UScholar Works
 
Filters: Department: "Physics" Collection: "ir_uspace"
1 - 25 of 17
Number of results to display per page
CreatorTitleDescriptionSubjectDate
1 DeTar, CarletonSignals for hadronic modes in the quark plasmaWe give a new argument for the occurrence of hadronic modes in the high-temperature quark plasma, present a crude phenomenological model of the plasma, and discuss possible experimental signatures for the low-lying modes.Quark plasma; Hadronic matter; Phase transitions1988-01
2 DeTar, CarletonSemileptonic decays of heavy mesons with the fat clover actionWe 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 quarks2000-04
3 DeTar, CarletonHeavy-light decay constants using clover valence quarks and three flavors of dynamical improved staggered quarksStarting 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 quarks2005-03
4 DeTar, CarletonSemileptonic D → π/K and B → π/D decays in 2+1 flavor lattice QCDWe 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 decay2005-03
5 DeTar, CarletonAssorted weak matrix elements involving the bottom quarkAs part of a larger project to estimate the fB decay constant, we are recalculating fstatic B using a variational smearing method in an effort to improve accuracy. Preliminary results for the static BB parameter and HQET two point functions are also presented.Bottom quark; Decay constants; HQET; Effective field theory1997-02
6 Lupton, John MarkEvidence for temperature-independent triplet diffusion in a ladder-type conjugated polymerWe study the temperature dependence of triplet formation and decay by considering the phosphorescence dynamics in a prototypical conjugated polymer matrix. The dynamics of triplet formation as a function of temperature are unraveled by applying an electric field during optical singlet generation a...Triplet diffusion; Triplet excitons; Ladder-type conjugated polymers; Temperature dependence2006-12
7 Wu, Yong-ShiHolography and noncommutative Yang-Mills theoryIn this Letter a recently proposed gravity dual of noncommutative Yang-Mills theory is derived from the relations between closed string moduli and open string moduli recently suggested by Seiberg and Witten. The only new input one needs is a simple form of the running string tension as a function ...Noncommutativity; String theory; Gravity dual2000-03
8 Gondolo, PaoloNeutralino with the right cold dark matter abundance in (almost) any supersymmetric modelWe consider nonstandard cosmological models in which the late decay of a scalar field Ø reheats the Universe to a low reheating temperature, between 5 MeV and the standard freeze-out temperature of neutralinos of mass mx. We point out that in these models all neutralinos with standard density Ώstd...Neutralinos; Reheating temperature2006-07
9 DeTar, CarletonPseudodeconfinement and dynamical confinement in the quark plasmaWe elaborate upon phenomenological models of high-temperature hadronic matter at zero baryon density. We discuss the choice of a practical set of "fundamental" degrees of freedom, indicate their relationship to dynamically confined plasma modes, and suggest in what way they may account for the phase...Quark plasma; Gluon plasma; Hadronic matter; Deconfinement; Glueballs; Mesons; Phase transitions1988-04
10 DeTar, CarletonB̄→D*ℓν̄ form factor at zero recoil from three-flavor lattice QCD: a model independent determination of [Vcb]We present the first lattice QCD calculation of the form factor for B→ D* lv with three flavors of sea quarks. We use an improved staggered action for the light valence and sea quarks (the MILC configurations), and the Fermilab action for the heavy quarks. The form factor is computed at zero recoi...Staggered quarks2009-01
11 Vardeny, Zeev ValentinePhotoexcitation dynamics in polythiophene/fullerene blends for photovoltaic applicationsWe used the transient and steady state photomodulation spectroscopies for studying the photoexcitations dynamics in blends of regio-regular poly(3-hexylthiophene) (RR-P3HT) and fullerene in a broad spectral range from 0.15 to 2.25 eV. We found that both localized polarons and singlet excitons are in...2012-01-01
12 Wu, Yong-ShiRemarks on noncommutative open string theory: V duality and holographyIn this paper we study the interplay of electric and magnetic backgrounds in determining the decoupling limit of coincident D branes towards a noncommutative Yang-Mills (NCYM) or open string (NCOS) theory. No decoupling limit has been found for the NCYM model with space-time noncommutativity. It i...Hubbard operator; Bosonization; Deformation; t-J model2001-03
13 Wu, Yong-ShiC-functions of noncommutative Yang-Mills theory from holographyIn this paper we study non-commutative Yang-Mills theory (NCYM) through its gravity dual. First it is shown that the gravity dual of an NCYM with self-dual θ-parameters has a Lagrangian in the form of five-dimensional dilatonic gravity. Then we use the de-Boer-Verlinde-Verlinde formalism for holog...2000-05-01
14 Symko, Orest GeorgeChaos in long Josephson junctions without external rf driving forceSimulations of long Josephson junctions in an external magnetic field show a variety of chaotic behaviors. They consist of period-doubling bifurcation, intermittency between and within Fiske steps, and quasiperiodic motion at Fiske steps. A physical explanation for the chaotic behavior is presented....Fiske steps; Chaos; Chaotic behaviors1990-09
15 Gondolo, PaoloEffect of a late decaying scalar on the neutralino relic densityIf the energy density of the Universe before nucleosynthesis is dominated by a scalar field Ø that decays and reheats the plasma to a temperature TRH smaller than the standard neutralino freeze-out temperature, the neutralino relic density differs from its standard value. In this case, the relic de...Neutralinos; Relic density; Reheating temperature2006-10
16 Wu, Yong-ShiDynamics of giant-gravitons in the LLM geometry and the fractional quantum Hall effectThe LLM's 1/2 BPS solutions of IIB supergravity are known to be closely related to the integer quantum Hall droplets with filling factor v = 1, and the giant gravitons in the LLM geometry behave like the quasi-holes in those droplets. In this paper we consider how the fractional quantum Hall effect ...2006
17 DeTar, CarletonB→πlν semileptonic form factor from three-flavor lattice QCD: a model-independent determination of [Vub]We calculate the form factor f+(q2) for B-meson semileptonic decay in unquenched lattice QCD with 2 + 1 flavors of light sea quarks. We use Asqtad-improved staggered light quarks and a Fermilab bottom quark on gauge configurations generated by the MILC Collaboration. We simulate with several light...Semileptonic decay2009-03
1 - 25 of 17