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S) (n = 1, two, three) transitions with partial widths of 300 - 400 keV [1116]. Lately Belle S) (n = 1, 2, 3) transitions with partial widths of 300 - 400 keV [1116]. Lately Belle reported preliminary final results around the observation of (5S) (1S, 2S) and (5S) + - (1D) with anomalously huge rates [985]. It's proposed that these anomalies are because of rescatterings [1123,1124]. The big branching fraction from the (4S) (1S) decay observed in 2010 by BaBar could possess a related origin [1125]. The mechanism can be regarded either as a rescatter??ing of your D D or B B mesons, or as a contribution of your molecular component to the quarkonium wave function. ?The model in which Y (4260) is really 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 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/](four.15)Despite striking similarities between the observations within the charmonium and bottomonium sectors, you'll find also clear differences. In the charmonium sector, every single with the Y (3915), (4040), (4160), Y (4260), Y (4360) and Y (4660) decays to only 1 certain final state with charmonium [ J/, J/, + - J/ or + - (2S)]. Inside the bottomonium sector, there is a single state with anomalous properties, the (5S), and it decays to various channels with equivalent rates [ + - (nS), + - h b (m P), + - (1D), (nS)]. There's no general model describing these peculiarities. To explain the affinity from the charmonium-like states to some certain channels, the notion of "hadrocharmonium" was proposed in [1084]. It's a heavy quarkonium embedded into a cloud of light hadron(s), hence 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.five Summary Quarkonium spectroscopy enjoys an intensive flood of new benefits. The number of spin-singlet bottomonium states has elevated from a single to 4 more than the last 2 years, which includes a additional precise measurement in the b (1S) mass, 11 MeV away from the PDG2012 typical. There is certainly proof for one of many two still missing narrow charmonium states expected ??in the region between the D D and D D thresholds. Observations and detailed studies in the charged bottomoniumlike states Z b (10610) and Z b (10650) and 1st results on the charged charmonium-like states Z c open a rich phenomenological field to study exotic states near open flavor thresholds. There's also significant progress and also a much more clear experimental predicament for the hugely excited heavy quarkonium states above open flavor thresholds. Recent highlights consist of confirmation on the Y (4140) state by CMS and D0, observation in the decays (4040, 4160) J/ by Belle, measurement from the power dependence with the e+ e- + - h c cross section by BES III, observation in the Y (4260) X (3872) by BES III and determination in the Z (4430) spin arity from full amplitude analysis by Belle.

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