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

The CMS collaboration

Research output: Contribution to journalArticle

26 Citations (Scopus)

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 18.6-1 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 132-2.5+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 ≲1000 GeV and a top squark with mass ≲525 GeV are excluded, for lifetimes between 1 μs and 1000s. These results are the most stringent constraints on stopped particles to date.

Original languageEnglish
Pages (from-to)1-22
Number of pages22
JournalEuropean Physical Journal C
Volume75
Issue number4
DOIs
Publication statusPublished - 1 Apr 2015
Externally publishedYes

Fingerprint

Calorimeters
Luminance
Deposits
Detectors
collisions
decay
intervals
life (durability)
calorimeters
confidence
actuators
deposits
luminosity
detectors
predictions
interactions
energy

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

Cite this

Search for decays of stopped long-lived particles produced in proton–proton collisions at √s= 8, TeV. / The CMS collaboration.

In: European Physical Journal C, Vol. 75, No. 4, 01.04.2015, p. 1-22.

Research output: Contribution to journalArticle

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