Search for new physics in the mumu+e/mu+EslashT channel with a low-pT lepton threshold at the Collider Detector at Fermilab
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Aaltonen-2009-Search for new physi.pdf
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Author(s)
Xie, Si
Knuteson, Bruce O.
Henderson, C.
Hahn, Kristian Allan
Gomez-Ceballos, Guillelmo
Choudalakis, Georgios
Paus, Christoph M. E.
Makhoul, Khaldoun
Bauer, Gerry P
Alternative Title
Search for new physics in the μμ+e/μ+E̸T channel with a low-pT lepton threshold at the Collider Detector at Fermilab
Date Issued
March 2009
Journal
Physical Review D
Publisher
American Physical Society
Citation
CDF Collaboration et al. “Search for new physics in the mumu+e/mu+EslashT channel with a low-pT lepton threshold at the Collider Detector at Fermilab.” Physical Review D 79.5 (2009): 052004. 2009 The American Physical Society
Version
Final published version
Abstract
A search for new physics using three-lepton (trilepton) data collected with the CDF II detector and corresponding to an integrated luminosity of 976 pb[superscript -1] is presented. The standard model predicts a low rate of trilepton events, which makes some supersymmetric processes, such as chargino-neutralino production, measurable in this channel. The μμ+ℓ signature is investigated, where ℓ is an electron or a muon, with the additional requirement of large missing transverse energy. In this analysis, the lepton transverse momenta with respect to the beam direction (p[subscript T]) are as low as 5 GeV/c, a selection that improves the sensitivity to particles that are light as well as to ones that result in leptonically decaying tau leptons. At the same time, this low-p[subscript T] selection presents additional challenges due to the non-negligible heavy-quark background at low lepton momenta. This background is measured with an innovative technique using experimental data. Several dimuon and trilepton control regions are investigated, and good agreement between experimental results and standard-model predictions is observed. In the signal region, we observe one three-muon event and expect 0.4±0.1 μμ+ℓ events from standard-model processes.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevD.79.052004
