Measurement ofb-Quark Fragmentation Fractions inpp¯Collisions ats=1.8TeV

THE ROLE OF QUARK POLARIZATION IN HEAVY QUARK FRAGMENTATION

We calculate the exact fragmentation functions for c and b quark fragmentation taking into account the spin orientation of the initial heavy quark in the form of analytical and rather simple expressions. Our calculations show that spin orientation may have an important effect on the fragmentation spectrum. This effect is more striking in the cases of c ?D, D*; c? ? , ? , and ?B , B *.

Measurement of ratios of fragmentation fractions for bottom hadrons in p(p)over-bar collisions at root s=1.96 TeV

Fragmentation measurement using image processing

In this research, first of all, the existing problems in fragmentation measurement are reviewed for the sake of its fast and reliable evaluation. Then, the available methods used for evaluation of blast results are mentioned. The produced errors especially in recognizing the rock fragments in computer-aided methods, and also, the importance of determination of their sizes in the image analysis ...

Heavy-Quark Fragmentation

We study perturbative and non-perturbative aspects of heavy-quark fragmentation into hadrons, emphasizing the large-x region, where x is the energy fraction of the detected hadron. We first prove that when the moment index N and the quark mass m get large simultaneously with the ratio NΛ/m fixed, the fragmentation function depends on this ratio alone. This opens up the way to formulate the non-...

Ratios of bottom meson branching fractions involving J/ psi mesons and determination of b quark fragmentation fractions.

We report a measurement of the ratios of the decay rates of the B, B and B s mesons into exclusive final states containing a J/ψ meson. The final states were selected from 19.6 pb of pp̄ collisions recorded by the Collider Detector at Fermilab. These data are interpreted to determine the b quark fragmentation fractions fu, fd and fs. We also determine the branching fractions for the decay modes ...