Abstract
We present 9 new tunes of the -ordered shower and underlying-event model in Pythia 6.4. These “Perugia” tunes update and supersede the older “S0” family. The data sets used to constrain the models include hadronic decays at LEP, Tevatron min-bias data at 630, 1800, and 1960 GeV, Tevatron Drell-Yan data at 1800 and 1960 GeV, and SPS min-bias data at 200, 546, and 900 GeV. In addition to the central parameter set, called “Perugia 0,” we introduce a set of 8 related “Perugia variations” that attempt to systematically explore soft, hard, parton density, and color structure variations in the theoretical parameters. Based on these variations, a best-guess prediction of the charged track multiplicity in inelastic, nondiffractive minimum-bias events at the LHC is made. Note that these tunes can only be used with Pythia 6, not with Pythia 8.
5 More- Received 28 June 2010
DOI:https://doi.org/10.1103/PhysRevD.82.074018
© 2010 The American Physical Society