Abstract
A search for the exotic decay of the Higgs boson (H) into a b overline{b} resonance plus missing transverse momentum is described. The search is performed with the ATLAS detector at the Large Hadron Collider using 139 fb−1 of pp collisions at sqrt{s} = 13 TeV. The search targets events from ZH production in an NMSSM scenario where H → {overset{sim }{chi}}_2^0{overset{sim }{chi}}_1^0 , with {overset{sim }{chi}}_2^0 → a{overset{sim }{chi}}_1^0 , where a is a light pseudoscalar Higgs boson and {overset{sim }{chi}}_{1,2}^0 are the two lightest neutralinos. The decay of the a boson into a pair of b-quarks results in a peak in the dijet invariant mass distribution. The final-state signature consists of two leptons, two or more jets, at least one of which is identified as originating from a b-quark, and missing transverse momentum. Observations are consistent with Standard Model expectations and upper limits are set on the product of cross section times branching ratio for a three-dimensional scan of the masses of the {overset{sim }{chi}}_2^0 , {overset{sim }{chi}}_1^0 and a boson.
Highlights
Background and statistical modelThe background in the signal region (SR) is primarily composed of Z+HF and tt, with a small contribution from Z plus light-flavour jets (Z+light), single-top and diboson events
The analysis presented in this paper uses 139 fb−1 of pp collisions at collected with the ATLAS detector
Subdominant systematic uncertainties in this analysis include the theoretical uncertainty of the Z+HF mjj shape correction (2%– 3%), the jet energy resolution (1%–3%), the flavour dependence of the jet energy scale (1%–2%), and the statistical uncertainties of the background shape parameters (1%–3%), which arise from the limited number of data events in control region for Z+HF (CRZ) and CRTop
Summary
The ATLAS experiment [30] at the LHC is a multipurpose particle detector with a forwardbackward symmetric cylindrical geometry and a near 4π coverage in solid angle. It consists of an inner tracking detector (ID) surrounded by a thin superconducting solenoid providing. The ATLAS experiment [30] at the LHC is a multipurpose particle detector with a forwardbackward symmetric cylindrical geometry and a near 4π coverage in solid angle.. The ATLAS experiment [30] at the LHC is a multipurpose particle detector with a forwardbackward symmetric cylindrical geometry and a near 4π coverage in solid angle.2 It consists of an inner tracking detector (ID) surrounded by a thin superconducting solenoid providing. A 2 T axial magnetic field, electromagnetic and hadron calorimeters, and a muon spectrometer. The inner tracking detector covers the pseudorapidity range |η| < 2.5. The muon spectrometer surrounds the calorimeters and is based on three large air-core toroidal superconducting magnets with eight coils each. The muon spectrometer includes a system of precision tracking chambers and fast detectors for triggering. An extensive software suite [34] is used for real and simulated data reconstruction and analysis, for operation and in the trigger and data acquisition systems of the experiment
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