606 Result(s)
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Article
Three-prong τ decays with charged kaons
Final states with charged kaons in three-prong τ decays are studied by exploiting the particle identification from the dE/dx measurement. The results are based on a sample of about 1.6 × 105 detected τ pairs coll...
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Article
Results of the first performance tests * of the CMS electromagnetic calorimeter
Performance tests of some aspects of the CMS ECAL were carried out on modules of the "barrel" sub-system in 2002 and 2003. A brief test with high energy electron beams was made in late 2003 to validate prototy...
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Article
Reconstruction of the signal amplitude of the CMS electromagnetic calorimeter
The amplitude of the signal collected from the PbWO4 crystals of the CMS electromagnetic calorimeter is reconstructed by a digital filtering technique. The amplitude reconstruction has been studied with test beam...
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Article
Measurement of the W boson mass and width in e+e- collisions at LEP
The mass of the W boson is determined from the direct reconstruction of W decays in WW→qq̄qq̄ and WW→ℓνqq̄ events in e+e- collisions at LEP. The data sample corresponds to an integrated luminosity of 683 pb-1 col...
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Article
Search for neutral MSSM Higgs bosons at LEP
The four LEP collaborations, ALEPH, DELPHI, L3 and OPAL, have searched for the neutral Higgs bosons which are predicted by the Minimal Supersymmetric standard model (MSSM). The data of the four collaborations ...
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Study of inclusive strange-baryon production and search for pentaquarks in two-photon collisions at LEP
Measurements of inclusive production of the Λ, Ξ- and Ξ*(1530) baryons in two-photon collisions with the L3 detector at LEP are presented. The inclusive differential cross sections for Λ and Ξ- are measured as a ...
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Article
Search for Higgs bosons decaying to WW in e+e- collisions at LEP
A search for Higgs bosons produced in association with a fermion pair, and decaying to WW, is performed with the data collected by the ALEPH detector at centre-of-mass energies ranging from 191 to 209 GeV. The...
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Article
Fermion pair production in e+e- collisions at 189–209 GeV and constraints on physics beyond the standard model
Cross sections, angular distributions and forward-backward asymmetries are presented, of two-fermion events produced in e+e- collisions at centre-of-mass energies from 189 to 209 GeV at LEP, measured with the ALE...
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Article
Partially coherent beam and its applications
The recent progresses on the propagation, generation and application of partially coherent beam (PCB) are reviewed in this paper. A new tensor ABCD law for treating the propagation of partially coherent Gaussi...
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Article
Open AccessStudy of charmonia in four-meson final states produced in two-photon collisions
We report measurements of charmonia produced in two-photon collisions and decaying to four-meson final states, where the meson is either a charged pion or a charged kaon. The analysis is based on a 395 fb-1 data ...
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Article
Open AccessThe CMS barrel calorimeter response to particle beams from 2 to 350 GeV/c
The response of the CMS barrel calorimeter (electromagnetic plus hadronic) to hadrons, electrons and muons over a wide momentum range from 2 to 350 GeV/c has been measured. To our knowledge, this is the widest ra...
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Article
The CMS barrel calorimeter response to particle beams from 2 to 350 GeV/c
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Article
Laser cooling and trap** of ytterbium atoms
The experiments on the laser cooling and trap** of ytterbium atoms are reported, including the two-dimensional transversal cooling, longitudinal velocity Zeeman deceleration, and a magneto-optical trap with ...
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Article
The transportable cesium fountain clock NIM5: its construction and performance
The second laser cooling cesium fountain clock NIM5 at the National Institute of Metrology (NIM) China adopts the (1,1,1) direct optical molasses ( OM) configuration. NIM5 has been running with a stability of ...
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Article
Cold atom interferometers and their applications in precision measurements
Experimental realization of cold 85Rb atom interferometers and their applications in precision measurements are reported in this paper. Mach-Zehnder and Ramsey-Bordè type interferometers were demonstrated. Detail...
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Article
Simulations of inelastic electron tunneling spectroscopy of semifluorinated hexadecanethiol junctions
The inelastic electron tunneling spectroscopy (IETS) of semifluorinated hexadecanethiol junctions is theoretically studied. The numerical results show that the C-F vibration modes of semifluorinated alkanethio...
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Article
Optical properties of FeAs-based parent compound: A comparative study for polycrystalline EuFe2As2 and LaFeAsO
We report on a comparative optical investigation on EuFe2As2 and LaFeAsO polycrystalline samples. The spin-density wave (SDW) partial gap is observed for both compounds. The gap-like absorption peaks in the real ...
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Article
Low-energy Ce spin excitations in CeFeAsO and CeFeAsO0.84F0.16
We use inelastic neutron scattering to study the low-energy spin excitations of polycrystalline samples of nonsuperconducting CeFeAsO and superconducting CeFeAsO0.84F0.16. Two sharp dispersionless modes are found...
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Article
Open AccessCMS tracking performance results from early LHC operation
The first LHC pp collisions at centre-of-mass energies of 0.9 and 2.36 TeV were recorded by the CMS detector in December 2009. The trajectories of charged particles produced in the collisions were reconstructe...
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Open AccessFirst measurement of the underlying event activity at the LHC with \(\sqrt{s} = 0.9\) TeV
A measurement of the underlying activity in scattering processes with p T scale in the GeV region is performed in proton–proton collisions at ...
