@article{88843f72e98f4ef39953c7f3881da16b,
title = "Measurement of top quark pair production in association with a Z boson in proton-proton collisions at √s = 13 TeV",
abstract = "A measurement of the inclusive cross section of top quark pair production in association with a Z boson using proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC is performed. The data sample corresponds to an integrated luminosity of 77.5 fb−1, collected by the CMS experiment during 2016 and 2017. The measurement is performed using final states containing three or four charged leptons (electrons or muons), and the Z boson is detected through its decay to an oppositely charged lepton pair. The production cross section is measured to be σ(t t ¯ Z) = 0.95 ± 0.05 (stat) ± 0.06 (syst) pb. For the first time, differential cross sections are measured as functions of the transverse momentum of the Z boson and the angular distribution of the negatively charged lepton from the Z boson decay. The most stringent direct limits to date on the anomalous couplings of the top quark to the Z boson are presented, including constraints on the Wilson coefficients in the framework of the standard model effective field theory. [Figure not available: see fulltext.]",
keywords = "Hadron-Hadron scattering (experiments), Top physics",
author = "{The CMS Collaboration} and Sirunyan, {A. M.} and A. Tumasyan and W. Adam and F. Ambrogi and T. Bergauer and J. Brandstetter and M. Dragicevic and J. Er{\"o} and {Escalante Del Valle}, A. and M. Flechl and R. Fr{\"u}hwirth and M. Jeitler and N. Krammer and I. Kr{\"a}tschmer and D. Liko and T. Madlener and I. Mikulec and N. Rad and J. Schieck and R. Sch{\"o}fbeck and M. Spanring and D. Spitzbart and W. Waltenberger and Wulz, {C. E.} and M. Zarucki and V. Drugakov and V. Mossolov and {Suarez Gonzalez}, J. and Darwish, {M. R.} and {De Wolf}, {E. A.} and {Di Croce}, D. and X. Janssen and J. Lauwers and A. Lelek and M. Pieters and {Rejeb Sfar}, H. and {Van Haevermaet}, H. and {Van Mechelen}, P. and {Van Putte}, S. and {Van Remortel}, N. and F. Blekman and Bols, {E. S.} and Chhibra, {S. S.} and J. D{\textquoteright}Hondt and {De Clercq}, J. and D. Lontkovskyi and S. Choi and B. Hong and Park, {S. K.} and J. Yoo",
note = "Funding Information: Acknowledgments We thank C. Thibault for his constant support to our work, C. Viebahn for stimulating discussions, the staff from our rabbit facility for their critical role in the care of recipients and cloned kits, C. Poirier for assistance in embryo transfer, E. Campion for the recovery and fixation of D8 embryos, and C. Young and B. Nicolas for help during the preparation of the manuscript. This work was supported by a grant from the Association Fran{\c c}aise de Lutte contre la Mucoviscidose (AFLM). Publisher Copyright: {\textcopyright} 2020, The Author(s).",
year = "2020",
month = mar,
day = "1",
doi = "10.1007/JHEP03(2020)056",
language = "English",
volume = "2020",
journal = "Journal of High Energy Physics",
issn = "1126-6708",
publisher = "Springer Verlag",
number = "3",
}