Search for displaced photons using conversions at 8 TeV

Search for displaced photons using conversions at 8 TeV

CMS

Collaboration

2015

13 pages

Report number:

CMS-PAS-EXO-14-017

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

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Abstract:

A search is performed for long-lived neutral particles decaying to photons and invisible particles. An example of a physics process leading to such a signature is the decay of the lightest neutralino with nonzero lifetime into a gravitino and a photon, as predicted by gauge-mediated supersymmetric models. The search is based on events containing at least two photons of which at least one has converted to an

e^{+}e^{-}

pair, at least two jets, and missing transverse energy. The transverse impact parameter can be reconstructed using photons converting into

e^{+}e^{-}

pairs. We consider scenarios in which the neutralino has a mean lifetime between

c\tau =

0.4 and 100 cm. The analysis was performed on a data sample collected by the CMS experiment at the LHC in 2012 at center-of-mass energy

\sqrt{s}=8

TeV and corresponds to an integrated luminosity of

19.7

fb

^{-1}

of proton--proton collisions.

Note:

Preliminary results

Data
p p: scattering
p p: colliding beams
neutral particle: long-lived
neutral particle: pair production
transverse energy: missing-energy
calorimeter: electromagnetic
photon: time delay
photon: time-of-flight
track data analysis: vertex

References(0)

Figures(7)

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