Search for metastable heavy charged particles with large ionisation energy loss in pp collisions at √s=8 TeV using the ATLAS experiment

, The ATLAS collaboration (2015) Search for metastable heavy charged particles with large ionisation energy loss in pp collisions at √s=8 TeV using the ATLAS experiment. European Physical Journal C: Particles and Fields, 75 (9). ISSN 1434-6044

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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 signifi- cant deviation from the Standard Model background expectation is observed, and lifetime-dependent upper limits on Rhadrons 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.

Item Type:
Journal Article
Journal or Publication Title:
European Physical Journal C: Particles and Fields
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2201
Subjects:
ID Code:
80886
Deposited By:
Deposited On:
12 Aug 2016 14:06
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Jan 2021 22:42