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Search for anomalous production of highly boosted Z bosons decaying to dimuons in proton-proton collisions at sqrt(s) = 7 TeV

par Chatrchyan, Serguei;Clerbaux, Barbara ;De Lentdecker, Gilles ;Dero, Vincent ;Gay, Arnaud ;Hreus, Tomas ;Leonard, Alexandre ;Marage, Pierre ;Mohammadi, Abdollah ;Reis, Thomas ;Thomas, Laurent ;Vander Marcken, G;Vander Velde, Catherine ;Vanlaer, Pascal ;Wang, Jian ; [et al.]
Référence Physics letters. Section B, 722, 1-3, page (28-47)
Publication Publié, 2013

Article révisé par les pairs

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Résumé :

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.