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The massive branching fraction from the (4S) (1S) decay observed in 2010 by BaBar could have a comparable origin [1125]. The mechanism could be deemed either as a rescatter??ing from the D D or B B mesons, or as a contribution of the molecular component for the quarkonium wave function. ?The model in which Y (4260) is a D1 (2420) D molecule naturally explains the high probability from the intermediate molecular resonance within the Y (4260) + - J/ transitions [1126,1127] and predicts the Y (4260) X (3872) transitions with high rates [1128]. Such transitions have not too long ago been observed by BES III, with [1107] K + - (2S)2981 Page 74 ofEur. Phys. J. C (2014) 74:[e+ e- X (3872)] 11 . [e+ e- + - J/](four.15)Regardless of striking similarities in between the observations in the charmonium and bottomonium sectors, you will discover also clear differences. Within the charmonium sector, each and every with the Y (3915), (4040), (4160), Y (4260), Y (4360) and Y (4660) decays to only one certain final state with charmonium [ J/, J/, + - J/ or + - (2S)]. In the bottomonium sector, there is certainly 1 state with anomalous properties, the (5S), and it decays to distinctive channels with related rates [ + - (nS), + - h b (m P), + - (1D), (nS)]. There is no common model describing these peculiarities. To explain the affinity from the charmonium-like states to some distinct channels, the notion of "hadrocharmonium" was proposed in [1084]. It's a heavy quarkonium embedded into a cloud of light hadron(s), therefore the fallapart decay is dominant. Hadrocharmonium could also offer an explanation for title= jir.2014.0001 the charged charmonium-like states Z (4430)+ , Z (4050)+ and Z (4250)+ . four.three.5 Summary Quarkonium spectroscopy enjoys an intensive flood of new outcomes. The amount of spin-singlet bottomonium states has enhanced from a single to 4 over the final two years, which includes a extra precise measurement in the b (1S) mass, 11 MeV away from the PDG2012 typical. There is certainly evidence for on the list of two nevertheless missing narrow charmonium states expected ??inside the area amongst the D D and D D GDC-0917 web thresholds. Observations and detailed research with the charged bottomoniumlike states Z b (10610) and Z b (10650) and 1st results on the charged charmonium-like states Z c open a wealthy phenomenological field to study exotic states near open flavor thresholds. There's also substantial progress plus a additional clear experimental predicament for the very excited heavy quarkonium states above open flavor thresholds. Recent highlights contain confirmation from the Y (4140) state by CMS and D0, observation of your decays (4040, 4160) J/ by Belle, measurement on the power dependence of the e+ e- + - h c cross section by BES III, observation on the Y (4260) X (3872) by BES III and determination on the Z (4430) spin arity from complete amplitude evaluation by Belle. A common function of extremely excited states is their big decay price to decrease quarkonia with the emission of light hadrons. Rescattering is vital for understanding their properties, however, there is certainly no general model explaining their decay patterns. The remaining experimental open queries or title= SART.S23503 controversies are within the attain with the LHC or may have to wait for the subsequent generation B-factory.

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