X (3872) production from reactions involving D and D* mesons

37th Brazilian Meeting on Nuclear Physics

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

Instituto de Física, Universidade de São Paulo, C.P. 66318, São Paulo, SP

05389-970, Brazil^1

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

40210-340, Brazil^2

关键词: Charged components;    Heavy ion collision;    Production cross section;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/630/1/012037/pdf
DOI  :  10.1088/1742-6596/630/1/012037

来源: IOP

【 摘 要 】

In this proceeding we show the results found for the cross sections of the processes DD → πX(3872), D ∗D → πX(3872) and D ∗D∗ → πX(3872), information needed for calculations of the X(3872) abundance in heavy ion collisions. Our formalism is based on the generation of X(3872) from the interaction of the hadrons D 0D∗0 - c.c, D-D∗+ - c.c and D- s D∗+ s -c.c. The evaluation of the cross section associated with processes having D∗ meson(s) involves an anomalous vertex, X D ∗D∗, which we have determined by considering triangular loops motivated by the molecular nature of X(3872). We find that the contribution of this vertex is important. Encouraged by this finding we estimate the X D ∗D∗ coupling, which turns out to be 1:95 ± 0:22. We then use it to obtain the cross section for the reaction D ∗D∗ → πX and find that the X D ∗D∗ vertex is also relevant in this case. We also discuss the role of the charged components of X in the determination of the production cross sections.