Browsing Pure & Applied Mathematics (Scholarly Publications) by Author "RYAN, SINEAD MARIE"
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The 2 + 2 anisotropic Wilson gluon action with applications
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (2004)A generalization of anisotropic lattices to include a 2+2 discretization is discussed. As a part of this program, we determine the oneloop correction to the gluon selfenergy and analyse the restoration of Lorentz ... 
B and D meson decay constants in lattice QCD
RYAN, SINEAD MARIE (American Physical Society, 1998)We have calculated the decay constants of B and D mesons with lattice QCD. We use an O(a)improved action that takes light quark actions as a starting point, tuned so that it can be directly applied at the physical masses ... 
B and D semileptonic decays to light mesons
RYAN, SINEAD MARIE (20081009)We present an update of our calculation of the form factors and partial widths of semileptonic heavytolight meson decays, in the quenched approximation. Our complete data set has now been analysed and our results include ... 
Bottomonium above deconfinement in lattice nonrelativistic QCD
RYAN, SINEAD MARIE (American Physical Society, 2011)We study the temperature dependence of bottomonium for temperatures in the range 0.4Tc<T<2.1Tc, using nonrelativistic dynamics for the bottom quark and full relativistic lattice QCD simulations for Nf=2 light flavors on a ... 
Charmonium spectroscopy on dynamical anisotropic lattices
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE; SKULLERUD, JONIVAR (Elsevier, 2006)We present a first study of the charmonium spectrum on Nf = 2 dynamical, anisotropic lattices. We take advantage of alltoall quark propagators to build spatially extended interpolating operators to increase the overlap ... 
Dynamical QCD simulations on anisotropic lattices
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (2006)The simulation of QCD on dynamical ( N f 2 ) anisotropic lattices is described. A method for nonperturbative renormalisation of the parameters in the anisotropic gauge and quark actions is presented. The precision ... 
Effect of treelevel and meanfield improvement on the lighthadron spectrum in quenched QCD
RYAN, SINEAD MARIE (American Physical Society, 1997)We compute the lighthadron mass spectrum at b55.7 using the O(a)improved SheikholeslamiWohlert fermion action with two choices of the clover coefficient: the classical value c51 and a meanfield or tadpoleimproved ... 
Estimated errors in Vcd/Vcs from semileptonic D decays
RYAN, SINEAD MARIE (Elsevier, 1999)We estimate statistical and systematic errors in the extraction of the CKM ratio Vcd/Vcs from exclusive Dmeson semileptonic decays using lattice QCD and anticipated new experimental results. 
Excited and exotic charmonium spectroscopy from lattice QCD
RYAN, SINEAD MARIE; PEARDON, MICHAEL JAMES (2012)We present a spectrum of highly excited charmonium mesons up to around 4.5 GeV calculated using dynamical lattice QCD. Employing novel computational techniques and the variational method with a large basis of carefully ... 
Excited D and Ds meson spectroscopy from lattice QCD
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (2012) 
Excited spectroscopy of charmed mesons from lattice QCD
RYAN, SINEAD MARIE; PEARDON, MICHAEL JAMES (2013)We present spectra of highly excited D and D s mesons up to around 3.8 GeV determined using dynamical lattice QCD. We employ novel computational techniques and the variational method with a large basis of carefully constructed ... 
ExcitedNucleon Spectroscopy with 2+1 Flavour Fermions
RYAN, SINEAD MARIE (2009)We present progressmade by the Hadron SpectrumCollaboration (HSC) in determining the tower of excited nucleon states using 2+1flavor anisotropic clover lattices. The HSC has been investigating interpolating operators ... 
Gauge theories on a 2+2 anisotropic lattice
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (American Physical Society, 2003)The implementation of gauge theories on a fourdimensional anisotropic lattice with two distinct lattice spacings is discussed, with special attention to the case where two axes are finely and two axes are coarsely discretized. ... 
Heavy hadrons on an anisotropic lattice
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (Elsevier, 2004)Results from simulations of quarkonia and heavylight mesons on an anisotropic lattice are presented. The improved quark action and actionparameter tuning used in this study are discussed. 
Heavy quark physics from lattice QCD
RYAN, SINEAD MARIE (Elsevier, 2002)I review the current status of lattice calculations of heavy quark quantities. Particular emphasis is placed on leptonic and semileptonic decay matrix elements. 
Improving Algorithms to Compute All Elements of the Lattice Quark Propagator
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE; SKULLERUD, JONIVAR (Elsevier, 2005)We present a new exact algorithm for estimating all elements of the quark propagator. The advantage of the method is that the exact alltoall propagator is reproduced in a large but finite number of inversions. The ...