Measurement of Higgs boson properties using the diphoton decay with the ATLAS detector

High Energy Particle Physics Workshop 2015

Ruan, X.^1

School of Physics, University of the Witwatersrand, Johannesburg

2050, South Africa^1

关键词: Center-of-mass energies;    Differential cross section;    Enriched categories;    Kinematic variables;    Multivariate analysis methods;    Production modes;    Signal significance;    The standard model;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/645/1/012016/pdf
DOI  :  10.1088/1742-6596/645/1/012016

来源: IOP

【 摘 要 】

The Standard Model Higgs boson like particle was observed in July 2012 by both the ATLAS and CMS collaboration at the LHC. The measurements of the Higgs boson properties are performed in Higgs boson decaying into two photons channel after the discovery. Higgs boson production by the gluon-gluon fusion, the vector boson fusion and in association with a W or Z boson or the top-quark pair are measured in this final state. The multivariate analysis method is applied to extract the Higgs boson in the vector boson fusion enriched category to enhance the signal significance. The couplings of each production modes are measured using 20.3 fb-12012 data taken at center-of-mass energy = 8TeV and 4.5 fb-12011 data taken at = 7TeV in ATLAS. No significant deviation from the Standard Model prediction is found. The fiducial and differential cross sections of Higgs boson are measured using 2012 data in this final state as well. The distribution of several kinematic variables of the two photons and jets are studied. The results are compared with several theoretical predictions.