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S) (n = 1, two, 3) transitions with partial widths of 300 - 400 keV [1116]. Recently Belle S) (n = 1, two, three) transitions with partial widths of 300 - 400 keV [1116]. Recently Belle reported preliminary outcomes around the observation of (5S) (1S, 2S) and (5S) + - (1D) with anomalously significant prices [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 have a similar origin [1125]. The mechanism can be regarded as either as a rescatter??ing on the D D or B B mesons, or as a contribution of the molecular component towards the quarkonium wave function. ?The model in which Y (4260) is really a D1 (2420) D molecule naturally explains the high probability of the intermediate molecular resonance within the Y (4260) + - J/ transitions [1126,1127] and predicts the Y (4260) X (3872) transitions with high prices [1128]. Such transitions have not too long ago 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)Regardless of striking similarities in between the observations in the charmonium and bottomonium sectors, you'll find also clear variations. In the charmonium sector, every of the Y (3915), (4040), (4160), Y (4260), Y (4360) and Y (4660) decays to only one certain final state with charmonium [ J/, J/, + - J/ or + - (2S)]. Inside the bottomonium sector, there is certainly a single state with anomalous properties, the (5S), and it decays to distinctive channels with comparable prices [ + - (nS), + - h b (m P), + - (1D), (nS)]. There is no common model describing these peculiarities. To explain the affinity from the charmonium-like states to some particular channels, the notion of "hadrocharmonium" was proposed in [1084]. It really is a heavy quarkonium embedded into a cloud of light hadron(s), therefore the fallapart decay is dominant. Hadrocharmonium could also deliver 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 1 to 4 more than the final 2 years, including a far more precise measurement of your b (1S) mass, 11 MeV away in the PDG2012 typical. There is evidence for one of the two nonetheless missing narrow charmonium states anticipated ??within the area amongst the D D and D D thresholds. Observations and detailed studies from the charged bottomoniumlike states Z b (10610) and Z b (10650) and initial benefits on the charged charmonium-like states Z c open a rich phenomenological field to study exotic states near open flavor thresholds. There's also considerable progress as well as a extra clear experimental scenario for the highly excited heavy quarkonium states above open flavor thresholds. Current highlights incorporate confirmation in the Y (4140) state by CMS and D0, observation of your decays (4040, 4160) J/ by Belle, measurement on the energy dependence with the e+ e- + - h c cross section by BES III, observation of your Y (4260) X (3872) by BES III and determination on the Z (4430) spin arity from complete amplitude analysis by Belle.

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