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arXiv 2604.07005nucl-exnucl-th
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在RHIC上200 GeV Ru+Ru和Zr+Zr碰撞中测量包络J/ψ极化

Measurement of inclusive $J/ψ$ polarization in Ru+Ru and Zr+Zr collisions at $\sqrt{s_{\rm NN}}=200$ GeV at STAR

STAR Collaboration

AI总结:

本文报告了在200 GeV Ru+Ru和Zr+Zr碰撞中,利用STAR实验测量中性J/ψ极化,通过双电子衰变通道重建J/ψ介子,并在横向动量和碰撞中心性下测量极化参数,结果与质子-质子碰撞和输运模型一致。

摘要:

本文报告了在RHIC上200 GeV Ru+Ru和Zr+Zr碰撞中,利用STAR实验测量中性J/ψ极化。J/ψ介子通过双电子(e+e-)衰变通道重建。极化参数(lambda_theta, lambda_phi)作为J/ψ横向动量(p_T)和碰撞中心性的函数被测量,结果在两个框架中均在测得的J/ψ p_T范围内(0.2 < p_T < 10 GeV/c)和碰撞中心性(0-80%)内与零一致。这些结果与相应质子-质子碰撞测量和输运模型计算一致。

英文摘要:

The first measurement of inclusive J/psi polarization at mid-rapidity (|y^{J/psi}| < 0.8) in 200 GeV Ru+Ru and Zr+Zr collisions at sqrt(s_NN) = 200 GeV with the STAR experiment at RHIC is presented. J/psi mesons are reconstructed through their di-electron (e+e-) decay channel. The polarization parameters (lambda_theta, lambda_phi) are measured as a function of the J/psi transverse momentum (p_T) and collision centrality in both the helicity and the Collins-Soper frames. These polarization parameters are found to be consistent with zero across the measured J/psi p_T range of 0.2 < p_T < 10 GeV/c and across collision centralities within 0-80 percent in both frames. These results are consistent with corresponding measurements p+p collisions at the same collision energy and with transport-model calculations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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