Search for anomalous production of highly boosted Z bosons decaying to μ+μ− in proton-proton collisions at [Formula presented] TeV
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol.722, no.1-3, pp.28-47, 2013 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 722 Issue: 1-3
- Publication Date: 2013
- Doi Number: 10.1016/j.physletb.2013.03.037
- Journal Name: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.28-47
- Keywords: CMS, Dimuons, Excited quarks, New phenomena, Physics
- Yıldız Technical University Affiliated: Yes
Abstract
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.