A5034957287- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Metal Forming Simulation Techniques
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Metallurgy and Material Forming
- Additive Manufacturing and 3D Printing Technologies
- Computational Physics and Python Applications
- Manufacturing Process and Optimization
- Metal and Thin Film Mechanics
- Advanced machining processes and optimization
- Advanced Surface Polishing Techniques
- Black Holes and Theoretical Physics
- Atomic and Subatomic Physics Research
- Tribology and Lubrication Engineering
- Injection Molding Process and Properties
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Microstructure and mechanical properties
- Neutrino Physics Research
- Nuclear Physics and Applications
- Engineering Technology and Methodologies
- Laser Material Processing Techniques
- Thermal Radiation and Cooling Technologies
TH Köln - University of Applied Sciences
2013-2025
Institute of High Energy Physics
2008-2018
European Organization for Nuclear Research
2011-2014
ETH Zurich
2012
Austrian Academy of Sciences
2007-2011
UCLouvain
2011
TU Wien
2007
Hochschule Aalen
2003
Paderborn University
1994-1997
The Compact Muon Solenoid (CMS) detector is described. operates at the Large Hadron Collider (LHC) CERN. It was conceived to study proton-proton (and lead-lead) collisions a centre-of-mass energy of 14 TeV (5.5 nucleon-nucleon) and luminosities up 1034 cm−2 s−1 (1027 s−1). At core CMS sits high-magnetic-field large-bore superconducting solenoid surrounding an all-silicon pixel strip tracker, lead-tungstate scintillating-crystals electromagnetic calorimeter, brass-scintillator sampling hadron...
This paper describes the CMS trigger system and its performance during Run 1 of LHC. The consists two levels designed to select events potential physics interest from a GHz (MHz) interaction rate proton-proton (heavy ion) collisions. first level is implemented in hardware, selects containing detector signals consistent with an electron, photon, muon, τ lepton, jet, or missing transverse energy. A programmable menu up 128 object-based algorithms used for subsequent processing. thresholds are...
Properties of the Higgs boson with mass near 125 $$\,\text {GeV}$$ are measured in proton-proton collisions CMS experiment at LHC. Comprehensive sets production and decay measurements combined. The channels include $$\gamma \gamma $$ , $$\mathrm{Z}\mathrm{Z}$$ $$\mathrm{W}\mathrm{W}$$ $$\tau \tau $$\mathrm{b} \mathrm{b} $$\mu \mu pairs. data samples were collected 2011 2012 correspond to integrated luminosities up 5.1 {fb}^\text {-1}$$ 7 {TeV}$$ 19.7 8 . From high-resolution channels, is...
Results on two-particle angular correlations for charged particles produced in pp collisions at a center-of-mass energy of 13 TeV are presented. The data were taken with the CMS detector LHC and correspond to an integrated luminosity about 270 inverse nanobarns. studied over broad range pseudorapidity (abs(eta) < 2.4) full azimuth (phi) as function particle multiplicity transverse momentum (pt). In high-multiplicity events, long-range (abs(Delta eta) > 2.0), near-side (Delta phi...
Searches for invisible decays of the Higgs boson are presented. The data collected with CMS detector at LHC correspond to integrated luminosities 5.1, 19.7, and 2.3 inverse femtobarns centre-of-mass energies 7, 8, 13 TeV, respectively. search channels target production via gluon fusion, vector in association a boson. Upper limits placed on branching fraction decay particles, as function assumed cross sections. combination all channels, assuming standard model production, yields an observed...
The jet fragmentation function of inclusive jets with transverse momentum ${p}_{\mathrm{T}}$ above $100\phantom{\rule{0.28em}{0ex}}\text{GeV}/c$ in PbPb collisions has been measured using reconstructed charged particles $1\phantom{\rule{0.28em}{0ex}}\text{GeV}/c$ a cone radius 0.3 around the axis. A data sample collected 2011 at nucleon-nucleon center-of-mass energy $\sqrt{{s}_{{}_{\mathit{NN}}}}=2.76\phantom{\rule{0.28em}{0ex}}\text{TeV}$ corresponding to an integrated luminosity...
In searches for new physics in the energy regime of LHC, it is becoming increasingly important to distinguish single-jet objects that originate from merging decay products W bosons produced with high transverse momenta jets initiated by single partons. Algorithms are defined identify such different signals interest, using techniques also applicable other decays hadrons result a jet, as those highly boosted Z and Higgs bosons. The efficiency tagging measured data collected CMS detector at...
A measurement of the double-differential inclusive jet cross section as a function transverse momentum p T and absolute rapidity |y| is presented. Data from LHC proton-proton collisions at $$ \sqrt{s}=8 TeV, corresponding to an integrated luminosity 19.7 fb−1, have been collected with CMS detector. Jets are reconstructed using anti-k clustering algorithm size parameter 0.7 in phase space region covering 74 GeV up 2.5 TeV = 3.0. The low-p range between 21 also studied 4.7, dedicated data...
The differential cross section and charge asymmetry for inclusive pp to W + X mu neutrino production at sqrt(s) = 8 TeV are measured as a function of muon pseudorapidity. data sample corresponds an integrated luminosity 18.8 inverse femtobarns recorded with the CMS detector LHC. These results provide important constraints on parton distribution functions proton in range Bjorken scaling variable x from 10E-3 10E-1.
A search for neutral Higgs bosons decaying into a $$ \mathrm{b}\overline{\mathrm{b}} quark pair and produced in association with at least one additional b is presented. This signature sensitive to the sector of minimal supersymmetric standard model (MSSM) large values parameter tan β. The analysis based on data from proton-proton collisions center-of-mass energy 8 TeV collected CMS detector LHC, corresponding an integrated luminosity 19.7 fb−1. results are combined previous 7 data. No signal...
An analysis of dijet events in PbPb and pp collisions is performed to explore the properties energy loss by partons traveling a quark-gluon plasma. Data are collected at nucleon-nucleon center-of-mass 2.76 TeV LHC. The distribution transverse momentum (pT) surrounding systems measured selecting charged particles different ranges pT angular cones pseudorapidity azimuth. measurement as function centrality collisions, asymmetry jets pair, distance parameter R used anti-kt jet clustering...
A search is performed for heavy Majorana neutrinos (N) decaying into a W boson and lepton using the CMS detector at Large Hadron Collider. signature of two jets either same sign electrons or electron-muon pair searched 19.7 fb−1 data collected during 2012 in proton-proton collisions centre-of-mass energy 8 TeV. The are found to be consistent with expected standard model (SM) background and, context Type-1 seesaw mechanism, upper limits set on cross section times branching fraction production...
Normalized double-differential cross sections for top quark pair (t t-bar) production are measured in pp collisions at a centre-of-mass energy of 8 TeV with the CMS experiment LHC. The analyzed data correspond to an integrated luminosity 19.7 inverse femtobarns. measurement is performed dilepton e+/- mu-/+ final state. t t-bar section determined as function various pairs observables characterizing kinematics and system. compared calculations using perturbative quantum chromodynamics...
A measurement of the $$ \mathrm{t}\overline{\mathrm{t}} production cross section at \sqrt{s}=13 TeV is presented using proton-proton collisions, corresponding to an integrated luminosity 2.2 fb−1, collected with CMS detector LHC. Final states one isolated charged lepton (electron or muon) and least jet are selected categorized according accompanying multiplicity. From a likelihood fit invariant mass distribution identified as coming from hadronization bottom quark, measured be...
The production of Z bosons is studied in the dimuon and dielectron decay channels PbPb pp collisions at $$ \sqrt{s_{NN}}=2.76 TeV, using data collected by CMS experiment LHC. sample corresponds to an integrated luminosity about 166 μb−1, while 2013 same nucleon-nucleon centre-of-mass energy has 5.4 pb−1. boson yield measured as a function rapidity, transverse momentum, collision centrality. ratio yields, scaled number inelastic collisions, found be 1.06 ± 0.05 (stat) 0.08 (syst) channel 1.02...
Integrated fiducial cross sections for the production of four leptons via H → 4ℓ decays (ℓ = e, μ) are measured in pp collisions at $$ \sqrt{s}=7 and 8TeV. Measurements performed with data corresponding to integrated luminosities 5.1 fb−1 7TeV, 19.7 8 TeV, collected CMS experiment LHC. Differential using TeV data, determined as functions transverse momentum rapidity four-lepton system, accompanying jet multiplicity, leading jet, difference between Higgs boson candidate jet. A measurement Z...
Laser welding has become well established for joining Ni-Ti-based shape memory alloys and extends the manufacturability of highly functional components with complex geometries. Published studies on effect laser alterations to microstructure properties these alloys, however, mainly deal conventional component dimensions linear beam movement. In view increasing importance microtechnology, research into thin-walled Ni-Ti is therefore interest. At same time, comparing oscillating movement other...
A search for a very light Higgs boson decaying into pair of τ leptons is presented within the framework next-to-minimal supersymmetric standard model. This based on data set corresponding to an integrated luminosity 19.7 fb−1 proton-proton collisions collected by CMS experiment at centre-of-mass energy 8 TeV. The signal defined production either two lightest scalars, h1 or h2, via gluon-gluon fusion and subsequent decay bosons, a1 h1. h2 identified with observed state mass 125 GeV. analysis...
The WZ production cross section is measured by the CMS experiment at CERN LHC in proton-proton collision data samples corresponding to integrated luminosities of 4.9 inverse femtobarns collected sqrt(s)= 7 TeV, and 19.6 8 TeV. measurements are performed using fully-leptonic decay modes with electrons muons final state. sections for 71 < m[Z] 111 GeV sigma(pp WZ; TeV) = 20.14 +/- 1.32 (stat) 1.13 (syst) 0.44 (lumi) pb 24.09 0.87 1.62 0.63 pb. Differential respect Z boson pt, leading jet...
A search is presented for W' bosons in events with an electron or muon and large missing transverse momentum, using proton-proton collision data at sqrt(s) = 13 TeV collected the CMS detector 2015 corresponding to integrated luminosity of 2.3 inverse femtobarns. No evidence excess relative standard model expectations observed. For a boson described by sequential model, upper limits 95% confidence level are set on product production cross section branching fraction lower established new mass....
Interactions between jets and the quark-gluon plasma produced in heavy ion collisions are studied via angular distributions of summed charged-particle transverse momenta (p T) with respect to both leading subleading jet axes high-p T dijet events. The contributions charged particles different momentum ranges overall event p balance decomposed into short-range peaks a long-range azimuthal asymmetry T. results for PbPb compared those pp using data collected 2011 2013, at collision energy $$...