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Masses of tetraquarks with two heavy quarks in the relativistic quark model

D. Ebert

R. N. Faustov and V. O. Galkin

W. Lucha

Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, D-12489 Berlin, Germany

Institut für Physik, Humboldt-Universität zu Berlin, Newtonstrasse 15, D-12489 Berlin, Germany and Dorodnicyn Computing Centre, Russian Academy of Sciences, Vavilov Street 40, 119991 Moscow, Russia

Institute for High Energy Physics, Austrian Academy of Sciences, Nikolsdorfergasse 18, A-1050, Vienna, Austria

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Phys. Rev. D 76, 114015 – Published 20 December, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.114015

Abstract

Masses of tetraquarks with two heavy quarks and open charm and bottom are calculated in the framework of the diquark-antidiquark picture in the relativistic quark model. All model parameters were regarded as fixed by previous considerations of various properties of mesons and baryons. The light quarks and diquarks are treated completely relativistically. The $c$ quark is assumed to be heavy enough to make the diquark configurations dominating. The diquarks are considered not to be pointlike but to have an internal structure which is taken into account by the calculated diquark form factor entering the diquark-gluon interaction. It is found that all the $(c c) (\bar{q} {\bar{q}}^{'})$ tetraquarks have masses above the thresholds for decays into open charm mesons. Only the $I (J^{P}) = 0 (1^{+})$ state of $(b b) (\bar{u} \bar{d})$ lies below the $B B^{*}$ threshold and is predicted to be narrow.

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Masses of tetraquarks with two heavy quarks in the relativistic quark model

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