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S) (n = 1, 2, 3) transitions with partial widths of 300 - 400 keV [1116]. Recently Belle reported preliminary results around the observation of (5S) (1S, 2S) and (5S) + - (1D) with anomalously substantial prices [985]. It truly is proposed that these anomalies are due to rescatterings [1123,1124]. The substantial branching fraction of the (4S) (1S) decay observed in 2010 by BaBar could have a similar origin [1125]. The mechanism can be regarded either as a rescatter??ing of the D D or B B mesons, or as a contribution with the molecular component to 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 in the Y (4260) + - J/ transitions [1126,1127] and predicts the Y (4260) X (3872) transitions with high 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/](four.15)In spite of striking similarities in between the observations within the charmonium and bottomonium sectors, there are actually also clear differences. Inside the charmonium sector, each of your Y (3915), (4040), (4160), Y (4260), Y (4360) and Y (4660) decays to only one particular certain final state with charmonium [ J/, J/, + - J/ or + - (2S)]. In the bottomonium sector, there is one state with anomalous properties, the (5S), and it decays to distinct channels with comparable prices [ + - (nS), + - h b (m P), + - (1D), (nS)]. There is no basic model describing these peculiarities. To clarify the affinity with the charmonium-like states to some unique channels, the notion of "hadrocharmonium" was proposed in [1084]. It is a heavy quarkonium embedded into a cloud of light hadron(s), therefore the fallapart decay is dominant. Hadrocharmonium could also present an purchase CTX-0294885 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 results. The amount of spin-singlet bottomonium states has enhanced from one to 4 over the final two years, such as a a lot more precise measurement in the b (1S) mass, 11 MeV away from the PDG2012 typical. There is evidence for among the two nevertheless missing narrow charmonium states expected ??in the region among the D D and D D thresholds. Observations and detailed research in the charged bottomoniumlike states Z b (10610) and Z b (10650) and initially 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 important progress along with a a lot more clear experimental circumstance for the hugely excited heavy quarkonium states above open flavor thresholds. Recent highlights incorporate confirmation from the Y (4140) state by CMS and D0, observation of the decays (4040, 4160) J/ by Belle, measurement on the power dependence of your e+ e- + - h c cross section by BES III, observation in the Y (4260) X (3872) by BES III and determination of the Z (4430) spin arity from full amplitude analysis by Belle. A general function of extremely excited states is their massive decay rate to reduced quarkonia with all the emission of light hadrons.

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