Search for narrow and broad dijet resonances in proton-proton collisions at √s=13 TeV and constraints on dark matter mediators and other new particles
Searches for resonances decaying into pairs of jets are performed using protonproton collision data collected at √ s = 13 TeV corresponding to an integrated luminosity of up to 36 fb−1 . A low-mass search, for resonances with masses between 0.6 and 1.6 TeV, is performed based on events with dij...
| Summary: | Searches for resonances decaying into pairs of jets are performed using protonproton
collision data collected at √
s = 13 TeV corresponding to an integrated luminosity
of up to 36 fb−1
. A low-mass search, for resonances with masses between 0.6 and 1.6 TeV,
is performed based on events with dijets reconstructed at the trigger level from calorimeter
information. A high-mass search, for resonances with masses above 1.6 TeV, is performed
using dijets reconstructed offline with a particle-flow algorithm. The dijet mass spectrum
is well described by a smooth parameterization and no evidence for the production
of new particles is observed. Upper limits at 95% confidence level are reported on the
production cross section for narrow resonances with masses above 0.6 TeV. In the context
of specific models, the limits exclude string resonances with masses below 7.7 TeV,
scalar diquarks below 7.2 TeV, axigluons and colorons below 6.1 TeV, excited quarks below
6.0 TeV, color-octet scalars below 3.4 TeV, W0 bosons below 3.3 TeV, Z0 bosons below
2.7 TeV, Randall-Sundrum gravitons below 1.8 TeV and in the range 1.9 to 2.5 TeV, and
dark matter mediators below 2.6 TeV. The limits on both vector and axial-vector mediators,
in a simplified model of interactions between quarks and dark matter particles, are
presented as functions of dark matter particle mass and coupling to quarks. Searches are
also presented for broad resonances, including for the first time spin-1 resonances with
intrinsic widths as large as 30% of the resonance mass. The broad resonance search improves
and extends the exclusions of a dark matter mediator to larger values of its mass
and coupling to quarks. |
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