Fri·Sep 5, 2003Friday·September 5, 2003

1. 01*

   Baryon Decuplet to Octet Electromagnetic Transitions in Quenched and Partially Quenched Chiral Perturbation Theory

   Daniel Arndt🇺🇸 · Brian C. Tiburzi🇺🇸

   We calculate baryon decuplet to octet electromagnetic transition form factors in quenched and partially quenched chiral perturbation theory. We work in the isospin limit of SU(3) flavor, up to next-to-leading order in the chiral expansion, and to leading order in the heavy baryon expansion. Our results are necessary for proper extrapolation of lattice calculations of these transitions. We also derive expressions for the case of SU(2) flavor away from the isospin limit.

   hep-lathep-phnucl-thPRD(2004)·47 citations
2. 02*

   Pressure and non-linear quark number susceptibilities in QCD

   R.V. Gavai🇮🇳 · Sourendu Gupta🇮🇳

   We report the first measurements of sixth order non-linear quark number susceptibilities in continuum QCD. This extends our earlier computation of the continuum limit of non-linear quark number susceptibilities and the pressure in QCD for m/Tc=0.1. For T/Tc > 1.5, no phase transitions are observable for mu<30T. Systematics of off-diagonal susceptibilities are reported. The equation of state in the high temperature phase of the QCD plasma is constructed.

   hep-lathep-phnucl-thNucl.Phys.B Proc.Suppl.(2004)·7 citations
3. 03*

   Vector and Axial-Vector Propagators in the \epsilon-Regime of QCD

   P.H. Damgaard🇩🇰 · P. Hernandez🇨🇭 · K. Jansen🇩🇪 · M. Laine🇩🇪 · L. Lellouch🇫🇷

   Using quenched and unquenched chiral perturbation theory we compute vector and axial current two-point functions at finite volume and fixed gauge field topology, in the so-called \epsilon-regime of QCD. A comparison of these results with finite volume lattice calculations allows to determine the parameters of the corresponding chiral Lagrangians.

   hep-latNucl.Phys.B Proc.Suppl.(2004)·3 citations
4. 04*

   Perturbative Check of the Action and Energy Lattice Sum Rules

   B. Feuerbacher🇩🇪

   Lattice sum rules are checked using lattice perturbation theory. The action sum rule gives a relation between the quark-antiquark potential, its logarithmic derivative with respect to distance and the expectation value of the action; the energy sum rule expresses the potential as the sum of the energy in the gluon fields and of an anomalous term. Two different independent calculations of the quark-antiquark potential are presented, and the transversality of the gluonic vacuum polarization on the lattice is proven. The crucial part of the action sum rule is an identity whose explicit check using perturbation theory provides methods and results which are useful for checking the energy sum rule. Additionally, the gauge invariance of the expectation value of the Wilson loop up to next-to-leading order is proven. The possibility of restricting the expectation value of the action to one fixed time slice is discussed. The energy sum rule is checked perturbatively up to next-to-leading order and shown to be satisfied with good numerical accuracy. The various contributions to the quark-antiquark potential are analyzed, and the restriction of the expectation value of the sum over all spatial plaquettes (the energy in the magnetic fields) to one fixed time slice is examined.

   hep-lat2 citations
5. 05*

   Universality and scaling behavior of RG gauge actions

   Silvia Necco🇩🇪

   We study universality and scaling properties of RG gauge actions (Iwasaki and DBW2). In the first part we consider the critical temperature T_{c} and compute the reference energy scale r_{0} for critical couplings \beta_{c} corresponding to N_{t}=3,4,6,8. The universality of T_{c}r_{0} between Iwasaki and Wilson action is confirmed and the scaling behavior of the Iwasaki action is found to be better than the one for the Wilson action. The results for the DBW2 action show larger lattice artefacts. A continuum value T_{c}r_{0}=0.7498(50) is extracted. We compute also the glueball masses for the states 0^{++} and 2^{++}, investigate the scaling of m_{0^{++}}r_{0} and m_{2^{++}}r_{0} and point out practical problems which are due to the violation of positivity present in the RG actions.

   hep-latNPB(2004)·58 citations
6. 06*

   Energy-entropy study of projected space-like monopoles in finite-T quenched SU(2) QCD

   Tsuneo Suzuki🇯🇵 · M. N. Chernodub🇷🇺 · Katsuya Ishiguro🇯🇵

   Properties of space-like monopoles projected on the 3D space in finite temperature quenched SU(2) QCD are studied. The monopole energy is derived from the effective action of the monopoles which is determined by an inverse Monte-Carlo method. Then the entropy is fixed with the help of the monopole-loop distribution.

   hep-lathep-phhep-thNucl.Phys.B Proc.Suppl.(2004)·2 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.