DPF 2009

Session

QCD II

31 Jul 2009, 14:00

Wayne State University

10. New limit of pion form factor at very large $Q^2$

Bing An Li (University of Kentucky)

31/07/2009, 14:00

Perturbative and Non-perturbative QCD

\documentclass[12pt]{article} \usepackage{graphicx} \def\today{} \textwidth 18.3cm \textheight 23.2cm \setlength{\oddsidemargin}{-1.0cm} \setlength{\evensidemargin}{-1.0cm} \topmargin -1.50cm \begin{document} \title{New limit of Pion Form Factor at very Large $Q^2$ } \author{Bing An Li,$\;$Department of Physics, Univ. of Kentucky, Lexington,USA} \maketitle In this talk a new...

45. The strange quark condensate in the nucleon in 2+1 flavor QCD

doug toussaint (University of Arizona)

31/07/2009, 14:25

Perturbative and Non-perturbative QCD

We use lattice gauge theory including the effects of light and strange dynamical quarks to calculate the "strange quark content of the nucleon", <N| s s_bar |N>, which is important for interpreting the results of some dark matter detection experiments. The method is to evaluate quark-line disconnected correlations on the MILC lattice ensembles, which include the effects of dynamical...

93. Recent results on two-photon physics at BABAR

Prof. Mike Sokoloff (University of Cincinnati)

31/07/2009, 14:50

Perturbative and Non-perturbative QCD

Two-photon processes produced at e+e- colliders via the reaction e+ e- --> e+ e- gamma gamma(*) --> e+ e- X, provide important experimental data for the study of hadronic spectra and testing QCD predictions. We report here on recent results in a number of these channels that are obtained at the PEP-II collider with the BABAR detector. The gamma gamma --> pi0pi0, pi0eta, and etaeta cross...

263. Renormalon subtraction from the average plaquette and the gluon condensate

Taekoon Lee (Kunsan National University)

31/07/2009, 15:15

Perturbative and Non-perturbative QCD

We show that the Borel resummed perturbative contribution of the stochastic perturbation theory and dimension-4 gluon condenstate can acccount for the average plaquette data, and the resulting gluon condensate of the $\text{SU}(3)$ pure Yang-Mills theory is determined to be $\langle \frac{\alpha_s}{\pi} GG \rangle\approx0.13\,\, {\rm GeV}^4$. A critical review of the existing procedure...

275. Optimal spin-quantization axes for the polarizations of dileptons and quarkonium with large transverse momentum

Daekyoung Kang (The Ohio State University)

31/07/2009, 15:40

Perturbative and Non-perturbative QCD

The leading-order parton processes that produce a dilepton with large transverse momentum predict that the transverse polarization should increase with the transverse momentum for almost any choice of the quantization axis for the spin of the virtual photon. The rate of approach to complete transverse polarization depends on the choice of spin quantization axis. We propose axes that optimize...

331. Computation of the string tension in Yang-Mills theory using large N reduction

Prof. Joe Kiskis (UC Davis)

31/07/2009, 16:30

Perturbative and Non-perturbative QCD

Continuum reduction and Monte Carlo simulation are used to calculate the heavy quark potential and the string tension in large N Yang-Mills theory in three and four dimensions in the confined phase. In addition, the spatial string tension in the 2+1 high T phase is also measured. With reduction, the potential can be calculated out to separations larger than the lattice extent.

344. Improving the precision of light quark mass determinations

Christian Sturm (Brookhaven National Laboratory)

31/07/2009, 16:55

Perturbative and Non-perturbative QCD

Quark masses are fundamental parameters of QCD. Their accurate determination is thus a mandatory task. Light quark masses can be determined non-perturbatively through lattice simulations in a given renormalization scheme, e.g. a momentum subtraction scheme. The MSbar scheme is not directly amenable in lattice simulations since it is closely related to dimensional regularization. To obtain...