The associated production of a Higgs boson with a W or Z boson decaying into leptons and where the Higgs boson decays to a bb̅ pair is measured in the high vector-boson transverse momentum regime, above 250 GeV, with the ATLAS detector. The analysed data, corresponding to an integrated luminosity of 139 fb-1, were collected in proton-proton collisions at the Large Hadron Collider between 2015 and 2018 at a centre-of-mass energy of √s = 13 TeV. The measured signal strength, defined as the ratio of the measured signal yield to that predicted by the Standard Model, is 0.72+0.39-0.36 corresponding to an observed (expected) significance of 2.1 (2.7) standard deviations. Cross-sections of associated production of a Higgs boson decaying into b quark pairs with a W or Z gauge boson, decaying into leptons, are measured in two exclusive transverse momentum regions, 250-400 GeV and above 400 GeV, and interpreted as constraints on anomalous couplings in the framework of a Standard Model effective field theory.
|Number of pages||28|
|Journal||Phys. Lett. B|
|Early online date||17 Mar 2021|
|Publication status||Published - 10 May 2021|
Bibliographical note49 pages in total, author list starting page 33, 7 figures, 8 tables, to be submitted to Phys. Lett. B. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGGS-2018-52. The results presented in this paper including the correlation matrix have been inserted in HEPdata with the following record: https://www.hepdata.net/record/94801