Poster

We present our plans to measure multi-differential cross sections for top-pair (ttbar) production in pp collisions at sqrt(s)=13 TeV, using the full RUN II dataset recorded with the CMS detector.We perform the measurements with the dileptonic decay channel of the ttbar system, requiring two leptons of muon or electron type in the final state.With the data set of about 1 million events, nearly background free, we can study the distributions of kinematical and topological observables in the ttbar events in unprecedented detail and compare the results with the latest Standard Model based predictions.On the poster we will present the motivation for the measurement, the event selection steps, the kinematic reconstruction of the ttbar system and first control plots for the 2017 data set..

Copper molybdate (CuMoO4) has been intensively studied due to its diverse functional properties, including thermochromic, piezochromic, tribochromic, photoelectrochemical as well as catalytic and antibacterial. At room temperature and atmospheric pressure CuMoO4 exists in alpha phase with a bright green colour. [...]

Copper molybdate (CuMoO4) has been intensively studied due to its diverse functional properties, including thermochromic, piezochromic, tribochromic, photoelectrochemical as well as catalytic and antibacterial. At room temperature and atmospheric pressure CuMoO4 exists in alpha phase with a bright green colour. [...]

Precision luminosity calibration is critical to determine fundamental parameters of the standard model and to constrain or to discover beyond-the-standard-model phenomena at LHC. The luminosity determination at the LHC interaction point 5 with the CMS detector, using proton-proton collisions at 13 and 5.02 TeV during Run 2 of the LHC (2015–2018), is reported. [...]

We demonstrate pulse shaping via acousto-optic modulation at a tunable mid-infrared source between wavelengths of 8–15 µm. e optimised pulse shapes aim at modification of molecular wavepackets in the electronic ground state..

A measurement of the inclusive top quark-antiquark pair production cross section in proton proton collisions at a centre-of-mass energy of 13 TeV is used by the CMS experiment, together with the theoretical prediction at next-to-next-to-leading order, to determine the top quark mass and to extract a value of the strong coupling constant with different sets of parton distribution functions. Dilepton events are selected and the cross section is measured from a likelihood fit to the final state distributions. [...]

The Standard Model is one of the most successful theories at describing the strong, weak, and electromagnetic forces and the interactions between the elementary particles.The scalar boson discovered in 2012 at the Large Hadron Collider (LHC) might be consistent with the Higgs boson predicted by the Standard Model, thus validating the Higgs mechanism and therefore representing a further confirmation of this theoretical framework. However, the experimental data still leave plenty of room to determine whether or not an extension of the scalar sector is allowed.The LHC combination of the SM Higgs boson measurements at 7 and 8 TeV allows Higgs boson decays to BSM states with a rate of up to 34% at 95% confidence level.Presence of new physics within the context of the Two-Higgs-Double-Model and NMSSM theories allows the exotic decay of the Higgs boson into a pair of light pseudoscalars. [...]

A huge breakthrough in particle physics was achieved with the discovery of the Higgs boson in 2012, which was followed by precision measurements of its properties. So far, the discovered particle is found to be in good agreement with the predictions of the Standard Model, but there is still sizable room for theories with extended Higgs sectors, like Supersymmetry or general Two Higgs Doublet Models. [...]