The H1 and ZEUS combined data set on Neutral Current (NC) and Charged Current (CC) ep and ep inclusive cross sections is used as the input for next-to-leading order (NLO) and next-to-next-to-leading order (NNLO) QCD parton density function (PDF) fits resulting in a new preliminary PDF set called HERAPDF2.0 (prel.). The analysis yields small experimental uncertainties and includes estimates for ...

The next-to-next-to-leading order (NNLO) non-singlet QCD analysis of the experimental data of the CCFR collaboration of Ref.[1] for the xF3 and F2 structure functions of the deep-inelastic scattering of neutrinos and antineutrinos on the nucleon by means of the Jacobi polynomial expansion method is made. The target mass corrections are also taken into account. We demonstrate that the NNLO corre...

We consider top-anti-top production near threshold in e+e− collisions, resumming Coulomb-enhanced corrections at next-to-next-to-leading order (NNLO). We also sum potentially large logarithms of the small top quark velocity at the next-toleading logarithmic level using the renormalization group. The NNLO correction to the cross section is large, and it leads to a significant modification of the...

We compute 2-loop QCD corrections to the hard coefficient functions which arise in the factorization formula for B → Xulν decays in the shape-function region. Our calculation provides the last missing piece required for a NNLO analysis of inclusive semileptonic B decays, which may significantly reduce the theoretical uncertainty in the extraction of the CKM matrix element |Vub|. Among the techn...

The contributions of virtual corrections and soft gluon emission to the inclusive Higgs boson production cross section pp → H +X are computed at next-to-next-to-leading order in the heavy top quark limit. We show that this part of the total cross section is well behaved in the sense of perturbative convergence, with the NNLO corrections amounting to an enhancement of the NLO cross section by ∼ ...

We review the theoretical ideas and tools required to arrive at a next-to-next-to-leading order (NNLO) description of the heavy quark-antiquark production cross section in e + e − annihilation for the case that the center of mass kinetic energy of the quarks is larger than Λ QCD. In this case the NNLO cross section can be calculated with purely perturbative methods. We present details of the ca...

I describe harmonic-oscillator-based effective theory (HOBET) and explore the extent to which the effects of excluded higher-energy oscillator shells can be represented by a contact-gradient expansion in next-to-next-to-leading order (NNLO). I find the expansion can be very successful provided the energy dependence of the effective interaction, connected with missing long-wavelength physics ass...

We calculate threshold soft-gluon corrections to total cross sections and transverse momentum distributions for bottom and charm quark production in fixed-target experiments, considering both pp and π−p interactions. We investigate the quality of the near threshold soft-gluon approximation at next-to-leading order (NLO) and calculate next-to-nextto-leading order (NNLO) corrections through next-...

We have developed a subtractive renormalization method with which we can evaluate nucleonnucleon (NN) scattering phase shifts produced by the NN potential obtained at leading, nextto-leading, and next-to-next-to-leading order (NNLO) in chiral effective theory (χET). In this method the low-energy constants associated with short-distance NN physics are eliminated from the Lippmann-Schwinger equat...