Determining the structure of X (3872) in heavy ion collisions

32nd Winter Workshop on Nuclear Dynamics

Abreu, L.M.^1 ; Khemchandani, K.P.^2 ; Torres, A. Martínez^3 ; Navarra, F.S.^3 ; Nielsen, M.^3

Instituto de Física, Universidade Federal da Bahia, Salvador, BA

40210-340, Brazil^1

Faculdade de Tecnologia, Universidade Do Estado Do Rio de Janeiro, Rod. Presidente Dutra Km 298, Pólo Industrial, Resende, RJ

27537-000, Brazil^2

Instituto de Física, Universidade de São Paulo, Rua do Matão Travessa R, 187, São Paulo, SP

055508-090, Brazil^3

关键词: Anomalous couplings;    Dissociation cross sections;    Effective field;    Heavy ion collision;    Late stage;    New terms;    Rate equations;    Time evolutions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/736/1/012026/pdf
DOI  :  10.1088/1742-6596/736/1/012026

来源: IOP

【 摘 要 】

We study the time evolution of the X (3872) abundance in the hot hadron gas produced in the late stage of heavy ion collisions. We use effective field Lagrangians to obtain the production and dissociation cross sections of X(3872). In this evaluation we include diagrams involving the anomalous couplings πD∗D∗ and XD∗D∗ and also the couplings of the X(3872) with charged D and D∗ mesons. With these new terms the X(3872) interaction cross sections are much larger than those found in previous works. Using these cross sections as input in rate equations, we conclude that during the expansion and cooling of the hadronic gas, the number of X(3872), originally produced at the end of the mixed QGP/hadron gas phase, is reduced by a factor of 4.