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A measurement of the cross section for the production of topquark–antiquark pairs(tt) inassociation with a vector boson V (W or Z) in proton-proton collisions at sqrt(s)=8 TeV is presented. The results are based on a dataset corresponding to an integrated luminosity of 19.5 fb−1 recorded with the CMS detector at the LHC. The measurement is
performed in three leptonic (e and μ) channels: a same-
sign dilepton analysis targeting ttW events, and trilepton and
four-lepton analyses designed for ttZ events. In the same-
sign dilepton channel, the ttW cross section is measured as
σttW=170+90−80(stat)±70(syst)fb, corresponding to a significance of 1.6 standard deviations over the background-only hypothesis. Combining the trilepton and four-leptonchannels, a direct measurement of the ttZ cross section,
σttZ=200+80−70(stat)+40−30(syst)fb−1, is obtained with a significance of 3.1 standard deviations. The measured cross sections are compatible with standard model predictions within their experimental uncertainties. The inclusive ttV process is
observed with a significance of 3.7 standard deviations from
the combination of all three leptonic channels.
V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, et al. (2014). Measurement of top quark–antiquark pair production in association with a W or Z boson in pp collisions at sqrt(s) = 8 TeV. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 74, 3060-3086 [10.1140/epjc/s10052-014-3060-7].
Measurement of top quark–antiquark pair production in association with a W or Z boson in pp collisions at sqrt(s) = 8 TeV
V. Khachatryan;A. M. Sirunyan;A. Tumasyan;W. Adam;T. Bergauer;M. Dragicevic;J. Erö;C. Fabjan;M. Friedl;R. Frühwirth;V. M. Ghete;C. Hartl;N. Hörmann;J. Hrubec;M. Jeitler;W. Kiesenhofer;V. Knünz;M. Krammer;I. Krätschmer;D. Liko;I. Mikulec;D. Rabady;B. Rahbaran;H. Rohringer;R. Schöfbeck;J. Strauss;A. Taurok;W. Treberer Treberspurg;W. Waltenberger;C. E. Wulz;V. Mossolov;N. Shumeiko;J. Suarez Gonzalez;S. Alderweireldt;M. Bansal;S. Bansal;T. Cornelis;E. A. De Wolf;X. Janssen;A. Knutsson;S. Luyckx;S. Ochesanu;B. Roland;R. Rougny;M. Van De Klundert;H. Van Haevermaet;P. Van Mechelen;N. Van Remortel;A. Van Spilbeeck;F. Blekman;S. Blyweert;J. D’Hondt;N. Daci;N. Heracleous;J. Keaveney;S. Lowette;M. Maes;A. Olbrechts;Q. Python;D. Strom;S. Tavernier;W. Van Doninck;P. Van Mulders;G. P. Van Onsem;I. Villella;C. Caillol;B. Clerbaux;G. De Lentdecker;D. Dobur;L. Favart;A. P. R. Gay;A. Grebenyuk;A. Léonard;A. Mohammadi;L. Perniè;T. Reis;T. Seva;L. Thomas;C. Vander Velde;P. Vanlaer;J. Wang;V. Adler;K. 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V. Tran;L. Uplegger;E. W. Vaandering;R. Vidal;A. Whitbeck;J. Whitmore;F. Yang;D. Acosta;P. Avery;D. Bourilkov;M. Carver;T. Cheng;D. Curry;S. Das;M. De Gruttola;G. P. Di Giovanni;R. D. Field;M. Fisher;I. K. Furic;J. Hugon;J. Konigsberg;A. Korytov;T. Kypreos;J. F. Low;K. Matchev;P. Milenovic;G. Mitselmakher;L. Muniz;A. Rinkevicius;L. Shchutska;M. Snowball;J. Yelton;M. Zakaria;S. Hewamanage;S. Linn;P. Markowitz;G. Martinez;J. L. Rodriguez;T. Adams;A. Askew;J. Bochenek;B. Diamond;J. Haas;S. Hagopian;V. Hagopian;K. F. Johnson;H. Prosper;V. Veeraraghavan;M. Weinberg;M. M. Baarmand;M. Hohlmann;H. Kalakhety;F. Yumiceva;M. R. Adams;L. Apanasevich;V. E. Bazterra;D. Berry;R. R. Betts;I. Bucinskaite;R. Cavanaugh;O. Evdokimov;L. Gauthier;C. E. Gerber;D. J. Hofman;S. Khalatyan;P. Kurt;D. H. Moon;C. O’Brien;C. Silkworth;P. Turner;N. Varelas;E. A. Albayrak;B. Bilki;W. Clarida;K. Dilsiz;F. Duru;M. Haytmyradov;J. P. Merlo;H. Mermerkaya;A. Mestvirishvili;A. Moeller;J. Nachtman;H. Ogul;Y. Onel;F. Ozok;A. 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Contreras Campana;E. Contreras Campana;D. Duggan;D. Ferencek;Y. Gershtein;R. Gray;E. Halkiadakis;D. Hidas;A. Lath;S. Panwalkar;M. Park;R. Patel;S. Salur;S. Schnetzer;S. Somalwar;R. Stone;S. Thomas;P. Thomassen;M. Walker;K. Rose;S. Spanier;A. York;O. Bouhali;R. Eusebi;W. Flanagan;J. Gilmore;T. Kamon;V. Khotilovich;V. Krutelyov;R. Montalvo;I. Osipenkov;Y. Pakhotin;A. Perloff;J. Roe;A. Rose;A. Safonov;T. Sakuma;I. Suarez;A. Tatarinov;N. Akchurin;C. Cowden;J. Damgov;C. Dragoiu;P. R. Dudero;J. Faulkner;K. Kovitanggoon;S. Kunori;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;H. Li;C. Lin;C. Neu;J. Wood;C. Clarke;R. Harr;P. E. Karchin;C. Kottachchi Kankanamge Don;P. Lamichhane;J. Sturdy;D. A. Belknap;D. Carlsmith;M. Cepeda;S. Dasu;L. Dodd;S. Duric;E. Friis;R. Hall Wilton;M. Herndon;A. Hervé;P. Klabbers;A. Lanaro;C. Lazaridis;A. Levine;R. Loveless;A. Mohapatra;I. Ojalvo;T. Perry;G. A. Pierro;G. Polese;I. Ross;T. Sarangi;A. Savin;W. H. Smith;C. Vuosalo;N. Woods;[Authorinst]The CMS Collaboration
2014
Abstract
A measurement of the cross section for the production of topquark–antiquark pairs(tt) inassociation with a vector boson V (W or Z) in proton-proton collisions at sqrt(s)=8 TeV is presented. The results are based on a dataset corresponding to an integrated luminosity of 19.5 fb−1 recorded with the CMS detector at the LHC. The measurement is
performed in three leptonic (e and μ) channels: a same-
sign dilepton analysis targeting ttW events, and trilepton and
four-lepton analyses designed for ttZ events. In the same-
sign dilepton channel, the ttW cross section is measured as
σttW=170+90−80(stat)±70(syst)fb, corresponding to a significance of 1.6 standard deviations over the background-only hypothesis. Combining the trilepton and four-leptonchannels, a direct measurement of the ttZ cross section,
σttZ=200+80−70(stat)+40−30(syst)fb−1, is obtained with a significance of 3.1 standard deviations. The measured cross sections are compatible with standard model predictions within their experimental uncertainties. The inclusive ttV process is
observed with a significance of 3.7 standard deviations from
the combination of all three leptonic channels.
V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, et al. (2014). Measurement of top quark–antiquark pair production in association with a W or Z boson in pp collisions at sqrt(s) = 8 TeV. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 74, 3060-3086 [10.1140/epjc/s10052-014-3060-7].
V. Khachatryan;A. M. Sirunyan;A. Tumasyan;W. Adam;T. Bergauer;M. Dragicevic;J. Erö;C. Fabjan;M. Friedl;R. Frühwirth;V. M. Ghete;C. Hartl;N. Hörmann;J....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/375251
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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.