Abstract
A search for contact interactions has been performed using dimuon events recorded with the ATLAS detector in proton-proton collisions at sqrt(s) = 7 TeV. The data sample corresponds to an integrated luminosity of 42 pb-1. No significant deviation from the Standard Model is observed in the dimuon mass spectrum, allowing the following 95% C.L. limits to be set on the energy scale of contact interactions: Lambda > 4.9 TeV (4.5 TeV) for constructive (destructive) interference in the left-left isoscalar compositeness model. These limits are the most stringent to date for mumuqq contact interactions.
Highlights
A search detector in for contact interactions has proton-proton collisions at bpeeffisffin1⁄4pe7rfToremVe. dTuhseindgadtaimsuaomnpelevecnotsrrreescpoornddesd with the ATLAS to an integrated luminosity of 42 pbÀ1
No significant deviation from the standard model is observed in the dimuon mass spectrum, allowing the following 95% C.L. limits to be set on the energy scale of contact interactions: Ã > 4:9 TeV (4.5 TeV) for constructive interference in the left-left isoscalar compositeness model
One can describe a new interaction at a higher energy scale with an effective Lagrangian of the form [2]
Summary
Search for contapcffitffi interactions in dimuon events from pp collisions at s 1⁄4 7 TeV with the ATLAS detector. No significant deviation from the standard model is observed in the dimuon mass spectrum, allowing the following 95% C.L. limits to be set on the energy scale of contact interactions: Ã > 4:9 TeV (4.5 TeV) for constructive (destructive) interference in the left-left isoscalar compositeness model. These limits are the most stringent to date for qq contact interactions. This paper presents the results of a search for contact interactions in the dimuon channel, taking advantage of the high pp collision energy of the LHC and the capabilities of ATLAS to detect and measure muons. Precision chambers are continuously monitored by an optical alignment system designed to determine relative chamber positions to an accuracy of 50 m or better
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