Search for decays of stopped long-lived particles produced in proton-proton collisions at root s=8TeV

Title
Search for decays of stopped long-lived particles produced in proton-proton collisions at root s=8TeV
Authors
김태정
Keywords
SUPERSYMMETRY
Issue Date
2015-04
Publisher
SPRINGER
Citation
EUROPEAN PHYSICAL JOURNAL C, v. 75, NO 4, Page. 15-35
Abstract
A search has been performed for long-lived particles that could have come to rest within the CMS detector, using the time intervals between LHC beam crossings. The existence of such particles could be deduced from observation of their decays via energy deposits in the CMS calorimeter appearing at times that are well separated from any proton-proton collisions. Using a data set corresponding to an integrated luminosity of 18.6 fb(-1) of 8 TeV proton-proton collisions, and a search interval corresponding to 281 h of trigger livetime, 10 events are observed, with a background prediction of 13.2(-2.5)(+3.6) events. Limits are presented at 95 % confidence level on gluino and top squark production, for over 13 orders of magnitude in the mean proper lifetime of the stopped particle. Assuming a cloud model of R-hadron interactions, a gluino with mass less than or similar to 1000 GeV and a top squark with mass less than or similar to 525 GeV are excluded, for lifetimes between 1 mu s and 1000 s. These results are the most stringent constraints on stopped particles to date.
URI
http://link.springer.com/article/10.1140/epjc/s10052-015-3367-zhttp://hdl.handle.net/20.500.11754/23881
ISSN
1434-6044; 1434-6052
DOI
http://dx.doi.org/10.1140/epjc/s10052-015-3367-z
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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