نتایج جستجو برای: gev
تعداد نتایج: 18737 فیلتر نتایج به سال:
We report measurements of the differential cross sections of P” and $ meson photoproduction on hydrogen for a range of fourmomentum transfer squared, t , from -0. 2(GeV/c)2 to -0. 9(GeV/c)2 and a range of incident photon energies from 6.5 GeV to 17.8 GeV. We find that differential cross sections obtained for p” production are in good agreement with the vector dominance model. * Work supported b...
Possible indirect detection of neutralino, through its γ-ray annihilation product, by the forthcoming GLAST satellite from our galactic halo, M31, M87 and the dwarf galaxies Draco and Sagittarius is studied. γ-ray fluxes are evaluated for the two representative energy thresholds, 0.1 GeV and 1 GeV, at which the spatial resolution of GLAST varies considerably. Apart from dwarfs which are describ...
Recent accurate measurements of cosmic-ray (CR) species by ATIC-2, CREAM, and PAMELA reveal an unexpected hardening in the proton and He spectra above a few hundred GeV, a gradual softening of the spectra just below a few hundred GeV, and a harder spectrum of He compared to that of protons. These newly discovered features may offer a clue to the origin of high-energy CRs. We use the Fermi Large...
Observations and theoretical studies have demonstrated that the pulsed spectra of all gamma-ray pulsars terminate at energies below a few hundred GeV. In most cases we expect this cutoff energy Eo to be around 10 GeV. Only with nextgeneration ground-based γ-ray telescopes, which are expected to have non-zero trigger probabilities near 10 GeV, can we expect to detect pulsations. The large γ-ray ...
We have made a precise measurement of the inclusive jet cross section at √ s=1800 GeV. The result is based on an integrated luminosity of 92 pb −1 collected at the Fermilab Tevatron pp Collider with the DØ detector. The measurement is reported as a function of jet transverse energy (60 GeV ≤ ET ≤ 500 GeV), and in the pseudo-rapidity intervals |η| ≤ 0.5 and 0.1≤ |η| ≤0.7. A preliminary measureme...
Exclusive electroproduction of ρ mesons has been measured using the ZEUS detector at HERA in two Q ranges, 0.25 < Q < 0.85 GeV and 3 < Q < 30 GeV. The low-Q data span the range 20 < W < 90 GeV; the high-Q data cover the 40 < W < 120 GeV interval. Both samples extend up to four-momentum transfers of |t| = 0.6 GeV. The distribution in the azimuthal angle between the positron scattering plane and ...
We investigate the limits on the higgs mass in variations of Split Supersymmetry, where the boundary value of the Higgs quartic coupling at the SUSY breaking scale (ms) is allowed to deviate from its value in the minimal model of Arkani-Hamed and Dimopoulos. We show that it is possible for λ(ms) to be negative and use vacuum stability to put a lower bound on this coupling, and hence on the mass...
We present a nonperturbative dynamical study of μμ production in protonnucleus and nucleus-nucleus collisions at SPS energies on the basis of the covariant transport approach HSD. For p + W reactions at 200 GeV bombarding energy the dimuon yield for invariant masses m ≤ 1.6 GeV is found to be dominated by the decays of the η, ρ, ω and Φ mesons. For 200 GeV/A S + W collisions, however, the dimuo...
We examine the prospects for measuring the γγ branching fraction of a Standard Model-like Higgs boson with a mass of 120 GeV at the future TESLA linear e+e− collider, assuming an integrated luminosity of 1 ab−1 and center-of-mass energies of 350 GeV and 500 GeV. The Higgs boson is produced in association with a fermion pair via the Higgsstrahlung process e+e− → ZH, with Z → q q̄ or νν̄ , or the W...
A precision measurement of R will reduce the uncertainty on α(Mz), narrow the predicted mass window of Higgs boson mH and reduce the uncertainty on the anomalous magnetic moment of muon aμ. R has been measured in the energy region from hadron production threshold to Z pole. Previous R measurements below 5 Gev were carried out almost 20 years ago and the largest uncertainty on R comes from the m...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید