ar X iv : h ep - p h / 06 10 02 2 v 1 2 O ct 2 00 6 Matrix elements and Parton Shower in the event generator BABAYAGA

ar X iv : h ep - p h / 02 12 21 6 v 1 1 6 D

A new method to construct event-generators based on next-to-leading order QCD matrix-elements and leading-logarithmic parton showers is proposed. Matrix elements of loop diagram as well as those of a tree level can be generated using an automatic system. A soft/collinear singularity is treated using a leading-log subtraction method. Higher order re-summation of the soft/collinear correction by ...

ar X iv : h ep - p h / 02 06 25 4 v 1 2 5 Ju n 20 02 Soft and hard QCD in charmonium production

Hard and soft QCD dynamics are both important in charmonium hadroproduction, as presented here through a next-to-leading order QCD matrix element calculation combined with the colour evaporation model. Observed x F and p ⊥ distributions of J/ψ in hadroproduction are reproduced. Quite similar results can also be obtained with a Monte Carlo event generator where c ¯ c pairs are instead produced t...

ar X iv : h ep - l at / 0 11 00 06 v 1 2 O ct 2 00 1 1 Matrix elements of ∆ S = 2 operators with Wilson fermions

ar X iv : h ep - l at / 0 11 00 06 v 2 3 O ct 2 00 1 1 Matrix elements of ∆ S = 2 operators with Wilson fermions

ar X iv : h ep - p h / 07 03 24 0 v 1 2 2 M ar 2 00 7 IFJPAN - IV - 2006 - 7 Propagation of Uncertainty in a Parton Shower ∗

Presented here is a technique of propagating uncertainties through the parton shower by means of an alternate event weight. This technique provides a mechanism to systematically quantify the effect of variations of certain components of the parton shower leading to a novel approach to probing the physics implemented in a parton shower code and understanding its limitations. Further, this approa...