CMS collaboration (2256 authors)Hollar, JonathanAlmeida, NunoBargassa, PedrameDavid Tinoco Mendes, AndreFaccioli, PietroFerreira Parracho, Pedro GuilhermeGallinaro, MicheleMusella, PasqualeNayak, ArunaPela, JoaoRibeiro, Pedro QuinazSeixas, JoaoVarela, JoaoLloret Iglesias, LaraRodrigues Antunes, JoaoSilva, PedroLeonardo, Nuno2019-02-032019-02-032011-12http://dx.doi.org/10.1103/PhysRevLett.108.111801http://hdl.handle.net/10400.26/26066A search for signatures of extra dimensions in the diphoton invariant-mass spectrum has been performed with the CMS detector at the LHC. No excess of events above the standard model expectation is observed using a data sample collected in proton-proton collisions at sqrt(s) = 7 TeV corresponding to an integrated luminosity of 2.2 inverse femtobarns. In the context of the large-extra-dimensions model, lower limits are set on the effective Planck scale in the range of 2.3-3.8 TeV at the 95% confidence level. These limits are the most restrictive bounds on virtual-graviton exchange to date. The most restrictive lower limits to date are also set on the mass of the first graviton excitation in the Randall-Sundrum model in the range of 0.86-1.84 TeV, for values of the associated coupling parameter between 0.01 and 0.10.engjournal article2019-02-03