Abstract
Measurements of the total and differential fiducial cross sections for the Z boson decaying into two neutrinos are presented at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV. The data were collected by the CMS detector in 2016 and correspond to an integrated luminosity of 35.9 fb−1. In these measurements, events are selected containing an imbalance in transverse momentum and one or more energetic jets. The fiducial differential cross section is measured as a function of the Z boson transverse momentum. The results are combined with a previous measurement of charged-lepton decays of the Z boson. The measured total fiducial cross section for events with Z boson transverse momentum greater than 200 GeV is {3000}_{-170}^{+180} fb.
Highlights
Muons, which leads to a smaller statistical uncertainty
This paper presents the first inclusive, differential, and normalized fiducial cross section measurements as functions of pZT, where the Z boson is identified via its decay to a pair of neutrinos
A silicon pixel and strip tracker, a lead tungstate crystal electromagnetic calorimeter (ECAL), and a brass and scintillator hadron calorimeter (HCAL), each composed of a barrel and two end sections reside within the solenoid volume
Summary
The central feature of the CMS apparatus is a superconducting solenoid of 6 m internal diameter, providing a magnetic field of 3.8 T. Events are reconstructed using a particle-flow (PF) algorithm [26], which combines information from the tracker, calorimeters, and muon systems to reconstruct and identify charged and neutral hadrons, photons, muons, and electrons. An isolation variable is defined by the pT sum over charged PF candidates associated to the PV and neutral PF particles within a cone around the lepton of radius ∆R = (∆η)2 + (∆φ)2 = 0.4, excluding the lepton. The τ leptons that decay to hadrons (τh) are identified using the “hadron-plus-strips” algorithm [38] This algorithm constructs candidates seeded by PF jets that are consistent with τ lepton decay with one or three charged pions. Decay candidates are, in similarity to electron and muon candidates, required to satisfy an isolation criterion as described in ref. Corrections for pileup effects are applied to the isolation criteria and depend on the η of the photon
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