SRSinead M. Ryan
Sinead M. Ryan
*This is an algorithmically generated author record based on publicly available information.
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Previous Organizations / Institutes
The organizations / institutes from the scholar's other articles in the past ten years
Research Subjects
Research Interests
Sinead M. Ryan has a total of 223 co-authors. Here are the top co-authors by number of shared publications:
- Jon-Ivar Skullerud
National University of Ireland Maynooth
33 shared publications - Gert Aarts
Swansea University
29 shared publications - Michael Peardon
School of Mathematics Trinity College Dublin Dublin 2 Ireland
25 shared publications - Chris Allton
Swansea University
18 shared publications - Seyong Kim
Sejong University
17 shared publications - Andreas S. Kronfeld
Fermi National Accelerator Laboratory
12 shared publications
Latest Publications
- Open Access
- 1 April 2026
- Published by Jagiellonian University in Acta Physica Polonica B Proceedings Supplement
- Vol. 19 (4)
Heavy Quark Thermodynamics with Anisotropic Lattices
We present recent results from the Fastsum Collaboration, using anisotropic lattice QCD to study spectral properties of heavy quarkonia and open heavy flavour systems at high temperature. For heavy quarkonium, our results using a number of different methods suggest a small but significant and robust negative mass shift as well as an increasing thermal width. We present the first lattice results for masses and spectral functions of \(B\) mesons at high temperature, and preliminary results for a high-precision calculation of the static quark potential. Published by the Jagiellonian University 2026 authors- 1 April 2026
- Published by Jagiellonian University in Acta Physica Polonica B Proceedings Supplement
- Vol. 19 (4)
Open AccessHeavy Quark Thermodynamics with Anisotropic Lattices
We present recent results from the Fastsum Collaboration, using anisotropic lattice QCD to study spectral properties of heavy quarkonia and open heavy flavour systems at high temperature. For heavy quarkonium, our results using a number of different methods suggest a small but significant and robust negative mass shift as well as an increasing thermal width. We present the first lattice results for masses and spectral functions of \(B\) mesons at high temperature, and preliminary results for a high-precision calculation of the static quark potential. Published by the Jagiellonian University 2026 authors - 12 November 2025
- Published by Elsevier in Journal of Subatomic Particles and Cosmology
- Vol. 4
Approaching the continuum with anisotropic lattice thermodynamics
- 12 November 2025
- Published by Elsevier in Journal of Subatomic Particles and Cosmology
- Vol. 4
Approaching the continuum with anisotropic lattice thermodynamics
- Open Access
Finite temperature hadronic spectral properties
The FASTSUM collaboration has a long-standing project examining hadronic properties using anisotropic lattice QCD. We determine the spectral properties of bottomonia at finite temperature using lattice NRQCD and describe how our newer simulations improve our control over systematic errors. Motivated by these efforts, the temperature dependence of charm hadron masses is determined where it is found that temperature effects can extend into the confining phase and that some species remain stable deep past the pseudo-critical temperature.
Open AccessFinite temperature hadronic spectral properties
The FASTSUM collaboration has a long-standing project examining hadronic properties using anisotropic lattice QCD. We determine the spectral properties of bottomonia at finite temperature using lattice NRQCD and describe how our newer simulations improve our control over systematic errors. Motivated by these efforts, the temperature dependence of charm hadron masses is determined where it is found that temperature effects can extend into the confining phase and that some species remain stable deep past the pseudo-critical temperature.
- Open Access
- 24 February 2025
- Published by Sissa Medialab Srl
- Vol. 466, 203
NRQCD Bottomonium at non-zero temperature using time-derivative moments
A well-known challenge for the lattice community is calculating the spectral function from the Euclidean correlator. We have approximated the spectral function and derived the mass and thermal width of particles through the time derivatives of the lattice correlator moments. We have focused on extracting the properties of bottomonium states, specifically $\Upsilon$ and $\chi_{𝑏1}$ . We will give an overview of the time-derivative moments approach and present results for the temperature dependence of the mass and width of both bottomonium states. The zero temperature results are consistent with experimental values, while results at higher temperatures are similar to those obtained using other methods.- 24 February 2025
- Published by Sissa Medialab Srl
- Vol. 466, 203
Open AccessNRQCD Bottomonium at non-zero temperature using time-derivative moments
A well-known challenge for the lattice community is calculating the spectral function from the Euclidean correlator. We have approximated the spectral function and derived the mass and thermal width of particles through the time derivatives of the lattice correlator moments. We have focused on extracting the properties of bottomonium states, specifically $\Upsilon$ and $\chi_{𝑏1}$ . We will give an overview of the time-derivative moments approach and present results for the temperature dependence of the mass and width of both bottomonium states. The zero temperature results are consistent with experimental values, while results at higher temperatures are similar to those obtained using other methods. - Open Access
- 5 February 2025
- Published by Sissa Medialab Srl
- Vol. 466, 202
Anisotropic excited bottomonia from a basis of smeared operators
Bottomonia play a crucial role in our understanding of the quark gluon plasma. We present lattice non-relativistic QCD calculations of bottomonia at temperatures in the range $T\in\left[47,\,380\right]$ MeV using the FASTSUM Generation 2L anisotropic $N_f = 2 + 1$ ensembles. The use of a basis of smeared operators allows the extraction of excited-state masses at zero temperature and an investigation of their thermal properties at non-zero temperature. We dind that the ground state signal is substantially improved by this variational approach at finite temperature. We also apply the time-derivative moments approach to the projected or optimal correlation functions at finite temperature.- 5 February 2025
- Published by Sissa Medialab Srl
- Vol. 466, 202
Open AccessAnisotropic excited bottomonia from a basis of smeared operators
Bottomonia play a crucial role in our understanding of the quark gluon plasma. We present lattice non-relativistic QCD calculations of bottomonia at temperatures in the range $T\in\left[47,\,380\right]$ MeV using the FASTSUM Generation 2L anisotropic $N_f = 2 + 1$ ensembles. The use of a basis of smeared operators allows the extraction of excited-state masses at zero temperature and an investigation of their thermal properties at non-zero temperature. We dind that the ground state signal is substantially improved by this variational approach at finite temperature. We also apply the time-derivative moments approach to the projected or optimal correlation functions at finite temperature. - Open Access
Anisotropic excited bottomonia from a basis of smeared operators
Bottomonia play a crucial role in our understanding of the quark gluon plasma. We present lattice non-relativistic QCD calculations of bottomonia at temperatures in the range $T \in [47, 380]$ MeV using the Fastsum Generation 2L anisotropic $N_f = 2 + 1$ ensembles. The use of a basis of smeared operators allows the extraction of excited-state masses at zero temperature and an investigation of their thermal properties at non-zero temperature. We find that the ground state signal is substantially improved by this variational approach at finite temperature. We also apply the time-derivative moments approach to the projected or optimal correlation functions at finite temperature.Open AccessAnisotropic excited bottomonia from a basis of smeared operators
Bottomonia play a crucial role in our understanding of the quark gluon plasma. We present lattice non-relativistic QCD calculations of bottomonia at temperatures in the range $T \in [47, 380]$ MeV using the Fastsum Generation 2L anisotropic $N_f = 2 + 1$ ensembles. The use of a basis of smeared operators allows the extraction of excited-state masses at zero temperature and an investigation of their thermal properties at non-zero temperature. We find that the ground state signal is substantially improved by this variational approach at finite temperature. We also apply the time-derivative moments approach to the projected or optimal correlation functions at finite temperature. - Open Access
- 23 January 2025
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2025 (1) , 1-25
Highly excited B, Bs and Bc meson spectroscopy from lattice QCD
A bstract: Excited state spectra of B , B s and B c mesons are computed using lattice QCD. Working with a large basis of carefully constructed, approximately-local $$ q\overline{q} $$ -like operators we determine a rich spectrum of states up to J = 4 in B , B s and B c , that can be grouped into patterns matching those of the quark model. In addition, hybrid-like states are identified at approximately 1500 MeV above the ground states in each of B , B s and B c , in a multiplet pattern already found in similar computations at a range of quark masses spanning light to bottom. This study is performed using an anisotropic, relativistic Wilson-clover action at a single spatial lattice spacing of a s ≈ 0.12 fm and with a light-quark mass corresponding to m π ≈ 391 MeV. We find good agreement with experimental results where known and discuss prospects for further work in interesting J P quantum numbers.- 23 January 2025
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2025 (1) , 1-25
Open AccessHighly excited B, Bs and Bc meson spectroscopy from lattice QCD
A bstract: Excited state spectra of B , B s and B c mesons are computed using lattice QCD. Working with a large basis of carefully constructed, approximately-local $$ q\overline{q} $$ -like operators we determine a rich spectrum of states up to J = 4 in B , B s and B c , that can be grouped into patterns matching those of the quark model. In addition, hybrid-like states are identified at approximately 1500 MeV above the ground states in each of B , B s and B c , in a multiplet pattern already found in similar computations at a range of quark masses spanning light to bottom. This study is performed using an anisotropic, relativistic Wilson-clover action at a single spatial lattice spacing of a s ≈ 0.12 fm and with a light-quark mass corresponding to m π ≈ 391 MeV. We find good agreement with experimental results where known and discuss prospects for further work in interesting J P quantum numbers. - Open AccessHighly excited $B$, $B_s$ and $B_c$ meson spectroscopy from lattice QCDExcited state spectra of $B$, $B_s$ and $B_c$ mesons are computed using lattice QCD. Working with a large basis of carefully constructed, approximately-local $q\bar{q}$-like operators we determine a rich spectrum of states up to $J=4$ in $B, B_s$ and $B_c$, that can be grouped into patterns matching those of the quark model. In addition, hybrid-like states are identified at approximately 1500 MeV above the ground states in each of $B, B_s$ and $B_c$, in a multiplet pattern already found in similar computations at a range of quark masses spanning light to bottom. This study is performed using an anisotropic, relativistic Wilson-clover action at a single spatial lattice spacing of $a_s\approx 0.12$ fm and with a light-quark mass corresponding to $m_π\approx 391$ MeV. We find good agreement with experimental results where known and discuss prospects for further work in interesting $J^P$ quantum numbers.Open AccessHighly excited $B$, $B_s$ and $B_c$ meson spectroscopy from lattice QCDExcited state spectra of $B$, $B_s$ and $B_c$ mesons are computed using lattice QCD. Working with a large basis of carefully constructed, approximately-local $q\bar{q}$-like operators we determine a rich spectrum of states up to $J=4$ in $B, B_s$ and $B_c$, that can be grouped into patterns matching those of the quark model. In addition, hybrid-like states are identified at approximately 1500 MeV above the ground states in each of $B, B_s$ and $B_c$, in a multiplet pattern already found in similar computations at a range of quark masses spanning light to bottom. This study is performed using an anisotropic, relativistic Wilson-clover action at a single spatial lattice spacing of $a_s\approx 0.12$ fm and with a light-quark mass corresponding to $m_π\approx 391$ MeV. We find good agreement with experimental results where known and discuss prospects for further work in interesting $J^P$ quantum numbers.
- Open Access
- 20 May 2024
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2024 (5) , 1-35
Radiative transitions in charmonium from lattice QCD
The coupling of various charmonium mesons to a photon is studied using lattice QCD, giving access to radiative form factors and transitions, and probing the mesons’ structure. Methods are developed which allow the robust determination of amplitudes, including those involving an excited state as well as multiple form factors, for a range of kinematics. These are applied in dynamical lattice QCD calculations using the distillation technique to compute the underlying three-point correlation functions. Form factors and amplitudes involving the low-lying charmonia, η c , J/ψ, χ c0 and $$ {\eta}_c^{\prime } $$ , are calculated, demonstrating the methods and providing the first dynamical lattice QCD results for some quantities.- 20 May 2024
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2024 (5) , 1-35
Open AccessRadiative transitions in charmonium from lattice QCD
The coupling of various charmonium mesons to a photon is studied using lattice QCD, giving access to radiative form factors and transitions, and probing the mesons’ structure. Methods are developed which allow the robust determination of amplitudes, including those involving an excited state as well as multiple form factors, for a range of kinematics. These are applied in dynamical lattice QCD calculations using the distillation technique to compute the underlying three-point correlation functions. Form factors and amplitudes involving the low-lying charmonia, η c , J/ψ, χ c0 and $$ {\eta}_c^{\prime } $$ , are calculated, demonstrating the methods and providing the first dynamical lattice QCD results for some quantities. - 15 March 2022
- Published by Office of Scientific and Technical Information (OSTI)
Hadron Spectroscopy with Lattice QCD
The status and prospects for investigations of exotic and conventional hadrons with lattice QCD are discussed. The majority of hadrons decay strongly via one or multiple decay-channels, including most of the experimentally discovered exotic hadrons. Despite this difficult challenge, the properties of several hadronic resonances have been determined within lattice QCD. To further discern the spectroscopic properties of various hadrons and to help resolve their nature we present our suggestions for future analytic and lattice studies.
- 15 March 2022
- Published by Office of Scientific and Technical Information (OSTI)
Hadron Spectroscopy with Lattice QCD
The status and prospects for investigations of exotic and conventional hadrons with lattice QCD are discussed. The majority of hadrons decay strongly via one or multiple decay-channels, including most of the experimentally discovered exotic hadrons. Despite this difficult challenge, the properties of several hadronic resonances have been determined within lattice QCD. To further discern the spectroscopic properties of various hadrons and to help resolve their nature we present our suggestions for future analytic and lattice studies.