Extractingαsfrom electron-positron annihilation around 10 GeV

Extracting α s from Electron – Positron Annihilation around 10 GeV

The total cross section for electron–positron annihilation into hadrons is calculated in the region just below the B meson threshold. QCD corrections up to third order, quark mass effects, initial state radiation, the running of α QED and the tails of the Υ resonances are included in the prediction. For given α s the prediction is accurate to 0.5 percent. An experimental measurement with the co...

Charmed and Strange.baryon Production in 29 Gev Electron Positron Annihilation*

Baryon production is one of the least understood areas of hadron production in electron positron collisions. Early models of hadronization predicted that very few baryons should be produced. However, experiments have shown a very substantial rate of baryon production, and many different models have been proposed to explain this. One way to test these models, and to further probe the hadronizati...

ELECTRON - POSITRON ANNIHILATION ABOVE 2 GeV AND THE NEW PARTICIZS

Study of noncollinear two-charged-particle events produced in 29-GeV electron-positron annihilation.

This paper presents a study of events produced in 29 GeV electron-positron annihilation in which there are just two non-collinear charged particles, no detected photons, and two or more undetected particles. These events can be explained by attributing them primarily to the reactions e+e+ e+e-e+eand e+e--+ e+e-p+pwhere just two particles appear in the Mark II detector. There is no evidence for ...

Interference fragmentation functions in electron-positron annihilation

We study the process of electron-positron annihilation into back-to-back jets, where in each jet a pair of hadrons is detected. The orientation of these two pairs with respect to each other can be used to extract the interference fragmentation functions in a clean way, for instance from BELLE or BABAR experiment data. This is of relevance for studies of the transversity distribution function. I...