Abstract Conventional, hadronic matter consists of baryons and mesons made three quarks a quark–antiquark pair, respectively 1,2 . Here, we report the observation state containing four in Large Hadron Collider beauty experiment. This so-called tetraquark contains two charm quarks, $$\overline{{{{{u}}}}}$$ u...

Tetraquark bound states in a constituent quark model and the nature of the a 0 (980) and f 0 (980) The pseudoscalar and vector meson ground states and their low-energy excited states have been understood as q ¯ q pairs. However, the structure of the scalar mesons, (J P C = 0 ++), remains controversial nowadays. In the naive quark model, to construct a positive parity state requires a unit of an...

We propose a string theory construction for the system of two heavy quarks and light antiquarks. The potential is function separation between quarks. define critical distance below which can be thought mainly as compact tetraquark. results show universality tension factorization at small separations expected from quark-diquark symmetry. Our estimate screening length in range lattice QCD. also m...

The masses of tetraquark states all $qc\overline{q}\overline{c}$ and $cc\overline{c}\overline{c}$ quark configurations are evaluated in a constituent model, where the Cornell-like potential one-gluon exchange spin-spin coupling employed. All model parameters predetermined by comparing theoretical experimental light, charmed bottom mesons. predictions charmoniumlike tetraquarks compared with obs...

The purpose of the present study is to explore mass spectrum hidden charm tetraquark states within a diquark model. Proposing that state composed and an antidiquark, masses all possible $[qc][\overline{q}\overline{c}]$, $[sc][\overline{s}\overline{c}]$, $[qc][\overline{s}\overline{c}]$ $([sc][\overline{q}\overline{c}])$ are systematically calculated by use effective Hamiltonian, which contains ...

The LHCb Collaboration discovered a double-charm tetraquark ${T}_{cc}^{+}$ with very small width. We investigate the as $D{D}^{*}$ molecule ${J}^{P}={1}^{+}$ in framework of one-boson-exchange potential model. isospin breaking effect and $S\ensuremath{-}D$ wave coupling are taken into account carefully. adopt complex scaling method to study system obtain quasibound state corresponding ${T}_{cc}...

Abstract Some hadrons have the exotic quantum numbers that traditional $$\bar{q} q$$ q ¯ mesons and qqq baryons can not reach, such as $$J^{PC} = 0^{--}/0^{+-}/1^{-+}/2^{+-}/3^{-+}/4^{+-}$$ J PC </mml...

Currently, flavour-cryptoexotic tetraquarks form the most common sort of all experimentally established exotic multiquark hadrons. This note points out a few promising concepts that should help improve theoretical (but, for several reasons, not quite straightforward) analyses such kind states: among others, their scope application encompasses strong interactions in limit (arbitrarily) large num...