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Anthony, M. T.; Atkin, R. J.; Bartos, P.; Battaglia, M.; Black, K. M.; Blue, A.; Bozson, A. J.; Broughton, J. H; Bugge, M. K.; Calvente Lopez, S.; Choi, K.; Donadelli, M.; Doria, A.; Duda, D.; Ellert, M.; Freund, W. S.; Gallas, E. J.; Gallus, P.; Gavrilyuk, A.; Ghasemi, S.; Godlewski, J.; Gonski, J. L.; Hanke, P.; Heinrich, L.; Hildebrand, K.; Hunter, R. F. H.; Huston, J.; Javůrek, T.; Jones, R. W. L.; Kawagoe, K.; Kim, Y. K.; Kitali, V.; Klingl, T.; Kourkoumeli-Charalampidi, A.; Kramarenko, V. A.; Krauss, D.; Kroll, J.; Kugel, A.; Kupco, A.; La Rotonda, L.; Laplace, S.; Lau, T. S.; Lo, C. Y.; Lou, X.; Lutz, M. S.; Maeda, J.; Mc Kee, S. P.; McKay, M. A.; Melzer, A.; Meyer, J-P.; Mineev, M.; Moa, T.; Montejo Berlingen, J.; Myagkov, A. G.; Nakahama, Y.; Nitta, T.; Obermann, T.; Oide, H.; Olariu, A.; Oleiro Seabra, L. F.; Olivares Pino, S. A.; Ozcan, V. E.; Plotnikova, E.; Ragusa, F.; Ramirez Morales, A.; Rawling, J. H.; Rimoldi, M.; Sahu, A.; Salnikov, A.; Sbrizzi, A.; Schoeffel, L.; Schune, Ph; Shabalina, E.; Shahinian, J. D.; Sharma, A. S.; Shimizu, S.; Sideras Haddad, E.; Sidiropoulou, O.; Sowden, B. C.; Stelzer-Chilton, O.; Stevenson, T. J.; Strizenec, P.; Strom, D. M.; Styles, N. A.; Thiele, F.; Toth, J.; Valero, A.; Vazeille, F.; Viaux Maira, N.; Vichou, I.; Villaplana Perez, M.; Wagner-Kuhr, J.; Wahrmund, S.; Wang, R.; Wang, S. M.; Werner, M. D.; White, R.; Zaripovas, D. R.; Zhu, Y.; Zibell, A.
The journal of high energy physics, 08/2018, Letnik: 2018, Številka: 8Journal Article
A bstract The efficiency to identify jets containing b -hadrons ( b -jets) is measured using a high purity sample of dileptonic top quark-antiquark pairs ( t t ¯ ) selected from the 36.1 fb −1 of data collected by the ATLAS detector in 2015 and 2016 from proton-proton collisions produced by the Large Hadron Collider at a centre-of-mass energy s = 13 TeV. Two methods are used to extract the efficiency from t t ¯ events, a combinatorial likelihood approach and a tag-and-probe method. A boosted decision tree, not using b -tagging information, is used to select events in which two b -jets are present, which reduces the dominant uncertainty in the modelling of the flavour of the jets. The efficiency is extracted for jets in a transverse momentum range from 20 to 300 GeV, with data-to-simulation scale factors calculated by comparing the efficiency measured using collision data to that predicted by the simulation. The two methods give compatible results, and achieve a similar level of precision, measuring data-to-simulation scale factors close to unity with uncertainties ranging from 2% to 12% depending on the jet transverse momentum.
