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IRIS
New sets of CMS underlying-event parameters (“tunes”) are presented for the pythia8 event generator. These tunes use the NNPDF3.1 parton distribution functions (PDFs) at leading (LO), next-to-leading (NLO), or next-to-next-to-leading (NNLO) orders in perturbative quantum chromodynamics, and the strong coupling evolution at LO or NLO. Measurements of charged-particle multiplicity and transverse momentum densities at various hadron collision energies are fit simultaneously to determine the parameters of the tunes. Comparisons of the predictions of the new tunes are provided for observables sensitive to the event shapes at LEP, global underlying event, soft multiparton interactions, and double-parton scattering contributions. In addition, comparisons are made for observables measured in various specific processes, such as multijet, Drell–Yan, and top quark-antiquark pair production including jet substructure observables. The simulation of the underlying event provided by the new tunes is interfaced to a higher-order matrix-element calculation. For the first time, predictions from pythia8 obtained with tunes based on NLO or NNLO PDFs are shown to reliably describe minimum-bias and underlying-event data with a similar level of agreement to predictions from tunes using LO PDF sets.
Extraction and validation of a new set of CMS pythia8 tunes from underlying-event measurements
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Johnson;U. Joshi;B. Klima;M. J. Kortelainen;B. Kreis;S. Lammel;D. Lincoln;R. Lipton;M. Liu;T. Liu;J. Lykken;K. Maeshima;J. M. Marraffino;D. Mason;P. McBride;P. Merkel;S. Mrenna;S. Nahn;V. O’Dell;K. Pedro;C. Pena;O. Prokofyev;G. Rakness;F. Ravera;A. Reinsvold;L. Ristori;A. Savoy-Navarro;B. Schneider;E. Sexton-Kennedy;A. Soha;W. J. Spalding;L. Spiegel;S. Stoynev;J. Strait;N. Strobbe;L. Taylor;S. Tkaczyk;N. V. Tran;L. Uplegger;E. W. Vaandering;C. Vernieri;M. Verzocchi;R. Vidal;M. Wang;H. A. Weber;A. Whitbeck;D. Acosta;P. Avery;P. Bortignon;D. Bourilkov;A. Brinkerhoff;L. Cadamuro;A. Carnes;D. Curry;R. D. Field;S. V. Gleyzer;B. M. Joshi;J. Konigsberg;A. Korytov;K. H. Lo;P. Ma;K. Matchev;G. Mitselmakher;D. Rosenzweig;K. Shi;D. Sperka;J. Wang;S. Wang;X. Zuo;Y. R. Joshi;S. Linn;A. Ackert;T. Adams;A. Askew;S. Hagopian;V. Hagopian;K. F. Johnson;T. Kolberg;G. Martinez;T. Perry;H. Prosper;A. Saha;C. Schiber;R. Yohay;M. M. Baarmand;V. Bhopatkar;S. Colafranceschi;M. Hohlmann;D. Noonan;M. Rahmani;T. 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Xiao;W. Xie;T. Cheng;J. Dolen;N. Parashar;Z. Chen;K. M. Ecklund;S. Freed;F. J. M. Geurts;M. Kilpatrick;Arun Kumar;W. Li;B. P. Padley;R. Redjimi;J. Roberts;J. Rorie;W. Shi;Z. Tu;A. Zhang;A. Bodek;P. de Barbaro;R. Demina;Y. t. Duh;J. L. Dulemba;C. Fallon;T. Ferbel;M. Galanti;A. Garcia-Bellido;J. Han;O. Hindrichs;A. Khukhunaishvili;E. Ranken;P. Tan;R. Taus;B. Chiarito;J. P. Chou;Y. Gershtein;E. Halkiadakis;A. Hart;M. Heindl;E. Hughes;S. Kaplan;R. Kunnawalkam Elayavalli;S. Kyriacou;I. Laflotte;A. Lath;R. Montalvo;K. Nash;M. Osherson;H. Saka;S. Salur;S. Schnetzer;D. Sheffield;S. Somalwar;R. Stone;S. Thomas;P. Thomassen;A. G. Delannoy;J. Heideman;G. Riley;S. Spanier;O. Bouhali;A. Celik;M. Dalchenko;M. De Mattia;A. Delgado;S. Dildick;R. Eusebi;J. Gilmore;T. Huang;T. Kamon;S. Luo;D. Marley;R. Mueller;D. Overton;L. Perniè;D. Rathjens;A. Safonov;N. Akchurin;J. Damgov;F. De Guio;P. R. Dudero;S. Kunori;K. Lamichhane;S. W. Lee;T. Mengke;S. Muthumuni;T. Peltola;S. Undleeb;I. Volobouev;Z. Wang;S. Greene;A. Gurrola;R. Janjam;W. Johns;C. Maguire;A. Melo;H. Ni;K. Padeken;F. Romeo;J. D. Ruiz Alvarez;P. Sheldon;S. Tuo;J. Velkovska;M. Verweij;Q. Xu;M. W. Arenton;P. Barria;B. Cox;R. Hirosky;M. Joyce;A. Ledovskoy;H. Li;C. Neu;T. Sinthuprasith;Y. Wang;E. Wolfe;F. Xia;R. Harr;P. E. Karchin;N. Poudyal;J. Sturdy;P. Thapa;S. Zaleski;J. Buchanan;C. Caillol;D. Carlsmith;S. Dasu;I. De Bruyn;L. Dodd;B. Gomber;M. Grothe;M. Herndon;A. Hervé;U. Hussain;P. Klabbers;A. Lanaro;K. Long;R. Loveless;T. Ruggles;A. Savin;V. Sharma;N. Smith;W. H. Smith;N. Woods
2020-01-01
Abstract
New sets of CMS underlying-event parameters (“tunes”) are presented for the pythia8 event generator. These tunes use the NNPDF3.1 parton distribution functions (PDFs) at leading (LO), next-to-leading (NLO), or next-to-next-to-leading (NNLO) orders in perturbative quantum chromodynamics, and the strong coupling evolution at LO or NLO. Measurements of charged-particle multiplicity and transverse momentum densities at various hadron collision energies are fit simultaneously to determine the parameters of the tunes. Comparisons of the predictions of the new tunes are provided for observables sensitive to the event shapes at LEP, global underlying event, soft multiparton interactions, and double-parton scattering contributions. In addition, comparisons are made for observables measured in various specific processes, such as multijet, Drell–Yan, and top quark-antiquark pair production including jet substructure observables. The simulation of the underlying event provided by the new tunes is interfaced to a higher-order matrix-element calculation. For the first time, predictions from pythia8 obtained with tunes based on NLO or NNLO PDFs are shown to reliably describe minimum-bias and underlying-event data with a similar level of agreement to predictions from tunes using LO PDF sets.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/1488453
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simulazione ASN
Il report seguente simula gli indicatori relativi alla propria produzione scientifica in relazione alle soglie ASN 2023-2025 del proprio SC/SSD. Si ricorda che il superamento dei valori soglia (almeno 2 su 3) è requisito necessario ma non sufficiente al conseguimento dell'abilitazione. La simulazione si basa sui dati IRIS e sugli indicatori bibliometrici alla data indicata e non tiene conto di eventuali periodi di congedo obbligatorio, che in sede di domanda ASN danno diritto a incrementi percentuali dei valori. La simulazione può differire dall'esito di un’eventuale domanda ASN sia per errori di catalogazione e/o dati mancanti in IRIS, sia per la variabilità dei dati bibliometrici nel tempo. Si consideri che Anvur calcola i valori degli indicatori all'ultima data utile per la presentazione delle domande.
La presente simulazione è stata realizzata sulla base delle specifiche raccolte sul tavolo ER del Focus Group IRIS coordinato dall’Università di Modena e Reggio Emilia e delle regole riportate nel DM 589/2018 e allegata Tabella A. Cineca, l’Università di Modena e Reggio Emilia e il Focus Group IRIS non si assumono alcuna responsabilità in merito all’uso che il diretto interessato o terzi faranno della simulazione. Si specifica inoltre che la simulazione contiene calcoli effettuati con dati e algoritmi di pubblico dominio e deve quindi essere considerata come un mero ausilio al calcolo svolgibile manualmente o con strumenti equivalenti.