Abstract
A search for new resonances decaying into jets containing b-hadrons in $pp$ collisions with the ATLAS detector at the LHC is presented in the dijet mass range from 0.57 TeV to 7 TeV. The dataset corresponds to an integrated luminosity of up to 36.1 fb$^{-1}$ collected in 2015 and 2016 at $\sqrt{s} = 13$ TeV. No evidence of a significant excess of events above the smooth background shape is found. Upper cross-section limits and lower limits on the corresponding signal mass parameters for several types of signal hypotheses are provided at 95% CL. In addition, 95% CL upper limits are set on the cross-sections for new processes that would produce Gaussian-shaped signals in the di-b-jet mass distributions.
Highlights
New heavy particles that couple to quarks or gluons are predicted by several extensions of the Standard Model (SM) [1,2,3,4,5]
The new particles can decay into quarks and gluons, that hadronize and form jets that are observable in the detector
The data set for the high dijet-mass region mjj > 1.2 TeV was recorded by selecting events from an inclusive jet trigger requiring at least one jet with a transverse momentum pT above 380 GeV, and corresponds to an integrated luminosity of 3.2 fb−1 in 2015 and 32.9 fb−1 in 2016
Summary
New heavy particles that couple to quarks or gluons are predicted by several extensions of the Standard Model (SM) [1,2,3,4,5]. The sensitivity can be improved even for resonances without an enhanced bbdecay mode, like many Z0 models described below, if the search suffers from non-qqbackgrounds, in particular gluon radiation. Such searches have been performed by CDF covering the mass range 250–750 GeV [19], by CMS covering 0.3–4 TeV [20,21] and by ATLAS covering 1–5 TeV [22]. These limits assume, after applying the selection, a narrow-resonance signal shape with an intrinsic width that can be safely truncated or neglected, so that the reconstructed mass distribution reflects the experimental resolution and can be approximated by a Gaussian distribution [24]
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