نتایج جستجو برای: gev
تعداد نتایج: 18737 فیلتر نتایج به سال:
Production of Forward Neutrons in e p Collisions at HERA High energy neutron events produced at small angles mrad with respect to the proton beam direction have been observed in neutral current deep inelastic ep scattering at the center of mass energy of GeV by the H experiment at HERA These events represent a xed fraction of the total neutral current deep inelastic sample for neutron energies ...
Theories of family unification predict four left-handed and four right-handed families of quarks and leptons, all with masses below 265 GeV. The lightest mirror quark has a mass of less than 140 GeV. All charged leptons are lighter than 55 GeV, and the lightest is below 40 GeV. All five new neutrinos have masses less than 40 GeV and contribute to the width of the Z . We study the decays of thes...
We have studied the production of muon pairs with invariant masses from 1 to 4 GeV by 20.5 GeV bremsstrahlung radiation. The invariant mass distribution has' a large deviation from the expected Bethe-Heitler shape which we attribute to the Q(3.1 GeV). We determine the $(3.1 GeV) photoproduction cross section to be 1 3.7 + 2.2 1.5 nb at an average photon energy of.18 GeV. (Submitted to Physics L...
A model of a three Pomeron contribution to high energy elastic pp and p̄p scattering is proposed. The data are well described for all momenta (0.01 ≤ |t| ≤ 14. GeV ) and energies (8. ≤ √s ≤ 1800. GeV ) (χ/d.o.f. = 2.74). The model predicts the appearance of two dips in the differential cross-section which will be measured at LHC. The parameters of the Pomeron trajectories are: α(0)P1 = 1.058, α ...
We combine, within the framework of the Standard Model, the results of Higgs search experiments with the information coming from accurate theoretical calculation and precision measurements to provide a probability density function for the Higgs mass, from which all numbers of interest can be derived. The expected value is 170 GeV, with an expectation uncertainty, quantiied by the standard devia...
We compute an array of Standard Model Higgs boson (H) signals and backgrounds for a possible upgrade of the Tevatron to √ s = 4 TeV. Taking m t ≥ 140 GeV, and assuming a total accumulated luminosity of L = 30 fb −1 , we find that a Standard Model Higgs boson with m H < ∼ 110 GeV could almost certainly be detected using the W ± H → lνbb mode. A Higgs boson with mass between ∼ 120 GeV and ∼ 140 G...
Azimuthal anisotropy (v(2)) and two-particle angular correlations of high p(T) charged hadrons have been measured in Au+Au collisions at sqrt[s(NN)]=130 GeV for transverse momenta up to 6 GeV/c, where hard processes are expected to contribute significantly. The two-particle angular correlations exhibit elliptic flow and a structure suggestive of fragmentation of high p(T) partons. The monotonic...
Charm production from the direct reconstruction of D (D → Kπ up to 2 GeV/c) and indirect lepton measurements via charm semileptonic decays (c → e+X at 0.9<pT<5.0 GeV/c and c → μ + X at 0.17<pT<0.25 GeV/c) at sNN = 200 GeV Au+Au collisions are analyzed. The transverse momentum (pT ) spectra and the nuclear modification factors for D and for leptons from heavy flavor decays is presented. Scaling ...
A model of a three Pomeron contribution to high energy elastic pp and p̄p scattering is proposed. The data are well described for all momenta (0.01 ≤ |t| ≤ 14. GeV 2) and energies (8. ≤ √s ≤ 1800. GeV ) (χ2/d.o.f. = 2.60). The model predicts the appearance of two dips in the differential cross-section which will be measured at LHC. The parameters of the Pomeron trajectories are: α(0)P1 = 1.058, ...
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