Year: 2017
Type: article
Abstract: The question of whether there exist bound states of two heavy quarks $Q=(c,b)$ and antiquarks $\overline{Q}=(\overline{c},\overline{b})$, distinct from a pair of quark-antiquark mesons, has been debated for more than forty years. We estimate masses of ${Q}_{1}{Q}_{2}{\overline{Q}}_{3}{\overline{Q}}_{4}$ resonant states ${X}_{{Q}_{1}{Q}_{2}{\overline{Q}}_{3}{\overline{Q}}_{4}}$ and suggest a means of producing and observing them. We concentrate on the $cc\overline{c}\overline{c}$ channel which is most easily produced and the $bb\overline{b}\overline{b}$ channel which has a better chance of being relatively narrow. We obtain $M({X}_{cc\overline{c}\overline{c}})=6,192\ifmmode\pm\else\textpm\fi{}25\text{ }\text{ }\mathrm{MeV}$ and $M({X}_{bb\overline{b}\overline{b}})=\phantom{\rule{0ex}{0ex}}18,826\ifmmode\pm\else\textpm\fi{}25\text{ }\text{ }\mathrm{MeV}$, for the ${J}^{PC}={0}^{++}$ states involving charmed and bottom tetraquarks, respectively. An experimental search for these states in the predicted mass range is highly desirable.
Institutions: Tel Aviv University, University of Chicago
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: U.S. Department of Energy
OpenAlex ID: W2588692844