Speaker
Mr
Muhammad Ahmad
(Chinese Academy of Sciences (CN))
Description
Integrated fiducial cross sections for the production of four leptons via $H \rightarrow 4\ell$ decays ($\ell = e, \mu$) are measured in pp collisions at $\sqrt{s}=7$ TeV , $\sqrt{s}=8$ TeV and $\sqrt{13}~TeV$. Differential fiducial cross sections are also measured with $\sqrt{s}=8$ TeV data. Measurements are performed with data corresponding to integrated luminosities of 5.1 fb$ ^{-1}$ at 7 TeV, and 19.7 at fb $^{-1}$ at 8 TeV and 2.6 fb$ ^{-1}$ at 13 TeV, collected with the CMS experiment at the LHC. Differential cross sections are determined as functions of the transverse momentum and rapidity of the four-lepton system, accompanying jet multiplicity, transverse momentum of the leading jet, and difference in rapidity between the Higgs boson candidate and the leading jet. A measurement of the $Z \rightarrow 4\ell$ cross section, and its ratio to the $H \rightarrow 4\ell$ cross section is also performed with 8 TeV data . All cross sections are measured within a fiducial phase space defined by the requirements on lepton kinematics and event topology. The integrated $Z \rightarrow 4\ell$ fiducial cross section is measured to be $0.56^{\rm +0.67}_{\rm -0.44} \, {\rm(stat.)}\, ^{\rm +0.21}_{\rm -0.06}\, {\rm (sys.)}$ fb at 7 TeV, and $1.11^{\rm +0.41}_{\rm -0.35} \, {\rm(stat.)}\, ^{\rm +0.14}_{\rm -0.10}\, {\rm (sys.)}$ fb at 8 TeV. The measurements are found to be compatible with theoretical calculations based on the standard model.
Author
Mr
Muhammad Ahmad
(Chinese Academy of Sciences (CN))
