Jet fragmentation in e + e − annihilation
نویسندگان
چکیده
A short review of theoretical and experimental results on fragmentation in e + e − annihilation is presented. Starting with an introduction of the concept of fragmentation functions in e + e − annihilation, aspects of scaling violation, multiplicities, small and large x, longitudinal, gluon, light and heavy quark fragmentation are summarized.
منابع مشابه
Jet fragmentation and gauge/string duality
We consider an analog of e+e− annihilation in gauge theories which have a dual string description in asymptotically AdS5 space and discuss the nature of jet fragmentation. We construct the timelike anomalous dimension which governs the scale dependence of the fragmentation function. In the limit of infinite ’t Hooft coupling, the average multiplicity rises linearly with the energy and the inclu...
متن کاملMeasurement of CY, from Hadron Jets in e+e- Annihilation at fi of 29 GeV*
A study of the lateral development of jets of hadrons produced in electronpositron annihilation has been used to determine the strong coupling constant, cxS. .a -. -. Data were obtained with the MAC detector at PEP at fi = 29 GeV. Based on the parton calculations of Gottschalk and Shatz, a value for oy, of 0.133 f O.O05(stat) f O.OOS(syst) h as b een determined for string fragmentation, and 0.1...
متن کاملAnnihilation to Next-to-leading Order Accuracy *
We discuss the production of two hadrons in e + e − annihilation within the framework of perturbative QCD. The cross section for this process is calculated to next-to-leading order accuracy with a selection of variables that allows the consideration of events where the two hadrons are detected in the same jet. In this configuration we contemplate the possibility that the hadrons come from a dou...
متن کاملبررسی رویدادهای چند جتی در نابودی الکترون - پوزیترون
Analysis of electron – positron annihilation into hadrons in the range of energies above 60 GeV shows that apart from two jet events, there are evidence for three jet events that according to the QCD theory interpreted as a gluon radiation by a quark. However, the higher order diagrams lead to four jet events. In this paper, we study the fragmentation of quarks and gluons into hadronic jets . ...
متن کاملA complete O ( αα s ) calculation of the Photon + 1 Jet Rate in e + e − annihilation
We present a complete calculation of the photon + 1 jet rate in e+e− annihilation up to O(ααs). Although formally of next-to-leading order in perturbation theory, this calculation contains several ingredients appropriate to a next-to-next-to-leading order calculation of jet observables. In particular, we describe a generalization of the commonly used phase space slicing method to isolate the si...
متن کامل