We calculate the amplitude of gg → bb̄ production for the colour singlet, Jz = 0 di-gluon state at O(α2 S) order. We consider the cancellation, and a realistic cutoff, of the infrared divergent terms. We show that the one-loop radiative QCD contributions effectively reduce the Born level result for the central exclusive bb̄ cross section at the LHC. This process is essentially the only irreducibl...

Production of rare particles within rapidity gaps has been proposed as a background-free signal for the detection of new physics at hadron colliders. No complete formalism accounts for such processes yet. We study a simple lowestorder QCD model for their description. Concentrating on Higgs production, we show that the calculation of the cross section pp → ppH can be embedded into existing model...

In relativistic heavy ion collisions, top quarks can be produced by photongluon fusion when a photon from the Weizsäcker-Williams virtual photon field of one nucleus interacts with a gluon in the other nucleus. Photoproduction with heavy ions at the Large Hadron Collider (LHC) will be the first accessible non-hadronic top production channel. We calculate the tt photoproduction cross sections, p...

Article history: Received 16 February 2017 Received in revised form 2 June 2017 Accepted 21 August 2017 Available online 30 August 2017 Editor: M. Doser The production of opposite-charge W -boson pairs in proton–proton collisions at √ s= 13 TeV is measured using data corresponding to 3.16 fb−1 of integrated luminosity collected by the ATLAS detector at the CERN Large Hadron Collider in 2015. Ca...

We emphasize the importance of tagging the outgoing forward protons to sharpen the predictions for New Physics at the LHC (such as the diffractive production of a light Higgs boson). The rescattering effects lead to a rich distinctive structure of the cross section as a function of the transverse momenta of the protons. We show that a study of the correlations between the proton transverse mome...

A brief overview of physics analyses being conducted at Fermilab's Tevatron collider is presented. Selected topics from electroweak and QCD jet analyses undertaken by the D and CDF Collaborations are discussed, with an emphasis on those analyses which probe the possible substructure of the Standard Model. In particular, recent results in the inclusive jet production cross section and dijet angu...

We derive the cross section for the diffractive gluon production in high energy onium-nucleus collisions that includes the low-x evolution effects in the rapidity interval between the onium and the produced gluon and in the rapidity interval between the gluon and the target nucleus. We analyze our result in two limiting cases: when the onium size is much smaller than the saturation scale and wh...

We discuss aspects of open and hidden charm production in deuterium-nucleus collisions at RHIC and LHC energies. We describe calculations of the total cc cross section and the charm quark transverse momentum distributions. We next explain how shadowing and moderate nuclear absorption can explain the PHENIX J/ψ dAu/pp ratios and predict the combined effect of shadowing and absorption in 6.2 TeV ...

We consider a highly unconventional approach to generating muon and antimuon bunches for a neutrino factory or muon collider: electronpositron annihilation just above muon-antimuon threshold. This approach can produce low-emittance bunches at high energy, easing the muoncooling and acceleration challenges in such facilities. However, the small (< 1μb) useable production cross section means that...

I discuss and compare several approaches to higher-order calculations of top quark production. I study the relative effectiveness of the approaches in approximating the exact NNLO results for the top-pair total cross section and highlight the theoretical and numerical differences between them. I show that the results from my soft-gluon resummation method are nearly identical to the exact NNLO c...