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Working group C summary Hadronic final states theory

Working group C summary Hadronic final states theory. Mrinal Dasgupta. Collinear factorisation in QCD. G.Rodrigo. Understanding multiple collinear limit of QCD important : fixed order calculations, resummations, PDF evolution etc. Factorisation in colour space : splitting matrix.

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Working group C summary Hadronic final states theory

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  1. Working group C summary Hadronic final states theory Mrinal Dasgupta

  2. Collinear factorisation in QCD G.Rodrigo Understanding multiple collinear limit of QCD important : fixed order calculations, resummations, PDF evolution etc. Factorisation in colour space : splitting matrix

  3. Derivation of one to three splitting functions :

  4. Dijet rates with symmetric Et cuts A.Banfi Resummation is potentially very instructive : multiparton and involving jet definition

  5. Work in progress involves matching to fixed NLO and understanding resummation effects with different algorithms (NLL terms).

  6. Sudakov logs and power corrections Lorenzo Magnea Power corrections to event shape distributions : Dokshitzer-Webber approach is to shift the perturbative distribution by an amount proportional to 1/Q. Approximation works over large range but for very small values would break down. Need shape function ansatz (Korchemsky and Sterman)

  7. Computer automated resummations Gavin Salam

  8. Also need to test if exponentiates Recursive IRC safety With all the information in place :

  9. Example : Transverse thrust at the Tevatron

  10. Monte Carlo models at the LHC Frank Krauss

  11. New event generators : SHERPA

  12. THEPEG, Pythia7 and ARIADNE • Leif Lonnblad

  13. ME +PS matching in Ariadne W production at the Tevatron :

  14. The new event generator HERWIG++ • Stefan Gieseke New parton shower , different evolution variable Better coverage of soft gluon phase space

  15. B fragmentation function

  16. Photon production at hadron colliders

  17. Azimuthal angle distribution

  18. Gamma pair Qt distribution

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