Measurements of Higgs boson production and couplings in the four-lepton channel in pp collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector
Metadatos
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American Physical Society
Fecha
2015-01-16Referencia bibliográfica
Aad, G., Abbott, B., Abdallah, J., Khalek, S. A., Aben, R., Abi, B., ... & Abreu, R. (2015). Measurements of Higgs boson production and couplings in the four-lepton channel in p p collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector. Physical Review D, 91(1), 012006. [https://doi.org/10.1103/PhysRevD.91.012006]
Patrocinador
ANPCyT; ICREA; Science & Technology Facilities Council (STFC) PP/D002915/1 PP/E000444/1 ST/K001310/1 ATLAS Upgrades ST/L001209/1 ATLAS Upgrades GRIDPP ST/M000664/1 ST/K001426/1 ATLAS ST/K001264/1 ATLAS ST/I00372X/1 ST/K50208X/1 ST/M002306/1 ATLAS Upgrades 1072662 1082012 ST/J005487/1 ST/L001179/1 PP/E000355/1 ST/M006980/1 ATLAS Upgrades ST/M503575/1 ST/L001179/1 ATLAS Upgrade ST/M001733/1 ST/K001418/1 ST/J501074/1 ST/J00474X/1 ATLAS Upgrades ST/I006056/1 ATLAS Upgrade 1521422 ATLAS ST/K001302/1 ST/M001407/1 ST/K001310/1 LHCb ST/I00372X/1 GRIDPP 1366825 1575161 ST/K001310/1 ST/H00100X/2 ST/L006464/1 1366364 PP/E002846/1 ST/H00100X/1 ST/I006056/1 ATLAS Upgrades ST/J00474X/1 ST/M006980/1 ST/K00137X/1 ST/M001474/1 ST/J005525/1 ST/K001310/1 LHCb Upgrades ST/K001248/1 1201187 ST/K001388/1 ST/M001504/1 ST/K001396/1 ATLAS ST/N000307/1 ST/M007103/1 ATLAS Upgrades ST/L003112/1 ST/G50228X/1 ST/L001179/1 ATLAS Upgrades ST/K001329/1 ST/M002071/1 ATLAS Upgrades ST/L001195/1 ST/K001310/1 ATLAS ST/K000705/1 ST/I000178/1 ST/M002306/1 ST/L006480/1 ST/L003414/1 ST/I006056/1Resumen
The final ATLAS Run 1 measurements of Higgs boson production and couplings in the decay channel H→ZZ∗→ℓ+ℓ−ℓ'+ℓ'−, where ℓ, ℓ′=e or μ, are presented. These measurements were performed using pp collision data corresponding to integrated luminosities of 4.5 and 20.3 fb−1 at center-of-mass energies of 7 and 8 TeV, respectively, recorded with the ATLAS detector at the LHC. The H→ZZ∗→4ℓ signal is observed with a significance of 8.1 standard deviations, with an expectation of 6.2 standard deviations, at mH=125.36 GeV, the combined ATLAS measurement of the Higgs boson mass from the H→γγ and H→ZZ∗→4ℓ channels. The production rate relative to the Standard Model expectation, the signal strength, is measured in four different production categories in the H→ZZ∗→4ℓ channel. The measured signal strength, at this mass, and with all categories combined, is 1.44+0.40−0.33. The signal strength for Higgs boson production in gluon fusion or in association with t¯t or b¯b pairs is found to be 1.7+0.5−0.4, while the signal strength for vector-boson fusion combined with WH/ZH associated production is found to be 0.3+1.6−0.9.