# Search for long-lived particles decaying to photons and missing energy in proton-proton collisions at \sqrt{s} = 7 TeV / - Zurich Open Repository and Archive

CMS Collaboration; Chatrchyan, S; Khachatryan, V; Amsler, C; Chiochia, V; De Visscher, S; Favaro, C; Ivova Rikova, M; Millan Mejias, B; Otiougova, P; Robmann, P; Snoek, H; Tupputi, S; Verzetti, M; et al (2013). Search for long-lived particles decaying to photons and missing energy in proton-proton collisions at \sqrt{s} = 7 TeV /. Physics Letters B, 722(4-5):273-294.

## Abstract

Results are presented from a search for long-lived neutralinos decaying into a photon and an invisible particle, a signature associated with gauge-mediated supersymmetry breaking in supersymmetric models. The analysis is based on a 4.9 inverse femtobarn sample of proton-proton collisions at sqrt(s) = 7 TeV, collected with the CMS detector at the LHC. The missing transverse energy and the time of arrival of the photon at the electromagnetic calorimeter are used to search for an excess of events over the expected background. No significant excess is observed, and lower limits at the 95% confidence level are obtained on the mass of the lightest neutralino, m(neutralino) > 220 GeV (for c tau<500 mm), as well as on the proper decay length of the lightest neutralino, c tau > 6000mm (for m(neutralino) < 150 GeV).

## Abstract

Results are presented from a search for long-lived neutralinos decaying into a photon and an invisible particle, a signature associated with gauge-mediated supersymmetry breaking in supersymmetric models. The analysis is based on a 4.9 inverse femtobarn sample of proton-proton collisions at sqrt(s) = 7 TeV, collected with the CMS detector at the LHC. The missing transverse energy and the time of arrival of the photon at the electromagnetic calorimeter are used to search for an excess of events over the expected background. No significant excess is observed, and lower limits at the 95% confidence level are obtained on the mass of the lightest neutralino, m(neutralino) > 220 GeV (for c tau<500 mm), as well as on the proper decay length of the lightest neutralino, c tau > 6000mm (for m(neutralino) < 150 GeV).

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## Additional indexing

Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2013 12 Mar 2013 12:12 05 Apr 2016 16:38 Elsevier 0370-2693 https://doi.org/10.1016/j.physletb.2013.04.027 http://arxiv.org/abs/1212.1838

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