Explanipedia

Dark photon in parity-violating electron scatterings Open

X. G. Wang, A. W. Thomas, Anthony G. Williams · 2025

Are Neutron Stars Rich In H-dibaryons? Open

Jesper Leong, A. W. Thomas, P.A.M. Guichon · 2025

Predictions in the superheavy region from the quark-meson coupling model QMCπ-III Open

Kay Marie M. Paglinawan, A. W. Thomas, P.A.M. Guichon, J. R. Stone · 2025

Constraints On the Dark Sector from Electroweak Precision Observables Open

B. M. Loizos, X. G. Wang, A. W. Thomas, M. J. White, Anthony G. Williams · 2025

Identifying chest-worn light logger adherence: a validation study Open

Carlyn Patterson Gentile, A. W. Thomas, Ryan Shah, Blanca Marquez de Prado, Nichelle Raj , et al. · 2025

Background: Light exposure plays an important role in overall health because it entrains circadian rhythms. Recent technological advances in wearable light loggers allow measurement daily light exposure habits. Using a chest worn light log…

Structure of the with Hamiltonian effective field theory Open

Fang-Chao Han, Zhan-Wei Liu, Derek B. Leinweber, A. W. Thomas · 2025

We investigate the internal structure of the Ω(2012)− by analyzing lattice QCD simulation and experimental data within Hamiltonian effective field theory, considering both JP=1/2− and 3/2− assignments. The couplings to the dominant decay c…

Dense matter in neutron stars with eXTP Open

Ang Li, Anna L. Watts, Guobao Zhang, Sébastien Guillot, Yan-Jun Xu , et al. · 2025

Exploring future water resources and uses considering water demand scenarios and climate change for the French Sèvre Nantaise basin Open

Léonard Santos, A. W. Thomas, Gaëlle Tallec, Laurent Mounereau, Aaron Bluche , et al. · 2025

Incorporating human influences within water resources modelling, in the context of global change, has proven to be a fruitful approach for improving the assessment of the impact of climate and water demand changes on hydrology and water de…

Relaxing constraints on a broad dark photon Open

NULL AUTHOR_ID, A. W. Thomas, X. G. Wang · 2025

We revisit the exclusion constraints on the parameters of a narrow dark photon set by direct experimental searches. We investigate how a dark photon with a larger decay width impacts these limits, in particular, in the case where the dark …

Evidence for and implications of a dark photon Open

X. G. Wang, A. W. Thomas · 2025

We performed the first global QCD analysis of electron-nucleon deep-inelastic scattering and related high-energy data by including the contribution from a dark photon. Our results revealed a significant reduction in $χ^2$ relative to the b…

Searching for the dark photon at the Future Circular Lepton Collider Open

X. G. Wang, A. W. Thomas · 2025

Exploring the <b>Ω</b> <sup>−</sup> spectrum in lattice QCD Open

Liam Hockley, Waseem Kamleh, Derek B. Leinweber, A. W. Thomas · 2025

We present an exploratory lattice QCD analysis of the Ω-baryon spectrum. Using a basis of only local smeared three-quark operators in a correlation matrix analysis, we report masses for the ground, first and second excited states of the J …

Understanding the nature of the resonance Open

Liam Hockley, Curtis D. Abell, Derek B. Leinweber, A. W. Thomas · 2025

We present a coupled-channel analysis of the JP=3/2+Δ-baryon spectrum, based in the framework of Hamiltonian effective field theory (HEFT). We construct a Hamiltonian which mixes quark model-like single-particle states and two-particle mes…

Predictions in the superheavy region from the quark-meson coupling model QMC$π$-III Open

Kay Marie M. Paglinawan, A. W. Thomas, P.A.M. Guichon, J. R. Stone · 2025

The Quark-Meson Coupling (QMC) model establishes a self-consistent relationship between the quark structure dynamics of a nucleon and the relativistic mean fields that arise within the nuclear medium. The model has been successful in calcu…

Reflections on Chiral Symmetry Within QCD Open

A. W. Thomas · 2025

The fact that chiral symmetry is a crucial feature of the strong force was realized before the discovery of quantum chromodynamics. However, the full power it exerts on the structure of the nucleon only became apparent afterwards. We prese…

Are Neutron Stars Rich in H-dibaryons? Open

Jesper Leong, A. W. Thomas, P.A.M. Guichon · 2025

The possible existence of an H-dibaryon near the $Λ-Λ$ threshold has still not been decided experimentally. This raises the question of the potential effects on neutron stars if it does exist. We explore the consequences within the quark-m…

Heavy Neutron Star Phenomenology with an H-dibaryon Open

Jesper Leong, A. W. Thomas, P.A.M. Guichon · 2025

The equation of state for dense nuclear matter in $β$-equilibrium is explored including the possibility of a doubly-strange H-particle. Consistent with experimental constraints, the mass of the H in free space is taken to be near the $Λ\, …

Nucleon resonance structure to 2 GeV and the nature of the Roper Open

Shiryo Owa, Derek B. Leinweber, A. W. Thomas · 2025

The study of the spectrum of excited states of the nucleon is vital to our understanding of how QCD is realized in the baryon spectrum. Using a simultaneous analysis of the pion nucleon scattering data up to 2 GeV as well as the results of…

Étude HMUC : Rapport Phase 4. Quantification des volumes prélevables et programme d’actions Open

Léonard Santos, A. W. Thomas, Laurent Mounereau, Guillaume Thirel · 2025

Spectral parameters of the $ρ$ resonance from lattice QCD Open

Zhengli Wang, Derek B. Leinweber, Chuan Liu, Liuming Liu, Peng Sun , et al. · 2025

We present a lattice QCD investigation of the $ρ$ resonance using nine $N_f = 2 + 1$ Wilson-Clover ensembles with three lattice spacings and various pion masses ranging from $135$ to $320$ MeV. For each ensemble, a large number of finite v…

Constraints on the model from global QCD analysis Open

X. G. Wang, N. T. Hunt-Smith, Wally Melnitchouk, N. Sato, A. W. Thomas · 2025

We perform the first global QCD analysis of electron-nucleon deep-inelastic scattering and related high-energy data including the beyond the Standard Model U(1)B−L gauge boson, Z′. Contrary to the dark photon case, we find no improvement i…

Study of the pion-mass dependence of $\rho$-meson properties in lattice QCD Open

Kang Yu, Yan Li, Jia-Jun Wu, Derek B. Leinweber, A. W. Thomas · 2025

Challenges in the extraction of physics beyond the Standard Model from electron scattering Open

X. G. Wang, A. W. Thomas · 2024

Precise measurements of electron and positron scattering, including parity violation, offer great promise in the search for physics beyond the Standard Model (SM). In this context it is crucial to understand the corrections which might ari…

Pion photoproduction of nucleon excited states with Hamiltonian effective field theory Open

Yu Zhuge, Zhan-Wei Liu, Derek B. Leinweber, A. W. Thomas · 2024

We refine our previous calculation of multipole amplitude E0+ for pion photoproduction process, γN→πN. The treatment of final-state interactions is based upon an earlier analysis of pion-nucleon scattering within Hamiltonian effective fiel…

New Data-Driven Constraints on the Sign of Gluon Polarization in the Proton Open

N. T. Hunt-Smith, Christopher Cocuzza, Wally Melnitchouk, N. Sato, A. W. Thomas , et al. · 2024

Recently, the possible existence of negative gluon helicity Δg has been observed to be compatible with existing empirical constraints, including from jet production in polarized proton-proton collisions at the Relativistic Heavy Ion Collid…

Maximum likelihood estimation for left-truncated log-logistic distributions with a given truncation point Open

Markus Kreer, Ayşe Kızılersü, Jake Guscott, Lukas Christopher Schmitz, A. W. Thomas · 2024

For a sample $$X_1, X_2,\ldots X_N$$ of independent identically distributed copies of a log-logistically distributed random variable X the maximum likelihood estimation is analysed in detail if a left-truncation point $$x_L>0…

Exploring the $ Ω^- $ spectrum in lattice QCD Open

Liam Hockley, Waseem Kamleh, Derek B. Leinweber, A. W. Thomas · 2024

We present an exploratory lattice QCD analysis of the $ Ω$-baryon spectrum. Using smeared three-quark operators in a correlation matrix analysis, we report masses for the ground, first and second excited states of the $ J^P = 1/2^\pm,\, 3/…

Neutrino mean free path in neutron stars in the presence of hyperons Open

Jesper Leong, Parada T. P. Hutauruk, A. W. Thomas · 2024

We investigate the neutrino elastic differential cross-section (NDCS) and\ncorresponding mean free path for neutral current scattering in the dense matter\nof a neutron star. A wide range of observed neutron star (NS) masses is\nconsidered…

Excluded volume effects on cold neutron star phenomenology Open

Jesper Leong, A. W. Thomas, P.A.M. Guichon · 2024

International audience

Pion photoproduction of nucleon excited states with Hamiltonian effective field theory Open

Yu Zhuge, Zhan-Wei Liu, Derek B. Leinweber, A. W. Thomas · 2024

We refine our previous calculation of multipole amplitude $E_{0+}$ for pion photoproduction process, $γN\rightarrowπN$. The treatment of final-state interactions is based upon an earlier analysis of pion-nucleon scattering within Hamiltoni…

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