Zobrazeno 1 - 10
of 67
pro vyhledávání: '"Zanetti, C. M."'
Publikováno v:
Braz J Phys 52, 12 (2022)
In this work we study the meson vertex $D_sDK^*$ using the QCD sum rules. We compute the three point correlation functions for the three cases of different off-shell mesons. The form factors for each case are fitted to the numerical calculation of th
Externí odkaz:
http://arxiv.org/abs/2112.03146
We use the QCD sum rules for the three point correlation functions to compute the strong coupling constants of the meson vertices $\eta_c D^* D$ and $\eta_c D_s^* D_s$. We consider perturbative and non-perturbative contributions, working up to dimens
Externí odkaz:
http://arxiv.org/abs/1707.02330
Autor:
Nielsen, M., Albuquerque, R. M., Dias, J. M., Khemchandani, K. P., Torres, A. Martinez, Navarra, F. S., Zanetti, C. M.
Many new states in the charmonium mass region were recently discovered by BaBar, Belle, CLEO-c, CDF, D0, BESIII, LHCb and CMS Collaborations. We use the QCD Sum Rule approach to study the possible structure of some of these states.
Comment: Cont
Comment: Cont
Externí odkaz:
http://arxiv.org/abs/1611.03300
To understand the nature of the $X(5568)$, recently observed in the mass spectrum of the $B_{s}^0\pi^\pm$ system by the D0 Collaboration, we have investigated, in a previous work, a scalar tetraquark (diquak-antidiquark) structure for it, within the
Externí odkaz:
http://arxiv.org/abs/1603.02249
Publikováno v:
Phys. Rev. D 93, 096011 (2016)
Using the QCD sum rule approach we investigate the possible four-quark structure for the new observed $B_{s}^0\pi^\pm$ narrow structure (D0). We use a diquak-antidiquark scalar current and work to the order of $m_s$ in full QCD, without relying on $1
Externí odkaz:
http://arxiv.org/abs/1602.09041
We calculate the branching ratio for the production of the meson $Y(4260)$ in the decay $B^- \to Y(4260)K^-$. We use QCD sum rules approach and we consider the $Y(4260)$ to be a mixture between charmonium and exotic tetraquark, $[\bar{c}\bar{q}][qc]$
Externí odkaz:
http://arxiv.org/abs/1502.00119
Using the QCD sum rule approach we study the X(4260) state assuming that it can be described by a mixed charmonium-tetraquark current with $J^{PC}=1^{--}$ quantum numbers. For the mixing angle around $\theta=(53.0 \pm 0.5)^0$, we obtain a value for t
Externí odkaz:
http://arxiv.org/abs/1311.7467
Publikováno v:
Phys. Rev. D 89, 076007 (2014)
Using the QCD sum rules approach we study the mass and decay width of the channel $J/\psi + \omega$ for the $Y(3940)$ state. We assume that it can be described by a mixed charmonium-molecule scalar state, $(\chi_{c0})-(D^\ast D^\ast)$ current, with $
Externí odkaz:
http://arxiv.org/abs/1311.6411
We identify the recently observed charmonium-like structure $Z_c^\pm(3900)$ as the charged partner of the X(3872) state. Using standard techniques of QCD sum rules, we evaluate the three-point function and extract the coupling constants of the $Z_c \
Externí odkaz:
http://arxiv.org/abs/1304.6433
Publikováno v:
Phys.Rev. D86 (2012) 116012
Using the QCD sum rule approach we study the Y(4260) state assuming that it can be described by a mixed charmonium-tetraquark current with $J^{PC}=1^{--}$ quantum numbers. For the mixing angle around $\theta \approx (53.0\pm 0.5)^{0}$, we obtain a va
Externí odkaz:
http://arxiv.org/abs/1209.6592