Study of the energy dependence of the underlying event in proton-antiproton collisions
T. AaltonenDivision of High Energy Physics, Department of Physics, University of Helsinki, FIN-00014, Helsinki, Finland andM. G. AlbrowFermi National Accelerator Laboratory, Batavia, Illinois 60510, USAS. AmerioUniversity of Padua, Padua, ItalyDante AmideiUniversity of Michigan, Ann Arbor, Michigan 48109, USAA. AnastassovFermi National Accelerator Laboratory, Batavia, Illinois 60510, USAAlberto AnnoviLaboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, ItalyJ. AntošComenius University, 842 48 Bratislava, Slovakia; Institute of Experimental Physics, 040 01 Kosice, SlovakiaG. ApollinariFermi National Accelerator Laboratory, Batavia, Illinois 60510, USAJ. A. AppelFermi National Accelerator Laboratory, Batavia, Illinois 60510, USAT. ArisawaWaseda University, Tokyo, JapanA. ArtikovJoint Institute for Nuclear Research, RU-141980 Dubna, RussiaJ. AsaadiTexas A&M University, College Station, United StatesW. AshmanskasFermi National Accelerator Laboratory, Batavia, Illinois 60510, USAB. AuerbachArgonne National Laboratory, Argonne, Illinois 60439, USAA. AurisanoTexas A&M University, College Station, United StatesF. AzfarUniversity of Oxford, Oxford, United KingdomW. BadgettFermi National Accelerator Laboratory, Batavia, Illinois 60510, USAT. BaeSungkyunkwan University, Suwon 440-746, Korea; Korea Institute of Science and Technology Information, Daejeon 305-806, Korea;A. Barbaro-GaltieriErnest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USAV. E. BarnesPurdue University West Lafayette, West Lafayette, United StatesB. A. BarnettThe Johns Hopkins University, Baltimore, Maryland 21218, USAP. BarriaUniversity of Siena, Siena, ItalyP. BartosComenius University, 842 48 Bratislava, Slovakia; Institute of Experimental Physics, 040 01 Kosice, SlovakiaM. BauceUniversity of Padua, Padua, ItalyF. BedeschiUniversity of Athens, 157 71 Athens, GreeceS. BehariFermi National Accelerator Laboratory, Batavia, Illinois 60510, USAG. BellettiniUniversity of Pisa, Pisa, ItalyJ. BellingerUniversity of Wisconsin–Madison, Madison, United StatesD. BenjaminDuke University, Durham, North Carolina 27708, USAA. BeretvasFermi National Accelerator Laboratory, Batavia, Illinois 60510, USAA. BhattiRockefeller University, New York, United StatesK. R. BlandBaylor University, Waco, Texas 76798, USAB. BlumenfeldThe Johns Hopkins University, Baltimore, Maryland 21218, USAA. BocciDuke University, Durham, North Carolina 27708, USAA. BodekUniversity of Rochester, Rochester, United StatesD. BortolettoPurdue University West Lafayette, West Lafayette, United StatesJ. BoudreauUniversity of Pittsburgh, Pittsburgh, United StatesA. BoveiaEnrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USAL. BrigliadoriIstituto Nazionale di Fisica Nucleare Bologna, I-40127 Bologna, ItalyC. BrombergMichigan State University, East Lansing, Michigan 48824, USAE. BrückenDivision of High Energy Physics, Department of Physics, University of Helsinki, FIN-00014, Helsinki, Finland andJ. BudagovJoint Institute for Nuclear Research, RU-141980 Dubna, RussiaH. S. BuddUniversity of Rochester, Rochester, United StatesK. BurkettFermi National Accelerator Laboratory, Batavia, Illinois 60510, USAG. BusettoUniversity of Padua, Padua, ItalyP. J. BusseyGlasgow University, Glasgow G12 8QQ, United KingdomP. ButtiUniversity of Pisa, Pisa, ItalyA. BuzatuGlasgow University, Glasgow G12 8QQ, United KingdomA. CalambaCarnegie Mellon University, Pittsburgh, Pennsylvania 15213, USAS. CamardaInstitut de Fisica d'Altes Energies, ICREA, Universitat Autonoma de Barcelona, E-08193, Bellaterra (Barcelona), SpainM. CampanelliUniversity College London, London WC1 E 6BT, United KingdomF. CanelliEnrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USAB. CarlsUniversity of Illinois, Urbana, Illinois 61801, USAD. CarlsmithUniversity of Wisconsin–Madison, Madison, United StatesR. CarosiUniversity of Athens, 157 71 Athens, GreeceS. CarrilloUniversity of Florida, Gainesville, Florida 32611, USAB. CasalInstituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander, SpainM. CasarsaUniversity of California, Los Angeles, Los Angeles, California 90024, USAA. CastroIstituto Nazionale di Fisica Nucleare Bologna, I-40127 Bologna, ItalyP. CatastiniHarvard University, Cambridge, Massachusetts 02138, USAD. CauzUniversity of Udine, Udine, ItalyV. CavaliereUniversity of Illinois, Urbana, Illinois 61801, USAA. CerriErnest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USAY. C. ChenInstitute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of ChinaM. ChertokUniversity of California, Davis, Davis, California 95616, USAG. ChiarelliUniversity of Athens, 157 71 Athens, GreeceG. ChlachidzeFermi National Accelerator Laboratory, Batavia, Illinois 60510, USAK. ChoSungkyunkwan University, Suwon 440-746, Korea; Korea Institute of Science and Technology Information, Daejeon 305-806, Korea;D. ChokheliJoint Institute for Nuclear Research, RU-141980 Dubna, RussiaA. ClarkUniversity of Geneva, CH-1211 Geneva 4, SwitzerlandC. ClarkeWayne State University, Detroit, United StatesM. E. ConveryFermi National Accelerator Laboratory, Batavia, Illinois 60510, USAJ. ConwayUniversity of California, Davis, Davis, California 95616, USAM. CorboFermi National Accelerator Laboratory, Batavia, Illinois 60510, USAM. CordelliLaboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, ItalyC. A. CoxUniversity of California, Davis, Davis, California 95616, USAD. J. CoxUniversity of California, Davis, Davis, United StatesM. CremonesiUniversity of California, Davis, Davis, California 95616, USAD. CruzTexas A&M University, College Station, United StatesJ. CuevasInstituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander, SpainR. CulbertsonFermi National Accelerator Laboratory, Batavia, Illinois 60510, USAN. d’AscenzoFermi National Accelerator Laboratory, Batavia, United StatesM. DattaFermi National Accelerator Laboratory, Batavia, Illinois 60510, USAP. de BarbaroUniversity of Rochester, Rochester, United StatesL. DemortierRockefeller University, New York, United StatesM. DeninnoIstituto Nazionale di Fisica Nucleare Bologna, I-40127 Bologna, ItalyM. d’ErricoUniversity of Padua, Padua, ItalyF. DevotoDivision of High Energy Physics, Department of Physics, University of Helsinki, FIN-00014, Helsinki, Finland andA. Di CantoUniversity of Pisa, Pisa, ItalyB. Di RuzzaBrookhaven National Laboratory, Upton, United StatesJ. DittmannBaylor University, Waco, Texas 76798, USAS. DonatiUniversity of Pisa, Pisa, ItalyM. D’OnofrioUniversity of Liverpool, Liverpool, United KingdomM. DorigoUniversity of Trieste, Trieste, ItalyA. DriuttiUniversity of Udine, Udine, ItalyK. EbinaWaseda University, Tokyo, JapanR. C. EdgarUniversity of Michigan, Ann Arbor, Michigan 48109, USAA. ElaginTexas A&M University, College Station, United StatesR. ErbacherUniversity of California, Davis, Davis, California 95616, USA
2015en
ABI
Abstract
We study charged particle production $(pT > 0.5 GeV/c, \eta <0.8)$ in proton-antiproton collisions at total center-of-mass energies $\sqrt{s} = 300 GeV$, 900 GeV, and 1.96 TeV. We use the direction of the charged particle with the largest transverse momentum in each event to define three regions of $\eta - \phi$ space: “toward”, “away”, and “transverse.” The average number and the average scalar pT sum of charged particles in the transverse region are sensitive to the modeling of the “underlying event.” The transverse region is divided into a MAX and MIN transverse region, which helps separate the “hard component” (initial and final-state radiation) from the “beam-beam remnant” and multiple parton interaction components of the scattering. The center-of-mass energy dependence of the various components of the event is studied in detail. The data presented here can be used to constrain and improve QCD Monte Carlo models, resulting in more precise predictions at the LHC energies of 13 and 14 TeV.
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Citations and references
Cited by 20 references