Event generator tunes obtained from underlying event and multiparton scattering measurements

• Published in: The European physical journal. C, Particles and fields Vol. 76; no. 3; p. 155
• Main Authors: Asilar, E., Cornelis, T., De Wolf, E. A., De Bruyn, I., Keaveney, J., Olbrechts, A., Zaganidis, N., Ceard, L., Rykaczewski, H., Lampén, T., Lehti, S., Tuominen, E., Coubez, X., Mirabito, L., Heidemann, C., Radziej, M., Bartosik, N., Behrens, U., Flucke, G., Centis Vignali, M., Hoffmann, M., Chwalek, T., Descroix, A., Roscher, F., Williamson, S., Kyriakis, A., Saoulidou, N., Tziaferi, E., Paradas, E., Kumar, Ashok, Garg, R. B., Majumdar, N., Kumar, V., Safarzadeh, B., Guiducci, L., Perrotta, A., Tosi, N., Cappello, G., Paoletti, S., Tosi, S., Gerosa, R., Checchia, P., Santocchia, A., Androsov, K., Boccali, T., Fiori, F., Gyun, D., Park, S. K., Choi, M., Nawrocki, K., Olszewski, M., Afanasiev, S., Bunin, P., Golutvin, I., Smirnov, V., Azhgirey, I., Cirkovic, P., Alcaraz Maestre, J., Escalante Del Valle, A., Puerta Pelayo, J., Di Marco, E., Lucchini, M. T., Orsini, L., Petrucciani, G., Kaestli, H. C., Ngadiuba, J., Grundler, U., Dozen, C., Sunar Cerci, D., Poll, A., Bell, K. W., Brown, R. M., Calligaris, L., Williams, T., Citron, M., Malik, S., Hatakeyama, K., Cox, P. T., Smith, J., Wimpenny, S., Gouskos, L., Richman, J., Nicolas Kaufman, G., Green, D., Joshi, U., Noonan, D., Haytmyradov, M., Khristenko, V., Roskes, J., Baron, O., Cali, I. A., Avdeeva, E., Dolen, J., Brinkerhoff, A., Driga, O., Sun, J., Park, M., York, A., Greene, S., Perry, T.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 17.03.2016; Springer; Springer Nature B.V; Springer Verlag (Germany)
• Subjects: Analysis; Astronomy; Astrophysics and Cosmology; Elementary Particles; Hadrons; Heavy Ions; High Energy Physics - Experiment; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Particle collisions; Physics; Physics and Astronomy; Probability distributions; Quantum Field Theories; Quantum Field Theory; Regular - Experimental Physics; Regular Article - Experimental Physics; String Theory
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-016-3988-x

New sets of parameters (“tunes”) for the underlying-event (UE) modelling of the pythia 8, pythia6 and herwig++ Monte Carlo event generators are constructed using different parton distribution functions. Combined fits to CMS UE proton–proton ( p p ) data at s = 7 TeV and to UE proton–antiproton ( p p ¯ ) data from the CDF experiment at lower s , are used to study the UE models and constrain their parameters, providing thereby improved predictions for proton–proton collisions at 13 TeV . In addition, it is investigated whether the values of the parameters obtained from fits to UE observables are consistent with the values determined from fitting observables sensitive to double-parton scattering processes. Finally, comparisons are presented of the UE tunes to “minimum bias” (MB) events, multijet, and Drell–Yan ( q q ¯ → Z / γ ∗ → lepton-antilepton+jets) observables at 7 and 8 TeV , as well as predictions for MB and UE observables at 13 TeV .