Abstract
Results are reported from a search for the effects of contact interactions using events with a high-mass, oppositely charged muon pair. The events are collected in proton-proton collisions at sqrt(s) = 7 TeV using the Compact Muon Solenoid detector at the Large Hadron Collider. The data sample corresponds to an integrated luminosity of 5.3 inverse femtobarns. The observed dimuon mass spectrum is consistent with that expected from the standard model. The data are interpreted in the context of a quark- and muon-compositeness model with a left-handed isoscalar current and an energy scale parameter Lambda. The 95% confidence level lower limit on Lambda is 9.5 TeV under the assumption of destructive interference between the standard model and contact-interaction amplitudes. For constructive interference, the limit is 13.1 TeV. These limits are comparable to the most stringent ones reported to date.
Highlights
The existence of three families of quarks and leptons might be explained if these particles are composed of more fundamental constituents
The left-left isoscalar model (LLIM) is the conventional benchmark for contact interaction (CI) in the dilepton channel
We report a search channel produced in pp collisions afot rpCffisffiI1⁄4in7thTeedVileupsitnogn the Compact Muon Solenoid (CMS) detector at the Large
Summary
The existence of three families of quarks and leptons might be explained if these particles are composed of more fundamental constituents. The dimuons from the subprocesses for standard model (SM) Drell-Yan (DY) [5] production and from CI production can have the same helicity state. In this case, the scattering amplitudes are summed, resulting in an interference term in the cross section for pp ! The LLIM is the conventional benchmark for CI in the dilepton channel. For this analysis, all initial-state quarks are assumed to be composite. The best limits in the LLIM dimuon channel are à > 9:6 TeV for destructive interference and à >. The data sample corresponds to an integrated luminosity of 5:3 fbÀ1
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