4 research outputs found

    CMS pythia 8 colour reconnection tunes based on underlying-event data

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    New sets of parameter tunes for two of the colour reconnection models, quantum chromodynamics-inspired and gluon-move, implemented in the pythia 8 event generator, are obtained based on the default CMS pythia 8 underlying-event tune, CP5. Measurements sensitive to the underlying event performed by the CMS experiment at centre-of-mass energies s√=7 and 13Te\hspace{-.08em}V, and by the CDF experiment at 1.96Te\hspace{-.08em}V are used to constrain the parameters of colour reconnection models and multiple-parton interactions simultaneously. The new colour reconnection tunes are compared with various measurements at 1.96, 7, 8, and 13Te\hspace{-.08em}V including measurements of the underlying-event, strange-particle multiplicities, jet substructure observables, jet shapes, and colour flow in top quark pair (tt¯) events. The new tunes are also used to estimate the uncertainty related to colour reconnection modelling in the top quark mass measurement using the decay products of tt¯ events in the semileptonic channel at 13Te\hspace{-.08em}V

    CMS pythia  8 colour reconnection tunes based on underlying-event data

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    Abstract New sets of parameter tunes for two of the colour reconnection models, quantum chromodynamics-inspired and gluon-move, implemented in the pythia  8 event generator, are obtained based on the default CMS pythia  8 underlying-event tune, CP5. Measurements sensitive to the underlying event performed by the CMS experiment at centre-of-mass energies s=7\sqrt{s}=7 s = 7 and 13  TeV\,\text {Te\hspace{-.08em}V} Te V , and by the CDF experiment at 1.96  TeV\,\text {Te\hspace{-.08em}V} Te V are used to constrain the parameters of colour reconnection models and multiple-parton interactions simultaneously. The new colour reconnection tunes are compared with various measurements at 1.96, 7, 8, and 13  TeV\,\text {Te\hspace{-.08em}V} Te V including measurements of the underlying-event, strange-particle multiplicities, jet substructure observables, jet shapes, and colour flow in top quark pair ( ttˉ{{\text {t}} {}{\bar{\text {t}}}} t t ¯ ) events. The new tunes are also used to estimate the uncertainty related to colour reconnection modelling in the top quark mass measurement using the decay products of ttˉ{{\text {t}} {}{\bar{\text {t}}}} t t ¯ events in the semileptonic channel at 13  TeV\,\text {Te\hspace{-.08em}V} Te V

    CMS pythia  8 colour reconnection tunes based on underlying-event data

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