Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at $ \sqrt{s}=8 $ TeV
are reported from a search for the top squark $ {\tilde{\mathrm{t}}}_1 $ , the lighter of the two supersymmetric partners of the top quark. The data sample corresponds to 19.7 fb$^{−1}$ of proton-proton collisions at $ \sqrt{s}=8 $ TeV collected with the CMS detector at the LHC. The search targets $ {\tilde{\mathrm{t}}}_1\to \mathrm{b}{\tilde{\chi}}_1^{\pm } $ and $ {\tilde{\mathrm{t}}}_1\to {\mathrm{t}}^{\left(\ast \right)}{\tilde{\chi}}_1^0 $ decay modes, where $ {\tilde{\chi}}_1^{\pm } $ and $ {\tilde{\chi}}_1^0 $ are the lightest chargino and neutralino, respectively. The reconstructed final state consists of jets, b jets, missing transverse energy, and either one or two leptons. Leading backgrounds are determined from data. No significant excess in data is observed above the expectation from standard model processes. The results exclude a region of the two-dimensional plane of possible $ {\tilde{\mathrm{t}}}_1 $ and $ {\tilde{\chi}}_1^0 $ masses. The highest excluded $ {\tilde{\mathrm{t}}}_1 $ and $ {\tilde{\chi}}_1^0 $ masses are about 700 GeV and 250 GeV, respectively.
arXiv_1602.03169.pdf
openaccess
2.38 MB
Adobe PDF
a41a7af5c093f21ba33a43c8842faea7
scoap3-fulltext.pdf
openaccess
284.95 KB
Adobe PDF
3c7481160ef6cd3aabba0d0729f5bd6c