Please use this identifier to cite or link to this item: http://buratest.brunel.ac.uk/handle/2438/12001
Title: Search for exotic decays of a Higgs boson into undetectable particles and one or more photons
Authors: CMS Collaboration
Cole, JE
Hobson, PR
Khan, A
Kyberd, P
Leggat, D
Leslie, D
Reid, ID
Symonds, P
Teodorescu, L
Turner, M
Keywords: CMS;Physics;Higgs
Issue Date: 2016
Publisher: Elsevier
Citation: Physics Letters B, 753 pp. 363 - 388, (2016)
Abstract: A search is presented for exotic decays of a Higgs boson into undetectable particles and one or two isolated photons in pp collisions at a center-of-mass energy of 8TeV. The data correspond to an inte-grated luminosity of up to 19.4fb−1collected with the CMS detector at the LHC. Higgs bosons produced in gluon–gluon fusion and in association with a Z boson are investigated, using models in which the Higgs boson decays into a gravitino and a neutralino or a pair of neutralinos, followed by the decay of the neutralino to a gravitino and a photon. The selected events are consistent with the background-only hypothesis, and limits are placed on the product of cross sections and branching fractions. Assuming a standard model Higgs boson production cross section,a 95% confidence level upper limit is set on the branching fraction of a 125GeV Higgs boson decaying into undetectable particles and one or two iso-lated photons as a function of the neutralino mass. For this class of models and neutralino masses from 1 to 120GeV an upper limit in the range of 7 to 13% is obtained. Further results are given as a function of the neutralino lifetime, and also for a range of Higgs boson masses.
URI: http://www.sciencedirect.com/science/article/pii/S037026931500965X
http://bura.brunel.ac.uk/handle/2438/12001
DOI: http://dx.doi.org/10.1016/j.physletb.2015.12.017
ISSN: C
C
0370-2693
Appears in Collections:Dept of Electronic and Computer Engineering Research Papers

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