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S) (n = 1, two, 3) transitions with partial widths of 300 - 400 keV [1116]. Lately Belle reported preliminary benefits around the observation of (5S) (1S, 2S) and (5S) + - (1D) with anomalously massive prices [985]. It is actually proposed that these anomalies are as a result of rescatterings [1123,1124]. The substantial branching fraction in the (4S) (1S) decay observed in 2010 by BaBar could possess a similar origin [1125]. The mechanism is often regarded as either as a rescatter??ing in the D D or B B mesons, or as a contribution in the molecular element towards the quarkonium wave function. ?The model in which Y (4260) is often a D1 (2420) D molecule naturally explains the high probability with 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 Web page 74 ofEur. Phys. J. C (2014) 74:[e+ e- X (3872)] 11 . [e+ e- + - J/](four.15)In spite of striking similarities involving the observations within the charmonium and bottomonium sectors, you will find also clear variations. Inside the charmonium sector, each and every on the Y (3915), (4040), (4160), Y (4260), Y (4360) and Y (4660) decays to only one particular final state with charmonium [ J/, J/, + - J/ or + - (2S)]. Inside the bottomonium sector, there's 1 state with anomalous CPI-455 site properties, the (5S), and it decays to distinct channels with comparable prices [ + - (nS), + - h b (m P), + - (1D), (nS)]. There is no common model describing these peculiarities. To clarify the affinity of your charmonium-like states to some specific channels, the notion of "hadrocharmonium" was proposed in [1084]. It really is a heavy quarkonium embedded into a cloud of light hadron(s), hence the fallapart decay is dominant. Hadrocharmonium could also supply an explanation for title= jir.2014.0001 the charged charmonium-like states Z (4430)+ , Z (4050)+ and Z (4250)+ . four.3.five Summary Quarkonium spectroscopy enjoys an intensive flood of new outcomes. The amount of spin-singlet bottomonium states has enhanced from a single to four more than the final 2 years, which includes a extra precise measurement on 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 anticipated ??in the area in between the D D and D D thresholds. Observations and detailed research with the charged bottomoniumlike states Z b (10610) and Z b (10650) and very first final results on the charged charmonium-like states Z c open a wealthy phenomenological field to study exotic states close to open flavor thresholds. There is also important progress and a more clear experimental situation for the extremely excited heavy quarkonium states above open flavor thresholds. Current highlights incorporate confirmation of the Y (4140) state by CMS and D0, observation of the decays (4040, 4160) J/ by Belle, measurement from the power dependence in the e+ e- + - h c cross section by BES III, observation of your Y (4260) X (3872) by BES III and determination from the Z (4430) spin arity from complete amplitude evaluation by Belle. A general feature of extremely excited states is their significant decay price to decrease quarkonia together with the emission of light hadrons.

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