نتایج جستجو برای: muon
تعداد نتایج: 7546 فیلتر نتایج به سال:
%e explore possible muon-number-nonconserving processes in gauge theories in which the right-handed muon and electron appear along with neutral heavy leptons in SU(2) U(1) doublets. The same mechanism which gives a mass to the electron and muon is expected to mix the left-handed neutral leptons with the neutrinos. In the simplest case, this leads to a rate for p, ~ey 25 times larger than previo...
Here we invoke the current and future perspective on muon g −2 measurement when asking what the muon g − 2 could tell about the underlying structure concerning with the hierarchy problem. Here we take up two such models, the presence of which turns out to alter the standard model prediction for muon g − 2 significantly: one is TeV scale gravity scenario, the other supersymmetric model, in the l...
We collect and combine all published data on the vertical atmospheric muon flux and the muon charge ratio for muon momenta above 10 GeV. At sea level the world average of the momentum spectra agrees with the flux calculated by E.V. Bugaev et al. within 15 %. The observed shape of the differential flux versus momentum is slightly flatter than predicted in this calculation. The experimental accur...
RPCs built from the new type of Bakelite developed by the BESIII Muon group of IHEP (Beijing) and Gaonengkedi, Inc. (Beijing) for use in the BES III and Daya Bay Muon Systems [1] have achieved acceptable dark noise rates without Linseed oil coating, but aging effects have not been thoroughly studied there is no published report available on this topic. A preliminary study of the Daya Bay Muon S...
We suggest a complete analogy between the lepton current and the Cabibbo theory for hadronic weak interactions. Both neutrinos couple to both the muon and the electron, so at least one of the neutrinos is required to be massive. The two neutrinos have the same type of interactions and are distinguishable only by their masses, like the muon and the electrons. In this theory muon number {or elect...
a * on behalf of the µLan † and µCap ‡ Collaborations. The µLan experiment at the Paul Scherrer Institute will measure the lifetime of the positive muon with a precision of 1 ppm, giving a value for the Fermi coupling constant GF at the level of 0.5 ppm. Meanwhile, by measuring the observed lifetime of the negative muon in pure hydrogen, the µCap experiment will determine the rate of muon captu...
The characteristics of the partial nuclear muon capture with massive left-handed Dirac neutrino and relativistic component of the muon wave function have been derived. The multipole amplitudes are given as a function of neutrino mass parameter and reduced nuclear matrix elements which are modified by the small component of the muon wave function. As an example, the capture rate, asymmetry and p...
The actual design of the muon detector system consists of 6 hadron absorber layers (iron plates of thickness 20, 20, 20, 30, 35, 100 cm) and 15-18 gaseous tracking chambers located in triplets behind each iron slab. The geometry of the muon system is presented in figure 1: the side view of the full system (top), the side wiew of one gap with detector layers (bottom left), and the side view of o...
We present a measurement of the Wc production cross section using soft muon tagging of charm jets. In the W+1 and W+2 jet data sample selected within ∼1.8 fb−1 of proton-antiproton collision data at √ s = 1.96 TeV, we identify jets with a muon from the semileptonic decay of the candidate c-quark. We study the charge correlation of the W boson with the muon. After considering the sources of back...
The mean life of the positive muon has been measured to a precision of 11 ppm using a low-energy, pulsed muon beam stopped in a ferromagnetic target, which was surrounded by a scintillator detector array. The result, tau(micro)=2.197 013(24) micros, is in excellent agreement with the previous world average. The new world average tau(micro)=2.197 019(21) micros determines the Fermi constant G(F)...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید