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It really is proposed that these anomalies are on account of rescatterings [1123,1124]. The massive branching fraction with the (4S) (1S) decay observed in 2010 by BaBar could have a similar origin [1125]. The mechanism is often viewed as either as a rescatter??ing in the D D or B B mesons, or as a contribution in the molecular element for the quarkonium wave function. ?The model in which Y (4260) is often a D1 (2420) D molecule naturally explains the high probability from the intermediate molecular resonance in the Y (4260) + - J/ transitions [1126,1127] and predicts the Y (4260) X (3872) transitions with high rates [1128]. Such transitions have recently 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/](4.15)In spite of striking similarities in between the observations in the charmonium and bottomonium sectors, you'll find also clear differences. Within the charmonium sector, each with the Y (3915), (4040), (4160), Y (4260), Y (4360) and Y (4660) decays to only one unique final state with charmonium [ J/, J/, + - J/ or + - (2S)]. Inside the bottomonium sector, there's one state with anomalous properties, the (5S), and it decays to diverse channels with comparable rates [ + - (nS), + - h b (m P), + - (1D), (nS)]. There's no basic model describing these peculiarities. To explain the affinity in the charmonium-like states to some particular channels, the notion of "hadrocharmonium" was proposed in [1084]. It is a heavy quarkonium embedded into a cloud of light hadron(s), hence the fallapart decay is dominant. Hadrocharmonium could also present an explanation for title= jir.2014.0001 the charged charmonium-like states Z (4430)+ , Z (4050)+ and Z (4250)+ . 4.three.five Summary Quarkonium spectroscopy enjoys an intensive flood of new final results. The number of spin-singlet bottomonium states has elevated from a single to four over the last two years, which includes a extra precise measurement on the b (1S) mass, 11 MeV away in the PDG2012 typical. There is certainly evidence for one of many two nonetheless missing narrow charmonium states anticipated ??inside the region among the D D and D D thresholds. Observations and detailed studies with the charged bottomoniumlike states Z b (10610) and Z b (10650) and first final results around the charged charmonium-like states Z c open a rich phenomenological field to study exotic states near open flavor thresholds. There is also considerable progress plus a far more clear experimental circumstance for the very excited heavy quarkonium states above open flavor thresholds. Recent highlights consist of confirmation in the Y (4140) state by CMS and D0, observation of the decays (4040, 4160) J/ by Belle, measurement on the energy dependence on the e+ e- + - h c cross section by BES III, observation on the Y (4260) X (3872) by BES III and determination with the Z (4430) spin arity from complete amplitude evaluation by Belle. A common feature of hugely excited states is their substantial decay price to decrease quarkonia with all the emission of light hadrons. Rescattering is very important for understanding their properties, on the other hand, there is no basic model explaining their decay patterns.

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