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Recently Belle reported preliminary benefits around the observation of (5S) (1S, 2S) and (5S) + - (1D) with anomalously huge prices [985]. It is actually proposed that these anomalies are due to rescatterings [1123,1124]. The significant branching fraction on the (4S) (1S) decay observed in 2010 by BaBar could possess a equivalent origin [1125]. The mechanism is often viewed as either as a rescatter??ing from the D D or B B mesons, or as a contribution in the molecular element to the quarkonium wave function. ?The model in which Y (4260) is actually a D1 (2420) D molecule naturally explains the high probability on the intermediate molecular resonance inside the Y (4260) + - J/ transitions [1126,1127] and predicts the Y (4260) X (3872) transitions with higher prices [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 among the observations within the charmonium and bottomonium sectors, there are also clear variations. Within the charmonium sector, every single of your Y (3915), (4040), (4160), Y (4260), Y (4360) and Y (4660) decays to only a single distinct final state with charmonium [ J/, J/, + - J/ or + - (2S)]. In the bottomonium sector, there is one particular state with anomalous properties, the (5S), and it decays to distinctive channels with similar prices [ + - (nS), + - h b (m P), + - (1D), (nS)]. There is no basic model describing these peculiarities. To explain the affinity on the charmonium-like states to some particular channels, the notion of "hadrocharmonium" was proposed in [1084]. It truly is a heavy quarkonium embedded into a cloud of light hadron(s), hence the fallapart decay is dominant. Hadrocharmonium could also give 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 benefits. The amount of spin-singlet bottomonium states has increased from one to four more than the final 2 years, including a much more precise measurement with the b (1S) mass, 11 MeV away in the PDG2012 average. There is proof for on the list of two still missing narrow charmonium states expected ??in the area amongst the D D and D D thresholds. Observations and detailed research with the charged bottomoniumlike states Z b (10610) and Z b (10650) and initially final results around the charged charmonium-like states Z c open a wealthy phenomenological field to study exotic states near open flavor thresholds. There's also considerable progress in addition to a additional clear experimental predicament for the very excited heavy quarkonium states above open flavor thresholds. Recent highlights include things like confirmation from the Y (4140) state by CMS and D0, observation from the decays (4040, 4160) J/ by Belle, measurement of your power dependence of the e+ e- + - h c cross section by BES III, observation of your Y (4260) X (3872) by BES III and determination with the Z (4430) spin arity from complete amplitude analysis by Belle. A basic function of very excited states is their massive decay rate to reduce quarkonia with all the emission of light hadrons.

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