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Search for long-lived, heavy particles in final states with a muon and multi-track displaced vertex in proton-proton collisions at √s=7 TeV with the ATLAS detector
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ATLAS Collaboration (Including: Farrington, Sinead and Jones, G. (Graham)). (2013) Search for long-lived, heavy particles in final states with a muon and multi-track displaced vertex in proton-proton collisions at √s=7 TeV with the ATLAS detector. Physics Letters B, Volume 719 (Number 4-5). pp. 280-298. doi:10.1016/j.physletb.2013.01.042 ISSN 0370-2693.
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WRAP_Atlas_1-s2.0-S037026931300083X-main.pdf - Published Version Available under License Creative Commons Attribution. Download (1410Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.physletb.2013.01.042
Abstract
Many extensions of the Standard Model posit the existence of heavy particles with long lifetimes. In this
Letter, results are presented of a search for events containing one or more such particles, which decay
at a significant distance from their production point, using a final state containing charged hadrons
and an associated muon. This analysis uses a data sample of proton–proton collisions at
√
s = 7 TeV
corresponding to an integrated luminosity of 4.4 fb−1 collected in 2011 by the ATLAS detector operating
at the Large Hadron Collider. Results are interpreted in the context of R-parity violating supersymmetric
scenarios. No events in the signal region are observed and limits are set on the production cross section
for pair production of supersymmetric particles, multiplied by the square of the branching fraction for a
neutralino to decay to charged hadrons and a muon, based on the scenario where both of the produced
supersymmetric particles give rise to neutralinos that decay in this way. However, since the search
strategy is based on triggering on and reconstructing the decay products of individual long-lived particles,
irrespective of the rest of the event, these limits can easily be reinterpreted in scenarios with different
numbers of long-lived particles per event. The limits are presented as a function of neutralino lifetime,
and for a range of squark and neutralino masses.
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