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Search for nonpointing and delayed photons in the diphoton and missing transverse momentum final state in 8 TeV pp collisions at the LHC using the ATLAS detector
KTH, Skolan för teknikvetenskap (SCI), Fysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik.
Vise andre og tillknytning
2014 (engelsk)Inngår i: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 90, nr 11Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A search has been performed, using the full 20.3fb-1 data sample of 8 TeV proton-proton collisions collected in 2012 with the ATLAS detector at the LHC, for photons originating from a displaced vertex due to the decay of a neutral long-lived particle into a photon and an invisible particle. The analysis investigates the diphoton plus missing transverse momentum final state, and is therefore most sensitive to pair production of long-lived particles. The analysis technique exploits the capabilities of the ATLAS electromagnetic calorimeter to make precise measurements of the flight direction, as well as the time of flight, of photons. No excess is observed over the Standard Model predictions for background. Exclusion limits are set within the context of gauge mediated supersymmetry breaking models, with the lightest neutralino being the next-to-lightest supersymmetric particle and decaying into a photon and gravitino with a lifetime in the range from 250 ps to about 100 ns.

sted, utgiver, år, opplag, sider
2014. Vol. 90, nr 11
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-158874DOI: 10.1103/PhysRevD.90.112005ISI: 000346096000001Scopus ID: 2-s2.0-84952026342OAI: oai:DiVA.org:kth-158874DiVA, id: diva2:779166
Forskningsfinansiär
Knut and Alice Wallenberg FoundationSwedish Research Council
Merknad

QC 20150112

Tilgjengelig fra: 2015-01-12 Laget: 2015-01-12 Sist oppdatert: 2017-12-05bibliografisk kontrollert

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Jovicevic, JelenaKuwertz, EmmaLund-Jensen, BengtMorley, AnthonyStrandberg, Jonas
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