Classical excluded volume of loosely bound light (anti) nuclei and their chemical freeze-out in heavy ion collisions

Grinyuk, B.E.; Bugaev, K.A.; Sagun, V.V.; Ivanytskyi, O.I.; Borisyuk, D.L.; Zhokhin, A.S.; Zinovjev, G.M.; Blaschke, D.B.; Bravina, L.V.; Zabrodin, E.E.; Nikonov, E.G.; Farrar, G.; Kabana, S.; Kuleshov, S.V.; Taranenko, A.V.

Авторы: Grinyuk Boris E., Bugaev Kyrill A., Sagun Violetta V., Ivanytskyi Oleksii I., Borisyuk Dmitry L., Zhokhin Anatoly S., Zinovjev Gennady M., Blaschke David B., Bravina Larissa V., Zabrodin Evgeny E., Nikonov Edward G., Farrar Glennys, Kabana Sonia, Kuleshov Sergey V., Taranenko Arkadiy V.
Журнал: International Journal of Modern Physics E
Год издания: 2020
Издательство: World Scientific Publishing Co
Местоположение издательства: Singapore
Первая страница: 2040009
Номер статьи: 2040009
DOI: 10.1142/s0218301320400091
Аннотация: 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 √s_NN=2.76 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 𝜒2_tot/dof≃0.724 is achieved, if the chemical freeze-out temperature of hadrons is about 𝑇_ℎ=150 MeV, while the one for all (anti)nuclei is 𝑇_𝐴=174−175.2 MeV.
Добавил в систему: Забродин Евгений Евгеньевич

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Classical excluded volume of loosely bound light (anti) nuclei and their chemical freeze-out in heavy ion collisionsстатья Исследовательская статья