Search for dark matter, extra dimensions, and unparticles in monojet events in proton-proton collisions at sqrt(s) = 8 TeV

• Published in: The European physical journal. C, Particles and fields Particles and fields, 2015-05, Vol.75 (5)
• Main Authors: Khachatryan, V., Besancon, M., Couderc, F., Dejardin, M., Denegri, D., Fabbro, B., Faure, J.L., Favaro, C., Ferri, F., Ganjour, S., Givernaud, A., Gras, P., Hamel de Monchenault, G., Jarry, P., Locci, E., Malcles, J., Nayak, A., Rander, J., Rosowsky, A., Titov, M., Baffioni, S., Beaudette, F., Busson, P., Charlot, C., Dahms, T., Dalchenko, M., Dobrzynski, L., Filipovic, N., Florent, A., Granier de Cassagnac, R., Mastrolorenzo, L., Miné, P., Mironov, C., Naranjo, I.N., Nguyen, M., Ochando, C., Paganini, P., Salerno, R., Sauvan, J.B., Sirois, Y., Veelken, C., Yilmaz, Y., Zabi, A., Agram, J.-L., Andrea, J., Aubin, A., Bloch, D., Brom, J.-M., Chabert, E.C., Collard, C., Conte, E., Fontaine, J.-C., Gelé, D., Goerlach, U., Goetzmann, C., Le Bihan, A.-C., van Hove, P., Gadrat, S., Beauceron, S., Beaupere, N., Boudoul, G., Brochet, S., Carrillo Montoya, C.A., Chasserat, J., Chierici, R., Contardo, D., Depasse, P., El Mamouni, H., Fan, J., Fay, J., Gascon, S., Gouzevitch, M., Ille, B., Kurca, T., Lethuillier, M., Mirabito, L., Perries, S., Ruiz Alvarez, J.D., Sabes, D., Sgandurra, L., Sordini, V., Vander Donckt, M., Verdier, P., Viret, S., Xiao, H.
• Format: Article
• Language: English
• Subjects: High Energy Physics - Experiment; Physics; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
• ISSN: 1434-6044; 1434-6052; 1434-6052
• DOI: 10.1140/epjc/s10052-015-3451-4

Results are presented from a search for particle dark matter (DM), extra dimensions, and unparticles using events containing a jet and an imbalance in transverse momentum. The data were collected by the CMS detector in proton-proton collisions at the LHC and correspond to an integrated luminosity of 19.7 inverse femtobarns at a centre-of-mass energy of 8 TeV. The number of observed events is found to be consistent with the standard model prediction. Limits are placed on the DM-nucleon scattering cross section as a function of the DM particle mass for spin-dependent and spin-independent interactions. Limits are also placed on the scale parameter M[D] in the ADD model of large extra dimensions, and on the unparticle model parameter Lambda[U]. The constraints on ADD models and unparticles are the most stringent limits in this channel and those on the DM-nucleon scattering cross section are an improvement over previous collider results.