Search for dark matter in proton-proton collisions at 8 TeV with missing transverse momentum and vector boson tagged jets

Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Asilar, E. and Filipovic, Nicolas and Bencze, György and Hajdú, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Makovec, Alajos and Molnár, József and Bartók, Márton and Trócsányi, Zoltán and Ujvári, Balázs and Veres, Gábor (2016) Search for dark matter in proton-proton collisions at 8 TeV with missing transverse momentum and vector boson tagged jets. JOURNAL OF HIGH ENERGY PHYSICS (12). ISSN 1126-6708

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Abstract

A search is presented for an excess of events with large missing transverse momen- tum in association with at least one highly energetic jet, in a data sample of proton- proton collisions at a centre-of-mass energy of 8 TeV. The data correspond to an in- tegrated luminosity of 19.7 fb−1 collected by the CMS experiment at the LHC. The results are interpreted using a set of simplified models for the production of dark matter via a scalar, pseudoscalar, vector, or axial vector mediator. Additional sensi- tivity is achieved by tagging events consistent with the jets originating from a hadron- ically decaying vector boson. This search uses jet substructure techniques to identify hadronically decaying vector bosons in both Lorentz-boosted and resolved scenarios. This analysis yields improvements of 80% in terms of excluded signal cross sections with respect to the previous CMS analysis using the same data set. No significant ex- cess with respect to the standard model expectation is observed and limits are placed on the parameter space of the simplified models. Mediator masses between 80 and 400 GeV in the scalar and pseudoscalar models, and up to 1.5 TeV in the vector and axial vector models, are excluded.

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