New CMS PYTHIA 8 tunes using NLO or NNLO PDFs describe minimum-bias, underlying-event, and jet data in top-quark pair events at a level comparable to LO-based tunes.
Measurement of the underlying event activity in inclusive Z boson production in proton-proton collisions at $\sqrt{s} = $ 13 TeV
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abstract
This paper presents a measurement of the underlying event activity in proton-proton collisions at a center-of-mass energy of 13 TeV, performed using inclusive Z boson production events collected with the CMS experiment at the LHC. The analyzed data correspond to an integrated luminosity of 2.1 fb$^{-1}$. The underlying event activity is quantified in terms of the charged particle multiplicity, as well as of the scalar sum of the charged particles' transverse momenta in different topological regions defined with respect to the Z boson direction. The distributions are unfolded to the stable particle level and compared with predictions from various Monte Carlo event generators, as well as with similar CDF and CMS measurements at center-of-mass energies of 1.96 and 7 TeV respectively.
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Quantum Chromodynamics Monte Carlo Tuning Studies in CMS
New CMS PYTHIA 8 tunes using NLO or NNLO PDFs describe minimum-bias, underlying-event, and jet data in top-quark pair events at a level comparable to LO-based tunes.