Adam Phillips, Fergus Wilson

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Presentation transcript:

Adam Phillips, Fergus Wilson The Herwig Minimum Bias Model University of Bristol Adam Phillips, Fergus Wilson & Nick Brook Final Tuned Version Herwig vs Tevatron Herwig vs Pythia Conclusions and Plans

Preferred parameter set for tuned Herwig minimum bias model: pmbm1 = 0.1 pmbm2 = 9.0 pmbn1 = 8.0 pmbn2 = 0.12 pmbn3 = -7.0 pmbk1 = 0.03 pmbk2 = 0.12 pmbp1 = 6.5 pmbp2 = 5.0 pmbp3 = 7.5

Model gives reasonable description of data

But, not entirely satisfactory - Improves on default model... but unable to recreate energy dependence over whole UA5 energy range

Herwig vs Tevatron Comparison to dnch/dh from CDF It fits!

Herwig vs Pythia minimum bias at 14TeV Choice of scale chosen to be the same in the 2 generators: as at same order Single diffraction turned off in Pythia Same pdf’s…

Herwig vs Pythia at LHC and multiplicity Pseudorapidity Pythia  larger h’s and greater nch with larger tails

Conclusions and Plans Herwig can describe (most) data from UA5 and Tevatron (1 order of magnitude) Herwig vs Pythia: same ballpark but significant differences Plans: further comparisons diffraction b physics sensitivity to pdf’s