The Perugia Tunes

Details The Perugia Tunes The Perugia Tunes

2009-05-20

arxiv.org/abs/0905.3418v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 5 figures. Presented at 1st International Workshop on Multiple Partonic Interactions at the LHC, Perugia, Italy, Oct

Scientific paper

We present 7 new tunes of the pT-ordered shower and underlying-event model in Pythia 6.4. These "Perugia" tunes update and supersede the older "S0" family. The new tunes include the updated LEP fragmentation and flavour parameters reported on by H. Hoeth at this workshop. The hadron-collider specific parameters were then retuned (manually) using Tevatron min-bias data from 630, 1800, and 1960 GeV, Tevatron Drell-Yan data at 1800 and 1960 GeV, as well as SPS min-bias data at 200, 540, and 900 GeV. In addition to the central parameter set, related tunes exploring systematically soft, hard, parton density, and color structure variations are included. Based on these variations, a best-guess prediction of the charged track multiplicity in inelastic, nondiffractive minimum-bias events at the LHC is made.

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