نتایج جستجو برای: photon collision
تعداد نتایج: 116904 فیلتر نتایج به سال:
OBJECTIVE To determine whether pedestrian countdown signals (PCS) reduce pedestrian-motor vehicle collisions in the city of Toronto, Canada. METHODS A quasi-experimental study design was used to evaluate the effect of PCS on the number of pedestrian-motor vehicle collisions in the city of Toronto, from January 2000 to December 2009. Each intersection acted as its own control. We compared the ...
We calculate total and differential cross sections for sfermion production in e+e− annihilation and in photon-photon collisions with arbitrary photon polarization. The total cross section at a polarized photon collider is shown to be larger than the e+e− annihilation cross section up to the kinematic limit of the photon collider.
Experimental data on the polarization of hyperons, inclusively produced in hadron-hadron collisions, have been analyzed. It is shown that the existing data can be described by a function of transverse momentum (p T) and two scaling variables x A± = (x R ± x F)/2: P H = A α F (p T)[G(x A+ − x 2) − σG(x A− + x 2)]. The function G(x A+) is proportional to sin[ω(x A+ −x 1)]/ω, which results for som...
We provide complete analytic expressions for the inclusive prompt photon production cross section in hadronic final states of e+e− annihilation reactions through one-loop order in quantum chromodynamics perturbation theory. Computed explicitly are direct photon production through first order in the electromagnetic strength αem and the quark-to-photon and gluon-tophoton fragmentation contributio...
We show that new physics effects due to extra dimensions can dramatically affect Higgs pair production at photon colliders. We find that the cross section due to extra dimensions with the scale MS of new physics around 1.5 TeV, the cross section can be as large as 0.11 pb (1.5pb) for monochromatic photon collision, γγ → HH, with the collider energy √ s = 0.5(1) TeV for Higgs mass of 100 (350) G...
We provide complete analytic expressions for the isolated prompt photon production cross section in e+e− annihilation reactions through one-loop order in quantum chromodynamics (QCD) perturbation theory. Functional dependences on the isolation cone size δ and isolation energy parameter are derived. The energy dependence as well as the full angular dependence of the cross section on θγ are displ...
Direct photons are a unique probe of the hot and dense matter created at RHIC: they allow access to the initial, thermalized state of the collision. Their measurement, however, is challenging. One has to cope with a large background from hadronic decays. Direct photon measurements in p + p constrain the hard-scattering contribution in Au+Au. A comparison to d+Au allows to quantify contributions...
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