Projecten per jaar
Abstract
The rate for Higgs (H) bosons production in association with either one (tH) or two (ttH) top quarks is measured in final states containing multiple electrons, muons,
or tau leptons decaying to hadrons and a neutrino, using
proton–proton collisions recorded at a center-of-mass energy
of 13 TeV by the CMS experiment. The analyzed data correspond to an integrated luminosity of 137 fb−1. The analysis is aimed at events that contain H → WW, H → ττ,
or H → ZZ decays and each of the top quark(s) decays
either to lepton+jets or all-jet channels. Sensitivity to signal is maximized by including ten signatures in the analysis,
depending on the lepton multiplicity. The separation among
tH, ttH, and the backgrounds is enhanced through machinelearning techniques and matrix-element methods. The measured production rates for the ttH and tH signals correspond
to 0.92±0.19 (stat)+0.17 −0.13 (syst) and 5.7±2.7 (stat)±3.0 (syst)
of their respective standard model (SM) expectations. The
corresponding observed (expected) significance amounts to
4.7 (5.2) standard deviations for ttH, and to 1.4 (0.3) for tH
production. Assuming that the Higgs boson coupling to the
tau lepton is equal in strength to its expectation in the SM, the
coupling yt of the Higgs boson to the top quark divided by
its SM expectation, κt = yt/ySM
t , is constrained to be within
−0.9 < κt < −0.7 or 0.7 < κt < 1.1, at 95% confidence
level. This result is the most sensitive measurement of the
ttH production rate to date.
or tau leptons decaying to hadrons and a neutrino, using
proton–proton collisions recorded at a center-of-mass energy
of 13 TeV by the CMS experiment. The analyzed data correspond to an integrated luminosity of 137 fb−1. The analysis is aimed at events that contain H → WW, H → ττ,
or H → ZZ decays and each of the top quark(s) decays
either to lepton+jets or all-jet channels. Sensitivity to signal is maximized by including ten signatures in the analysis,
depending on the lepton multiplicity. The separation among
tH, ttH, and the backgrounds is enhanced through machinelearning techniques and matrix-element methods. The measured production rates for the ttH and tH signals correspond
to 0.92±0.19 (stat)+0.17 −0.13 (syst) and 5.7±2.7 (stat)±3.0 (syst)
of their respective standard model (SM) expectations. The
corresponding observed (expected) significance amounts to
4.7 (5.2) standard deviations for ttH, and to 1.4 (0.3) for tH
production. Assuming that the Higgs boson coupling to the
tau lepton is equal in strength to its expectation in the SM, the
coupling yt of the Higgs boson to the top quark divided by
its SM expectation, κt = yt/ySM
t , is constrained to be within
−0.9 < κt < −0.7 or 0.7 < κt < 1.1, at 95% confidence
level. This result is the most sensitive measurement of the
ttH production rate to date.
| Datum van beschikbaarheid | 11 mrt. 2022 |
|---|---|
| Uitgever | HEPData |
Format
- Format
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EU674: Innoveren voor duurzame versnellende systemen
D'Hondt, J., Tytgat, M. & D'Hondt, J.
1/03/24 → 29/02/28
Project: Fundamenteel
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iBOF/23/074: Ontsluiten van de charm-Higgs koppeling bij de LHC
Lowette, S., D'Hondt, J., D'Hondt, J., Lowette, S., Van Mechelen, P. & Dobur, D.
1/01/23 → 31/12/26
Project: Fundamenteel
Onderzoekersoutput
- 1 Article
-
Measurement of the Higgs boson production rate in association with top quarks in final states with electrons, muons, and hadronically decaying tau leptons at s = 13 TeV .
Collaboration, CMS., Blekman, F., Bols, E. S., Chhibra, S. S., D'Hondt, J., De Clercq, J. T., Lontkovskyi, D., Lowette, S., Marchesini, I., Moortgat, S., Morton, A., Müller, D., Python, Q., Tavernier, S., Van Doninck, W. & Van Mulders, P., 30 apr. 2021, In: European Physical Journal C - Particles & Fields. 81, 4, 51 blz., 378.Onderzoeksoutput: Article › peer review
Open AccessBestand76 Citaten (Scopus)156 Downloads (Pure)