منابع مشابه
Heavy-quark recombination in Z0 decay
We briefly review the recent advances of heavy-quark recombination mechanism. This mechanism predicts a class of power-suppressed 3-jet events in Z0 decay, such as bbq and bbq. Furthermore, heavy quark fragmentation function also receives a contribution from this mechanism. Some light can be shed on the scaling of the maximum of the fragmentation function for S-wave heavy hadrons. We finally co...
متن کاملElectromagnetic production of quarkonium in Z0 decay.
The decay Z → Q+ ll, where Q is a J = 1 quarkonium state, has a very clean final state, which should make it easy to detect. The branching ratio of this mode is greater than 10 for ρ, φ, and ψ, indicating that these processes may be detectable at LEP. Well over one million Z decay events have been accumulated at LEP, and further improvements are expected. This makes it possible to investigate r...
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P. F. Mantica, B. A. Brown, A. D. Davies, T. Glasmacher, D. E. Groh, M. Horoi, S. N. Liddick, D. J. Morrissey, A. C. Morton, W. F. Mueller, H. Schatz, A. Stolz, and S. L. Tabor National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA Department of Physics and ...
متن کاملPrecise measurement of the b-quark fragmentation function in Z0 boson decays
We have developed a new technique for inclusive reconstruction of the energy of B hadrons. The excellent efficiency and resolution of this technique allow us to make the most precise determination of the b-quark fragmentation function, using e(+)e(-)-->Z0 decays recorded in the SLAC Large Detector experiment. We compared our measurement with the predictions of a number of fragmentation models. ...
متن کاملZ0 decay into charmonium via charm quark fragmentation.
In decays of the Z, the dominant mechanism for the direct production of charmonium states is the decay of the Z into a charm quark or antiquark followed by its fragmentation into the charmonium state. We calculate the fragmentation functions describing the splitting of charm quarks into S-wave charmonium states to leading order in the QCD coupling constant. Leading logarithms of MZ/mc are summe...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1990
ISSN: 0370-2693
DOI: 10.1016/0370-2693(90)91666-y