EPJ Web of Conferences 271, 10001 (2022)
https://doi.org/10.1051/epjconf/202227110001

The T⁺_cc exotic state and its doubly bottom B^(*)_(s)B^(*)_(s) counterparts

¹ Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigación de Paterna, Aptdo. 22085, 46071 Valencia, Spain
² Department of Physics, Guangxi Normal University, Guilin 541004, China
³ Guangxi Key Laboratory of Nuclear Physics and Technology, Guangxi Normal University, Guilin 541004, China
⁴ School of Science, Huzhou University, Huzhou 313000, Zhejiang, China
⁵ Departamento de Física, Universidad de Murcia, E-30100 Murcia, Spain
⁶ Universidade de Sao Paulo, Instituto de Fisica, C.P. 05389-970 Sao Paulo, Brazil
⁷ Universidade Federal de Sao Paulo, C.P. 01302-907 Sao Paulo, Brazil
⁸ Nuclear Physics Institute, 25068 Rez, Czech Republic

^* e-mail: Eulogio.Oset@ific.uv.es
^** e-mail: liangwh@gxnu.edu.cn
^*** e-mail: dailianrong@zjhu.edu.cn
^**** e-mail: Raquel.Molina@ific.uv.es
^† e-mail: luisroca@um.es
^‡ e-mail: amartine@if.usp.br
^§ e-mail: kanchan.khemchandani@unifesp.br
^¶ e-mail: edfeijoo@ific.uv.es

Published online: 9 November 2022

Abstract

We have studied the exotic doubly charmed D^*D system providing a natural explanation for the peak recently observed by LHCb, in terms of D^*+D⁰ and D^*0D⁺ with isospin I = 0. The width has been evaluated accurately based on the decay widths of the D^* states. The D⁰D⁰π⁺ decay mode of the bound state formed is studied in detail, showing a narrow peak below the D^*+D⁰ threshold and some strength above it, as observed in the experiment. The remarkable agreement of this approach and the latter experimental analysis supports strongly the molecular nature of this state, the first example of a meson with two open charmed quarks. This study can be naturally extended to the bottom sector giving interesting features for the B^(*)_(s)B^(*)_(s) counterparts found there. In addition, our previous study on the D^*D^* molecular state has been revisited taking into account the insights extracted from the T_cc state and the new results are included in the present manuscript.