Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-01-27
Eur.Phys.J.C71:1628,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages
Scientific paper
10.1140/epjc/s10052-011-1628-z
Measurements of inclusive observables, such as particle multiplicities and momentum spectra, have already delivered important information on soft-inclusive ("minimum-bias") physics at the Large Hadron Collider. In order to gain a more complete understanding, however, it is necessary to include also observables that probe the structure of the studied events. We argue that forward-backward (FB) correlations and event-shape observables may be particulary useful first steps in this respect. We study the sensitivity of several different types of FB correlations and two event shape variables - transverse thrust and transverse thrust minor - to various sources of theoretical uncertainty: multiple parton interactions, parton showers, colour (re)connections, and hadronization. The power of each observable to furnish constraints on Monte Carlo models is illustrated by including comparisons between several recent, and qualitatively different, PYTHIA 6 tunes, for pp collisions at sqrt(s) = 900 GeV.
Skands Peter
Wraight Kenneth
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