Publications (117)
Masses of singlet and non-singlet 0++ particles
UKQCD Collaboration, Alistair Hart, Craig McNeile +1
We compute the mass of the singlet 0++ state using both (psi_bar psi) and Wilson loop operators from a N_f=2 lattice QCD calculation.
The Hyperfine Splitting in Charmonium: Lattice Computations Using the Wilson and Clover Fermion Actions
UKQCD Collaboration, C. R. Allton, C. T. Sachrajda +10
We compute the hyperfine splitting on the lattice, using both the Wilson and -improved (clover) actions for quenched quarks. The computations are performe…
The Nature of the Hadronic String
UKQCD Collaboration, C. Michael, P. W. Stephenson
We study a closed hadronic string using pure glue lattice simulation. We measure the energy of the flux state encircling the periodic boundary condition (the torelon). From these d…
The Charge and Matter radial distributions of Heavy-Light mesons calculated on a lattice with dynamical fermions
UKQCD Collaboration, A. M. Green, J. Koponen +2
A knowledge of the radial distributions of quarks inside hadrons could lead to a better understanding of the QCD description of these hadrons and possibly suggest forms for phenome…
Effects of non-perturbatively improved dynamical fermions in QCD at fixed lattice spacing
UKQCD Collaboration, C. R. Allton, S. P. Booth +17
We present results for the static inter-quark potential, lightest glueballs, light hadron spectrum and topological susceptibility using a non-perturbatively improved action on a $1…
The eta and eta' mesons in QCD
UKQCD Collaboration, C. McNeile, C. Michael
We study the flavour singlet pseudoscalar mesons from first principles using lattice QCD. We explore the quark content of the and mesons and we discuss their decay const…
String breaking in zero-temperature lattice QCD
UKQCD Collaboration, P. Pennanen, C. Michael
The crossing from a static quark-antiquark system to a system of two static-light mesons when the separation of the static quarks is increased is calculated in zero-temperature lat…
Domain Wall QCD with Near-Physical Pions
RBC Collaboration, UKQCD Collaboration, R. Arthur +16
We present physical results for a variety of light hadronic quantities obtained via a combined analysis of three 2+1 flavour domain wall fermion ensemble sets. For two of our ensem…
Lattice-Constrained Parametrizations of Form Factors for Semileptonic and Rare Radiative B Decays
UKQCD Collaboration, Luigi Del Debbio, Jonathan M. Flynn +2
We describe the form factors for B to rho lepton neutrino and B to K* gamma decays with just two parameters and the two form factors for B to pi lepton neutrino with a further two…
The decay constant of the first excited pion from lattice QCD
UKQCD Collaboration, C. McNeile, C. Michael
We review the theory that predicts that the decay constant of the excited light pseudo-scalar mesons are suppressed in the chiral limit relative to the pion decay constant. We comp…
Feasibility study of using the overlap-Dirac operator for hadron spectroscopy
UKQCD Collaboration, Craig McNeile, Alan Irving +1
We investigate a number of algorithms that calculate the quark propagators for the overlap-Dirac fermion operator. The QCD simulations were performed at beta = 5.9 with a lattice v…
Charmed Meson Spectroscopy and Matrix Elements with an O(a)-Improved Clover Fermion Action
UKQCD Collaboration, presented by David Richards
We present preliminary results for the spectrum and decay matrix elements for heavy-light and heavy-heavy mesons, obtained on the 64-node Meiko Computing Surface at the University…
N* Spectrum using an O(a)-Improved Fermion Action
LHPC Collaboration, UKQCD Collaboration, D. G. Richards
The construction of operators and calculational methods for the determination of the N* spectrum are discussed. The masses of the parity partners of the nucleon and delta are compu…
The Charge and Matter radial distributions of Heavy-Light mesons calculated on a lattice
UKQCD Collaboration, A. M. Green, J. Koponen +2
For a heavy-light meson with a static heavy quark, we can explore the light quark distribution. The charge and matter radial distributions of these heavy-light mesons are measured…
Determination of constant lattice spacing trajectories in lattice QCD
Alan C. Irving, UKQCD Collaboration
We argue that lattice simulations of full QCD with varying quark mass are best conducted at fixed lattice spacing rather than at fixed . We present techniques which enable this…
Lattice Study of the Decay B^0-bar -> rho^+ l^- nu_l-bar: Model-Independent Determination of |V_{ub}|
UKQCD Collaboration, J M Flynn, J Nieves +9
We present results of a lattice computation of the vector and axial-vector current matrix elements relevant for the semileptonic decay B^0-bar -> rho^+ l^- nu_l-bar. The computatio…
Negative-parity Baryon Masses using an O(a)-improved Fermion Action
LHPC Collaboration, QCDSF Collaboration, UKQCD Collaboration +7
We present a calculation of the mass of the lowest-lying negative-parity J=1/2- state in quenched QCD. Results are obtained using a non-perturbatively O(a)-improved clover fermion…
Light hadron spectroscopy with O(a) improved dynamical fermions
UKQCD Collaboration, C. R. Allton, S. P. Booth +12
We present the first results for the static quark potential and the light hadron spectrum using dynamical fermions at using an O(a) improved Wilson fermion action together…
Hybrid meson decay from the lattice
UKQCD Collaboration, C. McNeile, C. Michael +1
We discuss the allowed decays of a hybrid meson in the heavy quark limit. We deduce that an important decay will be into a heavy quark non-hybrid state and a light quark meson, in…
Phenomenology of static-light mesons from unquenched lattice QCD calculations
UKQCD Collaboration, Craig McNeile, Chris Michael +1
We present results for the static-light meson from unquenched lattice QCD. The unquenched gauge configurations were generated using the non-perturbatively improved clover action. A…
The flavour singlet mesons in QCD
UKQCD Collaboration, C. McNeile, C. Michael +1
We study the flavour singlet mesons from first principles using lattice QCD. We explore the splitting between flavour singlet and non-singlet for vector and axial mesons as well as…
Mixing of scalar glueballs and flavour-singlet scalar mesons
UKQCD Collaboration, Craig McNeile, Chris Michael
We discuss in detail the extraction of hadronic mixing strengths from lattice studies. We apply this to the mixing of a scalar glueball and a scalar meson in the quenched approxima…
An Investigation of the Soft Pion Relation in Quenched Lattice QCD
UKQCD Collaboration, K. C. Bowler, C. M. Maynard +6
A lattice determination of the form factor and decay constants for the semileptonic decay of heavy pseudoscalar (PS) mesons at zero recoil is presented from which the soft pion rel…
Light quark masses for dynamical, non-perturbatively O(a) improved Wilson fermions
D. Pleiter, QCDSF Collaboration, UKQCD Collaboration
We present results for the light quark masses in lattice QCD with two degenerate flavours of dynamical fermions. We used configurations generated by the UKQCD and QCDSF collaborati…
Quenched QCD with O(a) improvement: I. The spectrum of light hadrons
UKQCD Collaboration, K. C. Bowler, P. Boyle +9
We present a comprehensive study of the masses of pseudoscalar and vector mesons, as well as octet and decuplet baryons computed in O(a) improved quenched lattice QCD. Results have…
Hadrons with a heavy colour-adjoint particle
UKQCD Collaboration, M. Foster, C. Michael
We discuss the spectrum of hadrons with a heavy colour-adjoint particle - motivated by the gluino of supersymmetry. Using the lattice approach, we explore in detail the gluonic bou…
: Penguins on the Lattice
UKQCD Collaboration
We calculate the leading-order matrix element for the decay in the quenched approximation of lattice QCD on a lattice at , using an O(a)-imp…
Excited nucleon spectrum using a non-perturbatively improved clover fermion action
LHPC Collaboration, D. G. Richards, QCDSF Collaboration +8
We discuss the extraction of negative-parity baryon masses from lattice QCD calculations. The mass of the lowest-lying negative-parity state is computed in quenched l…
Results From The UKQCD Parallel Tempering Project
Balint Joo, UKQCD Collaboration
We present results from our study of the Parallel Tempering algorithm. We examine the swapping acceptance rate of a twin subensemble PT system. We use action matching technology in…
Standard Model Matrix Elements for Neutral B-Meson Mixing and Associated Decay Constants
UKQCD Collaboration, Laurent Lellouch, C. -J. David Lin
We present results of quenched lattice calculations of the matrix elements relevant for B_d-\bar B_d and B_s-\bar B_s mixing in the Standard Model. Results for the corresponding SU…
Chiral Limit and Light Quark Masses in 2+1 Flavor Domain Wall QCD
UKQCD Collaboration, M. F. Lin, E. E. Scholz
We present results for meson masses and decay constants measured on 24^3x64 lattices using the domain wall fermion formulation with an extension of the fifth dimension of L_s=16 fo…
The Running Coupling from SU(3) Potentials
UKQCD Collaboration
From an accurate determination of the inter-quark potential, one can study the running coupling constant for a range of -values and hence estimate the scale $Î_{\overline{\rm M…
The mass of the charm quark from unquenched lattice QCD at fixed lattice spacing
UKQCD Collaboration, A. Dougall, C. M. Maynard +1
We determine the mass of the charm quark () from lattice QCD with two flavors of dynamical quarks with a mass around the strange quark. We compare this to a determination in q…
The Isgur-Wise Function: A Lattice Determination from Pseudoscalar --> Pseudoscalar Form Factors
UKQCD Collaboration, James N. Simone
Form factors for pseudoscalar --> pseudoscalar decays of heavy-light mesons are found in quenched lattice QCD with heavy-quark masses in the range of approximately 1-2 GeV. The Isg…
Light quark masses from UKQCD's dynamical simulations with O(a)-improved Wilson fermions
D. J. Hepburn, UKQCD Collaboration
I present preliminary results on the light quark masses from a partially quenched analysis of UKQCD's dynamical datasets.
An ``Improved" Lattice Study of Semi-leptonic Decays of D-Mesons
UKQCD Collaboration
We present results of a lattice computation of the matrix elements of the vector and axial-vector currents which are relevant for the semi-leptonic decays and $D…
Light meson masses and non-perturbative renormalisation in 2+1 flavour domain wall QCD
C. Allton, D. J. Antonio, P. A. Boyle +13
We present results for the light meson masses, the bare strange quark mass and preliminary non-perturbative renormalisation of B_K in 2+1 flavour domain wall QCD. The ensembles use…
Quenched Light Hadron Spectrum and Decay Constants using Improved Wilson Fermion Actions
UKQCD Collaboration, presented by Richard Kenway
We compare results obtained using the Sheikholeslami-Wohlert (SW) fermion action with tree-level and tadpole-improved coefficients for .
Searching for chiral logs in the static-light decay constant
UKQCD Collaboration, C McNeile, C. Michael
Using the clover fermion action in unquenched QCD with pion masses as low as 420 MeV, we look for evidence for chiral logs in the static-light decay constant. There is some evidenc…
Block Algorithms for Quark Propagator Calculation
Stephen M. Pickles, UKQCD Collaboration
Computing quark propagators in lattice QCD is equivalent to solving large, sparse linear systems with multiple right-hand sides. Block algorithms attempt to accelerate the converge…
Improved Wilson QCD simulations at light quark masses
A. C. Irving, UKQCD Collaboration
We present preliminary results from UKQCD simulations at light quark masses using two flavours of non-pertubatively improved Wilson fermions. We report on the performance of the st…
The strangeness content of the nucleon
C. Michael, C. McNeile, D. Hepburn +1
We evaluate the matrix element of in hadron states on a lattice. We find substantial mixing of the connected and disconnected contributions so that the lattice result t…
Lattice Calculation of Baryon Masses using the Clover Fermion Action
LHPC Collaboration, D. G. Richards, QCDSF Collaboration +8
We present a calculation of the lowest-lying baryon masses in the quenched approximation to QCD. The calculations are performed using a non-perturbatively improved clover fermion a…
The radial wavefunctions of a heavy-light meson calculated on a lattice
UKQCD Collaboration, A. M. Green, J. Koponen +2
A brief review is given of attempts to understand the energies of four-quark systems calculated on a lattice in terms of nuclear-physics-inspired many-body techniques involving int…
Light meson masses and decay constants in 2+1 flavour domain wall QCD
D. J. Antonio, K. C. Bowler, P. A. Boyle +9
We present results for light meson masses and psedoscalar meson decay constants in 2+1 flavour domain wall QCD with the DBW2 and Iwasaki gauge actions, using lattices with linear s…
On the glueball spectrum in O(a)-improved lattice QCD
UKQCD Collaboration, A. Hart, M. Teper
We calculate the light `glueball' mass spectrum in N_f=2 lattice QCD using a fermion action that is non-perturbatively O(a) improved. We work at lattice spacings a ~0.1 fm and with…
Quenched Light Hadron Spectroscopy: Comparing the Wilson and O(a)-Improved Fermion Actions
UKQCD Collaboration, presented by Alan D. Simpson
We have studied the light hadron spectrum and decay constants for quenched QCD at beta=6.2 on a 24^3x48 lattice. We compare the results obtained using a nearest-neighbour O(a)-impr…
P-wave Radial distributions of a Heavy-light meson on a lattice
UKQCD Collaboration, A. M. Green, J. Koponen +1
This is a follow-up to our earlier work for the charge (vector) and matter (scalar) distributions for S-wave states in a heavy-light meson, where the heavy quark is static and the…
First Lattice Study of Semileptonic Decays of Lambda_b and Xi_b Baryons
UKQCD Collaboration, K. C. Bowler, R. D. Kenway +7
We present the results of the first lattice study of semileptonic decays of baryons containing a b-quark. Predictions for the decay distributions are given and the Isgur-Wise funct…
Hadronic decays from the lattice
UKQCD Collaboration, C. Michael, C. McNeile
We discuss strategies to determine hadronic decay couplings from lattice studies. As an application, we explore the decay of a vector meson to two pseudoscalar mesons with …
Delta S=2 and Delta I=3/2 Matrix Elements in Quenched QCD
Laurent Lellouch, C. -J. David Lin, UKQCD Collaboration
We present preliminary results for B_K, B_7^{3/2} and B_8^{3/2} from two high-statistics lattice computations. These calculations are performed at beta=6.0 and 6.2 in the quenched…
Nucleon form factors and structure functions with N_f=2+1 dynamical domain wall fermions
UKQCD Collaboration, Takeshi Yamazaki, Shigemi Ohta
We report isovector form factors and low moments of structure functions of nucleon in numerical lattice quantum chromodynamics (QCD) from the on-going calculations by the RIKEN-BNL…
Semileptonic decay of a heavy-light pseudoscalar to a light vector meson
UKQCD Collaboration, J. Gill
We present the results of a calculation of semileptonic form factors of D and B mesons. The calculation uses nonperturbatively order a improved quenched lattice QCD and two values…
Exploratory spectrum calculations using overlap valence quarks on a staggered sea
UKQCD Collaboration, K. C. Bowler, B. Joó +3
We present exploratory results for the hadron mass spectrum and pseudoscalar meson decay constants using mixed actions. We use improved staggered sea quarks and HYP-smeared overlap…
Heavy-light physics with NRQCD
UKQCD Collaboration
First results are obtained for B mesons using a heavy propagator calculated using NRQCD, and a light Wilson propagator. Results from 13 quenched configurations of size 16^3 x 48 at…
Quenched Heavy-Light Decay Constants
Hartmut Wittig, UKQCD Collaboration
We present decay constants from a quenched simulation using both propagating quarks and the static theory at on . The results using propagating quarks are us…
The charm quark mass with dynamical fermions
UKQCD Collaboration, A. Dougall, C. M. Maynard +1
We compute the charm quark mass in lattice QCD and compare different formulations of the heavy quark, and quenched data to that with dynamical sea quarks. We take the continuum lim…
Semi-leptonic decays of heavy mesons and the Isgur-Wise function in quenched lattice QCD
UKQCD Collaboration, K. C. Bowler, G. Douglas +3
The form factors for the semi-leptonic B->D and B->D* decays are evaluated in quenched lattice QCD at two different values of the coupling, beta=6.0 and 6.2. The action and the ope…
Gauge Invariant Smearing and Matrix Correlators using Wilson Fermions at beta=6.2
UKQCD Collaboration
We present an investigation of gauge invariant smearing for Wilson fermions on a lattice at . We demonstrate a smearing algorithm that allows a substantia…
The effect of tree-level and mean-field improvement on the light-hadron spectrum in quenched QCD
UKQCD Collaboration, H. P. Shanahan, C. T. H. Davies +10
We compute the light hadron mass spectrum at beta=5.7 using the O(a) improved Sheikholeslami-Wohlert (SW) fermion action with two choices of the clover coefficient: the classical v…
Light hadron spectrum using an O(a)-improved Wilson action with two dynamical quark flavours
Derek J. Hepburn, UKQCD Collaboration
I present results of recent work for the UKQCD Collaboration on the light hadron spectrum using a non-perturbatively O(a)-improved Wilson action with two degenerate flavours of dyn…
UKQCD's latest results for the static quark potential and light hadron spectrum with O(a) improved dynamical fermions
UKQCD Collaboration, J. Garden
We present UKQCD's latest results for the static quark potential and light hadron spectrum obtained from matched simulations using two flavours of dynamical quarks. We report that…
Geometrical Volume Effects in the Computation of the Slope of the Isgur-Wise Function
UKQCD Collaboration
We use a method recently suggested for evaluating the slope of the Isgur-Wise function, at the zero-recoil point, on the lattice. The computations are performed in the quenched app…
Tuning Actions and Observables in Lattice QCD
Alan C. Irving, James C. Sexton, Eamonn Cahill +5
We propose a strategy for conducting lattice QCD simulations at fixed volume but variable quark mass so as to investigate the physical effects of dynamical fermions. We present det…
The Light Hadron Spectrum and Decay Constants in Quenched Lattice QCD
UKQCD Collaboration
We present results for light hadrons composed of both degenerate and non-degenerate quarks in quenched lattice QCD. We calculate masses and decay constants using 60 gauge configura…
Upsilon Spectrum from NRQCD with Improved Action
UKQCD Collaboration, T. Manke, I. T. Drummond +2
We explore the effect of higher order operators in the non-relativistic formulation of QCD (NRQCD). We calculated masses in the b \bar b spectrum using quenched gauge configuration…
Heavy Hybrids from NRQCD
UKQCD Collaboration, T. Manke, I. T. Drummond +2
We present a quenched lattice calculation for the lowest lying -hybrid states in the framework of NRQCD using the leading order Hamiltonian up to . We d…
Mass splittings and matrix elements of mesons and baryons containing a single heavy quark
UKQCD Collaboration, presented by David Richards
We present a study in the quenched approximation of the parameter and the decay constant using heavy-quark propagators implemented in the static approximation, and…
Quenched Light Hadron Mass Spectrum and Decay Constants: the effects of -Improvement at
UKQCD Collaboration
We compare the light hadron spectrum and decay constants for quenched QCD at using an -improved nearest-neighbour Wilson fermion action with those obtained using the…
Hadronic decay of a vector meson from the lattice
UKQCD Collaboration, C. McNeile, C. Michael
We explore the decay of a vector meson to two pseudoscalar mesons on the lattice with flavours of sea quark. Although we are working with quark masses that do not allow a p…
Maximal variance reduction for stochastic propagators with applications to the static quark spectrum
UKQCD Collaboration, C. Michael, J. Peisa
We study a new method -- maximal variance reduction -- for reducing the variance of stochastic estimators for quark propagators. We find that while this method is comparable to usu…
Hybrid Quarkonia with High Statistics from NRQCD
UKQCD Collaboration, T. Manke, I. T. Drummond +2
We have studied the O(mv^6) effects in NRQCD on the spectrum of heavy quarkonia and compare our results for different lattices (quenched and dynamical). We also report on an invest…
First Lattice Study of the Form Factors A_0 and A_3 in the Decay Bbar^0 to rho^+ l^- nubar_l
UKQCD Collaboration, J M Flynn, J Nieves
We report on a lattice calculation of the form factors A_0 and A_3 for the pseudoscalar to vector meson semileptonic decay Bbar^0 to rho^+ l^- nubar_l. We find that resonant (or po…
Leptonic and semi-leptonic B decays
UKQCD Collaboration, C. M. Maynard
We present results for the semi-leptonic and leptonic decays of B mesons. These non-perturbative matrix elements are important for constraining the CKM matrix. Results are presente…
Excited B mesons from the lattice
UKQCD Collaboration, A. M. Green, J. Koponen +3
We determine the energies of the excited states of a heavy-light meson , with a static heavy quark and light quark with mass approximately that of the strange quark from…
Instability in the Molecular Dynamics Step of Hybrid Monte Carlo in Dynamical Fermion Lattice QCD Simulations
Balint Joo, Brian Pendleton, Anthony D. Kennedy +5
We investigate instability and reversibility within Hybrid Monte Carlo simulations using a non-perturbatively improved Wilson action. We demonstrate the onset of instability as tol…
Radial Correlations between two quarks
UKQCD Collaboration, A. M. Green, J. Koponen +2
In nuclear many-body problems the short-range correlation between two nucleons is well described by the corresponding correlation in the {two}-body problem. Therefore, as a first s…
An unquenched lattice QCD calculation of the mass of the bottom quark
UKQCD Collaboration, C. McNeile, C. Michael +1
We compute the b quark mass from dynamical lattice QCD with clover quarks. The calculation is done at a fixed lattice spacing with sea quark masses as low as half the strange quark…
The Isgur Wise function from the Lattice
UKQCD Collaboration, G. Douglas
We derive the form factors relevant for decays of pseudo-scalar mesons corresponding to the semi-leptonic decay B->D l nu. The simulations are performed in the quenched approximati…
Heavy Meson Spectroscopy at Beta=6.0
P. Boyle, UKQCD Collaboration
We present results of a quenched calculation of the heavy-light and quarkonium spectrum using the tadpole improved clover action. We resolve completely the triplet chi P-states in…
Decay constants of P-wave heavy-light mesons from unquenched lattice QCD
UKQCD Collaboration, G. Herdoiza, C. McNeile +1
We review some decays that require knowledge of the decay constants of heavy-light mesons. We compute the decay constants of P-wave heavy-light mesons from unquenched latti…
Quenched Heavy-Light Decay Constants
UKQCD Collaboration
We present results for heavy-light decay constants, using both propagating quarks and the static approximation, in O(a)-improved, quenched lattice QCD. At beta=6.2 on a 24^3x48 lat…
An estimate of the flavour singlet contributions to the hyperfine splitting in charmonium
UKQCD Collaboration, C. McNeile, C. Michael
We explore the splitting between flavour singlet and non-singlet mesons in charmonium. This has implications for the hyperfine splitting in charmonium.
Semi-leptonic decays of heavy mesons
UKQCD Collaboration, Chris Maynard
We present results of a lattice computation of the matrix elements of the vector currents which are relevant for the semileptonic decays of D to K, D to pi and B to pi. The computa…
Hadron masses from dynamical, non-perturbatively O(a) improved Wilson fermions
H. Stüben, QCDSF Collaboration, UKQCD Collaboration
We present results on light hadron masses from simulations of full QCD and report on experiences in running such simulations on a Hitachi SR8000-F1 supercomputer.
Form Factors for B -> pi l nu-bar_l and B -> K* gamma Decays on the Lattice
UKQCD Collaboration, D. R. Burford, H. D. Duong +5
We present a unified method for analysing form factors in B -> pi l nu-bar_l and B -> K* gamma decays. The analysis provides consistency checks on the q^2 and 1/M extrapolations ne…
Energies and radial distributions of B_s mesons - the effect of hypercubic blocking
UKQCD Collaboration, J. Koponen
This is a follow-up to our earlier work for the energies and the charge (vector) and matter (scalar) distributions for S-wave states in a heavy-light meson, where the heavy quark i…
Instabilities in Molecular Dynamics Integrators used in Hybrid Monte Carlo Simulations
B. Joo, UKQCD Collaboration
We discuss an instability in the leapfrog integration algorithm, widely used in current Hybrid Monte Carlo (HMC) simulations of lattice QCD. We demonstrate the instability in the s…
The topological susceptibility and pion decay constant from lattice QCD
UKQCD Collaboration, A. Hart, M. Teper
We study the topological susceptibility, chi, in two flavour lattice QCD. We find clear evidence for the expected suppression of chi at small quark mass. The estimate of the pion d…
Parallel Tempering in Lattice QCD with O(a)-Improved Wilson Fermions
Balint Joo, Alan C Irving, James C. Sexton +4
We present details of our investigation of the Parallel Tempering algorithm. We consider the application of action matching technology to the selection of parameters. We then prese…
Heavy light decay constants on the lattice
UKQCD Collaboration, C. M. Maynard
We present results for the leptonic decays of heavy-light mesons in the quenched approximation and a preliminary result for f_Ds with dynamical fermions for Nf=2. We examine the sy…
Techniques for using the overlap-Dirac operator to calculate hadron spectroscopy
UKQCD Collaboration, Craig McNeile
We report on our progress in using the overlap-Dirac fermion operator in simulations of lattice QCD. We have investigated the Lanczos based method of Borici, as well as various rat…
B_s meson excited states from the lattice
UKQCD Collaboration, A. M. Green, J. Ignatius +4
This is a follow-up to our earlier work [Phys. Rev. D 65, 014512 (2002); Eur. Phys. J. C 28, 79 (2003); Phys. Rev. D 69, 094505 (2004)] for the energies and the charge (vector) and…
Towards a lattice determination of the coupling
G. M. de Divitiis, L. Del Debbio, M. Di Pierro +4
The coupling is related to the form factor at zero momentum of the axial current between - and -states. This form factor is evaluated on the lattice us…
Determination of Vub from B->pi l nu on the lattice
UKQCD Collaboration, C. M. Maynard
We present results of a lattice study of the form factors in the decay B-> pi l nu. We attempt to disentangle the the dependence of the form factors on the light quark masses and t…
Results from Lattice QCD for baryons containing a heavy quark
UKQCD Collaboration, presented by Peer Ueberholz
We present the calculation of the spectrum of baryons containing one heavy quark. Heavy baryon and meson mass splittings are computed and compared with experiment. We give prelimin…
Effects of non-perturbatively improved dynamical fermions in UKQCD simulations
Alan C. Irving, UKQCD Collaboration
We present results for QCD with 2 degenerate flavours of quark using a non-perturbatively improved action on a lattice volume of where the bare gauge coupling and ba…
Calculation of f_B and the ``Isgur-Wise Function'' using a non-perturbatively improved fermion action
UKQCD Collaboration, David Richards
We present a calculation of f_B and of the form factors for the semi-leptonic decay B -> D l nu in the quenched approximation to QCD. Results are generated on lattices at beta = 6.…
Point-to-point Hadron Correlation Functions using the Sheikholeslami--Wohlert Action
UKQCD Collaboration, S. J. Hands, P. W. Stephenson +1
We calculate correlations between hadronic current operators as a function of their spatial separation, in a quenched lattice QCD simulation at on a lattice…
Improved B -> pi l nu_l form factors from the lattice
UKQCD Collaboration, K. C. Bowler, L. Del Debbio +6
We present the results of a lattice computation of the form factors for B^0 ->pi^- l^+nu_l decays near zero-recoil. These results will allow a determination of the CKM matrix eleme…