Higgs boson production cross-section measurements and their EFT interpretation in the $$4\ell $$
- PDF / 3,848,254 Bytes
- 54 Pages / 595.276 x 790.866 pts Page_size
- 86 Downloads / 227 Views
Regular Article - Experimental Physics
Higgs boson production cross-section measurements and their √ EFT interpretation in the 4 decay channel at s =13 TeV with the ATLAS detector ATLAS Collaboration CERN, 1211 Geneva 23, Switzerland Received: 8 April 2020 / Accepted: 9 July 2020 © CERN for the benefit of the ATLAS collaboration 2020
Abstract Higgs boson properties are studied in the fourlepton decay channel (where lepton = e, μ) using 139 fb−1 √ of proton–proton collision data recorded at s =13 TeV by the ATLAS experiment at the Large Hadron Collider. The inclusive cross-section times branching ratio for H → Z Z ∗ decay is measured to be 1.34 ± 0.12 pb for a Higgs boson with absolute rapidity below 2.5, in good agreement with the Standard Model prediction of 1.33 ± 0.08 pb. Crosssections times branching ratio are measured for the main Higgs boson production modes in several exclusive phasespace regions. The measurements are interpreted in terms of coupling modifiers and of the tensor structure of Higgs boson interactions using an effective field theory approach. Exclusion limits are set on the CP-even and CP-odd ‘beyond the Standard Model’ couplings of the Higgs boson to vector bosons, gluons and top quarks.
6.2 Background processes with non-prompt leptons Systematic uncertainties . . . . . . . . . . . . . . . 7.1 Experimental uncertainties . . . . . . . . . . . 7.2 Theoretical uncertainties . . . . . . . . . . . . 8 Measurement of the Higgs boson production mode cross-sections . . . . . . . . . . . . . . . . . . . . . 8.1 Observed data . . . . . . . . . . . . . . . . . . 8.2 Measurement of simplified template cross-sections 9 Constraints on the Higgs boson couplings in the κframework . . . . . . . . . . . . . . . . . . . . . . . 10 Constraints on the tensor coupling structure in the EFT approach . . . . . . . . . . . . . . . . . . . . . 10.1 EFT signal model . . . . . . . . . . . . . . . . 10.2 EFT interpretation results . . . . . . . . . . . . 11 Conclusion . . . . . . . . . . . . . . . . . . . . . . References . . . . . . . . . . . . . . . . . . . . . . . . . 7
Contents 1 Introduction 1
2 3 4
5
6
Introduction . . . . . . . . . . . . . . . . . . . . . 1.1 Simplified template cross-sections . . . . . . 1.2 Higgs boson couplings in the κ-framework . . 1.3 Tensor structure of Higgs boson couplings in the effective field theory approach . . . . . . ATLAS detector . . . . . . . . . . . . . . . . . . . Data set and event simulation . . . . . . . . . . . . Event selection . . . . . . . . . . . . . . . . . . . 4.1 Event reconstruction . . . . . . . . . . . . . 4.2 Selection of the Higgs boson candidates . . . Event categorisation and production mode discrimination . . . . . . . . . . . . . . . . . . . . . . . . 5.1 Event categorisation . . . . . . . . . . . . . . 5.2 Multivariate production mode discriminants . Background contributions . . . . . . . . . . . . . . 6.1 Background processes with prompt leptons .
e-mail:
[email protected]
0123456789().: V,-vol
. . . . . . . . . . . . . .
The observ
Data Loading...
