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Published byBarry Richard Modified over 9 years ago
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Working group C summary Hadronic final states theory Mrinal Dasgupta
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Collinear factorisation in QCD G.Rodrigo Factorisation in colour space : splitting matrix Understanding multiple collinear limit of QCD important : fixed order calculations, resummations, PDF evolution etc.
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Derivation of one to three splitting functions :
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Dijet rates with symmetric Et cuts A.Banfi Resummation is potentially very instructive : multiparton and involving jet definition
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Work in progress involves matching to fixed NLO and understanding resummation effects with different algorithms (NLL terms).
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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)
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Computer automated resummations Gavin Salam
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Also need to test if exponentiates With all the information in place : Recursive IRC safety
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Example : Transverse thrust at the Tevatron
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Frank Krauss Monte Carlo models at the LHC
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New event generators : SHERPA
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THEPEG, Pythia7 and ARIADNE Leif Lonnblad
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ME +PS matching in Ariadne W production at the Tevatron :
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The new event generator HERWIG++ Stefan Gieseke New parton shower, different evolution variable Better coverage of soft gluon phase space
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B fragmentation function
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Photon production at hadron colliders
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Azimuthal angle distribution
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Gamma pair Qt distribution
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