What is the mechanism of the $T_{4c}(6900)$ tetraquark production?

Abstract

We discuss the production mechanism of fully charm tetraquark, observed recently by the LHCb at M = 6.9 GeV in the $J/\psi J/\psi$ channel. Both single parton scattering (SPS) and double parton scattering (DPS) mechanisms are considered. We calculate the distribution in the invariant mass of the four-quark system $M_{4c}$ for SPS and DPS production of $cc\bar{c}\bar{c}$ in the $k_t$-factorization approach. We present transverse momentum distribution in $p_{t,4c}$ for $c\bar{c}c\bar{c}$ system in a mass window around tetraquark mass. The calculation of the SPS $g^{\ast }{g}^{\ast }\to T_{4c}(6900)$ fusion mechanism is performed in the $k_T$-factorization approach assuming different spin scenarios ($0^{+}$ and $0^{-}$).

Comments: Submission to SciPost, XXVIII International Workshop on Deep-Inelastic Scattering and Related Subjects, 12-16 April 2021, presented by Antoni Szczurek