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arXiv · 1811.03849

Weak Decays of Doubly-Heavy Tetraquarks ${b\bar c}{q\bar q}$

Gang Li·Xiao-Feng Wang·Ye Xing
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Abstract

We study the weak decays of exotic tetraquark states ${b\bar c}{q\bar q}$ with two heavy quarks. Under the SU(3) symmetry for light quarks, these tetraquarks can be classified into an octet plus a singlet: $3\bigotimes\bar 3=1\bigoplus8$. We will concentrate on the octet tetraquarks with $J^{P}=0^{+}$, and study their weak decays, both semileptonic and nonleptonic. Hadron-level effective Hamiltonian is constructed according to the irreducible representations of the SU(3) group. Expanding the Hamiltonian, we obtain the decay amplitudes parameterized in terms of a few irreducible quantities. Based on these amplitudes, relations for decay widths are derived, which can be tested in future. We also give a list of golden channels that can be used to look for these states at various colliders.

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Gang Li, Xiao-Feng Wang, Ye Xing. 2018-11-09. Weak Decays of Doubly-Heavy Tetraquarks ${b\bar c}{q\bar q}$. https://doi.org/10.1140/epjc%2Fs10052-019-6729-0

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