289 research outputs found
Next-to-Leading-Order Corrections to the Production of Heavy-Flavour Jets in e+e- Collisions
In this paper we describe the calculation of the process e+e- -> Z/gamma ->
QQbar + X, where Q is a heavy quark, at order alpha_s^2.Comment: 49 pages, Latex, epsfig, 6 figures. Tables 2 and 3 labels and
captions have been fixe
On the Fragmentation Function for Heavy Quarks in e+e- collisions
We use a recent O(alpha_s^2) calculation of the differential cross section
for the production of heavy quarks in e+e- annihilation to compute a few
moments of the heavy quark single-inclusive production cross section. We verify
that, contrary to some recent claims, the leading and next-to-leading
logarithmic terms in this cross section are correctly given by the standard NLO
fragmentation function formalism for heavy quark production.Comment: 14 pages, Latex, epsfig, 4 figure
Next-to-leading order QCD corrections to W+Z and W-Z production via vector-boson fusion
We present the calculation of the next-to-leading order QCD corrections to
electroweak p p -> e+ nu_e mu+ mu- jj and p p -> e- nubar_e mu+ mu- jj
production at the CERN LHC in the form of a fully flexible parton-level Monte
Carlo program. The QCD corrections to the total cross sections are modest,
changing the leading-order results by less than 10%. At the Born level, the
shape of kinematic distributions can depend significantly on the choice of
factorization scale. This theoretical uncertainty is strongly reduced by the
inclusion of the next-to-leading order QCD corrections.Comment: 15 pages, 6 figures; new figure and comments added; version published
by PR
Higgs + 2 jets via gluon fusion
Real emission corrections to gg -> H, which lead to H+2 jet events, are
calculated at order alpha_s^4. Contributions include top-quark triangles, boxes
and pentagon diagrams and are evaluated analytically for arbitrary top mass
m_t. This new source of H+2 jet events is compared to the weak-boson fusion
cross section for a range of Higgs boson masses. The heavy top-mass
approximation appears to work well for intermediate Higgs-boson masses,
provided that the transverse momenta of the final-state partons are smaller
than the top-quark mass.Comment: 8 pages, 3 figure
- …