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تسجيل مستخدم جديدBottomonium and Charmonium at CLEO
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تأليف
R.E. Mitchell
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The bottomonium and charmonium systems have long proved to be a rich source of QCD physics. Recent CLEO contributions in three disparate areas are presented: (1) the study of quark and gluon hadronization using $Upsilon$ decays; (2) the interpretation of heavy charmonium states, including non-$cbar{c}$ candidates; and (3) the exploration of light quark physics using the decays of narrow charmonium states as a well-controlled source of light quark hadrons.
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Recent results on Charmonium decays are reviewed which includes two-, three- and four-body decays of $chi_{cJ}$ states, observations of Y(4260) through $pipi J/psi$ transitions, precise measurements of $M(D^0)$, $M(eta)$ as well as $mathcal{B}(etato X)$.
Many new states in the charmonium and bottomonium mass region were recently discovered by the BaBar, Belle and CDF Collaborations. We use the QCD Sum Rule approach to study the possible structure of some of these states. In particular we identify the
recently observed bottomonium-like resonance $Z_b^+(10610)$ with the first excitation of the tetraquark $X_b(1^{++})$, the analogue of the X(3872) state in the charm sector.
The charmonium system provides an opportunity to explore a wide variety of topics in hadronic physics. Studies of the properties of and transitions among cc-bar states yield insight into relativistic and non-perturbative QCD effects. At the same time
, studies of the decays of charmonium states are a window into gluon dynamics and the role of glueball mixing in the production of light quark states. A collection of preliminary results utilizing the full CLEO-c psi(2S) data sample is presented including two-body branching fractions of chi_cJ decays, a precision measurement of the h_c mass, and results on the hindered M1 transition: psi(2S) -> gamma eta_c.
Recent results from CLEO on the search for CP violation in beauty and charm meson decays are reviewed.
In the present work, we study the OZI-allowed three body open flavor decay properties of higher vector charmonium and bottomonium states with an extended quark pair creation model. For the bottomonium system, we get that (i) the $BBpi$ and $B^*B^*pi$
partial decay widths of the $Upsilon(5S)$ state are consistent with the experiment, and the $BB^*pi$ partial decay width of the $Upsilon(5S)$ state is smaller but very close to the Belles experiment. Meanwhile, (ii) the $BB^*pi$ and $B^*B^*pi$ decay widths of $Upsilon(11020)$ can reachs $2sim3$ MeV. In addition, (iii) for the most of higher vector charmonium states, the partial decay widths of the $DD^*pi$ and $D^*D^*pi$ modes can reach up to several MeV, which may be observed in future experiments.
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