Article
Physics, Particles & Fields
Gunnar S. Bali, Markus Diehl, Benjamin Glaessle, Andreas Schaefer, Christian Zimmermann
Summary: This study evaluates nucleon four-point functions in lattice QCD to extract the first Mellin moment of double parton distributions in the unpolarized proton. Results show that a good statistical signal is obtained for almost all Wick contractions, and the dependence of the DPD Mellin moments on quark flavor and polarization is analyzed in detail. The validity of commonly used factorization assumptions is also investigated.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Gunnar S. Bali, Luca Castagnini, Markus Diehl, Jonathan R. Gaunt, Benjamin Glaessle, Andreas Schaefer, Christian Zimmermann
Summary: A lattice study of double parton distributions in the pion was conducted, revealing correlations in the spatial distribution and polarization of two partons, with patterns observed depending significantly on the quark mass. The assumption that double parton distributions approximately factorize into a convolution of single parton distributions was investigated.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Colin Egerer, Robert G. Edwards, Christos Kallidonis, Kostas Orginos, Anatoly Radyushkin, David G. Richards, Eloy Romero, Savvas Zafeiropoulos
Summary: In this study, the Distillation spatial smearing program was applied to improve the extraction of the unpolarized isovector valence PDF of the nucleon. By analyzing the matched ITD and directly matching the pITD to the PDF, a concerning deviation and DGLAP evolution were observed. The utility of distillation in such structure studies was further highlighted through observation and correction of this discrepancy.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Luigi Del Debbio, Tommaso Giani, Joseph Karpie, Kostas Orginos, Anatoly Radyushkin, Savvas Zafeiropoulos
Summary: This study extracts two nonsinglet nucleon Parton Distribution Functions from lattice QCD data for reduced Ioffe-time pseudodistributions. The analysis is performed within the NNPDF framework, considering data from different lattice ensembles and discussing in detail the treatment of systematics. A recipe for handling systematics is introduced and used for the extraction of light-cone PDFs.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Gavin K. C. Cheung, Christopher E. Thomas, David J. Wilson, Graham Moir, Michael Peardon, Sinead M. Ryan
Summary: Elastic scattering amplitudes for I = 0 DK and I = 0, 1 DK were calculated using lattice QCD. Interesting features and bound states were observed, but small P and D-wave DK amplitudes were found, along with resonances at higher energies in I = 0 DK.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Joseph Karpie, Kostas Orginos, Anatoly Radyushkin, Savvas Zafeiropoulos
Summary: In this study, continuum limit results for the unpolarized parton distribution function of the nucleon in lattice QCD are presented. The pseudo-PDF approach with Short Distance Factorization was utilized for the first time, and findings were compared with phenomenological determinations. The sGEVP technique was employed to optimize control over excited state contamination in calculations.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Review
Physics, Multidisciplinary
Luigi Del Debbio, Alberto Ramos
Summary: Lattice QCD has established itself as a mature field, providing precise descriptions of the standard model and determining essential quantities such as the strong coupling constant. In addition, lattice calculations will be crucial in future phenomenological studies.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2021)
Article
Astronomy & Astrophysics
Nikolai Husung, Peter Marquard, Rainer Sommer
Summary: This study investigates the spectral quantities in lattice QCD and determines the asymptotic behavior of their discretization errors. Various combinations of fermions and gauge actions are considered, and the asymptotic cutoff effects are analyzed. The study proposes the use of tree-level O(a2) improvement for both fermions and gauge actions to enhance the asymptotic behavior.
Article
Physics, Particles & Fields
Andrey Yu Kotov, Daniel Nogradi, Kalman K. Szabo, Lorinc Szikszai
Summary: In this study, we continue to investigate the dependence on the number of fermions by extending simulations to N-f = 7, 8, 9, 10. We also examine the N-f dependence of finite volume effects and a specific lattice artifact phase related to staggered fermions.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Tyler D. Blanton, Fernando Romero-Lopez, Stephen R. Sharpe
Summary: The study discusses the practical implementation of the formalism related to the finite-volume spectrum of systems of nondegenerate spinless particles, providing theoretical results and codes for implementing the three-particle quantization condition. Various issues, including modifying the cutoff function, decomposing the three-particle amplitude, expanding the threshold, and calculating predictions in chiral perturbation theory, are addressed in the study.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Santanu Mondal, Rajan Gupta, Sungwoo Park, Boram Yoon, Tanmoy Bhattacharya, Balint Joo, Frank Winter
Summary: By analyzing high-statistics data, better control over the systematic uncertainties in the calculation of the isovector momentum fraction, helicity moment, and transversity moment of the nucleon is achieved. The results for these moments are consistent with global fit values.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Sinead M. Ryan, David J. Wilson
Summary: Excited and exotic bottomonia spectrum were explored using lattice QCD, identifying highly excited states and supermultiplets corresponding to the quark model. Exotic spin-parity-charge-conjugation quantum numbers that cannot be formed from quark pairs alone were also identified. Single-meson operator constructions with good J(PC) in the continuum were used, with assigned continuum J(PC) for each level based on lattice irreps and dominant operator overlaps. States with dominant gluonic components were identified, forming a hybrid supermultiplet with specific J(PC) values approximately 1500 MeV above the ground-state eta(b), similar to previous computations with different quark systems.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Fernando Romero-Lopez, Akaki Rusetsky, Nikolas Schlage, Carsten Urbach
Summary: The paper presents a general method for deriving the energy shift of an interacting system of N spinless particles using nonrelativistic effective field theory, with relativistic corrections explicitly included. This method is applied to obtain the ground state of N particles and the first excited state of two and three particles to a certain order, based on the threshold parameters of relativistic scattering amplitudes. The resulting expressions are used to analyze the N-particle ground state energy shift in the complex phi (4) theory.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Luke Gayer, Nicolas Lang, Sinead M. Ryan, David Tims, Christopher E. Thomas, David J. Wilson
Summary: The scattering amplitudes of isospin-1/2 D pi are computed using lattice QCD, revealing a D-0* resonance pole strongly coupled to the S-wave D pi channel. This resonant state has a mass of approximately 2200 MeV and a width of around 400 MeV, consistently found below the mass of the D-s0*.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
B. B. Brandt, F. Cuteri, G. Endroedi, G. Marko, L. Sandbote, A. D. M. Valois
Summary: This work investigates the influence of magnetic fields on QCD medium in off-central heavy-ion collisions. By simulating the behavior of quarks in inhomogeneous magnetic fields, it is found that the magnetic field leads to non-trivial spatial features in the QCD medium, especially around the transition temperature. In addition, a leading-order chiral perturbation theory for the inhomogeneous background is constructed and compared with lattice results at low temperature.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)