CMS results on flavour physics Ronchese, P.
Nuclear and particle physics proceedings,
06/2015, Letnik:
263-264
Journal Article
Recenzirano
Thanks to the excellent tracking and muon identification performance, combined with a flexible trigger system, the CMS experiment at the Large Hadron Collider is conducting a rich and competitive ...program of measurements in the field of heavy flavor physics. In this talk we review our results on heavy flavour physics, based on a data sample collected by the CMS detector.
First CMS results at 13 TeV Ronchese, P.
EPJ Web of Conferences,
01/2016, Letnik:
130
Journal Article, Conference Proceeding
Recenzirano
Odprti dostop
Measurements of b-hadron and quarkonium production cross sections provide essential information to understand QCD. This talk will show new measurements of double-differential production cross ...sections vs. transverse momentum pT and rapidity y, at center-of-mass energy √s = 13 TeV, performed by CMS experiment with data collected in 2015. Comparisons with results obtained at √s = 7 TeV will be shown.
The phase $\Phi_s$ is the key parameter for the CP-violation of the
$B^0_s$-$\bar{B^0_s}$ system. An angular and proper decay time analysis is
applied to the $B^0_s \rightarrow J/\psi \Phi$ events. ...Using a data sample
collected by the CMS and ATLAS experiments in LHC Run1, the $B^0_s$ signal
candidates are reconstructed and are used to extract the phase $\Phi_s$. We
present the latest update on the results in this decay channel.
The latest results of CMS in the area of exotic quarkonium decays will be presented: observation of a peaking structure in \(J/\psi\Phi\) mass spectrum in the decay \(B^\pm \rightarrow J/\psi \Phi ...K^\pm\), search for new bottomonium states in \(\Upsilon(1\mathrm{S})\pi^+\pi^-\) mass spectrum, measurement of prompt \(J/\psi\) pair production.
A sample of ASIC prototypes of the first-level trigger front-end device for the muon barrel drift chambers of CMS was tested on a full size chamber prototype. Tests were performed at several incident ...angles on cosmic rays and at normal incidence using a muon beam. The chamber was irradiated using a
137
C
s gamma source to simulate the LHC radiation environment. The performance of the tested prototypes with respect to efficiency, resolution and noise issues is reported.
Three simplified prototypes of the first-level trigger front-end device for the muon barrel drift chambers of CMS were tested on a chamber prototype. Tests were performed at several incidence angles ...of a muon beam and with different magnetic field configurations.
The recorded drift times were also used to test a full software model reproducing the actual algorithm applied in the final ASIC being produced.
The efficiency performance of this software model and of the tested prototype are presented in this paper.
The development of the barrel drift chambers for the CMS muon detector at the CERN
Large Hadron Collider is supported by a variety of simulation calculations, based on the GARFIELD drift chamber ...simulation program and the GEANT detector simulation package. This study surveys the results influencing the actual chamber design. The dependence of the drift cell performance on shape and position of the cell electrodes as well as on the mechanical tolerances is shown. The results obtained for space-time relation and spatial resolution are in good agreement to test beam measurements on prototypes.
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