Abstract
A search for heavy resonances decaying into a $W$ or $Z$ boson and a Higgs boson produced in proton$-$proton collisions at the Large Hadron Collider at $\sqrt{s} = 13$ TeV is presented. The analysis utilizes the dominant $W \to q \bar{q}^\prime$ or $Z \to q \bar{q}$ and $H \to b \bar{b}$ decays with substructure techniques applied to large-radius jets. A sample corresponding to an integrated luminosity of 139 fb$^{-1}$ collected with the ATLAS detector is analyzed and no significant excess of data is observed over the background prediction. The results are interpreted in the context of the Heavy Vector Triplet model with spin-1 $W^\prime$ and $Z^\prime$ bosons. Upper limits on the cross section are set for resonances with mass between 1.5 and 5.0 TeV, ranging from 6.8 to 0.53 fb for $W^\prime \to WH$ and from 8.7 to 0.53 fb for $Z^\prime \to ZH$ at the 95 % confidence level.
Highlights
The search for physics beyond the Standard Model (SM) is a major focus of the physics program at theLarge Hadron Collider (LHC)
The results presented in this article differ from those previously published by ATLAS in the qqbb channel [15] thanks to the following improvements
The integrated luminosity has increased by a factor of nearly four, an improved clustering algorithm combining measurements from the calorimeter and tracking systems is used to reconstruct V- and H-candidate jets, the b-tagging procedure used to identify H-candidate jets is performed on track jets with a pT-dependent radius that allows double b-tagging of H-candidate jets up to considerably higher pT values, and the Higgs-candidate selection has been reoptimized with increased sensitivity
Summary
The search for physics beyond the Standard Model (SM) is a major focus of the physics program at the. The results of the search are interpreted in the context of the heavy vector triplet (HVT) model [9], which is a simplified model providing a broad phenomenological framework for heavy resonances coupling to SM fermions and bosons. In this model, W0 and Z0 vector bosons interact with quarks and the Higgs field with coupling strength of gq and gH, respectively.. For Z0 bosons, the strongest lower limit on the mass is set by ATLAS in the combination of the ννbb and llbb channels [12] with a value of 2.83 TeV at the 95% C.L. in HVT model B. The integrated luminosity has increased by a factor of nearly four, an improved clustering algorithm combining measurements from the calorimeter and tracking systems is used to reconstruct V- and H-candidate jets, the b-tagging procedure used to identify H-candidate jets is performed on track jets with a pT-dependent radius that allows double b-tagging of H-candidate jets up to considerably higher pT values, and the Higgs-candidate selection has been reoptimized with increased sensitivity
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