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Recently Belle reported preliminary benefits on the observation of (5S) (1S, 2S) and (5S) + - (1D) with anomalously big prices [985]. It's proposed that these anomalies are as a result of rescatterings [1123,1124]. The large branching fraction of the (4S) (1S) decay observed in 2010 by BaBar could possess a equivalent origin [1125]. The mechanism can be regarded either as a rescatter??ing with the D D or B B mesons, or as a contribution of the molecular element to the quarkonium wave function. ?The model in which Y (4260) is often a D1 (2420) D molecule naturally explains the higher probability in 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)Despite striking similarities amongst the observations inside the charmonium and bottomonium sectors, you can find also clear variations. Inside the charmonium sector, each on the Y (3915), (4040), (4160), Y (4260), Y (4360) and Y (4660) decays to only a single unique final state with charmonium [ J/, J/, + - J/ or + - (2S)]. In the bottomonium sector, there is certainly 1 state with anomalous properties, the (5S), and it decays to unique channels with similar prices [ + - (nS), + - h b (m P), + - (1D), (nS)]. There is certainly no basic model describing these peculiarities. To clarify the affinity from the 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), therefore 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)+ . 4.3.5 Summary Quarkonium spectroscopy enjoys an intensive flood of new benefits. The number of spin-singlet bottomonium states has enhanced from 1 to four over the last two years, including a extra RG7227 price precise measurement on the b (1S) mass, 11 MeV away from the PDG2012 average. There is certainly evidence for among the two nonetheless missing narrow charmonium states anticipated ??in the region between 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 benefits on the charged charmonium-like states Z c open a rich phenomenological field to study exotic states near open flavor thresholds. There is also significant progress and also a much more clear experimental scenario 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 in the decays (4040, 4160) J/ by Belle, measurement of your power dependence with 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 basic function of extremely excited states is their big decay price to decrease quarkonia using the emission of light hadrons. Rescattering is significant for understanding their properties, having said that, there is no basic model explaining their decay patterns.

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