Search for anomalous production of highly boosted Z bosons decaying to dimuons in pp collisions at s√=7 TeV

CMS Collaboration [--] Quertenmont, Loic [UCL] Basegmez, Suzan [UCL] Bruno, Giacomo [UCL] Castello, Roberto [UCL] Ceard, Ludivine [UCL] Delaere, Christophe [UCL] Du Pree, Tristan [UCL] Favart, Denis [UCL] Forthomme, Laurent [UCL] Giammanco, Andrea [UCL] Hollar, Jonathan [UCL] Lemaitre, Vincent [UCL] Liao, Junhui [UCL] Militaru, Otilia [UCL] Nuttens, Claude [UCL] Pagano, Davide [UCL] Pin, Arnaud [UCL] Piotrzkowski, Krzysztof [UCL] Schul, Nicolas [UCL] Vizan Garcia, Jesús Manuel [UCL] et al.

Results are reported from a search for the anomalous production of highly boosted Z bosons with large transverse momentum and decaying to μ+μ−μ+μ−. Such Z bosons may be produced in the decays of new heavy particles. The search uses pp collision data at View the MathML sources=7 TeV, corresponding to an integrated luminosity of 5.0 fb−15.0 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 TeV are excluded at the 95% confidence level. For excited quark production via a novel contact interaction, masses below 2.22 TeV are excluded, even if the excited quarks do not couple to gluons.