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Using a sample of dilepton top-quark pair ((tt) over bar) candidate events, a study is performed of the production of top-quark pairs together with heavy-flavor (HF) quarks, the sum of (tt) over bar + b + X and (tt) over bar + c + X, collectively referred to as (tt) over bar + HF. The data set used corresponds to an integrated luminosity of 4.7 fb(-1) of proton-proton collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. The presence of additional HF (b or c) quarks in the (tt) over bar sample is inferred by looking for events with at least three b-tagged jets, where two are attributed to the b quarks from the (tt) over bar decays and the third to additional HF production. The dominant background to (tt) over bar + HF in this sample is (tt) over bar + jet events in which a light-flavor jet is misidentified as a heavy-flavor jet. To determine the heavy-and light-flavor content of the additional b-tagged jets, a fit to the vertex mass distribution of b-tagged jets in the sample is performed. The result of the fit shows that 79 +/- 14 (stat) +/- 22 (syst) of the 105 selected extra b-tagged jets originate from HF quarks, 3 standard deviations away from the hypothesis of zero (tt) over bar + HF production. The result for extra HF production is quoted as a ratio (R-HF) of the cross section for (tt) over bar + HF production to the cross section for (tt) over bar production with at least one additional jet. Both cross sections are measured in a fiducial kinematic region within the ATLAS acceptance. R-HF is measured to be [6.2 +/- 1.1(stat) +/- 1.8 (syst)]% for jets with p(T) > 25 GeV and vertical bar eta vertical bar < 2.5, in agreement with the expectations from Monte Carlo generators.
Aad, G., Abajyan, T., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdelalim, A. ., et al. (2014). A study of heavy-flavor quarks produced in association with top-quark pairs at √s = 7 TeV using the ATLAS detector. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 89(7), 1-23 [10.1103/PhysRevD.89.072012].
A study of heavy-flavor quarks produced in association with top-quark pairs at √s = 7 TeV using the ATLAS detector
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Rosselet;V. Rossetti;E. Rossi;L. P. Rossi;M. Rotaru;I. Roth;J. Rothberg;D. Rousseau;C. R. Royon;A. Rozanov;Y. Rozen;X. Ruan;F. Rubbo;I. Rubinskiy;N. Ruckstuhl;V. I. Rud;C. Rudolph;M. S. Rudolph;F. Rühr;A. Ruiz-Martinez;L. Rumyantsev;Z. Rurikova;N. A. Rusakovich;A. Ruschke;J. P. Rutherfoord;N. Ruthmann;P. Ruzicka;Y. F. Ryabov;M. Rybar;G. Rybkin;N. C. Ryder;A. F. Saavedra;A. Saddique;I. Sadeh;H. F-W. Sadrozinski;R. Sadykov;F. Safai Tehrani;H. Sakamoto;G. Salamanna;A. Salamon;M. Saleem;D. Salek;D. Salihagic;A. Salnikov;J. Salt;B. M. Salvachua Ferrando;D. Salvatore;F. Salvatore;A. Salvucci;A. Salzburger;D. Sampsonidis;A. Sanchez;J. Sánchez;V. Sanchez Martinez;H. Sandaker;H. G. Sander;M. P. Sanders;M. Sandhoff;T. Sandoval;C. Sandoval;R. Sandstroem;D. P. C. Sankey;A. Sansoni;C. Santoni;R. Santonico;H. Santos;I. Santoyo Castillo;K. Sapp;J. G. Saraiva;T. Sarangi;E. Sarkisyan-Grinbaum;B. Sarrazin;F. Sarri;G. Sartisohn;O. Sasaki;Y. Sasaki;N. Sasao;I. Satsounkevitch;G. Sauvage;E. Sauvan;J. B. 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Zhu;J. Zhu;Y. Zhu;X. Zhuang;V. Zhuravlov;A. Zibell;D. Zieminska;N. I. Zimin;R. Zimmermann;S. Zimmermann;S. Zimmermann;Z. Zinonos;M. Ziolkowski;R. Zitoun;L. Živković;V. V. Zmouchko;G. Zobernig;A. Zoccoli;M. zur Nedden;V. Zutshi;L. Zwalinski
2014-01-01
Abstract
Using a sample of dilepton top-quark pair ((tt) over bar) candidate events, a study is performed of the production of top-quark pairs together with heavy-flavor (HF) quarks, the sum of (tt) over bar + b + X and (tt) over bar + c + X, collectively referred to as (tt) over bar + HF. The data set used corresponds to an integrated luminosity of 4.7 fb(-1) of proton-proton collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. The presence of additional HF (b or c) quarks in the (tt) over bar sample is inferred by looking for events with at least three b-tagged jets, where two are attributed to the b quarks from the (tt) over bar decays and the third to additional HF production. The dominant background to (tt) over bar + HF in this sample is (tt) over bar + jet events in which a light-flavor jet is misidentified as a heavy-flavor jet. To determine the heavy-and light-flavor content of the additional b-tagged jets, a fit to the vertex mass distribution of b-tagged jets in the sample is performed. The result of the fit shows that 79 +/- 14 (stat) +/- 22 (syst) of the 105 selected extra b-tagged jets originate from HF quarks, 3 standard deviations away from the hypothesis of zero (tt) over bar + HF production. The result for extra HF production is quoted as a ratio (R-HF) of the cross section for (tt) over bar + HF production to the cross section for (tt) over bar production with at least one additional jet. Both cross sections are measured in a fiducial kinematic region within the ATLAS acceptance. R-HF is measured to be [6.2 +/- 1.1(stat) +/- 1.8 (syst)]% for jets with p(T) > 25 GeV and vertical bar eta vertical bar < 2.5, in agreement with the expectations from Monte Carlo generators.
Aad, G., Abajyan, T., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdelalim, A. ., et al. (2014). A study of heavy-flavor quarks produced in association with top-quark pairs at √s = 7 TeV using the ATLAS detector. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 89(7), 1-23 [10.1103/PhysRevD.89.072012].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/140018
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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.
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