0+ XTZ states from QCD spectral sum rules

Abstract

We review our results in [1] for the masses and couplings of Tccqq′ (JP=0+) states from (inverse) QCD Laplace sum rule (LSR), their ratios R and double ratio of sum rules (DRSR) within stability criteria and including Factorized Next-to-Leading Order (FNLO) Perturbative (PT) corrections and Lowest Order (LO) QCD condensates up to 〈G3〉. We show that combining R and DRSR can provide more precise results. Calibrated to the observed Xc(3872) and Tcc1+(3875), R combined with DRSR lead to a more precise prediction of MTcc0+=3883(3)MeV. In a similar way, calibrated to the new prediction of Tcc0+R⊕DRSR lead to the improved mass predictions: MTccs¯u¯0+=3927(6)MeV and MTccs¯s¯0+=3993(11)MeV. We extend our analysis to the bottom sector and compare our results with the ones from different LSR predictions and some other determinations (lattice, quark and potential models, …) in the literature.