@article{3031454,
    title = "First measurement of the cross section for top quark pair production
with additional charm jets using dileptonic final states in pp
collisions at root s=13 TeV",
    author = "Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and and Dragicevic, M. and Del Valle, A. Escalante and Fruehwirth, R. and and Jeitler, M. and Krammer, N. and Lechner, L. and Liko, D. and Mikulec, I. and and Pitters, F. M. and Schieck, J. and Schoefbeck, R. and Spanring, M. and and Templ, S. and Waltenberger, W. and Wulz, C. -E. and Zarucki, M. and and Chekhovsky, V. and Litomin, A. and Makarenko, V. and Darwish, M. . R. and and De Wolf, E. A. and Janssen, X. and Kello, T. and Lelek, A. and and Pieters, M. and Sfar, H. Rejeb and Van Mechelen, P. and Van Putte, S. and and Van Remortel, N. and Blekman, F. and Bols, E. S. and D'Hondt, J. and and De Clercq, J. and Lontkovskyi, D. and Lowette, S. and Marchesini, I. and and Moortgat, S. and Morton, A. and Mueller, D. and Sahasransu, A. R. and and Tavernier, S. and Van Doninck, W. and Van Mulders, P. and Beghin, D. and and Bilin, B. and Clerbaux, B. and De Lentdecker, G. and Dorney, B. and and Favart, L. and Grebenyuk, A. and Kalsi, A. K. and Lee, K. and Makarenko, and I. and Moureaux, L. and Petre, L. and Popov, A. and Postiau, N. and and Starling, E. and Thomas, L. and Velde, C. Vander and Vanlaer, P. and and Vannerom, D. and Wezenbeek, L. and Cornelis, T. and Dobur, D. and and Gruchala, M. and Khvastunov, I and Mestdach, G. and Niedziela, M. and and Roskas, C. and Skovpen, K. and Tytgat, M. and Verbeke, W. and Vermassen, and B. and Vit, M. and Bethani, A. and Bruno, G. and Bury, F. and Caputo, C. and and David, P. and Delaere, C. and Delcourt, M. and Donertas, I. S. and and Giammanco, A. and Lemaitre, V and Mondal, K. and Prisciandaro, J. and and Taliercio, A. and Teklishyn, M. and Vischia, P. and Wertz, S. and and Wuyckens, S. and Alves, G. A. and Hensel, C. and Moraes, A. and Alda and Junior, W. 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H. and and Teague, D. and Trembath-Reichert, S. and Vetens, W. and CMS and Collaboration",
    journal = "PHYSICS LETTERS B",
    year = "2021",
    volume = "820",
    publisher = "Elsevier",
    issn = "0370-2693",
    doi = "10.1016/j.physletb.2021.136565",
    keywords = "CMS; Top quark; Dilepton; Charm quark; Charm-tagging; Heavy-flavour",
    abstract = "The first measurement of the inclusive cross section for top quark pairs
(tt) produced in association with two additional charm jets is
presented. The analysis uses the dileptonic final states of tt events
produced in proton-proton collisions at a centre-of-mass energy of 13
TeV. The data correspond to an integrated luminosity of 41.5 fb-1,
recorded by the CMS experiment at the LHC. A new charm jet
identification algorithm provides input to a neural network that is
trained to distinguish among tt events with two additional charm (ttcc),
bottom (ttbb), and light-flavour or gluon (ttLL) jets. By means of a
template fitting procedure, the inclusive ttcc, ttbb, and ttLL cross
sections are simultaneously measured, together with their ratios to the
inclusive tt + two jets cross section. This provides measurements of the
ttcc and ttbb cross sections of 10.1 +/- 1.2 (stat) +/- 1.4 (syst) pb
and 4.54 +/- 0.35 (stat) +/- 0.56 (syst) pb, respectively, in the full
phase space. The results are compared and found to be consistent with
predictions from two different matrix element generators with
next-to-leading order accuracy in quantum chromodynamics, interfaced
with a parton shower simulation. (c) 2021 The Author(s). Published by
Elsevier B.V. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3."
}