16 research outputs found
HFAG Charm Mixing Averages
Recently the first evidence for charm mixing has been reported by several experiments. To provide averages of these mixing results and other charm results, a new subgroup of the Heavy Flavor Averaging Group has been formed. We here report on the method and results of averaging the charm mixing results
Charm and Charmonium Spectroscopy
Recent experimental results in charm and charmonium spectroscopy are
reviewed.Comment: 4 pages, contributed to the Proceedings of BEACH 2006, Lancater,
Englan
Measurement of the J/Psi Production Cross Section in 920 GeV/c Fixed-Target Proton-Nucleus Interactions
The mid-rapidity (dsigma_(pN)/dy at y=0) and total sigma_(pN) production
cross sections of J/Psi mesons are measured in proton-nucleus interactions.
Data collected by the HERA-B experiment in interactions of 920 GeV/c protons
with carbon, titanium and tungsten targets are used for this analysis. The
J/Psi mesons are reconstructed by their decay into lepton pairs. The total
production cross section obtained is sigma_(pN)(J/Psi) = 663 +- 74 +- 46
nb/nucleon. In addition, our result is compared with previous measurements
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Spectroscopy and New Particles in BaBar
Results on charmonium states and searches for pentaquark states at the BABAR experiment are presented
Kinematic distributions and nuclear effects of J/psi production in 920-GeV fixed-target proton-nucleus collisions
Measurements of the kinematic distributions of mesons produced in C, Ti and W collisions at in the Feynman- region and for transverse momentum up to are presented. The and dependencies of the nuclear suppression parameter, , are also given. The results are based on mesons in both the and decay channels. The data have been collected by the HERA-B experiment at the HERA proton ring of the DESY laboratory. The measurement explores the negative region of for the first time. The average value of in the measured region is . The data suggest that the strong nuclear suppression of production previously observed at high turns into an enhancement at negative