Tetraquarks from Intrinsic Heavy Quarks

TL;DR

This paper investigates the production of newly observed tetraquark states containing charm quarks via intrinsic charm in the proton, showing that mass predictions align with experimental data and exploring their kinematic distributions and cross sections.

Contribution

It introduces a model for tetraquark production from intrinsic charm, providing mass calculations and kinematic predictions that match recent experimental observations.

Findings

Tetraquark masses agree with experimental measurements.

Kinematic distributions vary with rapidity and transverse momentum.

Estimated cross sections for tetraquark production are discussed.

Abstract

A number of new four-quark states containing from one to four charm or anti-charm quarks have been observed recently. Many of these new states have been discovered at the LHC. The production of these states via intrinsic charm in the proton is investigated. The tetraquark masses obtained in this approach, while dependent on the internal transverse momenta of the partons in the state, are shown to agree well with the measured masses. These calculations can provide some insight into the nature of the tetraquark candidates, whether as a bound meson pair or as a looser configuration of four individual partons. The kinematic distributions of these states as a function of rapidity and transverse momentum are also studied. The possible cross sections for these states are finally considered.