Weak decays of the double-beauty tetraquark

Department of Physics, Doǧuş University, Dudullu-Ümraniye, 34775 Istanbul, Turkey

^* e-mail: bbarsbay@dogus.edu.tr

Published online: 17 November 2022

Abstract

The spectroscopic parameters and decay channels of the axial-vector tetraquark ₂¹³ built of heavy diquark bb and light antidiquark us are explored using QCD sum rule method. Because this state is stable against strong and electromagnetic decays, we consider its semileptonic and nonleptonic decay modes. Partial widths of weak processes T^AV_b:s¯ → Z⁰_b:s¯ lv¯_l and T_b:s¯^AV → Z⁰_b:s¯ M are calculated using weak form factors G_i(q²) computed by QCD three-point sum rules: Z⁰_b:s¯ is the scalar tetraquark with quark content bcus¯ and M is a vector meson. The full width and mean lifetime of the tetraquark T^AV_b:s¯ obtained in this work shed light on features of double-beauty tetraquarks and are useful for their experimental investigations.