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|Title:||Search for metastable heavy charged particles with large ionisation energy loss in pp collisions at √ s=8 TeV using the ATLAS experiment|
|Other Titles:||Search for metastable heavy charged particles with large ionisation energy loss in pp collisions at root s=8 TeV using the ATLAS experiment|
|Citation:||European Physical Journal C, 2016; 75(9):407-1-407-25|
|G. Aad, B. Abbott, J. Abdallah, O. Abdinov ... Paul Jackson ... Martin White ... et al.|
|Abstract:||Many extensions of the Standard Model predict the existence of charged heavy long-lived particles, such as R-hadrons or charginos. These particles, if produced at the Large Hadron Collider, should be moving non-relativistically and are therefore identifiable through the measurement of an anomalously large specific energy loss in the ATLAS pixel detector. Measuring heavy long-lived particles through their track parameters in the vicinity of the interaction vertex provides sensitivity to metastable particles with lifetimes from 0.6 ns to 30 ns. A search for such particles with the ATLAS detector at the Large Hadron Collider is presented, based on a data sample corresponding to an integrated luminosity of 18.4 fb−1 of pp collisions at s√=8 TeV. No significant deviation from the Standard Model background expectation is observed, and lifetime-dependent upper limits on R-hadrons and chargino production are set. Gluino R-hadrons with 10 ns lifetime and masses up to 1185 GeV are excluded at 95 % confidence level, and so are charginos with 15 ns lifetime and masses up to 482 GeV.|
|Rights:||© CERN for the benefit of the ATLAS collaboration 2015. This article is published with open access at Springerlink.com|
|Appears in Collections:||Physics publications|
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