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A measurement is presented of the ratio of the inclusive 3-jet cross section to the inclusive 2-jet cross section as a function of the average transverse momentum, ⟨pT1,2⟩, of the two leading jets in the event. The data sample was collected during 2011 at a proton–proton centre-of-mass energy of 7 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 5.0 fb−1. The strong coupling constant at the scale of the Z boson mass is determined to be α S (M Z)=0.1148±0.0014 (exp.)±0.0018 (PDF)±0.0050(theory), by comparing the ratio in the range 0.42<⟨pT1,2⟩<1.39 TeV to the predictions of perturbative QCD at next-to-leading order. This is the first determination of α S (M Z) from measurements at momentum scales beyond 0.6 TeV. The predicted ratio depends only indirectly on the evolution of the parton distribution functions of the proton such that this measurement also serves as a test of the evolution of the strong coupling constant. No deviation from the expected behaviour is observed.
Measurement of the ratio of the inclusive 3-jet cross section to the inclusive 2-jet cross section in pp collisions at √s=7 TeV and first determination of the strong coupling constant in the TeV range
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Kravchenko;J. Lazo Flores;S. Malik;G. R. Snow;J. Dolen;A. Godshalk;I. Iashvili;S. Jain;A. Kharchilava;A. Kumar;S. Rappoccio;Z. Wan;G. Alverson;E. Barberis;D. Baumgartel;M. Chasco;J. Haley;D. Nash;T. Orimoto;D. Trocino;D. Wood;J. Zhang;A. Anastassov;K. A. Hahn;A. Kubik;L. Lusito;N. Mucia;N. Odell;B. Pollack;A. Pozdnyakov;M. Schmitt;S. Stoynev;M. Velasco;S. Won;D. Berry;A. Brinkerhoff;K. M. Chan;M. Hildreth;C. Jessop;D. J. Karmgard;J. Kolb;K. Lannon;W. Luo;S. Lynch;N. Marinelli;D. M. Morse;T. Pearson;M. Planer;R. Ruchti;J. Slaunwhite;N. Valls;M. Wayne;M. Wolf;L. Antonelli;B. Bylsma;L. S. Durkin;C. Hill;R. Hughes;K. Kotov;T. Y. Ling;D. Puigh;M. Rodenburg;G. Smith;C. Vuosalo;G. Williams;B. L. Winer;H. Wolfe;E. Berry;P. Elmer;V. Halyo;P. Hebda;J. Hegeman;A. Hunt;P. Jindal;S. A. Koay;D. L. Pegna;P. Lujan;D. Marlow;T. Medvedeva;M. Mooney;J. Olsen;P. Piroue;X. Quan;A. Raval;H. Saka;D. Stickland;C. Tully;J. S. Werner;S. C. Zenz;A. Zuranski;E. Brownson;A. Lopez;H. Mendez;J. E. Ramirez;E. 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Flanagan;J. Gilmore;T. Kamon;V. Khotilovich;R. Montalvo;I. Osipenkov;Y. Pakhotin;A. Perloff;J. Roe;A. Safonov;T. Sakuma;I. Suarez;A. Tatarinov;D. Toback;N. Akchurin;J. Damgov;C. Dragoiu;P. R. Dudero;C. Jeong;K. Kovitanggoon;S. W. Lee;T. Libeiro;I. Volobouev;E. Appelt;A. G. Delannoy;S. Greene;A. Gurrola;W. Johns;C. Maguire;Y. Mao;A. Melo;M. Sharma;P. Sheldon;B. Snook;S. Tuo;J. Velkovska;M. W. Arenton;S. Boutle;B. Cox;B. Francis;J. Goodell;R. Hirosky;A. Ledovskoy;C. Lin;C. Neu;J. Wood;S. Gollapinni;R. Harr;P. E. Karchin;C. K. Kankanamge;P. Lamichhane;A. Sakharov;M. Anderson;D. A. Belknap;L. Borrello;D. Carlsmith;M. Cepeda;S. Dasu;E. Friis;K. S. Grogg;M. Grothe;R. Hall Wilton;M. Herndon;A. Herve;P. Klabbers;J. Klukas;A. Lanaro;C. Lazaridis;R. Loveless;A. Mohapatra;M. U. Mozer;I. Ojalvo;G. A. Pierro;I. Ross;A. Savin;W. H. Smith;J. Swanson
2013-01-01
Abstract
A measurement is presented of the ratio of the inclusive 3-jet cross section to the inclusive 2-jet cross section as a function of the average transverse momentum, ⟨pT1,2⟩, of the two leading jets in the event. The data sample was collected during 2011 at a proton–proton centre-of-mass energy of 7 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 5.0 fb−1. The strong coupling constant at the scale of the Z boson mass is determined to be α S (M Z)=0.1148±0.0014 (exp.)±0.0018 (PDF)±0.0050(theory), by comparing the ratio in the range 0.42<⟨pT1,2⟩<1.39 TeV to the predictions of perturbative QCD at next-to-leading order. This is the first determination of α S (M Z) from measurements at momentum scales beyond 0.6 TeV. The predicted ratio depends only indirectly on the evolution of the parton distribution functions of the proton such that this measurement also serves as a test of the evolution of the strong coupling constant. No deviation from the expected behaviour is observed.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/581687
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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.