Direct Photons in E+e-annihilation*

Inclusive prompt photon production in hadronic final states of e+e- annihilation.

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...

Local Annihilation Method ‎and‎ Some Stiff ‎Problems

In this article‎, ‎a new scheme inspired from collocation method is‎ ‎presented for numerical solution of stiff initial-value problems and Fredholm integral equations of the first kind based on the derivatives of residual function‎. ‎Then‎, ‎the error analysis‎ ‎of this method is investigated by presenting an error bound‎. ‎Numerical comparisons indicate that the‎ ‎presented method yields accur...

Next-to-leading-log renormalization-group running in heavy-quarkonium creation and annihilation

In the framework of potential NRQCD, we obtain the next-to-leading-log renormalization-group running of the matching coefficients for the heavy quarkonium production currents near threshold. This allows to obtain S-wave heavy-quarkonium production/annihilation observables with next-to-leadinglog accuracy within perturbative QCD. In particular, we give expressions for the decays of heavy quarkon...

Inclusive vector charmonium production in two-photon e + e −-annihilation at √ s = 10.6 GeV

Sfermion production at photon colliders

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.