NNLL Threshold Resummation for Top-pair and Single-top Production
نویسنده
چکیده
I discuss threshold resummation at NNLL accuracy in the standard moment-space approach in perturbative QCD for top-pair and single-top production. For top quark pair production I present new approximate NNLO results for the total cross section and for the top quark transverse momentum and rapidity distributions at 8 TeV LHC energy. I discuss the accuracy of the soft-gluon approximation and show that the NLO and NNLO approximate results from resummation are practically indistinguishable from exact NLO and partial NNLO results. For single top production I present new approximate NNLO results for the total cross sections in all three channels at the LHC and also for the top quark transverse momentum distributions in t-channel production and in top-quark associated production with a W boson. For both tt̄ and single-top production the agreement of theoretical results with LHC and Tevatron data is excellent.
منابع مشابه
Higher-order Corrections to Top-antitop Pair and Single Top Quark Production
The top quark plays an important role in the Standard Model of particle physics as the most massive elementary particle, relevant to electroweak physics. The top was discovered via pair production [1, 2] and has also been more recently produced via single top [3, 4] channels at the Tevatron. On the theoretical side, QCD corrections are significant for top quark production and even higherorder c...
متن کاملNext-to-Next-to-Leading Logarithm Resummation for S-Channel Single Top Quark Production
I present the next-to-next-to-leading-logarithm (NNLL) resummation of soft and collinear gluon corrections to single top quark production in the s channel. Attaining NNLL accuracy involves the calculation of the two-loop soft anomalous dimension for the partonic subprocesses. Finite-order expansions of the resummed cross section are calculated through next-to-next-to-leading order (NNLO). Numer...
متن کاملTop Quark Cross Sections and Differential Distributions
I present results for the top quark pair total cross section and the top quark transverse momentum distribution at Tevatron and LHC energies. I also present results for single top quark production. All calculations include NNLO corrections from NNLL threshold resummation. TOP-ANTITOP PAIR PRODUCTION The leading order processes for top-antitop pair production are qq̄ → tt̄ (dominant at the Tevatro...
متن کاملTop-quark Transverse-momentum Distributions in T-channel Single-top Production
I present approximate next-to-next-to-leading-order (NNLO) top-quark transverse momentum, pT , distributions in t-channel single-top production. These distributions are derived from next-to-next-to-leading-logarithm (NNLL) soft-gluon resummation. Theoretical results for the single top as well as the single antitop pT distributions are shown for LHC and Tevatron energies.
متن کاملSingle-top Transverse-momentum Distributions at Approximate NNLO
I present approximate next-to-next-to-leading-order (aNNLO) transverse-momentum (pT ) distributions in single-top production processes. The aNNLO results are derived from next-to-next-to-leading-logarithm (NNLL) resummation of soft-gluon corrections in the differential cross section. Single-top as well as single-antitop pT distributions are shown in t-channel, s-channel, and tW production for L...
متن کامل