Mon·Oct 4, 2004Monday·October 4, 2004

1. 01*

   The Dual Meissner Effect and Magnetic Displacement Currents

   Tsuneo Suzuki🇯🇵 · Katsuya Ishiguro🇯🇵 · Yoshihiro Mori🇯🇵 · Toru Sekido🇯🇵

   The dual Meissner effect is observed without monopoles in quenched $SU(2)$ QCD with Landau gauge-fixing. Magnetic displacement currents which are time-dependent Abelian magnetic fields play a role of solenoidal currents squeezing Abelian electric fields. Monopoles are not always necessary to the dual Meissner effect. The squeezing of the electric flux means the dual London equation and the massiveness of the Abelian electric fields as an asymptotic field. The mass generation of the Abelian electric fields is related to a gluon condensate $<A_{\mu }^a{A}_{\mu }^a>\ne 0$ of mass dimension 2.

   hep-lathep-phhep-thPRL(2005)·46 citations
2. 02*

   Progress on a canonical finite density algorithm

   Andrei Alexandru🇺🇸 · Manfried Faber🇦🇹 · Ivan Horváth🇺🇸 · Keh-Fei Liu🇺🇸

   We test the finite density algorithm in the canonical ensemble which combines the HMC update with the accept/reject step according to the ratio of the fermion number projected determinant to the unprojected one as a way of avoiding the determinant fluctuation problem. We report our preliminary results on the Polyakov loop in different baryon number sectors which exhibit deconfinement transitions on small lattices. The largest density we obtain around $T_c$ is an order of magnitude larger than that of nuclear matter. From the conserved vector current, we calculate the quark number and verify that the mixing of different baryon sectors is small.

   hep-latNucl.Phys.B Proc.Suppl.(2005)·7 citations
3. 03*

   Thermal Phase Transition in the NJL Model of QCD

   C.G. Strouthos🇨🇾

   We present results from numerical studies of the NJL model with two massless quarks at nonzero temperature. We show that the model undergoes a second order chiral phase transition which belongs to the 3d O(4) spin model universality class.

   hep-lathep-phnucl-thNPA(2005)·2 citations
4. 04*

   Perturbative QCD Potential and String Tension

   Y. Sumino🇯🇵

   The leading non-perturbative contribution to the static QCD potential at r << 1/Lambda_QCD is known to be O(r^2) in operator-product expansion. It indicates that a "Coulomb+linear" potential at r <~ 1/Lambda_QCD is included in the perturbative QCD prediction of the potential. It was shown that this is indeed the case, and the "Coulomb+linear" potential has been systematically computed up to next-to-next-to-leading logarithmic order, in terms of the Lambda parameter in the MSbar scheme (Lambda_MSbar). We review the present status of the perturbative prediction for the QCD potential, which takes into account the theoretical breakthrough that took place around 1998.

   ↳ hep-phhep-lat2 citations
5. 05*

   The large $N$ limit from the lattice

   Biagio Lucini🇨🇭

   A numerical study of the string tension and of the masses of the lowest-lying glueballs is performed in SU($N$) gauge theories for $2\le N\le 8$ in D=3+1 and $2\le N\le 6$ in D=2+1. It is shown that for the string tension a smooth $N\to \infty$ limit exists that depends only on the 't Hooft coupling $\lambda =g^{2}N$. An extrapolation of the masses of the lightest glueballs to $N=\infty$ using a power series in $1/N^2$ shows that the leading correction to the infinite $N$ value accounts for finite $N$ effects for $N$ at least as small as 3 and all the way down to N=2 in many cases. $k$-string tension ratios and possible issues connected with correlation functions at large $N$ are also discussed.

   ↳ hep-phhep-lathep-thFew Body Syst.(2005)·10 citations
6. 06*

   Helicity Dependent and Independent Generalized Parton Distributions of the Nucleon in Lattice QCD

   Ph. Hagler🇳🇱 · J.W. Negele🇺🇸 · D.B. Renner🇺🇸 · W. Schroers🇺🇸 · T. Lippert🇩🇪 · K. Schilling (LHP Collaboration)🇩🇪

   A complete description of the nucleon structure in terms of generalized parton distributions (GPDs) at twist 2 level requires the measurement/computation of the eight functions H, E, \tilde H, \tilde E, H_T, E_T, \tilde H_T and \tilde E_T, all depending on the three variables x, \xi and t. In this talk, we present and discuss our first steps in the framework of lattice QCD towards this enormous task. Dynamical lattice QCD results for the lowest three Mellin moments of the helicity dependent and independent GPDs are shown in terms of their corresponding generalized form factors. Implications for the transverse coordinate space structure of the nucleon as well as the orbital angular momentum (OAM) contribution of quarks to the nucleon spin are discussed in some detail.

   ↳ hep-phhep-latEPJA(2005)·31 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.