Charmonium Decays ofY(4260),ψ(4160), andψ(4040)
نویسندگان
چکیده
منابع مشابه
Recent studies of Charmonium Decays at CLEO
Decays of a bound state of a quark and its antiquark, quarkonium, provide an excellent laboratory for studying QCD. Particularly, heavy quarkonia such as charmonium states are less relativistic, thus play a special role in probing strong interactions. CLEO recently has accumulated data taken at the ψ(2S) resonance, providing a total of 27M ψ(2S) decays. With the combination of this large statis...
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We investigate the theoretical uncertainties of P -wave charmonium decays into two pions, cJ ! + , 0 . Constraining the pion distributionamplitude from the recent precise data on F (Q ), we nd an order-ofmagnitude discrepancy between data and prediction. The disagreement persists even after inclusion of transverse degrees of freedom and Sudakov suppressions. We propose the colour-octet mechanis...
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Nonleptonic B to charmonium decays generally deviate from the factorization predictions. We study rescattering effects mediated by intermediate charmed mesons in this class of decay modes and, in particular, we consider B− → K−hc with hc the J PC = 1 c̄c meson, relating this mode to B− → K−χc0. We find B(B− → K−hc) large enough to be measured at the B factories, hence this process could be used ...
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We have used the CLEO-II detector at the Cornell Electron Storage Ring to study the inclusive production of charmonium mesons in a sample of 2.15 million BB events. We nd inclusive branching fractions of (1.130.040.06)% for B!J==X, (0.340.040.03)% for B! 0 X, and (0.400.060.04)% for B! c1 X. We also nd some evidence for the inclusive production of c2. An upper limit for the branching fraction o...
متن کاملPrompt Charmonium Production in Z Decays
The color-evaporation model quantitatively describes all data on photoproduction and hadroproduction of charmonium. Although the model is in part nonperturbative, the associated parameters can for instance be determined from the charmonium photoproduction data. At this point its predictions for the prompt production of ψ’s at the Z pole are made with no free parameters. We show here that this a...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2006
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.96.162003