The properties of a Higgs boson candidate are measured in the H -> ZZ -> 4l decay channel, with l = e, mu, using data from pp collisions corresponding to an integrated luminosity of 5.1 fb(-1) at the center-of-mass energy of root s = 7 TeV and 19.7 fb(-1) at ffiffiffi root s = 8 TeV, recorded with the CMS detector at the LHC. The new boson is observed as a narrow resonance with a local significance of 6.8 standard deviations, a measured mass of 125.6 +/- 0.4(stat) +/- 0.2(syst) GeV, and a total width <= 3.4 GeV at the 95% confidence level. The production cross section of the new boson times its branching fraction to four leptons is measured to be 0.93(-0.23)(+0.26) (stat)(-0.09)(+0.13) (syst) times that predicted by the standard model. Its spin-parity properties are found to be consistent with the expectations for the standard-model Higgs boson. The hypotheses of a pseudoscalar and all tested spin-1 boson hypotheses are excluded at the 99% confidence level or higher. All tested spin-2 boson hypotheses are excluded at the 95% confidence level or higher.

Measurement of the properties of a Higgs boson in the four-lepton final state / S., C., V., K., A. M., S., A., T., W., A., T., B., M., D., J., E., C., F., M., F., R., F., V. M., G., C., H., N., H., J., H., M., J., W., K., V., K., M., K., I., K., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 89:9(2014), p. 092007. [10.1103/physrevd.89.092007]

Measurement of the properties of a Higgs boson in the four-lepton final state

BARONE, Luciano Maria;DEL RE, Daniele;LONGO, Egidio;MARGAROLI, Fabrizio;MICHELI, FRANCESCO;ORGANTINI, Giovanni;PARAMATTI, Riccardo;RAHATLOU, SHAHRAM;SOFFI, LIVIA;TRACZYK, PIOTR WOJCIECH;SANTANASTASIO, FRANCESCO;
2014

Abstract

The properties of a Higgs boson candidate are measured in the H -> ZZ -> 4l decay channel, with l = e, mu, using data from pp collisions corresponding to an integrated luminosity of 5.1 fb(-1) at the center-of-mass energy of root s = 7 TeV and 19.7 fb(-1) at ffiffiffi root s = 8 TeV, recorded with the CMS detector at the LHC. The new boson is observed as a narrow resonance with a local significance of 6.8 standard deviations, a measured mass of 125.6 +/- 0.4(stat) +/- 0.2(syst) GeV, and a total width <= 3.4 GeV at the 95% confidence level. The production cross section of the new boson times its branching fraction to four leptons is measured to be 0.93(-0.23)(+0.26) (stat)(-0.09)(+0.13) (syst) times that predicted by the standard model. Its spin-parity properties are found to be consistent with the expectations for the standard-model Higgs boson. The hypotheses of a pseudoscalar and all tested spin-1 boson hypotheses are excluded at the 99% confidence level or higher. All tested spin-2 boson hypotheses are excluded at the 95% confidence level or higher.
2014
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of the properties of a Higgs boson in the four-lepton final state / S., C., V., K., A. M., S., A., T., W., A., T., B., M., D., J., E., C., F., M., F., R., F., V. M., G., C., H., N., H., J., H., M., J., W., K., V., K., M., K., I., K., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 89:9(2014), p. 092007. [10.1103/physrevd.89.092007]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/631243
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