Heavy-Flavor Production at Accelerators

I discuss heavy flavor production at hadronic facilities. I present total cross sections and differential distributions for top quark, bottom quark, and charm quark production at the Tevatron and LHC colliders, and at fixed-target experiments such as HERA-B. The calculations include complete next-to-leading order corrections as well as higher-order soft-gluon corrections which are important near kinematical threshold.Comment: 6 pages, 7 figures; invited talk at PANIC 2008, Eilat, Israel, November 9-14, 200

Resummation of next-to-leading logarithms in top quark production

We discuss the resummation of next-to-leading logarithms (NLL) in heavy quark production near threshold. Results are presented for top quark production at the Fermilab Tevatron.Comment: 9 pages, LaTeX, including one Postscript figure, Presented at the QCD 97 Euroconference, Montpellier, July 3-9, 1997, to appear in Nuclear Physics B Proceedings Supplemen

Understanding Bottom Production

We describe calculations of b b-bar production to next-to-next-to-leading order (NNLO) and next-to-next-to-leading logarithm (NNLL) near threshold in pp interactions. Our calculations are in good agreement with the b b-bar total cross section measured by HERA-B.Comment: contribution to the proceedings of Quark Matter'02, 4 pages, 1 .eps figure, uses special included style fil

W hadroproduction at large transverse momentum beyond next-to-leading order

We study the production of W bosons at large transverse momentum in p pbar collisions. We show that the next-to-leading order cross section at large transverse momentum is dominated by threshold soft-gluon corrections. We add next-to-next-to-leading-order soft-gluon corrections to the exact next-to-leading-order differential cross sections. We find that these higher-order corrections provide modest enhancements to the transverse momentum distribution of the W at the Tevatron, and reduce significantly the dependence on the factorization and renormalization scales.Comment: 17 pages, 8 figure

Charged Higgs production via bg -> tH- at the LHC

I present a calculation of QCD radiative corrections to charged Higgs production via the process bg -> tH-. I show that the cross section is dominated by soft-gluon corrections, which are computed through next-to-next-to-leading order. Results for charged Higgs production at the LHC are presented, including the dependence of the cross section on the charged Higgs mass, the top quark mass, the factorization and renormalization scales, and tan beta.Comment: 11 pages, 8 figure

Single top quark production at the Tevatron: threshold resummation and finite-order soft gluon corrections

I present a calculation of threshold soft-gluon corrections to single top quark production in ppbar collisions via all partonic processes in the t and s channels and via associated top quark and W boson production. The soft-gluon corrections are formally resummed to all orders, and finite-order expansions of the resummed cross section are calculated through next-to-next-to-next-to-leading order (NNNLO) at next-to-leading logarithmic (NLL) accuracy. Numerical results for single top quark production at the Tevatron are presented, including the dependence of the cross sections on the top quark mass and on the factorization and renormalization scales. The threshold corrections in the t channel are small while in the s channel they are large and dominant. Associated tW production remains relatively minor due to the small leading-order cross section even though the K factors are large.Comment: 24 pages, 19 figures; some changes and additional results; uncertainty in t channel corrected; to appear in Phys. Rev.

Top quark total and differential cross sections at NNLO and NNLL

I present recent NNLO-NNLL results for top quark hadroproduction at the Tevatron. The total cross section as well as transverse momentum and rapidity distributions are shown.Comment: 4 pages LaTeX, 2 figures; presented at DPF2000, to appear in the Proceeding

Theoretical status of the top quark cross section

We discuss the most recent calculations of the top quark total cross section and transverse momentum distributions at the Tevatron and the LHC. These calculations include the soft-gluon corrections at next-to-next-to-leading order (NNLO). The soft NNLO corrections stabilize the scale dependence of the cross section.Comment: 4 pages, 2 figures, presented at DPF 2004, Riverside, California, August 26-31, 200

Soft-gluon resummations and NNNLO expansions

I discuss the effectiveness of soft-gluon resummations in describing higher-order corrections. I present a comparison of recent resummation approaches and their relative successes in approximating complete NNLO corrections. I also discuss fixed-order expansions through NNNLO and present some recent applications to QCD hard-scattering processes, including top-antitop pair production, single-top production, and W production at large transverse momentum.Comment: 7 pages, 7 figures; presented at EPS-HEP 2013, Stockholm, Sweden, July 18-24, 201