Now showing items 1-10 of 122
Radiation testing of electronics for the CMS endcap muon system
The electronics used in the data readout and triggering system for the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) particle accelerator at CERN are exposed to high radiation levels. This radiation can cause permanent damage to the electronic circuitry, as well as temporary effects such as data corruption induced by Single ...
Search for a non-standard-model Higgs boson decaying to a pair of new light bosons in four-muon final states
Results are reported from a search for non-standard-model Higgs boson decays to pairs of new light bosons, each of which decays into the μ+μ− final state. The new bosons may be produced either promptly or via a decay chain. The data set corresponds to an integrated luminosity of 5.3 fb−1 of proton–proton collisions at √s=7 TeV, recorded by the CMS ...
Search for a Higgs boson decaying into a Z and a photon in pp collisions at √s=7 and 8 TeV
A search for a Higgs boson decaying into a Z boson and a photon is described. The analysis is performed using proton–proton collision datasets recorded by the CMS detector at the LHC. Events were collected at center-of-mass energies of 7 TeV and 8 TeV, corresponding to integrated luminosities of 5.0 fb−1 and 19.6 fb−1, respectively. The selected ...
Measurement of the prompt J/ψ and ψ(2S) polarizations in pp collisions at √s=7 TeV
The polarizations of prompt J/ψ and ψ(2S) mesons are measured in proton–proton collisions at √s=7 TeV, using a dimuon data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 4.9 fb−1. The prompt J/ψ and ψ(2S) polarization parameters λϑλϑ, λφλφ, and λϑφλϑφ, as well as the frame-invariant quantity λ˜, are ...
Search for a new bottomonium state decaying to ϒ(1S)π+π− in pp collisions at √s=8 TeV
The results of a search for the bottomonium counterpart, denoted as Xb, of the exotic charmonium state X(3872) is presented. The analysis is based on a sample of pp collisions at √s=8 TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 20.7 fb−1. The search looks for the exclusive decay channel Xb→ϒ(1S)π+π− ...
New insights of multi-particle azimuthal correlations with symmetric cumulants in p-p, p-Pb, and Pb-Pb collisions
The first comparison of anisotropy harmonics (vn, n = 2–4) and event-by-event correlations of different orders between p–p (13 TeV), p–Pb (5.02 and 8.16 TeV) and Pb–Pb (5.02 TeV) as a function of multiplicity is presented. The vn coefficients are extracted via long-range (|Δη|>2) two-particle correlations reaching a very-high-multiplicity region. ...
Evidence for collective phenomena in pp collisions
Search for heavy long-lived charged particles in pp collisions at √s=7 TeV
The result of a search for heavy long-lived charged particles produced in pp collisions at √s=7 TeV at the LHC is described. The data sample has been collected using the CMS detector and corresponds to an integrated luminosity of 5.0 fb−1. The inner tracking detectors are used to define a sample of events containing tracks with high momentum and high ...
Search for neutral Higgs bosons decaying to tau pairs in pp collisions at √s=7 TeV
A search for neutral Higgs bosons decaying to tau pairs at a center-of-mass energy of 7 TeV is performed using a dataset corresponding to an integrated luminosity of 4.6 fb−1 recorded by the CMS experiment at the LHC. The search is sensitive to both the standard model Higgs boson and to the neutral Higgs bosons predicted by the minimal supersymmetric ...