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Register a new userRadiative decay of the dynamically generated open and hidden charm scalar meson resonances D_{s0}^*(2317) and X(3700)
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We present the formalism for the decay of dynamically generated scalar mesons with open- or hidden-charm and give results for the decay of D^*_{s0} (2317) to gamma D_s^* plus that of a hidden charm scalar meson state predicted by the theory around 3700 MeV decaying into gamma J/psi.
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In this presentation I explain our framework for dynamically generating resonances from the meson meson interaction. Our model generates many poles in the T-matrix which are associated with known states, while at the same time new states are predicted.
We briefly expose our model for generating open and hidden charm resonances and present the most interesting results.
We report improved measurements of the product branching fractions ${mathcal B}(B^+rightarrowbar{D}^0 D_{s0}^{*+} (2317))times{mathcal B}( D_{s0} ^{*+}(2317)rightarrow D_s^{+}pi^0) =(8.0^{+1.3}_{-1.2} pm 1.1 pm 0.4)times 10^{-4}$ and ${mathcal B}(B^0rightarrow D^- D_{s0} ^{*+}(2317))times{mathcal B}(D_{s0}^{*+}(2317)rightarrow D_s^{+}pi^0) =(10.2^{+1.3}_{-1.2} pm 1.0 pm 0.4)times 10^{-4}$, where the first errors are statistical, the second are systematic and the third are from $D$ and $D_s$ branching fractions. In addition, we report negative results from a search for hypothesized neutral ($Z^0$) and doubly charged ($Z^{++}$) isospin partners of the $D_{s0}^{*+}(2317)$ and provide upper limits on the product branching fractions ${mathcal B}(B^0 rightarrow D^0 z^0)times{mathcal B}(z^0rightarrow D_s^{+}pi^-)$ and ${mathcal B}(B^+rightarrow D^- z^{++})times{mathcal B}(z^{++}rightarrow D_s^{+}pi^+)$ that are more than an order of magnitude smaller than theoretical expectations for the hypotheses that the $D_{s0} ^{*+}(2317)$ is a member of an isospin triplet. The analysis uses a 711 fb$^{-1}$ data sample containing 772 million $Bbar{B}$ meson pairs collected at the $Upsilon(4S)$ resonance in the Belle detector at the KEKB collider.
The scalar meson $D_{s0}^*(2317)$ is found 37(17)MeV below DK threshold in a lattice simulation of the $J^P=0^+$ channel using, for the first time, both DK as well as $bar sc$ interpolating fields. The simulation is done on $N_f=2+1$ gauge configurations with $m_pisimeq 156 $MeV, and the resulting $M_{D_{s0}^*}-tfrac{1}{4}(M_{D_s}+3M_{D_s^*})=266(16)$ MeV is close to the experimental value 241.5(0.8)MeV. The energy level related to the scalar meson is accompanied by additional discrete levels due to DK scattering states. The levels near threshold lead to the negative DK scattering length $a_0=-1.33(20)$ fm that indicates the presence of a state below threshold.
We report on some ideas concerning the nature of the X(3872) resonance and the need for approximately equal charged and neutral components of $D bar{D}^* +cc$. Then we discuss how some hidden charm states are obtained from the interaction between vector mesons with charm and can be associated to some of the charmonium-like X,Y,Z states. Finally we discuss how the nature of these states could be investigated through different types of radiative decay.
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