149 research outputs found

    Study of the ρ\rho, ω\omega, ϕηγ7γ\phi\to\eta\gamma\to 7\gamma Decays with an SND Detector on a VEPP-2M Collider

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    The e+eηγ7γe^+e^-\to\eta\gamma\to 7\gamma process was studied in the energy range 2E=600÷10602E=600\div 1060 MeV with an SND detector on a VEPP-2M e+ee^+e^- collider. The decay branching ratios B(ϕηγ)=(1.343±0.012±0.055)102B(\phi\to\eta\gamma)=(1.343\pm 0.012\pm 0.055)\cdot 10^{-2}, B(ωηγ)=(4.60±0.72±0.19)104B(\omega\to\eta\gamma)=(4.60\pm 0.72\pm 0.19)\cdot 10^{-4}, and B(ρηγ)=(2.69±0.32±0.16)104B(\rho\to\eta\gamma)=(2.69\pm 0.32\pm 0.16)\cdot 10^{-4} were measured.Comment: 5 pages, 4 figure

    Performance and Operation of the CMS Electromagnetic Calorimeter

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    The operation and general performance of the CMS electromagnetic calorimeter using cosmic-ray muons are described. These muons were recorded after the closure of the CMS detector in late 2008. The calorimeter is made of lead tungstate crystals and the overall status of the 75848 channels corresponding to the barrel and endcap detectors is reported. The stability of crucial operational parameters, such as high voltage, temperature and electronic noise, is summarised and the performance of the light monitoring system is presented

    The Physics of the B Factories

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    This work is on the Physics of the B Factories. Part A of this book contains a brief description of the SLAC and KEK B Factories as well as their detectors, BaBar and Belle, and data taking related issues. Part B discusses tools and methods used by the experiments in order to obtain results. The results themselves can be found in Part C

    CMS physics technical design report : Addendum on high density QCD with heavy ions

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