C. P. Yuan

New parton distribution functions from a global analysis of quantum chromodynamics

Here, we present new parton distribution functions (PDFs) up to next-to-next-to-leading order (NNLO) from the CTEQ-TEA global analysis of quantum chromodynamics. These differ from previous CT PDFs in several respects, including the use of data from LHC experiments and the new D0 charged lepton rapidity asymmetry data, as well as the use of more flexible parametrization of PDFs that, in particular, allows a better fit to different combinations of quark flavors. Predictions for important LHC processes, especially Higgs boson production at 13 TeV, are presented. These CT14 PDFs include a central set and error sets in the Hessian representation. For completeness, we also present the CT14 PDFs determined at the leading order (LO) and the next-to-leading order (NLO) in QCD. Besides these general-purpose PDF sets, we provide a series of (N)NLO sets with various αs values and additional sets in general-mass variable flavor number (GM-VFN) schemes, to deal with heavy partons, with up to 3, 4, and 6 active flavors.

CT10 next-to-next-to-leading order global analysis of QCD

Jun Gao, Marco Guzzi, Joey Huston, Hung-Liang Lai, Zhao Li, Pavel Nadolsky, Jon Pumplin, Daniel Stump, and C.–P. Yuan 6 1 Department of Physics, Southern Methodist University, Dallas, TX 75275-0181, USA 2 Deutsches Elektronensynchrotron DESY, Notkestrasse 85 D-22607 Hamburg, Germany 3 Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-1116, USA 4 Taipei Municipal University of Education, Taipei, Taiwan 5 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China 6 Center for High Energy Physics, Peking University, Beijing 100871, China Abstract We present next-to-next-to-leading order (NNLO) parton distribution functions (PDFs) from the CTEQ-TEA group. The CT10NNLO PDF fit is based on essentially the same global data sets used in the CT10 and CT10W NLO PDF analyses. After exploring the goodness of the fits to the HERA combined data and the Tevatron jet data, we present various predictions at NNLO accuracy for both existing and forthcoming precision measurements from the CERN Large Hadron Collider. The range of variations in the gluon distribution introduced by correlated systematic effects in inclusive jet production is also examined.

Tevatron Run-1

We examine the effect of the Z-boson transverse momentum distribution measured at the Run-1 of the Tevatron on the nonperturbative function of the Collins-Soper-Sterman (CSS) formalism, which resums large logarithmic terms from multiple soft gluon emission in hadron collisions. The inclusion of the Tevatron Run-1 Z-boson data strongly favors a Gaussian form of the CSS nonperturbative function, when combined with the other low energy Drell-Yan data in a global fit.

Z

We consider the Collins-Soper-Sterman resummation formalism, which describes the vector boson transverse momentum

boson data and Collins-Soper-Sterman resummation formalism

{(Q}_{T})

Soft gluon effects on lepton pairs at hadron colliders

distribution at hadron colliders, and extend it for the distributions of the decay leptons by correctly including the effects of the polarization and the width of the vector boson. Numerous aspects of the formalism are reviewed at the

Single top quark production as a window to physics beyond the standard model

O({\ensuremath{\alpha}}_{S}^{2})

Uncertainty induced by QCD coupling in the CTEQ global analysis of parton distributions

level, including the matching of the

Fermilab Tevatron run-1Zboson data and the Collins-Soper-Sterman resummation formalism

{Q}_{T}

Heavy Quark Mass Effects in Deep Inelastic Scattering and Global QCD Analysis

distribution and the value of the total cross section. Detailed comparisons of several