More than 30 years after the discovery of the J/ψ, its production mechanism is still poorly understood. With the LHC data it will be possible to study quarkonia up to very high transverse momenta and with high statistics. In this note we discuss experimental aspects of J/ψ and Υ(1S) production at the LHC. In particular, we investigate the sensitivity of a general purpose LHC detector to observa...

We present results for the top quark pair cross section at the Tevatron and the LHC. We use the resummed double differential cross section, employing the fully kinematicsdependent soft anomalous dimension matrices, to calculate the soft-gluon contributions at next-to-next-to-leading order (NNLO). We improve and update our previous estimates by refining our methods, including further subleading ...

The hard pomeron component needed to reproduce small-x data seems to be present in elastic scattering at moderate energy. If this is the case, it is likely that the total cross section at the LHC will be appreciably larger than previously expected. 1 The effective trajectory Historically, hadronic exchanges have been remarkably well described by the simple-pole model of Donnachie and Landshoff ...

Considering the large value of the top Yukawa coupling, we investigate the leading one-loop Yukawa electroweak corrections that can be induced by the top quark in a process such as Higgs production in association with a tagged bottom anti-bottom pair at the LHC. At NLO these contributions are found to be small at the LHC both for the total cross section and for the distributions. In the limit o...

We consider QCD corrections to Higgs boson production through gluon–gluon fusion in hadron collisions. Using the recently evaluated [14]two-loop amplitude for this process and the corresponding factorization formulae [15, 16, 17, 18] describing soft-gluon bremsstrahlung at O(α2 S), we compute the soft and virtual contributions to the next-to-next-to-leading order cross section. We also discuss ...

We present the first direct determination of the running top-quark mass based on the total cross section of top-quark pair-production as measured at the Tevatron. Our theory prediction for the cross section includes various next-to-next-to-leading order QCD contributions, in particular all logarithmically enhanced terms near threshold, the Coulomb corrections at two loops and all explicitly sca...

We present updated predictions for the total cross section of top-quark pair production at Tevatron and LHC. For the LHC we also provide results at √ s = 10 TeV, in view of the anticipated run in 2008 and quote numbers for the production of new heavy-quark pairs with mass in the range 0.5 – 2 TeV. Our two-loop results incorporate all logarithmically enhanced terms near threshold including Coulo...

I review various theoretical questions that arise from data from HERA and the Tevatron, and which are relevant for the LHC. They range from soft physics, such as the total cross section, to hard physics, such as Higgs production. In particular, I argue that the proton's gluon density is somewhat larger at small x than is currently accepted.

Using a recently proposed factorization hypothesis for semi-inclusive hard processes in QCD, one can study, in principle, the diiractive production of the Standard Model Higgs boson at LHC using only, as input, ep diiractive hard-processes data of the type recently collected and analyzed by the H1 and ZEUS collaborations at HERA. While waiting for a more precise and complete set of data, we com...

In the context of the Minimal Supersymmetric extension of the Standard Model, I discuss the effects of relatively light top and bottom scalar quarks on the main production mechanism of the lightest SUSY neutral Higgs boson h at the LHC, the gluon–gluon fusion mechanism gg → h, and on the most promising discovery channel, the two–photon decay mode h → γγ. In some areas of the parameter space, th...