The observation of Higgs boson production in association with a top quark-antiquark pair is reported, based on a combined analysis of proton-proton collision data at center-of-mass energies of root s = 7, 8, and 13 TeV, corresponding to integrated luminosities of up to 5.1, 19.7, and 35.9 fb(-1), respectively. The data were collected with the CMS detector at the CERN LHC. The results of statistically independent searches for Higgs bosons produced in conjunction with a top quark-antiquark pair and decaying to pairs of W bosons, Z bosons, photons, tau leptons, or bottom quark jets are combined to maximize sensitivity. An excess of events is observed, with a significance of 5.2 standard deviations, over the expectation from the background-only hypothesis. The corresponding expected significance from the standard model for a Higgs boson mass of 125.09 GeV is 4.2 standard deviations. The combined best fit signal strength normalized to the standard model prediction is 1.26(-0.26)(+0.31).

Observation of (tt)over-barH Production / Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., Brandstetter, J., Dragicevic, M., Eroe, J., Del Valle, A.E., Flechl, M., Fruehwirth, R., Ghete, V.M., Hrubec, J., Jeitler, M., Krammer, N., Kraetschmer, I., Liko, D., Madlener, T., Mikulec, I., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 120:23(2018). [10.1103/PhysRevLett.120.231801]

Observation of (tt)over-barH Production

Creanza, D.;De Filippis, N.;Di Florio, A.;Iaselli, G.;Maggi, G.;Pugliese, G.;
2018

Abstract

The observation of Higgs boson production in association with a top quark-antiquark pair is reported, based on a combined analysis of proton-proton collision data at center-of-mass energies of root s = 7, 8, and 13 TeV, corresponding to integrated luminosities of up to 5.1, 19.7, and 35.9 fb(-1), respectively. The data were collected with the CMS detector at the CERN LHC. The results of statistically independent searches for Higgs bosons produced in conjunction with a top quark-antiquark pair and decaying to pairs of W bosons, Z bosons, photons, tau leptons, or bottom quark jets are combined to maximize sensitivity. An excess of events is observed, with a significance of 5.2 standard deviations, over the expectation from the background-only hypothesis. The corresponding expected significance from the standard model for a Higgs boson mass of 125.09 GeV is 4.2 standard deviations. The combined best fit signal strength normalized to the standard model prediction is 1.26(-0.26)(+0.31).
2018
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.231801
Observation of (tt)over-barH Production / Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., Brandstetter, J., Dragicevic, M., Eroe, J., Del Valle, A.E., Flechl, M., Fruehwirth, R., Ghete, V.M., Hrubec, J., Jeitler, M., Krammer, N., Kraetschmer, I., Liko, D., Madlener, T., Mikulec, I., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 120:23(2018). [10.1103/PhysRevLett.120.231801]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/138946
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