Abstract
Abstract A search for new physics is performed using events with isolated same-sign leptons and at least two bottom-quark jets in the final state. Results are based on a sample of proton-proton collisions collected at a center-of-mass energy of 8 TeV with the CMS detector and corresponding to an integrated luminosity of 10.5 fb−1. No excess above the standard model background is observed. Upper limits are set on the number of events from non-standard-model sources and are used to constrain a number of new physics models. Information on acceptance and efficiencies is also provided so that the results can be used to confront an even broader class of new physics models.
Highlights
We have presented results of a search for same-sign dileptons with bottomquark jets using the CMS detector at the LHC, based on a 10.5 fb−1 data sample of pp
In the latter case we have assumed χ−1 → W−χ01
Summary
The central feature of the CMS apparatus is a superconducting solenoid, of 6 m internal diameter, providing a magnetic field of 3.8 T. The CMS experiment uses a right-handed coordinate system, with the origin defined to be the nominal interaction point, the x axis pointing to the center of the LHC ring, the y axis pointing up (perpendicular to the LHC plane), and the z axis pointing in the counterclockwise beam direction. Within the field volume are a silicon pixel and strip tracker, a crystal electromagnetic calorimeter, and a brass-scintillator hadron calorimeter. Muons are measured in gas-ionization detectors embedded in the steel return yoke. Full coverage is provided by the tracker, calorimeters, and the muon detectors within |η| < 2.4. In addition to the barrel and endcap calorimeters up to |η| = 3, CMS has extensive forward calorimetry reaching |η| 5. A more detailed description of the CMS apparatus can be found in ref. [14]
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