MC group: Institute on Parton Shower and Resummation

4 May 2009, 08:00 → 29 May 2009, 18:00 Europe/Berlin

Hannes Jung (DESY), Zoltan Nagy

Our aim is to bring together mainly theorists to discuss about various aspect of the parton shower algorithms and the re-summation schemes. The format of the workshop is rather unconventional. We would like to spend more time on discussion than having formal talks.

Monday 11 May

1 Fully Unintegrated Parton Distribution Functions

I will summarize recent progress in the development of an approach to factorization that maintains exact overall kinematics. The need for an approach to perturbative QCD factorization that maintains exact overall kinematics, particularly in situations where a detailed description of final states is desired, will be discussed. I will also emphasize the importance of identifying precise definitions for fully unintegrated parton distributions (and related objects) for ensuring universality.

Speaker: Ted Rogers

Slides T.Rogers.pdf

Wednesday 13 May

2 The exclusive NLO non-singlet kernel

I will report on the ongoing MC project, called KRKMC, in which NLO DGLAP evolution is performed for the exclusive multiparton distributions with the help of the exclusive kernels. These kernels are calculated within the two-parton phase space for bremsstrahlung subset of the Feynman diagrams of the non-singlet evolution, using Curci-Furmanski-Petronzio factorization scheme.

Speaker: Maciej Skrzypek

Slides M.Skrzypek.pdf

Monday 18 May

3 Introduction

Speaker: Z. Nagy

Slides PSRI09_-_Introduction.pdf

4 Some remarks on dipole showers and the DGLAP equation

I will report on an implementation of a parton shower based on the dipole factorization formulae and discuss in some detail that this shower algorithm reproduces the DGLAP equation. Further discussed is the concept of infrared-sensible evolution variables.

Speaker: Stefan Weinzierl

Slides desy2.pdf

5 Phase space effects on dipole showers and the DGLAP equation

I will discuss the possible conflict between dipole cascades and DGLAP evolution suggested by Dokshitzer and Marchesini. In e+e- annihilation gluon emissions with high p_t have a very limited phase space. This affects the possible exponentiation in DGLAP evolution. In particular I will discuss the influence of these limitations in the angular ordered cascade à la HERWIG, and in the k_t-ordered cascade à la ARIADNE.

Speaker: Gösta Gustafson

Slides desymay.pdf

Tuesday 19 May

6 pT resummation for colour singlet production

Speaker: Anna Kulesza

Slides A.Kulesza.pdf

7 QCD vs. MC: Drell-Yan pT distribution

Speaker: Zoltan Nagy

Slides Z.Nagy.pdf

8 Event shapes and jet rates in electron - positron annihilation

Speaker: S. Weinzierl

Slides desy3.pdf

Wednesday 20 May

9 Parton Shower based on Catani-Seymour dipole factorization

Speaker: Simon Plaetzer

Slides S.Plaetzer.pdf

Friday 22 May

10 Comments on DY discussion (white board)

Speaker: S. Plaetzer

Slides Snapshot_2009-05-24_12-30-59.pdf

11 CKKW-L merging at tree- and loop-level

Speaker: Leif Lönnblad

12 Inclusive Partile in NC & CC DIS at NLO level

Speaker: C. Sandoval

Slides C.Sandoval.pdf

13 Fragmentation function: AKK update

Speaker: S. Albino

Slides S.Albino.pdf

14 t → B+X at NLO level

Speaker: M. Moosari Nejed