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The huge branching fraction on the (4S) (1S) decay observed in 2010 by BaBar could have a similar origin [1125]. The mechanism is usually thought of either as a rescatter??ing on the D D or B B mesons, or as a contribution with the molecular element towards the quarkonium wave function. ?The model in which Y (4260) is usually a D1 (2420) D molecule naturally explains the high probability of your intermediate molecular resonance in the Y (4260) + - J/ transitions [1126,1127] and predicts the Y (4260) X (3872) transitions with high 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/](4.15)Regardless of striking similarities involving the observations within the charmonium and bottomonium sectors, you will discover also clear variations. Inside the charmonium sector, every single from the Y (3915), (4040), (4160), Y (4260), Y (4360) and Y (4660) decays to only 1 distinct final state with charmonium [ J/, J/, + - J/ or + - (2S)]. Inside the bottomonium sector, there is certainly 1 state with anomalous properties, the (5S), and it decays to different channels with equivalent prices [ + - (nS), + - h b (m P), + - (1D), (nS)]. There's no common model describing these peculiarities. To explain the affinity from the charmonium-like states to some unique channels, the notion of "hadrocharmonium" was proposed in [1084]. It truly is a heavy quarkonium embedded into a cloud of light hadron(s), therefore 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)+ . 4.three.5 Summary Quarkonium spectroscopy enjoys an intensive flood of new results. The number of spin-singlet bottomonium states has enhanced from 1 to four over the last two years, such as a extra precise measurement in the b (1S) mass, 11 MeV away from the PDG2012 typical. There's evidence for among the list of two nonetheless missing narrow charmonium states expected ??inside the area among the D D and D D thresholds. Observations and detailed research from the charged bottomoniumlike states Z b (10610) and Z b (10650) and first final results on the charged charmonium-like states Z c open a rich phenomenological field to study exotic states close to open flavor thresholds. There is also substantial progress along with a much more clear experimental predicament for the very excited heavy quarkonium states above open flavor thresholds. Current highlights contain confirmation with the Y (4140) state by CMS and D0, observation with the decays (4040, 4160) J/ by Belle, measurement of the power dependence of the e+ e- + - h c cross section by BES III, observation of the Y (4260) X (3872) by BES III and determination of the Z (4430) spin arity from full amplitude analysis by Belle. A common feature of highly excited states is their big decay rate to reduce Daclatasvir (dihydrochloride) quarkonia together with the emission of light hadrons. Rescattering is essential for understanding their properties, even so, there is certainly no common model explaining their decay patterns. The remaining experimental open questions or title= SART.S23503 controversies are within the attain with the LHC or may have to wait for the subsequent generation B-factory. Fr.

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