而显著增加。这项研究强调了在较低 RHIC 能量下解释符号反转、v1 的电荷分裂和轻核形成时考虑强子阶段的时间演变和持续时间的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Examining the influence of hadronic interactions on the directed flow of identified particles in RHIC Beam Energy Scan energies using UrQMD model

The directed flow of identified particles can serve as a sensitive tool for investigating the interactions during initial and final states in heavy ion collisions. This study examines the rapidity distribution (dNdy), rapidity-odd directed flow (v1) and its slope (dv1dy) for π±, K±, p, and p̄ in Au+Au collisions at different collision centralities and beam energies (sNN=7.7, 11.5, 14.5, 19.6, 27, and 39GeV) using the UrQMD model. We investigate the impact of late-stage hadronic interactions on charge-dependent v1(y) and its slope by modifying the duration of the hadronic cascade lifetime (τ). The energy dependence of dv1dy for p (p̄) exhibits distinct pattern compared to π± and K±. Notably, we observe a change in the sign reversal position of proton dv1dy at different beam energies with varying τ in central and mid-central collisions. Moreover, the difference in dv1dy between positively and negatively charged hadrons (Δdv1dy) demonstrates a stark centrality dependence for different particle species. The deuteron displays a significant increase in dv1dy with increasing τ compared to p and n. This investigation underscores the importance of considering the temporal evolution and duration of the hadronic phase when interpreting the sign reversal, charge splitting of v1 and light nuclei formation at lower RHIC energies.

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来源期刊
Modern Physics Letters A
Modern Physics Letters A 物理-物理:核物理
CiteScore
3.10
自引率
7.10%
发文量
186
审稿时长
3 months
期刊介绍: This letters journal, launched in 1986, consists of research papers covering current research developments in Gravitation, Cosmology, Astrophysics, Nuclear Physics, Particles and Fields, Accelerator physics, and Quantum Information. A Brief Review section has also been initiated with the purpose of publishing short reports on the latest experimental findings and urgent new theoretical developments.
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