### Conveners

#### 09 - Progress in Lattice Techniques and New Results

- Pilar Hernandez (University of Valencia)

#### 09 - Progress in Lattice Techniques and New Results

- Sinya Aoki (University of Tsukuba)

#### 09 - Progress in Lattice Techniques and New Results

- Shoji Hashimoto (High Energy Accelerator Research Organization (KEK))

#### 09 - Progress in Lattice Techniques and New Results

- Benoit Blossier (LPT Orsay)

Stefan Schaefer
(Humboldt University Berlin)

7/23/10, 9:00 AM

09 - Progress in Lattice Techniques and New Results

Parallel Session Talk

Ab-initio studies of the physics of pions using lattice QCD have become possible over the last decade, where particular attention was given to the computation of the constants of the chiral Lagrangian. This is due to significant progress in algorithms, which now allow simulations with light sea quarks on fine lattices. This talk has two objectives: the first is to introduce the ideas behind...

Takashi Kaneko
(KEK)

7/23/10, 9:35 AM

09 - Progress in Lattice Techniques and New Results

Parallel Session Talk

Disconnected diagrams give crucial contributions to the physics of flavor singlet hadrons and to scalar form factors of non-singlet hadrons. Lattice calculation of the disconnected diagrams is not straightforward because naively it requires huge number of fermion matrix inversions. In this talk, we present recent progress with improved simulation methods particularly focusing on the...

Dr
Dru Renner
(DESY, Zeuthen)

7/23/10, 10:00 AM

09 - Progress in Lattice Techniques and New Results

Parallel Session Talk

The nonperturbative calculation of the hadronic contributions to the anomalous magnetic moment of the muon is an interesting challenge for QCD, especially in light of the continuing discrepancy between the Standard Model prediction and experimental measurements. We have calculated the leading order hadronic contribution using lattice QCD with pion masses ranging from 600 MeV down to 300 MeV....

Owe Philipsen

7/23/10, 11:00 AM

09 - Progress in Lattice Techniques and New Results

Parallel Session Talk

The QCD phase diagram as a function of temperature and chemical potential for baryon number is largely unknown. Straightforward Monte Carlo simulations of lattice QCD are prohibited by the so-called sign problem for systems with a non-vanishing net baryon number. After a brief introduction to the origin of the sign problem, I review some recent computational techniques valid for sufficiently...

George Fleming
(Yale University)

7/23/10, 11:35 AM

09 - Progress in Lattice Techniques and New Results

Parallel Session Talk

One of the important missions of LHC is to probe the mechanism behind the electroweak symmetry breaking through which elementary particles, such as the W and Z gauge bosons and the quarks, acquire mass. While the most economical solution is to have the Standard Model Higgs mechanism, other possibilities exist. One such possibility is to have dynamical electroweak symmetry breaking (DEWSB) as a...

390.
Effects of a potential fourth fermion generation on the upper and lower Higgs boson mass bounds

Dr
Philipp Gerhold
(Humboldt-University Berlin)

7/23/10, 12:05 PM

09 - Progress in Lattice Techniques and New Results

Parallel Session Talk

We study the effect of a potential fourth fermion generation on the upper and lower Higgs boson mass bounds. This investigation is based on the numerical evaluation of a chirally invariant lattice Higgs-Yukawa model emulating the same Higgs-fermion coupling structure as in the Higgs sector of the electroweak Standard Model. In particular, the considered model obeys a Ginsparg-Wilson version of...

Prof.
Sinya Aoki
(University of Tsukuba)

7/23/10, 2:00 PM

09 - Progress in Lattice Techniques and New Results

Parallel Session Talk

I review the recent progress on the determination of potentials between baryons from lattice QCD, based on works by HAL (Hadron to Atomic nuclei from Lattice) QCD Collaboration, who uses the Bethe-Salpter amplitudes to extract potentials in quantum field theories. The method is first applied to two nucleons on the lattice with quenched QCD simulations. By disentangling the mixing between the...

Prof.
Colin Morningstar
(Carnegie Mellon University)

7/23/10, 2:30 PM

09 - Progress in Lattice Techniques and New Results

Parallel Session Talk

Progress in determining the spectrum of excited baryons and mesons in lattice QCD is described. Large sets of carefully-designed hadron operators have been studied and their effectiveness in facilitating the extraction of excited-state energies is demonstrated. A new method of stochastically estimating the low-lying effects of quark propagation is proposed which will allow reliable...

Constantia Alexandrou
(University of Cyprus)

7/23/10, 2:55 PM

09 - Progress in Lattice Techniques and New Results

Parallel Session Talk

We present recent results on the nucleon form factors and low moments of generalized parton districbutions. They are obtained using two degenerate flavors of dynamical twisted mass fermions corresponding to pion masses in the range of about 260-450 MeV. Finite volume and cut-off effects are investigated. Chiral extrapolations of the magnetic moment, Pauli and Dirac radii and the axial charge...

jose Rodriguez-Quintero
(University of Huelva)

7/23/10, 3:20 PM

09 - Progress in Lattice Techniques and New Results

Parallel Session Talk

QCD is believed to be the theory of the strong interactions with, as only inputs, one mass parameter for each quark species and the value of the QCD coupling constant at some energy or momentum scale in some renormalization scheme. This is Lambda_QCD, the only non-perturbative parameter in the limit of massless quarks, to be taken from experiment, and the one which expresses the scale of...

Dr
Enno E. Scholz
(University of Regensburg)

7/23/10, 4:15 PM

09 - Progress in Lattice Techniques and New Results

Parallel Session Talk

Quantum Chromodynamics with two mass degenerate light quark flavors and an additional single heavier quark flavor has been simulated on the lattice using the domain wall fermion formulation. These simulations cover a range of dynamical pion masses between 300 and 420 MeV and were performed at two different values for the lattice spacing with 1/a=1.73 and 2.32 GeV and a linear lattice extent of...

Dr
Michele Della Morte
(Institut fuer Kernphysik, Mainz)

7/23/10, 4:45 PM

09 - Progress in Lattice Techniques and New Results

Parallel Session Talk

We review the most recent lattice results on a few selected hadronic quantities and discuss some recent theoretical development. We try to put the emphasis on the challenges, which have to be faced, on the way to precise heavy flavour physics on the lattice.

Dr
Elvira Gamiz
(Fermilab)

7/23/10, 5:15 PM

09 - Progress in Lattice Techniques and New Results

Parallel Session Talk

Heavy quark quantities are useful for testing lattice techniques against well known experimental results, as well as for testing the Standard Model (SM) itself, and searching for physics beyond the SM. I will review the results of recent lattice calculations relevant for this program including those of B and D decay constants and semileptonic decay form factors, and neutral B mixing. The...

Dr
Igor Bogolubsky
(JINR)

7/23/10, 5:45 PM

09 - Progress in Lattice Techniques and New Results

Parallel Session Talk

Considerable efforts have been devoted during the last decade to exploring QCD's elementary two-point functions using the framework of lattice QCD. Thereby, much attention has been paid to the gluon and ghost propagators in Landau gauge whose low-momentum behavior has been explored using relatively coarse lattices to reach momenta as low as possible. To ultimately confront such lattice results...