Abstract

This Letter describes the search for an enhanced production rate of events with a charged lepton and a neutrino in high-energy pp collisions at the LHC. The analysis uses data collected with the CMS detector, with an integrated luminosity of 5.0 inverse femtobarns at sqrt(s) = 7 TeV, and a further 3.7 inverse femtobarns at sqrt(s) = 8 TeV. No evidence is found for an excess. The results are interpreted in terms of limits on a heavy charged gauge boson (W') in the sequential standard model, a split universal extra dimension model, and contact interactions in the helicity-nonconserving model. For the last, values of the binding energy below 10.5 (8.8) TeV in the electron (muon) channel are excluded at a 95% confidence level. Interpreting the ell nu final state in terms of a heavy W' with standard model couplings, masses below 2.90 TeV are excluded.

Highlights

  • New heavy gauge bosons are predicted by various extensions of the standard model (SM)

  • Uncertainties in the energy scale and the energy resolution make comparable contributions to the overall uncertainty in the electron channel: the energy scale has an uncertainty of 1(3)% in the barrel and the resolution has an uncertainty of 1.4(3)% for the barrel [16]

  • The impact of the EmT iss energy scale is modeled by shifting the hadronic component event by event by 10%, while the resolution is taken into account by a 10% smearing

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Summary

INTRODUCTION

New heavy gauge bosons are predicted by various extensions of the standard model (SM). The sequential standard model (SSM) [1] postulates the existence of a W0 boson, a heavy analogue of the W In such a theory, the W0 is expected to appear as a narrow resonance with decay modes and branching fractions similar to those of the W. Other models for new physics predict the same final state, such as those with universal extra dimensions (UED) and bulk fermions, or split UED [4,5]. Such models of extended space-time assume one additional compact dimension of radius R. In this Letter, a search is presented for an excess of events with an isolated charged lepton (an electron or muon) and a neutrino in the final state, using the CMS dlaunemtdeic3nt:oo7sr.iftbyTÀho1efa5td:ap0taffisfffi b1⁄4sÀa1m8apTtleepVffiscffi oc1⁄4rorle7lespcTtoeenVddiscnot2oll0e1acn2te.diTnihtneeg2Cr0aM1te1Sd, 2011 result has been published in Ref. [2]

THE CMS DETECTOR
THE SEARCH STRATEGY
RESULTS AND EXCLUSION
SUMMARY
Full Text
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