Search for anomalous production of highly boosted Z bosons decaying to μ+μ in proton-proton collisions at [Formula presented] TeV

CMS Collaboration

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Results are reported from a search for the anomalous production of highly boosted Z bosons with large transverse momentum and decaying to μ+μ. Such Z bosons may be produced in the decays of new heavy particles. The search uses pp collision data at s=7 TeV, corresponding to an integrated luminosity of 5.0 fb−1 recorded with the CMS detector. The shape of the observed transverse momentum distribution of Z bosons is consistent with standard model expectations. Constraints are obtained on models predicting the production of excited quarks decaying via electroweak processes. Assuming a compositeness scale that is equal to the excited quark mass as well as transition coupling strengths between Z bosons and excited quarks that are equal to standard model couplings to quarks, masses of excited quarks below 1.94 TeVare excluded at the 95% confidence level. For excited quark production via a novel contact interaction, masses below 2.22 TeVare excluded, even if the excited quarks do not couple to gluons.

Original languageEnglish (US)
Pages (from-to)28-47
Number of pages20
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-3
StatePublished - May 13 2013

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


  • CMS
  • Dimuons
  • Excited quarks
  • New phenomena
  • Physics


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