Filters: Journal Title:"Nuclear Physics B - Proceedings Supplements" Publisher:"Elsevier" Collection:"ir_uspace"
| Title | Creator | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |  | Semileptonic D → π/K and B → π/D decays in 2+1 flavor lattice QCD | DeTar, Carleton | We present results for form factors of semileptonic decays of D and B mesons in 2+1 flavor lattice QCD using the MILC gauge configurations. With an improved staggered action for light quarks, we successfully reduce the systematic error from the chiral extrapolation. The results for D decays are in a... | Semileptonic decay | 2005-03 |
| 2 |  | Semileptonic decays of heavy mesons with the fat clover action | DeTar, Carleton | We are studying a variety of semileptonic decays of heavy-light mesons in an effort to improve the determination of the heavy-quark Standard-Model CKM matrix elements. Our fermion action is a novel, improved "fat" clover action that promises to reduce problems with exceptional configurations. Dynami... | Semileptonic decay; Decay constants; Staggered quarks; Fat-clover valence quarks | 2000-04 |
| 3 |  | Quark loop effects in semileptonic form factors for heavy-light mesons | DeTar, Carleton | We present preliminary results of a determination of the semileptonic form factor for the decay of pseudoscalar heavy-light mesons to pseudoscalar light-light mesons in full QCD. In this preliminary study we focus on the effects of dynamical quark loops. Accordingly, we compare results of simulati... | Semileptonic decay; Form factors; Quark loops; Wilson quarks | 2004-03 |
| 4 |  | Heavy-light decay constants - MILC results with the Wilson action | DeTar, Carleton | We present the current status of our ongoing calculations of pseudoscalar meson decay constants for mesons that contain one light and one heavy quark (fB, fBs , fD, fDs ). We are currently generating new gauge configurations that include dynamical quarks and calculating the decay constants. In add... | Decay constants; Wilson action; Kogut-Susskind quarks; Staggered quarks; Chiral extrapolation | 1998-01 |
| 5 |  | Heavy-light decay constants using clover valence quarks and three flavors of dynamical improved staggered quarks | DeTar, Carleton | Starting in 2001, the MILC Collaboration began a large scale calculation of heavy-light meson decay constants using clover valence quarks on ensembles of three flavor configurations. For the coarse configurations, with a = 0.12 fm, eight combinations of dynamical light and strange quarks have been ... | Decay constants; Clover valence quarks; Staggered quarks | 2005-03 |
| 6 |  | Heavy-light decay constants with dynamical gauge configurations and Wilson or improved valence quark actions | DeTar, Carleton | We describe a calculation of heavy-light decay constants including virtual quark loop effects. We have generated dynamical gauge configurations at three _x000C_ values using two flavors of Kogut-Susskind quarks with a range of masses. These are analyzed with a Wilson valence quark action. Prelimin... | Decay constants; Kogut-Susskind quarks; Wilson quarks; Fat-clover valence quarks | 2000-04 |
| 7 |  | Heavy-light decay constants with three dynamical flavors | DeTar, Carleton | We present preliminary results for the heavy-light leptonic decay constants in the presence of three light dynamical flavors. We generate dynamical configurations with improved staggered and gauge actions and analyze them for heavy-light physics with tadpole improved clover valence quarks. When th... | Leptonic decay; Decay constants | 2002-03 |
| 8 |  | Heavy-light decay constants: conclusions from the Wilson action | DeTar, Carleton | We report on the results of a MILC collaboration calculation of fB, fBs , fD, fDs and their ratios. We discuss the most important errors in more detail than we have elsewhere. | Decay constants; Wilson action; Staggered quarks | 1999-03 |
| 9 |  | Heavy-light meson decay constants with N f = 3 | DeTar, Carleton | During the past year the MILC Collaboration has continued its study of heavy-light meson decay constants with three dynamical quarks. Calculations have been extended to a second lattice spacing of about 0.09 fm. At this lattice spacing, there are results in the quenched approximation and for thr... | Dynamical quarks | 2003-05 |
| 10 |  | Update on fB | DeTar, Carleton | We describe the current status of the MILC collaboration computation of fB, fBs , fD, fDs and their ratios. Progress over the past year includes: better statistics and plateaus at _x000C_β = 6.52 (quenched), β_x000C_ = 5.6 (NF = 2) and β_x000C_ = 5.445 (NF = 2), new runs with a wide range of dyn... | Decay constants; Wilson quarks | 1997-02 |
| 11 |  | Update on the hadron spectrum with two flavors of staggered quarks | DeTar, Carleton | We present an update on the MILC Collaboration's light hadron spectrum calculation with two flavors of dynamical, staggered quarks. Results are presented for gauge couplings 5.30, 5.415, 5.50 and 5.60, with a range of quark masses for each value of the coupling. We present extrapolations of mN/mp ... | Staggered quarks; Hadron spectrum | 1998-04 |
| 12 |  | Phase diagram of high temperature QCD with three flavors of improved staggered quarks | DeTar, Carleton | We report on progress in our study of high temperature QCD with three flavors of improved staggered quarks. Simulations are being carried out with three degenerate quarks with masses less than or equal to the strange quark mass, ms, and with degenerate up and down quarks with masses in the range 0... | Staggered quarks | 2004-03 |
| 13 |  | Static hybrid quarkonium potential with improved staggered quarks | DeTar, Carleton | We are studying the effects of light dynamical quarks on the excitation energies of a flux tube between a static quark and antiquark. We report preliminary results of an analysis of the ground state potential and the ∑g′+ and Πu potentials. We have measured these potentials on closely matched... | Quarkonium; Staggered quarks; Flux tube | 2003-05 |
| 14 |  | String breaking in lattice QCD | DeTar, Carleton | The separation of a heavy quark and antiquark pair leads to the formation of a tube of flux, or string, which should break in the presence of light quark-antiquark pairs. This expected zero temperature phenomenon has proven elusive in simulations of lattice QCD. We present simulation results that ... | String breaking; Flux tube; Staggered quarks; Wilson loop; Polyakov loop | 1999-03 |
| 15 |  | SU(3) lattice gauge theory with adjoint action at nonzero temperature | DeTar, Carleton | We study the thermal phase diagram of pure SU(3) gauge theory with fundamental and adjoint couplings. We improve previous estimates of the position of the bulk transition line and determine the thermal deconfinement transition lines for Nt = 2,4,6, and 8. For Nt > 4 the deconfinement transition li... | Phase transitions; Deconfinement | 1995-04 |
| 16 |  | Preliminary heavy-light decay constants from the MILC collaboration | DeTar, Carleton | Preliminary results from the MILC collaboration for fβ, / fβs, /fD, /fD„ and their ratios are presented. We compute in the quenched approximation at β = 6.3, 6.0 and 5.7 with Wilson light quarks and static and Wilson heavy quarks. We attempt to quantify all systematic errors other than quenchin... | Decay constants; Wilson quarks | 1995-04 |
| 17 |  | Finite temperature lattice QCD with clover fermions | DeTar, Carleton | We report on our simulation of finite temperature lattice QCD with two flavors of O(a) Symanzik-improved fermions and O(a2) Symanzik-improved glue. Our thermodynamic simulations were performed on an 83 × 4 lattice, and we have performed complementary zero temperature simulations on an 83 × 16 la... | Wilson quarks; Clover fermions | 1997-02 |
| 18 |  | Finite temperature QCD: progress and outstanding problems | DeTar, Carleton | I review recent progress in numerical simulations of finite temperature quantum chromodynamics and discuss the status of some outstanding problems. Included is (1) a discussion of recent results determining the temperature of the "phase transition" in full QCD, (2) a scaling analysis of the Polyakov... | Phase transitions; Staggered fermions; Wilson fermions; Polyakov loop; Deconfinement; Instanton | 1995-04 |
| 19 |  | First signs for string breaking in two-flavor QCD | DeTar, Carleton | We have been examining the phenomenon of string breaking in QCD with two flavors of dynamical staggered quarks. We construct a transfer matrix from a combination of "string" and "two-meson" channels. Preliminary results with low statistics show the expected signs of string breaking. | String breaking; Wilson loop; Staggered quarks | 2000-04 |
| 20 |  | Excited states in staggered meson propagators | DeTar, Carleton | We report on preliminary results from multi-particle fits to meson propagators with three flavors of light dynamical quarks. We are able to measure excited states in propagators with pion quantum numbers, which we interpret as the pion 2S state, and argue is evidence of locality of the action. In t... | Excited states; Meson propagators | 2004-03 |
| 21 |  | Exotic hybrid mesons from improved Kogut-Susskind fermions | DeTar, Carleton | We summarize our measurement of the mass of the exotic 1−+ hybrid meson using an improved Kogut-Susskind action. We show results from both quenched and dynamical quark simulations and compare with results from Wilson quarks. Extrapolation of these results to the physical quark mass allows compar... | Chromomagnetic field; Kogut-Susskind fermions; Wilson quarks | 2003-05 |
| 22 |  | Exotic hybrid mesons with light quarks | DeTar, Carleton | Hybrid mesons, made from a quark, an antiquark and gluons, can have quantum numbers inaccessible to conventional quark-antiquark states. Confirmation of such states would give information on the role of "dynamical" color in low energy QCD. We present preliminary results for hybrid meson masses using... | Hybrid mesons; Kogut-Susskind quarks; Wilson quarks | 1997-02 |
| 23 |  | Exotic meson spectroscopy from the clover action at β = 5.85 and 6.15* | DeTar, Carleton | We repeat our original simulations of the hybrid meson spectrum using the clover action, as a check on lattice artifacts. Our results for the 1−+ masses do not substantially change. We present preliminary results for the wave function of the 1−+ state in Coulomb gauge. | Clover action; Quark spectroscopy | 1999-03 |
| 24 |  | Nt = 6 equation of state for two flavor QCD | DeTar, Carleton | We improve the calculation of the equation of state for two flavor QCD by simulating on Nt = 6 lattices at appropriate values of the couplings for the deconfinement/chiral symmetry restoration crossover. For amq = 0.0125 the energy density rises rapidly to approximately 1 GeV/fm3 just after the cro... | Kogut-Susskind fermions; Quark-gluon plasma | 1996-03 |
| 25 |  | Observing the ultrahigh energy universe with OWL eyes | Sokolsky, Pierre | The goal of the Orbiting Wide-field Light-collectors (OWL) mission is to study the origin and physics of the highest energy particles known in nature, the ultrahigh energy cosmic rays (UHECRs). The OWL mission consists of telescopes with UV sensitive cameras on two satellites operating in tandem to ... | Ultra-high energy cosmic rays; Fluorescence; Air showers | 2004-11 |