1,784 research outputs found
3rd KEK International Users Meeting on the Support and Environments of High-energy Physics Computing
No full textFirst observation of the decays B0 -> D+K-π+π- and B- -> D0K-π+π-
No full textFirst observations of the Cabibbo-suppressed decays B0→D+K-π+π- and B-→D0K-π+π- are reported using 35pb -1 of data collected with the LHCb detector. Their branching fractions are measured with respect to the corresponding Cabibbo-favored decays, from which we obtain B(B0→D+K-π+π-)/B(B0→D+π-π+π-)=(5.9±1.1±0.5) ×10-2 and B(B-→D0K-π+π-)/B(B-→D0π-π+π-)=(9.4±1.3±0.9) ×10-2, where the uncertainties are statistical and systematic, respectively. The B-→D0K-π+π- decay is particularly interesting, as it can be used in a similar way to B-→D0K- to measure the Cabibbo-Kobayashi-Maskawa phase γ
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Elastic Neutrino-Electron Scattering: A Progress Report on Exp734 at Brookhaven
No full textI will report preliminary results on elastic neutrino-electron scattering from data taken with the 200 ton segmented liquid scintillator - proportional drift-tube neutrino detector at Brookhaven. Features of the detector (such as the active target and long radiation length) permit a uniquely clean signal. Prospects of results from the completed analysis and further data taking are discussed
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Progress in an Experiment to Measure Elastic Nu. Mu. E. -->. Nu. Mu. E Scattering
No full textThe experimental setup and preliminary results of nu..mu.. + e elastic scattering measurements are described. (WHK
Measurement of the electron charge asymmetry in inclusive W production in pp collisions at √s = 7 TeV in the CMS experiment.
No full textIn this thesis, two measurements of the electron charge asymmetry in inclusive W boson production with the CMS detector are presented. The measurements are obtained from proton-proton collision data with sqrt(s) = 7 TeV. The first measurement is performed with data corresponding to an integrated luminosity of 36 pb-1 collected by the CMS detector in 2010 and the second one uses data corresponding to 840 pb-1 collected during the first half of 2011.
In proton-proton collisions, more W+ bosons are produced relative to W- due to the prevalence of up-type quarks with respect to down-type valence quarks in the proton. A measurement of this asymmetry as a function of the boson rapidity can provide valuable information on the u/d ratio within the proton. Since the boson rapidity cannot be directly measured due to the longitudinal momentum carried by the undetected neutrino, the asymmetry is measured as a function of the pseudorapidity of the charged lepton, in this case the electron, from the W decay.
In both measurements, events are selected by requiring a single electron with tight selection criteria on quality of identification and measurement of the energy of the electron. The signal yield is extracted using extended maximum likelihood fits to the missing transverse energy spectrum using a set of reference template shapes for the signal, electroweak background and QCD background. The templates are obtained using Monte Carlo simulation, corrected with information from collision data events (for the signal and electroweak backgrounds), and a control sample of events obtained from an inverted selection (for the QCD background).
In the first measurement the charge asymmetry is measured in 6 bins of the absolute value of the electron’s pseudorapidity and compared with predictions from theory. The statistical error ranges from 0.006 to 0.010. The increased amount of data in the second measurement allows the results to be presented in 11 bins of the absolute value of the electron’s pseudorapidity. The statistical error has been reduced and ranges from 0.003 to 0.004 and the global error is in the range 0.006 to 0.014.Open Acces
Structure of the Staphylococcus aureus cell wall determined by the freeze-substitution method
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