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Search for new physics with long-lived particles decaying to photons and missing energy in pp collisions at √s=7 TeV
Name
Chatrchyan2012_Article_SearchForNewPhysicsWithLong-li.pdf
Description
Published version
Size
823.23 KB
Format
Adobe PDF
Checksum (MD5)
0f46f99a1dcf2f465a64d3898afff633
Date Issued
2012
Journal
Journal of High Energy Physics
Publisher
Springer Science and Business Media LLC
Citation
Chatrchyan, S., et al. "Search for New Physics with Long-Lived Particles Decaying to Photons and Missing Energy in Pp Collisions at Root S=7 Tev." Journal of High Energy Physics 11 (2012).
Version
Author's final manuscript
Abstract
A search is performed for long-lived neutral particles decaying into a photon and invisible particles. An example of such a signature is the decay of the lightest neutralino with nonzero lifetime into a gravitino and a photon in gauge-mediated supersymmetry, with the neutralino as the next-to-lightest supersymmetric particle and the gravitino as the lightest. The search uses events containing photons, missing transverse energy, and jets. The impact parameter of the photon relative to the beam-beam collision point can be reconstructed using converted photons. The method is sensitive to lifetimes of the order of 0.1 to 1 ns. The data sample corresponds to an integrated luminosity of 2.23 fb-1 in pp collisions at √s=7 TeV, recorded in the first part of 2011 by the CMS experiment at the LHC. Cross-section limits are presented on pair production for such particles, each of which decays into a photon and invisible particles. The observed 95% confidence level limits vary between 0.11 and 0.21 pb, depending on the neutral particle lifetime.[Figure not available: see fulltext.] © 2012 CERN for the benefit of the CMS collaboration.
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Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
10.1007/JHEP11(2012)172
