Results are presented from searches for the standard model Higgs boson in proton-proton collisions at root s = 7 and 8 TeV in the Compact Muon Solenoid experiment at the LHC, using data samples corresponding to integrated luminosities of up to 5.1 fb(-1) at 7 TeV and 5.3 fb(-1) at 8 TeV. The search is performed in five decay modes: gamma gamma, ZZ, W+W-, tau(+)tau(-), and b (b) over bar. An excess of events is observed above the expected background, with a local significance of 5.0 standard deviations, at a mass near 125 GeV, signalling the production of a new particle. The expected significance for a standard model Higgs boson of that mass is 5.8 standard deviations. The excess is most significant in the two decay modes with the best mass resolution, gamma gamma and ZZ; a fit to these signals gives a mass of 125.3 +/- 0.4(stat.) +/- 0.5(syst.) GeV. The decay to two photons indicates that the new particle is a boson with spin different from one. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved

The Scientific and Technical Research Council of Turkey, and Turkish Atomic Energy Authorit

Recent results of the searches for Supersymmetry in final states with one or two leptons at CMS are presented. Many Supersymmetry scenarios, including the Constrained Minimal Supersymmetric extension of the Standard Model (CMSSM), predict a substantial amount of events containing leptons, while the largest fraction of Standard Model background events -which are QCD interactions -gets strongly reduced by requiring isolated leptons. The analyzed data was taken in 2011 and corresponds to an integrated luminosity of approximately L = 1 fb −1 . The center-of-mass energy of the pp collisions was √ s = 7 TeV.

If the scale of quantum gravity is near a TeV, the LHC will be producing one black hole (BH) about every second. The BH decays into prompt, hard photons and charged leptons is a clean signature with low background. The absence of significant missing energy allows the reconstruction of the mass of the decaying BH. The correlation between the BH mass and its temperature, deduced from the energy spectrum of the decay products, can test experimentally the higher dimensional Hawking evaporation law. It can also determine the number of large new dimensions and the scale of quantum gravity.PACS numbers: 04.70, 04.50, 14.80.-j Introduction: An exciting consequence of TeV-scale quantum gravity [1] is the possibility of production of black holes (BHs) [2,3,4] at the LHC and beyond. The objective of this paper is to point out the experimental signatures of BH production. Black holes are well understood general-relativistic objects when their mass M BH far exceeds the fundamental (higher dimensional) Planck mass M P ∼TeV. As M BH approaches M P , the BHs become "stringy" and their properties complex. This raises an obstacle to calculating the production and decay of light BHs, those most directly accessible to the LHC, where the center-of-mass (c.o.m.) energy of colliding beams is comparable to the Planck mass. In what follows, we will ignore this obstacle and estimate the properties of light BHs by simple semiclassical arguments, strictly valid for M BH ≫ M P . We expect that this will be an adequate approximation, since the important experimental signatures rely on two simple qualitative properties: (i) the absence of small couplings and (ii) the "democratic" (flavor independent) nature of BH decays, both of which may survive as average properties of the light descendants of black holes. Nevertheless, because of the unknown stringy corrections, our results are approximate estimates. For this reason, we will not attempt selective partial improvements -such as time dependence, angular momentum, charge, hair, and other higher-order general relativistic refinements -which, for light BHs, may be masked by larger unknown stringy effects. We will focus on the production and sudden decay of Schwarzschild black holes.Production: The Schwarzschild radius R S of an (4 + n)-dimensional black hole is given by [5]: