Abstract

A search for new high-mass resonances in proton-proton collisions having final states with an electron or muon and missing transverse momentum is presented. The analysis uses proton-proton collision data collected in 2016 with the CMS detector at the LHC at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1. The transverse mass distribution of the charged lepton-neutrino system is used as the discriminating variable. No significant deviation from the standard model prediction is found. The best limit, from the combination of electron and muon channels, is 5.2 TeV at 95% confidence level for the mass of a W′ boson with the same couplings as those of the standard model W boson. Exclusion limits of 2.9 TeV are set on the inverse radius of the extra dimension in the framework of split universal extra dimensions. In addition, model-independent limits are set on the production cross section and coupling strength of W′ bosons decaying into this final state. An interpretation is also made in the context of an R parity violating supersymmetric model with a slepton as a mediator and flavor violating decay.

Highlights

  • Searching for deviations from the steeply falling MT spectrum requires an accurate background estimate at very high transverse masses

  • Model-independent limits are set on the production cross section and coupling strength of W bosons decaying into this final state

  • High mass Drell-Yan samples are generated with powheg at next-to-leading order (NLO), with parton showering and hadronization described by pythia, using the CUETP8M1 tune and NNPDF3.0 parton distribution functions (PDF) set

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Summary

The CMS detector

The central feature of the CMS apparatus is a superconducting solenoid of 6 m internal diameter, providing a magnetic field of 3.8 T. The silicon tracker measures charged particles within the pseudorapidity range |η| < 2.5 It consists of silicon pixel and silicon strip detector modules. The electromagnetic calorimeter consists of 75 848 lead tungstate crystals that provide coverage in pseudorapidity |η| < 1.48 in a barrel region and 1.48 < |η| < 3.00 in two endcap regions. Measured in the silicon tracker results in a relative transverse momentum (pT) resolution in the barrel of about 1–2% for muons with pT 200 GeV and better than 10% for high momentum muons of pT ∼ 1 TeV [14]. Jets are reconstructed offline from the energy deposits in the calorimeter towers, clustered using the anti-kT algorithm [15, 16] with a distance parameter of 0.4 In this process, the contribution from each calorimeter tower is assigned a momentum, the absolute value and the direction of which are given by the energy measured in the tower, and the coordinates of the tower. A more detailed description of the CMS detector can be found in ref. [18]

Physics models and event simulation
Sequential standard model W boson
Varying coupling strength
Split-UED model
RPV SUSY with scalar lepton mediator
Event reconstruction
Event selection
Background
Systematic uncertainties
Interpretation of the results
Statistical analysis
Model-independent cross section limit
Limits on an SSM W boson
Limits on the coupling strength
Interpretation in the split-UED model
Limits on RPV SUSY
Findings
Summary
Full Text
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