/ 99 08 49 7 v 1 2 8 A ug 1 99 9 CCFM prediction on forward jets and F 2 : parton level predictions and a new hadron level Monte Carlo generator Cascade
نویسنده
چکیده
A solution of the CCFM equation for a description of both the structure function F 2 and the cross section of forward jet production as measured by the HERA experiments is obtained on the basis of the parton level Monte Carlo program Smallx. The treatment of the non-Sudakov form factor and the so-called " consistency constraint " are discussed. Following this a backward evolution scheme according to CCFM is developed which then is used to construct an efficient hadron level Monte Carlo program Cascade. The results from the forward evolution and the backward evolution Monte Carlos are compared and found to be consistent.
منابع مشابه
Hadronic final state predictions from CCFM: the hadron-level Monte Carlo generator Cascade∗
We discuss a practical formulation of backward evolution for the CCFM small-x evolution equation and show results from its implementation in the new Monte Carlo event-generator Cascade.
متن کاملCCFM prediction for F2 and forward jets at HERA
The parton evolution at small values of x is believed to be best described by the CCFM evolution equation [1], which for x → 0 is equivalent to the BFKL evolution equation [2] and for large x reproduce the standard DGLAP equations. The CCFM evolution equation takes coherence effects of the radiated gluons into account via angular ordering. On the basis of this evolution equation, the Monte Carl...
متن کاملA Monte Carlo Study on the Identification of Quark and Gluon Jets
Three jets events in the ee collisions at 91.2 GeV are investigated using both HERWIG and JETSET Monte Carlo generators. The angles between the three jets are used to identify the quark and gluon jets. The analysis at parton level is done to ensure the reasonableness of this method and an angular cut is ultilized to improve the purity of this identification. The multiplicity inside the identifi...
متن کاملThe CCFM Monte Carlo generator Cascade
Cascade is a full hadron level Monte Carlo event generator for ep, γp and pp̄ processes, which uses the CCFM evolution equation for the initial state cascade in a backward evolution approach supplemented with off shell matrix elements for the hard scattering. A detailed program description is given, with emphasis on parameters the user wants to change and common block variables which completely ...
متن کاملMonte Carlo Generators and the CCFM Equation a
Small-x final states are central to the understanding of small-x evolution in general. To understand final-state properties such as forward jet rates and transverse energy flow, it is important to have event generators which give a good description of the experimental data. It has, however, turned out to be difficult to produce such an event generator. To leading double-log accuracy, the CCFM [...
متن کامل