Exotic $bc\overline{q}\overline{q}$ four-quark states

Caramés, T. F. (Departamento de Física Fundamental and IUFFyM, Universidad de Salamanca, 37008 Salamanca, Spain) ; Vijande, J. (Unidad Mixta de Investigación en Radiofísica e Instrumentación Nuclear en Medicina (IRIMED), Instituto de Investigación Sanitaria La Fe (IIS-La Fe)-Universitat de Valencia (UV) and IFIC (UV-CSIC), 46100 Valencia, Spain) ; Valcarce, A. (Departamento de Física Fundamental and IUFFyM, Universidad de Salamanca, 37008 Salamanca, Spain)

11 January 2019

Abstract: We carry out a systematic study of exotic $Q{Q}^{\prime }\overline{q}\overline{q}$ four-quark states containing distinguishable heavy flavors, $b$ and $c$. Different generic constituent models are explored in an attempt to extract general conclusions. The results are robust, predicting the same sets of quantum numbers as the best candidates to lodge bound states independently of the model used, the isoscalar ${J}^{P}={0}^{+}$ and ${J}^{P}={1}^{+}$ states. The first state would be strong and electromagnetic-interaction stable, while the second would decay electromagnetically to $\overline{B}D\gamma$. Isovector states are found to be unbound, preventing the existence of charged partners. The interest on exotic heavy-light tetraquarks with nonidentical heavy flavors comes reinforced by the recent estimation of the production rate of the isoscalar $bc\overline{u}\overline{d}$ ${J}^{P}={1}^{+}$ state, 2 orders of magnitude larger than that of the $bb\overline{u}\overline{d}$ analogous state.

Published in: Physical Review D 99 (2019)
Published by: APS
DOI: 10.1103/PhysRevD.99.014006
arXiv: 1812.08991
License: CC-BY-4.0

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