نتایج جستجو برای: full face cross section
تعداد نتایج: 1032914 فیلتر نتایج به سال:
We present a study of the reaction e+e−→π+π−π0 at the φ peak, W = M(φ) =1019.4 MeV, observed with the KLOE detector at DAΦNE. The reaction is dominated by φ production and decay, e+e−→φ→π+π−π0. From a fit to the Dalitz plot density distribution we obtain the ρ-meson parameters for its three charge states. We also find the relative amplitudes for φ→ρπ and φ→π+π−π0 and the cross section for e+e− ...
Drees and Godbole have proposed that, at the interaction point of an e+e− linear collider, one expects a high rate of hadron production by γγ collisions, providing an additional background to studies in e+e− annihilation. Using a simplified model of the γγ cross section with soft and jet-like components, we estimate the expected rate of these hadronic events for a variety of realistic machine d...
The propagator in the instanton background in the (−λφ4) scalar model in four dimensions is studied. Leading and sub-leading terms of its asymptotics for large momenta and its on-shell double residue are calculated analytically. These results are applied to the analysis of the initial-state and initial-final-state corrections and the calculation of the next-to-leading (propagator) correction to...
Deeply virtual Compton scattering has recently been studied by three HERA experiments, H1, ZEUS and HERMES, covering a broad range of kinematic regimes. We present cross section measurements of the two collider experiments in the kinematic region 2<Q<100 GeV and 30<W<140 GeV, and compare them to QCDbased calculations. HERMES measurements of azimuthal asymmetries and their kinematical dependence...
We present a study of the reaction e+e−→π+π−π0 at the φ peak, W = M(φ) =1019.4 MeV, observed with the KLOE detector at DAΦNE. The reaction is dominated by φ production and decay, e+e−→φ→π+π−π0. From a fit to the Dalitz plot density distribution we obtain the ρ-meson parameters for its three charge states. We also find the relative amplitudes for φ→ρπ and φ→π+π−π0 and the cross section for e+e− ...
The most recent measurements of the top quark mass at the DØ experiment are summarized. Different techniques and final states are used and the top quark mass is determined to be mtop = 172.8 ± 1.6(stat + syst)GeV/c . In addition, a new, indirect measurement comparing the measured cross section to theoretical calculations is discussed. Both, the direct and the indirect measurement of the top qua...
The impact of improved measurements of the cross section for electron-positron annihilation into hadrons in the charm threshold region is discussed. Two aspects are studied in detail: i.) A significant reduction of the experimental error of the electronic width of the narrow resonances J/ψ and ψ and of the continuum cross section from the open charm threshold up to 4.6 GeV will lead to a corres...
The two-gluon exchange model of the pomeron is used to compute the photoproduction reaction γp → Z0p. The predicted cross section is too small to be observed at HERA, but may be detectable at an eventual Next Linear Collider.
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