Abstract
A search for the standard model Higgs boson produced in association with a W or a Z boson and decaying to a pair of τ leptons is performed. A data sample of proton-proton collisions collected at sqrt{s} = 13 TeV by the CMS experiment at the CERN LHC is used, corresponding to an integrated luminosity of 35.9 fb−1. The signal strength is measured relative to the expectation for the standard model Higgs boson, yielding μ = 2.5− 1.3+ 1.4. These results are combined with earlier CMS measurements targeting Higgs boson decays to a pair of τ leptons, performed with the same data set in the gluon fusion and vector boson fusion production modes. The combined signal strength is μ = 1.24− 0.27+ 0.29 (1.00− 0.23+ 0.24 expected), and the observed significance is 5.5 standard deviations (4.8 expected) for a Higgs boson mass of 125 GeV.
Highlights
Background estimationThe irreducible backgrounds (ZZ, ttZ, WWZ, WZZ, ZZZ, as well as WZ and ttW in the WH channels) are estimated from simulation and scaled by their theoretical cross sections at the highest order available
These results are combined with earlier CMS measurements targeting Higgs boson decays to a pair of τ leptons, performed with the same data set in the gluon fusion and vector boson fusion production modes
The signal samples with a Higgs boson produced in association with a W or a Z boson (WH or ZH) are generated at next-to-leading order (NLO) in perturbative quantum chromodynamics (QCD) with the powheg 2.0 [22,23,24,25,26] generator extended with the MiNLO procedure [27]
Summary
The central feature of the CMS apparatus is a superconducting solenoid 6 m in internal diameter, providing a magnetic field of 3.8 T. Within the solenoid volume there are: a silicon pixel and strip tracker, a lead tungstate crystal electromagnetic calorimeter (ECAL), and a brass and scintillator hadron calorimeter (HCAL). Each of these is composed of a barrel and two endcap sections. Forward hadron calorimeters extend the pseudorapidity (η) coverage provided by the barrel and endcap detectors. A more detailed description of the CMS detector, together with a definition of the coordinate system used and the relevant kinematic variables, can be found in ref. A more detailed description of the CMS detector, together with a definition of the coordinate system used and the relevant kinematic variables, can be found in ref. [21]
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