Measurement of system size dependence of directed flow of protons (anti-protons) at RHIC

Updated on Fri, 2025-04-04 08:39. Originally created by mftaseer on 2025-04-04 06:48.

Title: Measurement of system size dependence of directed flow of protons (anti-protons) at RHIC

PAs: Jinhui Chen, Aditya Prasad Dash, Huan Huang, Hao Qiu, Diyu Shen, Subhash Singha, Aihong Tang, Muhammad Farhan Taseer and Gang Wang

Target journal: Phys. Rev. Lett.

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Abstract:

We present the rapidity dependence of directed flow (v₁) and its slope (dv₁/dy) for π^±, K^± and p(p̅) as a function of centrality in Au+Au and Isobar (Ru+Ru and Zr+Zr) collisions at √s_NN = 200 GeV, and in U+U collisions at √s_NN = 193 GeV, as measured by the STAR experiment at RHIC. The slope dv₁dy for p(p̅) and the difference Δ(dv₁dy) exhibit a clear system size dependence, with an ordering of U+U > Au+Au > Isobar (Ru+Ru and Zr+Zr), while total baryons (p+p̅) remain independent of system size. This is the first observation of system size dependence of the v₁ and (dv₁/dy) of baryons. In contrast, the inclusive particles, particularly mesons (π^±, K^±), show no dependence on system size, consistent with previous findings at RHIC [1]. The Δ(dv₁dy) pattern for protons is primarily influenced by baryon transport and electromagnetic fields. In the most central collisions, where the electromagnetic field is minimal, baryon transport can be assessed more clearly. A hydrodynamic model with an inhomogeneous baryonic profile qualitatively captures the observed system size dependence, offering insights into baryon deposition and the transport properties of the QCD medium. Additionally, in mid-central and peripheral collisions, these data can provide insights into the strength of electromagnetic fields and the conductivities of the medium [2].

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(Ru+Ru and Zr+Zr) collisions at √s_NN = 193 GeV, as measured by the STAR experiment at RHIC. The slope √s_NN = 200 GeV, and in U+U collisions at dv₁/dy for

p(p̅) and the difference ∆(dv₁/dy) exhibit a clear system size dependence, with an ordering of U+U > Au+Au > Isobar (Ru+Ru and Zr+Zr), while total baryons (p + p̅) remain independent of system size. This is the first observation of system size dependence of the v₁ and ∆(dv₁/dy) of baryons. In contrast, the inclusive particles, particularly mesons (π^± and K^±), show no dependence on system size, consistent with previous findings at RHIC [1]. The ∆(dv₁/dy) pattern for protons is primarily influenced by baryon transport and electromagnetic fields. In the most central collisions, where the electromagnetic field is minimal, baryon transport can be assessed more clearly. A hydrody namic model with an inhomogeneous baryonic profile qualitatively captures the observed system size dependence, offering insights into baryon deposition and the transport properties of the QCD medium. Additionally, in mid-central and peripheral collisions, these data can provide insights into the strength of electromagnetic fields and the conductivities of the medium [2].

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(Ru+Ru and Zr+Zr) collisions at √ sNN = 193 GeV, as measured by the STAR experiment at RHIC. The slope √ sNN = 200 GeV, and in U+U collisions at

dv1/dy for p(¯p) and the difference ∆(dv1/dy) exhibit a clear system size de

pendence, with an ordering of U+U > Au+Au > Isobar (Ru+Ru and Zr+Zr),

while total baryons (p + ¯p) remain independent of system size. This is the first

observation of system size dependence of the v1 and ∆(dv1/dy) of baryons. In

contrast, the inclusive particles, particularly mesons (π ± and K±), show no

dependence on system size, consistent with previous findings at RHIC [1]. The

∆(dv1/dy) pattern for protons is primarily influenced by baryon transport and

electromagnetic fields. In the most central collisions, where the electromagnetic

field is minimal, baryon transport can be assessed more clearly. A hydrody

namic model with an inhomogeneous baryonic profile qualitatively captures the

observed system size dependence, offering insights into baryon deposition and

the transport properties of the QCD medium. Additionally, in mid-central and

peripheral collisions, these data can provide insights into the strength of elec

tromagnetic fields and the conductivities of the medium [2].

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MicrosoftInternetExplorer4

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Measurement of system size dependence of directed flow of protons (anti-protons) at RHIC