Obtaining the strong coupling constants g_{J/\psi D_s D_s} and g_{\phi
  D_s D_s} from QCD Sum Rules

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Abstract

The form factors and coupling constants of the meson vertices J/\psi D_s D_s and \phi D_s D_s were calculated using three point correlation functions within the QCD Sum Rules formalism. We have considered the cases where \phi, D_s and J/\psi mesons are off-shell obtaining, for each vertex, two different form factors and its corresponding coupling constants, namely g_{J/\psi D_s D_s} = 6.20^{+0.97}_{-1.15} and g_{\phi D_s D_s} = 1.85^{+0.22}_{-0.23}.

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Hadronic molecule structure of the Y(3940) and Y(4140)

Tanja Branz, Valery E. Lyubovitskij, Thomas Gutsche (2009)

We report on further evidence that the Y(3940) and the recently observed Y(4140) are heavy hadron molecule states with quantum numbers J(PC) = 0(++). The Y(3940) state is considered to be a superposition of D*(+)D*(-) and D*(0) barD*(0), while the Y(4140) is a bound state of Ds*(+) and Ds*(-) mesons. For the first time we give predictions for the strong Y(3940) to Jpsi omega, Y(4140) to Jpsi phi and radiative Y(3940)/Y(4140) to gamma gamma decay widths in a phenomenological Lagrangian approach. Results for the strong Jpsi V (V = omega, phi) decays clearly support the molecular interpretation of the Y(3940) and Y(4140).

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Y(4143) is probably a molecular partner of Y(3930)

Shi-Lin Zhu, Xiang Liu (2009)

After discussing the various possible interpretations of the Y(4143) signal observed by the CDF collaboration in the

$J/\psi \phi$ mode, we tend to conclude that Y(4143) is probably a

$D_s^\ast {\bar D}_s^\ast$ molecular state with

$J^{PC}=0^{++}$ or

$2^{++}$ while Y(3930) is its

$D^\ast {\bar D}^\ast$ molecular partner as predicted in our previous work (arXiv:0808.0073). Both the hidden-charm and open charm two-body decays occur through the rescattering of the vector components within the molecular states while the three- and four-body open charm decay modes are forbidden kinematically. Hence their widths are narrow naturally. CDF, Babar and Belle collaborations may have discovered heavy molecular states already. We urge experimentalists to measure their quantum numbers and explore their radiative decay modes in the future.

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Study on contributions of hadronic loops to decays of $J/\psi\to$ vector $+$ pseudoscalar mesons

Xue-Qian Li, Xiao-Qiang Zeng, Xiang Liu (2006)

In this work, we evaluate the contributions of the hadronic loops to the amplitudes of

$J/\psi\to PV$ where

$P$ and

$V$ denote light pseudoscalar and vector mesons respectively. By fitting data of two well measured channels of

$J/\psi\to PV$ , we obtain the contribution from the pure OZI process to the amplitude which is expressed by a phenomenological quantity

$|\mathcal{G}^{PV}_{S}|$ , and a parameter

$\alpha$ existing in the calculations of the contribution of hadronic loops. In terms of

$\alpha$ and

$|\mathcal{G}^{PV}_{S}|$ , we calculate the branching ratios of other channels and get results which are reasonably consistent with data. Our results show that the contributions from the hadronic loops are of the same order of magnitude as that from the OZI processes and the interference between the two contributions are destructive. The picture can be applied to study other channels such as PP or VV of decays of

$J/\psi$ .

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Publication date Created: 01 October 2012

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ArXiV ID: 1210.0471

SO-VID: cb42bf1d-90cd-4c6f-857b-ea5417049d1d

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Comments 14 pages, 7 figures

Categories hep-ph

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Obtaining the strong coupling constants g_{J/\psi D_s D_s} and g_{\phi D_s D_s} from QCD Sum Rules

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Most cited references 5

Hadronic molecule structure of the Y(3940) and Y(4140)

Y(4143) is probably a molecular partner of Y(3930)

Study on contributions of hadronic loops to decays of $J/\psi\to$ vector $+$ pseudoscalar mesons

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Obtaining the strong coupling constants g_{J/\psi D_s D_s} and g_{\phi D_s D_s} from QCD Sum Rules

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EDP Sciences super collection

Hadronic molecule structure of the Y(3940) and Y(4140)

Y(4143) is probably a molecular partner of Y(3930)

Study on contributions of hadronic loops to decays of J/ψ→J/\psi\to vector ++ pseudoscalar mesons

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Study on contributions of hadronic loops to decays of $J/\psi\to$ vector $+$ pseudoscalar mesons