نتایج جستجو برای: standard limits
تعداد نتایج: 626730 فیلتر نتایج به سال:
A hypothetical violation of Lorentz invariance in the electrons’ equation of motion (expressed within the Lorentz-violating extension of the standard model) leads to a change of the geometry of crystals and thus shifts the resonance frequency of an electromagnetic cavity. This allows experimental tests of Lorentz invariance of the electron sector of the standard model. The material dependence o...
We calculate the typical size of loop corrections to electroweak observables arising from non-standard Ztt and Wtb vertices. We use an effective Lagrangian formalism based on the electroweak gauge group SU(2)L× U(1)Y → U(1)EM . Limits on the non-standard model top quark couplings from electroweak observables are presented and compared with previously obtained limits. ∗This manuscript has been a...
A search for new physics in proton-proton collisions having final states with an electron or muon and missing transverse energy is presented. The analysis uses data collected in 2012 with the CMS detector, at an LHC center-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of 19.7 fb−1. No significant deviation of the transverse mass distribution of the charged lepton-neutri...
Two high-performance liquid chromatographic methods are compared for the determination of monoand oligosaccharides in vegetables using an N H 2 column and acetonitrile-water as the mobile phase. One method uses a gradient elution and evaporative light-scattering detection; method precision (relative standard deviation) ranges from 1.09 to 4.44%, and detection limits range from 0.014 to 0.061 mg...
We obtain limits on generic vector-like leptons at the TeV scale from electroweak precision tests. These limits are complementary to the ones obtained from lepton flavour violating processes. In general, the quality of the global electroweak fit is comparable to the one for the Standard Model. In the case of an extra neutrino singlet mixing with the muon or electron, the global fit allows for a...
This paper elaborates on the rationale behind the proposed standard limits for the accuracy of rainfall intensity measurements obtained from tipping-bucket and other types of rain gauges. Indeed, based on experimental results obtained in the course of international instrument Intercomparison initiatives and specific laboratory tests, it is shown here that the accuracy of operational rain gauges...
Charged-lepton flavor-violating processes are unobservable in the standard model, but they are predicted to be enhanced in several extensions to the standard model, including supersymmetry and models with leptoquarks or compositeness. We present a search for such processes in a sample of 99x10(6)Upsilon(2S) decays and 117x10(6)Upsilon(3S) decays collected with the BABAR detector. We place upper...
The search for the Standard Model Higgs boson with the ATLAS detector at the LHC is reported. The search combines several decay channels in the mass range 110 < mH < 600 GeV and derives upper limits on the production cross section as a function of mH . A search for neutral MSSM Higgs bosons (A/H/h) decaying to τ lepton pairs is also reported, where upper limits on the production cross sections ...
We report on searches for a standard model (SM) Higgs boson in p(̄p) collisions at a center of mass energy √ s = 1.96 TeV with the CDF and DØ detectors using an integrated luminosity of more than 3.0 fb. For a SM Higgs with mass greater than 135 GeV/c, the dominant decay mode is two W bosons and the searches presented are based upon the subsequent electron and muon decays of the two W bosons. Si...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید