Analysis of the vector and axialvector Bc mesons with QCD sum rules

Abstract

In this article, we study the vector and axialvector Bc mesons with the QCD sum rules, and make reasonable predictions for the masses and decay constants, then calculate the leptonic decay widths. The present predictions for the masses and decay constants can be confronted with the experimental data in the future. We can also take the masses and decay constants as basic input parameters and study other phenomenological quantities with the three-point vacuum correlation functions via the QCD sum rules.

Some heavy vector and tensor meson decay constants in light-front quark model

“…In the table, we also show the other related theoretical values in the literature [37][38][39][40][41][42][43][44][45][46]. From the table, we find that our numerical values with the power-law wave functions are slightly higher than those with the Gaussian ones.…”

Analysis of the $$QQ\bar{Q}\bar{Q}$$ Q Q Q ¯ Q ¯ tetraquark states with QCD sum rules

“…In Ref. [41], we study the vector and axial-vector B c mesons with the QCD sum rules and obtain the masses M B * c = 6.337 ± 0.052 GeV and M B c1 = 6.730 ± 0.061 GeV at the typical energy scale μ = 2 GeV. The B c mesons have two heavy quarks, and the mass M B * c = 6.337 ± 0.052 GeV lies slightly above the threshold 2M J/ψ = 6193.8 MeV, so we expect that the ideal energy scale to extract masses of the cccc tetraquark states from the QCD sum rules is about μ = 2 GeV.…”

Bc mesons and their properties on the light front

“…Constant (MeV) this work Lattice [3,4] QCD sum rules [22,23] LFQM [24] CCQM [25] BSE [27] for pseudoscalar (P ) and vector (V ) states, respectively. Here p is the momentum of the meson, and e µ λ is the polarization vector:…”

“…We present a survey of recent work in TABLE III along with results from Lattice [3,4] and other approaches (see Refs. [22][23][24][25][26][27]) for comparison. Lattice results are systematically smaller than the other methods by about 20%, as also discussed in other references (e.g.…”