Speaker
Mr
Yanhui Ma
(School of Physics，Shandong University)
Description
A search for the decay of a Standard Model Higgs boson into a bb¯ pair when produced in association with a W or Z boson has been performed with the ATLAS detector. Data were collected in proton-proton collisions from Run 2 of the Large Hadron Collider at a centre-of mass energy of 13 TeV, corresponding to an integrated luminosity of 13.2 fb-1. Final states are considered that contain 0, 1 and 2 charged leptons (electrons or muons), targeting the decays:Z → νν, W → lν, and Z → ll. For mH = 125 GeV the ratio of the measured signal strength to the SM expectation is found to be µ = 0.21+0.36 −0.35(stat.) ± 0.36(stat.). This corresponds to an observed significance of 0.42 standard deviations compared with an expected sensitivity of 1.94. The analysis procedure has been validated by measuring the yield of (W/Z)Z with Z → bb¯, where the ratio of the observed yield to that expected in the Standard Model was found to be 0.91 ± 0.17(stat.) +0.32 −0.27(stat.), corresponding to a significance of 3.0 standard deviations compared to an expected significance of 3.2.
Primary author
Mr
Yanhui Ma
(School of Physics，Shandong University)
