We compare QCD theoretical predictions for heavy flavoured mesons fragmentation spectra in e(+)e(-) annihilation with data from CLEO, BELLE and LEP. We include several effects in our calculation: next-to-leading order initial conditions, evolution and coefficient functions. Soft-gluon effects are resummed at next-to-leading-log accuracy. A matching condition for the crossing of the bottom threshold in evolution is also implemented at next-to-leading order accuracy. Important initial-state electromagnetic radiation erects in the CLEO and BELLE data are accounted for. We find that, with reasonably simple choices of a non-perturbative correction to the fixed-order initial condition for the evolution, the data from CLEO and BELLE can be fitted with remarkable accuracy. The fitted fragmentation function, when evolved to LEP energies, does not however represent fairly the D* fragmentation spectrum measured by ALEPH. Large non-perturbative corrections to the coefficient functions of the meson spectrum are needed in order to reconcile CLEO/BELLE and ALEPH results. Non-perturbative parameters extracted from the fits to e(+)e(-) fragmentation data for D/D* and B mesons are tabulated. They can be employed in the theoretical predictions for the production of charmed and bottomed mesons in hadron-hadron, photon-hadron and photon-photon collisions

Cacciari, M., Nason, P., Oleari, C. (2006). A study of heavy flavoured meson fragmentation functions in e(+)e(-) annihilation. JOURNAL OF HIGH ENERGY PHYSICS, 2006(4) [10.1088/1126-6708/2006/04/006].

A study of heavy flavoured meson fragmentation functions in e(+)e(-) annihilation

Nason, P;OLEARI, CARLO
2006

Abstract

We compare QCD theoretical predictions for heavy flavoured mesons fragmentation spectra in e(+)e(-) annihilation with data from CLEO, BELLE and LEP. We include several effects in our calculation: next-to-leading order initial conditions, evolution and coefficient functions. Soft-gluon effects are resummed at next-to-leading-log accuracy. A matching condition for the crossing of the bottom threshold in evolution is also implemented at next-to-leading order accuracy. Important initial-state electromagnetic radiation erects in the CLEO and BELLE data are accounted for. We find that, with reasonably simple choices of a non-perturbative correction to the fixed-order initial condition for the evolution, the data from CLEO and BELLE can be fitted with remarkable accuracy. The fitted fragmentation function, when evolved to LEP energies, does not however represent fairly the D* fragmentation spectrum measured by ALEPH. Large non-perturbative corrections to the coefficient functions of the meson spectrum are needed in order to reconcile CLEO/BELLE and ALEPH results. Non-perturbative parameters extracted from the fits to e(+)e(-) fragmentation data for D/D* and B mesons are tabulated. They can be employed in the theoretical predictions for the production of charmed and bottomed mesons in hadron-hadron, photon-hadron and photon-photon collisions
Articolo in rivista - Articolo scientifico
Heavy-flavor fragmentation function
English
Cacciari, M., Nason, P., Oleari, C. (2006). A study of heavy flavoured meson fragmentation functions in e(+)e(-) annihilation. JOURNAL OF HIGH ENERGY PHYSICS, 2006(4) [10.1088/1126-6708/2006/04/006].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/154463
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