Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector
Please always quote using this URN: urn:nbn:de:bvb:20-opus-226569
- A search for the associated production of the Higgs boson with a top quark pair (tt (b) over barH) is reported. The search is performed in multilepton final states using a data set corresponding to an integrated luminosity of 36.1 fb(-1) of proton-proton collision data recorded by the ATLAS experiment at a center-of-mass energy root s = 13 TeV at the Large Hadron Collider. Higgs boson decays to WW*, tau tau, and ZZ* are targeted. Seven final states, categorized by the number and flavor of charged-lepton candidates, are examined for the presenceA search for the associated production of the Higgs boson with a top quark pair (tt (b) over barH) is reported. The search is performed in multilepton final states using a data set corresponding to an integrated luminosity of 36.1 fb(-1) of proton-proton collision data recorded by the ATLAS experiment at a center-of-mass energy root s = 13 TeV at the Large Hadron Collider. Higgs boson decays to WW*, tau tau, and ZZ* are targeted. Seven final states, categorized by the number and flavor of charged-lepton candidates, are examined for the presence of the Standard Model Higgs boson with a mass of 125 GeVand a pair of top quarks. An excess of events over the expected background from Standard Model processes is found with an observed significance of 4.1 standard deviations, compared to an expectation of 2.8 standard deviations. The best fit for the (tt (b) over barH) production cross section is sot (tt (b) over barH) = 790(-210)(+230) fb, in agreement with the Standard Model prediction of 507(-50)(+35) fb. The combination of this result with other tt (b) over barH searches from the ATLAS experiment using the Higgs boson decay modes to b (b) over bar, gamma gamma and ZZ* -> 4l, has an observed significance of 4.2 standard deviations, compared to an expectation of 3.8 standard deviations. This provides evidence for the tt (b) over barH production mode.…
| URN: | urn:nbn:de:bvb:20-opus-226569 |
|---|---|
| Document Type: | Journal article |
| Faculties: | Fakultät für Physik und Astronomie / Physikalisches Institut |
| Language: | English |
| Parent Title (English): | Physical Review D |
| Year of Completion: | 2018 |
| Volume: | 97 |
| Article Number: | 072003 |
| Pagenumber: | 1-44 |
| Source: | Phys. Rev. D 97, 072003, 2018. doi:10.1103/PhysRevD.97.072003 |
| DOI: | https://doi.org/10.1103/PhysRevD.97.072003 |
| Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
| Tag: | 8 TEV; Higgs bosons; Monte-Carlo; Parton distributions; Production cross-section; Root s=7; Top quark; decay; model; pp collisions; search; spontaneous symmetry breaking; symmetries |
| Release Date: | 2023/10/24 |
| Creating Corporation: | The ATLAS Collaboration |
| Licence (German): |  CC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International |