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Classical excluded volume of loosely bound light (anti) nuclei and their chemical freeze-out in heavy ion collisions
International Journal of Modern Physics E ( IF 1.1 ) Pub Date : 2020-12-23 , DOI: 10.1142/s0218301320400091
Boris E. Grinyuk 1 , Kyrill A. Bugaev 1, 2 , Violetta V. Sagun 1, 3 , Oleksii I. Ivanytskyi 1, 3 , Dmitry L. Borisyuk 1 , Anatoly S. Zhokhin 1 , Gennady M. Zinovjev 1 , David B. Blaschke 4, 5, 6 , Larissa V. Bravina 7 , Evgeny E. Zabrodin 7, 8 , Edward G. Nikonov 9 , Glennys Farrar 10 , Sonia Kabana 11 , Sergey V. Kuleshov 12 , Arkadiy V. Taranenko 6
Affiliation  

From the analysis of light (anti)nuclei multiplicities that were measured recently by the ALICE collaboration in Pb+Pb collisions at the center-of-mass collision energy [Formula: see text][Formula: see text]TeV, there arose a highly nontrivial question about the excluded volume of composite particles. Surprisingly, the hadron resonance gas model (HRGM) is able to perfectly describe the light (anti) nuclei multiplicities under various assumptions. Thus, one can consider the (anti)nuclei with a vanishing hard-core radius (as the point-like particles) or with the hard-core radius of proton, but the fit quality is the same for these assumptions. It is clear, however, that such assumptions are unphysical. Hence we obtain a formula for the classical excluded volume of loosely bound light nuclei consisting of A baryons. To implement a new formula into the HRGM, we have to modify the induced surface tension concept to treat the hadrons and (anti)nuclei on the same footing. We perform a thorough analysis of hadronic and (anti)nuclei multiplicities measured by the ALICE collaboration. The HRGM with the induced surface tension allows us to verify different assumptions on the values of hard-core radii and different scenarios of chemical freeze-out of (anti)nuclei. It is shown that the unprecedentedly high quality of fit [Formula: see text] is achieved, if the chemical freeze-out temperature of hadrons is about [Formula: see text][Formula: see text]MeV, while the one for all (anti)nuclei is [Formula: see text][Formula: see text]MeV.

中文翻译:

松散结合的轻(反)核的经典排除体积及其在重离子碰撞中的化学冻结

从最近 ALICE 合作在质心碰撞能量的 Pb+Pb 碰撞中测量的轻(反)核多重性分析 [公式:见正文][公式:见正文]TeV,出现了高度关于复合粒子排除体积的重要问题。令人惊讶的是,强子共振气体模型(HRGM)能够在各种假设下完美地描述轻(反)核的多重性。因此,可以考虑具有消失的硬核半径(作为点状粒子)或具有质子的硬核半径的(反)核,但这些假设的拟合质量相同。然而,很明显,这样的假设是非物理的。因此,我们获得了由 A 重子组成的松散结合轻核的经典排除体积的公式。为了在 HRGM 中实施一个新公式,我们必须修改诱导表面张力概念,以同等对待强子和(反)核。我们对 ALICE 合作测量的强子和(反)核多重性进行了彻底的分析。具有诱导表面张力的 HRGM 使我们能够验证对硬核半径值的不同假设以及(反)核化学冻结的不同情况。结果表明,如果强子的化学冻结温度约为 [公式:见文本][公式:见文本]MeV,则可以实现前所未有的高拟合质量 [公式:见文本],而万能的 (反)核是[公式:见正文][公式:见正文]MeV。我们对 ALICE 合作测量的强子和(反)核多重性进行了彻底的分析。具有诱导表面张力的 HRGM 使我们能够验证对硬核半径值的不同假设以及(反)核化学冻结的不同情况。结果表明,如果强子的化学冻结温度约为 [公式:见文本][公式:见文本]MeV,则可以实现前所未有的高拟合质量 [公式:见文本],而万能的 (反)核是[公式:见正文][公式:见正文]MeV。我们对 ALICE 合作测量的强子和(反)核多重性进行了彻底的分析。具有诱导表面张力的 HRGM 使我们能够验证对硬核半径值的不同假设以及(反)核化学冻结的不同情况。结果表明,如果强子的化学冻结温度约为 [公式:见文本][公式:见文本]MeV,则可以实现前所未有的高拟合质量 [公式:见文本],而万能的 (反)核是[公式:见正文][公式:见正文]MeV。
更新日期:2020-12-23
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