Abstract
A search for new physics is performed using events that contain one or more jets, no isolated leptons, and a large transverse momentum imbalance, as measured through the MT2 variable, which is an extension of the transverse mass in events with two invisible particles. The results are based on a sample of proton-proton collisions collected at a center-of-mass energy of 13 TeV with the CMS detector at the LHC, and that corresponds to an integrated luminosity of 2.3 inverse femtobarns. The observed event yields in the data are consistent with predictions for the standard model backgrounds. The results are interpreted using simplified models of supersymmetry and are expressed in terms of limits on the masses of potential new colored particles. Assuming that the lightest neutralino is stable and has a mass less than about 500 GeV, gluino masses up to 1550-1750 GeV are excluded at 95% confidence level, depending on the gluino decay mechanism. For the scenario of direct production of squark-antisquark pairs, top squarks with masses up to 800 GeV are excluded, assuming a 100% branching fraction for the decay to a top quark and neutralino. Similarly, bottom squark masses are excluded up to 880 GeV, and masses of light-flavor squarks are excluded up to 600-1260 GeV, depending on the degree of degeneracy of the squark masses.
Highlights
A search for new physics is performed using events that contain one or more jets, no isolated leptons, and a large transverse momentum imbalance, as measured through the MT2. The uncertainty in kMC (MT2) variable, which is an extension of the transverse mass in events with two invisible particles
In this paper we present results of a search for new physics in events with jets and significant transverse momentum imbalance, as characterized by the “stransverse mass” MT2, a kinematic variable that was first proposed for use in SUSY searches in refs. [18, 19] and used in several Run 1 searches [13, 20]
We identify electrons having pT > 10 GeV by loose requirements on the shape of these energy deposits, on the ratio of energy in associated hadron and electromagnetic calorimeter cells (H/E), on the geometric matching between the energy deposits and the associated track, and on the consistency between the energy reconstructed from calorimeter deposits and the momentum measured in the tracker
Summary
The central feature of the CMS apparatus is a superconducting solenoid, 13 m in length and 6 m in diameter, which provides an axial magnetic field of 3.8 T. Charged-particle trajectories are measured with silicon pixel and strip trackers, covering 0 ≤ φ < 2π in azimuth and |η| < 2.5 in pseudorapidity, where η ≡ − ln[tan(θ/2)] and θ is the polar angle of the trajectory of the particle with respect to the beam direction. The transverse momentum, the component of the momentum p in the plane orthogonal to the beam, is defined in terms of the polar angle as pT = p sin θ. The detector is nearly hermetic, allowing momentum imbalance measurements in the plane transverse to the beam direction. A more detailed description of the CMS detector is available in ref. [26]
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