@article{3179563,
    title = "Measurement of associated Z plus charm production in proton-proton
collisions at root s=8TeV",
    author = "Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Ambrogi, F. and and Asilar, E. and Bergauer, T. and Brandstetter, J. and Brondolin, E. and and Dragicevic, M. and Eroe, J. and Flechl, M. and Friedl, M. and and Fruehwirth, R. and Ghete, V. M. and Grossmann, J. and Hoermann, N. and and Hrubec, J. and Jeitler, M. and Koenig, A. and Kraetschmer, I. and Liko, and D. and Madlener, T. and Matsushita, T. and Mikulec, I. and Pree, E. and and Rabady, D. and Rad, N. and Rohringer, H. and Schieck, J. and Spanring, and M. and Spitzbart, D. and Strauss, J. and Waltenberger, W. and Wittmann, and J. and Wulz, C. -E. and Zarucki, M. and Chekhovsky, V. and Mossolov, V. and and Gonzalez, J. Suarez and Shumeiko, N. and De Wolf, E. 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    journal = "The European Physical Journal C - Particles and Fields",
    year = "2018",
    volume = "78",
    number = "4",
    publisher = "Springer-Verlag",
    issn = "1434-6044, 1434-6052",
    doi = "10.1140/epjc/s10052-018-5752-x",
    abstract = "A study of the associated production of a Z boson and a charm quark jet
(Z + c), and a comparison to production with a b quark jet (Z + b), in
pp collisions at a centre-of-mass energy of 8 TeV are presented. The
analysis uses a data sample corresponding to an integrated luminosity of
19.7 fb(-1), collected with the CMS detector at the CERN LHC. The Z
boson candidates are identified through their decays into pairs of
electrons or muons. Jets originating from heavy flavour quarks are
identified using semileptonic decays of c or b flavoured hadrons and
hadronic decays of charm hadrons. The measurements are performed in the
kinematic region with two leptons with pT(l) > 20 GeV, vertical bar
eta(l)vertical bar < 2.1, 71 < m(ll) < 111 GeV, and heavy flavour jets
with p(T)(jet) > 25 GeV and vertical bar eta(jet)vertical bar < 2.5. The
Z + c production cross section is measured to be sigma(pp -> Z + c + X)
B(Z -> l(+)l(-)) = 8.8 +/- 0.5 (stat)+/- 0.6 (syst) pb. The ratio of the
Z+c and Z+b production cross sections is measured to be sigma(pp ->
Z+c+X)/sigma (pp -> Z+b+X) = 2.0 +/- 0.2 (stat)+/- 0.2 (syst). The Z+c
production cross section and the cross section ratio are also measured
as a function of the transverse momentum of theZ boson and of the heavy
flavour jet. The measurements are compared with theoretical predictions."
}