Article
Astronomy & Astrophysics
P. A. Boyle, F. Erben, J. M. Flynn, V. Gulpers, R. C. Hill, R. Hodgson, A. Juttner, F. O. Hogain, A. Portelli, C. T. Sachrajda
Summary: We perform the first calculation of the electromagnetic form factor V(z) for the long-distance contributions to the K+ -> pi+e+e- decay amplitude using physical light-quark masses. The calculation is done on a 2 + 1 flavor domain wall fermion ensemble with a lattice spacing of a-1 = 1.730(4) GeV. We implement a Glashow-Iliopoulos-Maiani cancellation by extrapolating to the physical charm-quark mass from three masses below charm. We obtain a value of V(z = 0.013(2)) = -0.87(4.44), providing a bound for its magnitude. The large statistical error is due to the stochastically estimated quark loops.
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
Giuseppe Clemente, Arianna Crippa, Karl Jansen
Summary: This study proposes to use noisy-intermediate-scale-quantum-era quantum devices to compute short distance quantities in (2 + 1)-dimensional QED, and combine them with large volume Monte Carlo simulations and perturbation theory. By performing quantum computations, the mass gap in the small and intermediate regime can be reliably resolved and matched with corresponding results from Monte Carlo simulations.
Article
Astronomy & Astrophysics
Shirley Weishi Li, Peter Lowdon, Orlando Oliveira, Paulo J. Silva
Summary: The existence of BRST symmetry in non-perturbative QCD imposes constraints on the ghost and gluon spectra, but this interconnection is violated in actual data, indicating that continuum and current lattice formulations in Landau gauge represent two distinct realisations of Yang-Mills theory.
Article
Physics, Particles & Fields
Mattia Dalla Brida, Leonardo Giusti, Tim Harris, Davide Laudicina, Michele Pepe
Summary: This study presents a strategy based on the step-scaling technique to nonperturbatively study thermal QCD up to very high temperatures, specifically focusing on computing flavour non-singlet meson screening masses in a theory with three massless quarks. Chiral symmetry restoration is observed in the results, with deviations in meson screening masses not explained by the known leading term in the QCD coupling constant g. The research findings provide insight into the difficulties in matching non-perturbative lattice results at lower temperatures with the behavior at asymptotically high temperatures.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Francesco Bigazzi, Alessio Caddeo, Tommaso Canneti, Aldo L. Cotrone
Summary: In this study, the steady-state velocity of expanding vacuum bubbles nucleated within chiral finite temperature first-order phase transitions in strongly coupled large N QCD-like models is determined using holographic correspondence as a tool. The friction force exerted by the plasma on the bubbles and the steady-state velocity are calculated. The phase transitions are related to changes in the embedding of flavor branes probing the black hole background in a top-down holographic description.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Salvatore Cali, Kevin Eckert, Jochen Heitger, Francesco Knechtli, Tomasz Korzec
Summary: The study focuses on the effects of the charm quark in the sea on the decay constants of charmonium and heavy meson masses. Results show that sea charm quark effects on the decay constants of charmonium are below 1% and the decoupling of charm quarks works well up to energies of about 500 MeV.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
C. Alexandrou, S. Bacchio, G. Bergner, M. Constantinou, M. Di Carlo, P. Dimopoulos, J. Finkenrath, E. Fiorenza, R. Frezzotti, M. Garofalo, K. Hadjiyiannakou, B. Kostrzewa, G. Koutsou, K. Jansen, V Lubicz, M. Mangin-Brinet, F. Manigrasso, G. Martinelli, E. Papadiofantous, F. Pittler, G. C. Rossi, F. Sanfilippo, S. Simula, C. Tarantino, A. Todaro, C. Urbach, U. Wenger
Summary: In this study, a calculation of the up, down, strange, and charm quark masses was conducted within the lattice QCD framework using twisted-mass fermion action. Scale setting with various quantities was used to check for finite lattice spacing effects, confirming compatible results in the continuum limit. Nonperturbative quark mass renormalization was performed using the RI'-MOM method, with determination of quark masses based on physical observables from the meson and baryon sectors.
Article
Physics, Particles & Fields
Adamu Issifu, Francisco A. A. Brito
Summary: This paper develops models for phenomenological particle physics based on the string analogy of particles. These models can be used to investigate various phenomenological aspects, including confinement, deconfinement, chiral condensate, QGP phase transitions, and the evolution of the early universe. Additionally, properties such as scalar glueball mass, gluon mass, glueball-meson mixing states, QCD vacuum, and color superconductivity can also be explored using these model frameworks. The paper concludes by using one of the models to describe the phenomenon of color confinement among glueballs. These models are built upon the modified Dirac-Born-Infeld (DBI) action for open strings with endpoints on a Dp-brane or brane-anti-brane at a tachyonic vacuum.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Guo-yuan Huang, Shun Zhou
Summary: This paper calculates the running fermion masses by considering both experimental results and theoretical calculations, quantifying uncertainties and identifying two main sources of uncertainties, as well as highlighting correlations among running parameters in some cases. The final results of running fermion masses at several representative energy scales are provided for further applications.
Article
Astronomy & Astrophysics
Adam Virgili, Waseem Kamleh, Derek B. Leinweber
Summary: The Landau-gauge quark propagator is calculated and analyzed using overlap valence fermions on 2+1-flavour dynamical clover fermion gauge fields from the PACS-CS collaboration. The obtained mass and renormalization functions are examined and compared with results from O(a)-improved Wilson fermions on 2-flavour dynamical gauge fields.
Article
Computer Science, Interdisciplinary Applications
Andre H. Hoang, Christopher Lepenik, Vicent Mateu
Summary: This article presents the REvolver library, a C++ tool for renormalization group evolution and automatic flavor matching of the QCD coupling and quark masses, as well as precise conversion between various quark mass renormalization schemes. The library also allows renormalization group evolution for complex renormalization scales and can be accessed through Mathematica and Python interfaces.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Astronomy & Astrophysics
Jan M. Pawlowski, Manuel Scherzer, Christian Schmidt, Felix P. G. Ziegler, Felix Ziesche
Summary: We propose a novel simulation strategy for Yang-Mills theories with a complex coupling, based on the Lefschetz thimble decomposition. This approach can potentially be adapted to QCD at finite density and real-time simulations, offering a solution to sign problems in Monte Carlo calculations within models with complex actions. Our algorithm demonstrates exponential improvements over standard reweighting approaches, despite facing a residual sign problem.
Article
Astronomy & Astrophysics
Xiao-Hui Chen, Qi-Nan Wang, Wei Chen, Hua-Xing Chen
Summary: This study investigates the mass spectra of N Omega dibaryons in different channels and predicts the existence of a bound state in the S-5(2) channel. The results suggest that N Omega dibaryons in the S-3(1) channel may decay directly into final states in S wave. This research provides insights into the potential identification of these N Omega dibaryons in future relativistic heavy-ion collision experiments.
Article
Astronomy & Astrophysics
Nolan Miller, Logan Carpenter, Evan Berkowitz, Chia Cheng Chang, Ben Horz, Dean Howarth, Henry Monge-Camacho, Enrico Rinaldi, David A. Brantley, Christopher Korber, Chris Bouchard, M. A. Clark, Arjun Singh Gambhir, Christopher J. Monahan, Amy Nicholson, Pavlos Vranas, Andre Walker-Loud
Summary: The study involves subpercent scale determination using the omega baryon mass and gradient-flow methods. Results show that the dominant uncertainty is stochastic uncertainty, with a clear path towards improved precision in w(0) through the Budapest-Marseille-Wuppertal Collaboration.
Article
Astronomy & Astrophysics
F. Pinto-Gomez, F. De Soto, M. N. Ferreira, J. Papavassiliou, J. Rodriguez-Quintero
Summary: We present new results for the three-gluon vertex obtained from a large-scale lattice simulation in the Landau gauge. The simulation evaluates the transversely projected vertex using a special tensorial basis, with form factors parametrized in terms of Bose-symmetric variables. Interestingly, the form factors primarily depend on a single kinematic variable, the sum of the squares of the three incoming four-momenta. This property, known as planar degeneracy, allows for a simplified and compact description of the data, suitable for future numerical applications. Confirming this property through a detailed study of specific configurations, we find that a semi-perturbative analysis accurately reproduces the lattice findings when a gluon mass is included to eliminate spurious divergences. (c) 2023 Published by Elsevier B.V. This is an open access article under the CC BY license (http:// creativecommons .org /licenses /by /4 .0/). Funded by SCOAP3.
Article
Physics, Multidisciplinary
Y. -Z Xu, K. Raya, Z. -F Cui, C. D. Roberts, J. Rodriguez-Quintero
Summary: Ensembles of model-independent representations of the pion generalized parton distribution (GPD) are developed using existing pion+nucleus Drell-Yan and electron+pion scattering data. This leads to a data-driven prediction for the pion mass distribution form factor, ?2p.
CHINESE PHYSICS LETTERS
(2023)
Article
Astronomy & Astrophysics
P. G. Ortega, J. Segovia, D. R. Entem, F. Fernandez
Summary: The recently discovered T-cc(+) is evaluated as a DD* molecular structure in the J(P) = 1(+) sector. A coupled-channels calculation in charged basis, considering the (DD)-D-0*(+), D+D*(0) and D*D-0*(+) channels, is done in the framework of a constituent quark model that successfully described other molecular candidates in the charmonium spectrum such as the X(3872). The T-cc(+) is found as a (DD)-D-0*(+) molecule (87%) with a binding energy of 387 keV/c(2) and a width of 81 keV, in agreement with the experimental measurements. The quark content of the state forces the inclusion of exchange diagrams to treat indistinguishable quarks between the D mesons, which are found to be essential to bind the molecule. The (DD0)-D-0 pi(+) line shape, scattering lengths and effective ranges of the molecule are also analyzed, which are found to be in agreement with the LHCb analysis. We search for further partners of the T-cc(+) in other charm and bottom sectors, finding different candidates. In particular, in the charm sector we find a shallow J(P) = 1(+) D+D*(0) molecule (83%), dubbed T'(cc), just 1.8 MeV above the T-cc(+) state. In the bottom sector, we find an isoscalar and an isovector J(P) = 1(+) bottom partners, as BB* molecules lying 21.9 MeV/c(2) (I = 0) and 10.5 MeV/c(2) (I = 1), respectively, below the (BB)-B-0*(+) threshold. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Article
Astronomy & Astrophysics
A. C. Aguilar, F. De Soto, M. N. Ferreira, J. Papavassiliou, F. Pinto-Gomez, C. D. Roberts, J. Rodriguez-Quintero
Summary: Continuum and lattice analyses have discovered a mass-scale in the gluon two-point Schwinger function, indicating the presence of a Schwinger mechanism for gauge boson mass generation in quantum chromodynamics (QCD). By using numerical simulations of lattice-regularised QCD, the researchers established with high confidence the existence of a dynamically-generated, massless, colour-carrying, scalar gluon+gluon correlation, confirming the conjectured origin of the gluon mass scale.
Article
Physics, Multidisciplinary
Pei-Lin Yin, Yin-Zhen Xu, Zhu-Fang Cui, Craig D. Roberts, Jose Rodriguez-Quintero
Summary: This article introduces an algebraic scheme that predicts all PDFs of a hadron at any higher scale, using a given hadron's valence parton PDFs. Furthermore, it presents a model-independent identity that relates the strength of the proton's gluon helicity PDF to other polarized quark PDFs and valence quark momentum fraction.
CHINESE PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Yin-Zhen Xu, Jorge Segovia
Summary: Within the framework of quantum chromodynamics, we studied the electromagnetic form factors of pseudoscalar and vector mesons with different hidden flavor, comparing the results with the single-pole vector meson dominance (VMD) model. We found that the charge radius of the vector meson is larger than that of the pseudoscalar meson. As the current-quark mass increases, the electric form factor of the vector meson approaches that of the pseudoscalar meson and deviates from the prediction of the VMD model.
Article
Physics, Multidisciplinary
J. M. Morgado Chavez, V. Bertone, F. De Soto, M. Defurne, C. Mezrag, H. Moutarde, J. Rodriguez Quintero, J. Segovia
Summary: In this study, we deeply analyze virtual Compton scattering on pions at a future electron-ion collider, carried out through the Sullivan process. The relevant amplitude is parametrized by generalized parton distributions. By utilizing state-of-the-art models and incorporating effective leading-order scale evolution, we evaluate the amplitude for this process and examine the structure of pions in the context of electron-ion colliders. We estimate the expected event-rates for the Sullivan process, demonstrating that deeply virtual Compton scattering on pions can be measured at forthcoming experimental facilities and highlighting the significant role of gluons in describing pions and modulating the event-rates.
Article
Physics, Multidisciplinary
Michael Riberdy, Cedric Mezrag, Jorge Segovia
Summary: In this paper, we introduce a method for identifying individual quark helicity projection nucleon fluctuations by parametrizing projected matrix elements. We then derive the overlap representation of Generalized Parton Distributions (GPDs) using specific quark orbital angular momentum Light Front Wave Functions. We further investigate the limits and sum rules of these GPDs to express nucleonic Parton Distribution Functions, Electromagnetic Form Factors, and the expectation value of the electromagnetic radius.
Article
Astronomy & Astrophysics
Alvaro Duenas-Vidal, Jorge Segovia
Summary: The lightlike limit of boosted black hole solutions with one angular momentum in D >= 4 dimensions is investigated. Boost is performed parallel to the angular momentum and the lightlike limit is achieved through perturbative expansions. It is shown that the lightlike limit cannot extend inside the ring singularity for D = 4 and D > 5. In the case of D = 5, the emergence of trapped surfaces in head-on collision is discussed. It is found that, within the performed perturbative analysis, a trapped surface with the topology R x S1 x S1 seems to appear over the past light cone of the collision below a critical value of the Kerr parameter.
Article
Astronomy & Astrophysics
B. Almeida-Zamora, J. J. Cobos-Martinez, A. Bashir, K. Raya, J. Rodriguez-Quintero, J. Segovia
Summary: Inspired by a recent algebraic model, this study extends the model to the case of vector mesons, providing a description of their internal structure. By calculating the leading-twist light-front wave functions and their connection with parton distribution amplitudes, the wave functions of the mesons are obtained. Some interesting results include the algebraic derivation of transverse light-front wave functions but the need for an intermediate step for longitudinal wave functions, differences observed between light and heavy vector mesons, and the x and p(perpendicular to)^(2) dependence of the wave functions.
Article
Physics, Nuclear
U. Taboada-Nieto, P. G. Ortega, D. R. Entem, F. Fernandez, J. Segovia
Summary: The European Organization for Nuclear Research (CERN) has approved a unique QCD facility that combines an updated version of the CERN SPS external M2 beam line with the COMPASS experiment's universal spectrometer. The facility aims to map out the complete spectrum of excited kaons with unprecedented precision using highly intense and energetic kaon beams. This will have a significant impact on both low-energy QCD phenomenology and high-energy particle processes. The kaon spectrum is computed in this study using a constituent quark model and the results are compared with existing literature for further analysis.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Astronomy & Astrophysics
Bilgai Almeida Zamora, Enrique Carreon Martinez, Jorge Segovia, J. J. Cobos-Martinez
Summary: The researchers constructed a contact interaction model for eta and eta' mesons and calculated their static properties and transition form factors. The model provided an excellent description of the static properties, but disagreed with experimental data and perturbative QCD prediction for the transition form factors at high momentum.
Article
Astronomy & Astrophysics
B. Martin-Gonzalez, P. G. Ortega, D. R. Entem, F. Fernandez, J. Segovia
Summary: The properties of the B-c meson family are still uncertain due to the lack of understanding of their formation and decay mechanisms. Unlike other heavy quarkonia, the B-c mesons are more stable because they cannot annihilate into gluons. In this study, we use a well-established quark model to calculate the radiative decay widths and hadronic transition rates of cb over bar states below the BD threshold, providing potential signals for the discovery of excited B-c states.
