# Search for Long-Lived Massive Charged Particles in 1.96 TeV pp̅ Collisions

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http://hdl.handle.net/10138/24401

#### Citation

Aaltonen , T , Mehtala , P , Orava , R , Maki , T , Saarikko , H , Osterberg , K & CDF Collaboration 2009 , ' Search for Long-Lived Massive Charged Particles in 1.96 TeV pp̅ Collisions ' , Physical Review Letters , vol. 103 , no. 2 , pp. 021802 . https://doi.org/10.1103/PhysRevLett.103.021802

 Title: Search for Long-Lived Massive Charged Particles in 1.96 TeV pp̅ Collisions Alternative title: Search for Long-Lived Massive Charged Particles in 1.96 TeV $\bar{p}p}$ Collisions Author: Aaltonen, T.; Mehtala, P.; Orava, R.; Maki, T.; Saarikko, H.; Osterberg, K.; CDF Collaboration Contributor organization: Helsinki Institute of PhysicsParticle Physics and Astrophysics Date: 2009 Language: eng Number of pages: 7 Belongs to series: Physical Review Letters ISSN: 0031-9007 DOI: https://doi.org/10.1103/PhysRevLett.103.021802 URI: http://hdl.handle.net/10138/24401 Abstract: We performed a signature-based search for long-lived charged massive particles (CHAMPs) produced in 1.0 $\rm{fb}^{-1}$ of $\bar{p}p$ collisions at $\sqrt{s}=1.96$ TeV, collected with the CDF II detector using a high transverse-momentum ($p_T$) muon trigger. The search used time-of-flight to isolate slowly moving, high-$p_T$ particles. One event passed our selection cuts with an expected background of $1.9 \pm 0.2$ events. We set an upper bound on the production cross section, and, interpreting this result within the context of a stable scalar top quark model, set a lower limit on the particle mass of 249 GeV/$c^2$ at 95% C.L.We performed a signature-based search for long-lived charged massive particles produced in 1.0  fb-1 of pp̅ collisions at √s=1.96  TeV, collected with the CDF II detector using a high transverse-momentum (pT) muon trigger. The search used time of flight to isolate slowly moving, high-pT particles. One event passed our selection cuts with an expected background of 1.9±0.2 events. We set an upper bound on the production cross section and, interpreting this result within the context of a stable scalar top-quark model, set a lower limit on the particle mass of 249  GeV/c2 at 95% C.L. Description: 16 pages, 2 figures; Revision to fix PDF errors on some displays/printers Subject: 114 Physical sciences hep-ex Peer reviewed: Yes Usage restriction: restrictedAccess
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