@article{3166319,
    title = "Search for the production of dark matter in association with top-quark
pairs in the single-lepton final state in proton-proton collisions at
root s=8 TeV",
    author = "Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and and Bergauer, T. and Dragicevic, M. and Eroe, J. and Friedl, M. and and Fruehwirth, R. and Ghete, V. M. and Hartl, C. and Hoermann, N. and and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and Knuenz, V. and and Krammer, M. and Kraetschmer, I. and Liko, D. and Mikulec, I. and Rabady, and D. and Rahbaran, B. and Rohringer, H. and Schoefbeck, R. and Strauss, J. and and Treberer-Treberspurg, W. and Waltenberger, W. and Wulz, C. -E. and and Mossolov, V. and Shumeiko, N. and Gonzalez, J. Suarez and Alderweireldt, and S. and Bansal, S. and Cornelis, T. and De Wolf, E. A. and Janssen, X. and and Knutsson, A. and Lauwers, J. and Luyckx, S. and Ochesanu, S. and and Rougny, R. and Van De Klundert, M. and Van Haevermaet, H. and Van and Mechelen, P. and Van Remortel, N. and Van Spilbeeck, A. and Blekman, F. and and Blyweert, S. and D'Hondt, J. and Daci, N. and Heracleous, N. and and Keaveney, J. and Lowette, S. and Maes, M. and Olbrechts, A. and Python, and Q. and Strom, D. and Tavernier, S. and Van Doninck, W. and Van Mulders, and P. and Van Onsem, G. P. and Villella, I. and Caillol, C. and Clerbaux, and B. and De Lentdecker, G. and Dobur, D. and Favart, L. and Gay, A. P. R. and and Grebenyuk, A. and Leonard, A. and Mohammadi, A. and Pernie, L. and and Randle-Conde, A. and Reis, T. and Seva, T. and Thomas, L. and Velde, C. and Vander and Vanlaer, P. and Wang, J. and Zenoni, F. and Adler, V. and and Beernaert, K. and Benucci, L. and Cimmino, A. and Costantini, S. and and Crucy, S. and Fagot, A. and Garcia, G. and Mccartin, J. and Rios, A. A. and Ocampo and Poyraz, D. and Ryckbosch, D. and Diblen, S. Salva and and Sigamani, M. and Strobbe, N. and Thyssen, F. and Tytgat, M. and Yazgan, and E. and Zaganidis, N. and Basegmez, S. and Beluffi, C. and Bruno, G. and and Castello, R. and Caudron, A. and Ceard, L. and Da Silveira, G. G. and and Delaere, C. and du Pree, T. and Favart, D. and Forthomme, L. and and Giammanco, A. and Hollar, J. and Jafari, A. and Jez, P. and Komm, M. and and Lemaitre, V. and Nuttens, C. and Pagano, D. and Perrini, L. and Pin, A. and and Piotrzkowski, K. and Popov, A. and Quertenmont, L. and Selvaggi, M. and and Marono, M. Vidal and Garcia, J. M. Vizan and Beliy, N. and Caebergs, and T. and Daubie, E. and Hammad, G. H. and Alda Junior, W. L. and Alves, G. and A. and Brito, L. and Correa Martins Junior, M. and Dos Reis Martins, T. and and Molina, J. and Mora Herrera, C. and Pol, M. E. and Rebello Teles, P. and and Carvalho, W. and Chinellato, J. and Custodio, A. and Da Costa, E. 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    journal = "Journal of High Energy Physics",
    year = "2015",
    number = "6",
    publisher = "Springer-Verlag",
    issn = "1126-6708, 1029-8479",
    doi = "10.1007/JHEP06(2015)121",
    keywords = "Hadron-Hadron Scattering; Beyond Standard Model",
    abstract = "A search is presented for particle dark matter produced in association
with a pair of top quarks in pp collisions at a centre-of-mass energy of
root s = 8TeV. The data were collected with the CMS detector at the LHC
and correspond to an integrated luminosity of 19.7 fb(-1). This search
requires the presence of one lepton, multiple jets, and large missing
transverse energy. No excess of events is found above the SM
expectation, and upper limits are derived on the production cross
section. Interpreting the findings in the context of a scalar contact
interaction between fermionic dark matter particles and top quarks,
lower limits on the interaction scale are set. These limits are also
interpreted in terms of the dark matter-nucleon scattering cross
sections for the spin-independent scalar operator and they complement
direct searches for dark matter particles in the low mass region."
}