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Martin, T.; Skands, P.; Farrington, S.
The European physical journal. C, Particles and fields, 05/2016, Letnik: 76, Številka: 5Journal Article
We define a new set of observables to probe the structure of the underlying event in hadron collisions. We use the conventional definition of the “transverse region” in jet events and, for a fixed window in jet p ⊥ , propose to measure several discriminating quantities as a function of the level of activity in the transverse region. The measurement of these observables in LHC data would reveal whether, e.g., the properties of “low-UE” events are compatible with equivalent measurements in e + e - collisions (jet universality), and whether the scaling behaviour towards “high-UE” events exhibits properties of non-trivial soft-QCD dynamics, such as colour reconnections or other collective phenomena. We illustrate at s = 13 TeV that significant discriminatory power is obtained in comparisons between MC models with varying treatments of collective effects, including Pythia 8 , epos , and Dipsy .
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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