$\Lambda\bar{\Lambda}$ 对产生中的自旋-自旋关联:NICA 上的 SPD 实验
Spin-spin correlations in $Λ\barΛ$ pair production at the SPD experiment at NICA
AI总结:
针对NICA的SPD实验,在pp和dd碰撞中评估ΛΛ̄对自旋关联的可行性,基于SU(6)和Burkardt-Jaffe模型估算关联,分析运动学并模拟探测器适用性,以研究s̄s产生机制和初始态极化作用。
AI中文摘要:
STAR 合作组最近的测量表明,$\Lambda\bar{\Lambda}$ 对的自旋关联对 $s\bar{s}$ 对的自旋结构以及该过程中自旋转移具有敏感性。这些结果连同 CMS 在更高能量下的最新测量,为研究从部分子到强子转变过程中的自旋动力学开辟了新途径。本文针对 NICA 上的 SPD 实验,在 $\sqrt{s_{NN}}\leq27$~GeV 的 $pp$ 和 $dd$ 碰撞中,开展了 $\Lambda\bar{\Lambda}$ 对自旋-自旋关联的可行性研究。在 SU(6) 和 Burkardt--Jaffe 模型框架下,对自旋三重态 $s\bar{s}$ 对预期的关联 $P_{\Lambda\bar{\Lambda}}$ 进行了估算。分析了该过程的运动学特性,并通过全模拟评估了探测器对此类测量的适用性。SPD 实验为研究非微扰和微扰 $s\bar{s}$ 产生机制的相对贡献提供了机会,并且利用极化束流,还可研究初始态极化在自旋依赖的部分子动力学中的作用。
英文摘要:
Recent measurements by the STAR collaboration have demonstrated that spin correlations of $Λ\barΛ$ pairs provide sensitivity to the spin structure of $s\bar{s}$ pairs and to spin transfer during hadronization.These results, together with recent CMS measurements at higher energies, open a new avenue for studying spin dynamics in the transition from partons to hadrons. A feasibility study of spin-spin correlations in $Λ\barΛ$ pairs at the SPD experiment at NICA is presented for $pp$ and $dd$ collisions at $\sqrt{s_{NN}}\leq27$~GeV. The expected correlation $P_{Λ\barΛ}$ is estimated within the SU(6) and Burkardt--Jaffe models for a spin-triplet $s\bar{s}$ pair. The kinematic properties of the process are analysed, and the suitability of the detector for such measurements is evaluated using a full simulation. The SPD experiment provides an opportunity to investigate the relative contributions of non-perturbative and perturbative $s\bar{s}$-production mechanisms and, with polarized beams, to study the role of initial-state polarization in spin-dependent partonic dynamics.