Article
Physics, Particles & Fields
B. Moussallam
Summary: Amplitudes of a specific form in the computation of the muon g-2 have been studied and validated against experimental data from the KLOE collaboration. The derivation process involves two subtraction parameters and results in a good fit with the experimental data.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Nuclear
L. Moschini, N. K. Timofeyuk, R. C. Johnson
Summary: In this study, a numerical quantification of a perturbative correction to the adiabatic distorted wave approximation theory was provided and compared with continuum-discretized coupled channel predictions. The perturbative correction involves an additional, nonlocal term in the effective deuteron-target ADWA potential in the entrance channel.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2021)
Article
Health Care Sciences & Services
Peter Elek, Petra Fadgyas-Freyler, Balazs Varadi, Balazs Mayer, Antal Zemplenyi, Marcell Csanadi
Summary: This study examined the impact of the COVID-19 pandemic on breast cancer screening, diagnosis, and treatment in Hungary. The number of mammography examinations decreased significantly in the second quarter of 2020 and gradually returned to normal levels by the third quarter. However, throughout the period from the fourth quarter of 2020 to the second quarter of 2021, there was a persistent reduction. This decline was attributed to both temporary suspensions of screening and lower participation rates during the pandemic waves. The study also found that new breast cancer diagnoses and mastectomy surgeries were consistently below usual levels during this period, with a lag in response compared to the decline in screenings.
Article
Physics, Nuclear
Qu-Zhi Li, Yao Ma, Wen-Qi Niu, Yu-Fei Wang, Han-Qing Zheng
Summary: Extensive dynamical N/D calculations are conducted for low energy pi N scatterings in the S-11 channel, with analysis performed on the singular behavior of the partial wave amplitude in the complex s plane. The dispersion representation for the phase shift is found to require modification in the case of pi N scatterings. The subthreshold resonance N* (890) is found to survive with limited reliance on the dynamical inputs.
Article
Thermodynamics
A. M. Lipanov, S. A. Karskanov
Summary: The paper proposes a right-hand side method for numerically solving nonlinear partial differential equations. It considers a class of differential equations with partial time derivatives on the left-hand side. The solutions of these equations are represented by continuous functions of time and spatial coordinates. By integrating over time, original differential equations are written in an implicit difference form. The algorithm of the method is given, and the results of solving one-dimensional and two-dimensional equations show good agreement between numerical and theoretical solutions. The advantages of the method, including saving computer time and resources, are outlined and its areas of use are determined.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Geochemistry & Geophysics
Nicholas Harmon, Catherine A. Rychert, Yujiang Xie, Petros Bogiatzis
Summary: In this study, the authors proposed finite-frequency kernels for scattered waves that improve the recovery of seismic velocity discontinuities, especially for shallow discontinuities. These kernels can also be used to recover the curvature of shallow discontinuity undulations and show potential for recovering the magnitude of the velocity contrast across a discontinuity.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Acoustics
Guo-Xuan Xu, Pei-Yu Chen, Chih-Chung Huang
Summary: This study used high-frequency ultrasound dual-direction shear wave imaging to generate transverse and longitudinal shear waves in the human flexor carpi radialis tendon and obtained SWV maps from two directions. The results showed that the shear wave velocities of the tendon increased with tendon flexion, and the transverse shear wave velocity surpassed the longitudinal shear wave velocity in all cases.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2023)
Article
Geochemistry & Geophysics
Xichao Dong, Zewei Zhao, Yupei Wang, Tao Zeng, Jianping Wang, Yi Sui
Summary: This article proposes a new processing scheme for hand gesture recognition (HGR) based on 5-D feature cubes and introduces two novel CNN blocks. The presented method achieves high recognition rates on a large radar dataset.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Automation & Control Systems
Constantinos Kitsos, Mathieu Bajodek, Lucie Baudouin
Summary: This work focuses on estimating an unknown source coefficient and the solution to a 1-D wave equation using exponentially convergent state observers. The coefficient is assumed to be polynomial and dependent only on the space variable. The main observation information for this inverse problem is the value of the solution and its higher order spatial derivatives in a subinterval of the domain. A novel indirect approach involving an infinite-dimensional state transformation is introduced to estimate the source coefficient in this infinite-dimensional setting. It is proven that a composite observer consisting of an internal observer and a boundary observer can provide the estimation of the solution everywhere, with observer convergence proven through Lyapunov analysis. An extension to the identification of a potential in the wave equation is also considered.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2023)
Article
Psychology, Clinical
Joanne Adams, Melissa Baxter
Summary: This paper explores the use of a systemic reflexive exercise called Collective Cut-Outs, focusing on its methodology and usefulness in clinical mental health contexts. It also highlights the experiences of frontline BAME clinicians during the COVID-19 pandemic and discusses clinical challenges and collective resilience. The paper provides a case study of the exercise in a supervisory context and emphasizes the importance of reflexive spaces for personal and professional development.
JOURNAL OF FAMILY THERAPY
(2022)
Article
Food Science & Technology
Giuseppe Bonifazi, Giuseppe Capobianco, Riccardo Gasbarrone, Silvia Serranti
Summary: The study evaluated different multivariate classification methods for hyperspectral images in the SWIR range for quality control of pistachio nuts and detection of contaminants. Six material classes were investigated, and PCA was used to explore the acquired images. Various classification methods were employed, with PCA-kNN showing the best discrimination ability. The results demonstrate the potential of SWIR-HSI technology and multivariate analysis for contaminant detection in pistachios.
Proceedings Paper
Engineering, Manufacturing
Yang Cuicui, Zhuo Zhihai, Qiao Xingshuai, Shan Tao
Summary: This paper presents a method based on 2-D synthetic aperture radar (SAR) imaging to recognize nine kinds of static hand gestures representing the numbers 1-9. Experimental results demonstrate that the proposed method can guarantee a promising recognition accuracy.
SEVENTH ASIA PACIFIC CONFERENCE ON OPTICS MANUFACTURE (APCOM 2021)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Y. Kato, W. Kubo, S. Harisaki, M. Anan, K. Tsuda, K. Sato, I Owada, T. Maenaka
Summary: The crucial factor determining the increase in multicharged ion current in ECRIS is not only the density limit of ordinary wave and right-hand cutoffs, but also the higher density of left-hand cutoff. In addition to conventional methods like increasing frequency and magnetic field strength, advanced high-frequency resonance and lower frequency waves may help overcome limitations.
19TH INTERNATIONAL CONFERENCE ON ION SOURCES - ICIS2021
(2022)
Article
Physics, Multidisciplinary
Alexandre Salas-Bernardez, Felipe J. Llanes-Estrada, Jose Antonio Oller, Juan Escudero-Pedrosa
Summary: Effective Field Theories (EFTS) constructed as derivative expansions in powers of momentum provide a controllable approximation to strong dynamics, but their predictive power towards new physics at higher energy scales is limited. Unitarized chiral perturbation theory techniques have been devised to extend the reach of EFT, but uncertainties in these extensions have not been thoroughly addressed.
Article
Physics, Multidisciplinary
J. M. Alarcon, J. A. Oller
Summary: This article reexamines the calculation of energy density of a spin 1/2 fermion many-body system using ladder diagrams, with an emphasis on arbitrary two-body scattering amplitudes in vacuum. It provides a partial-wave decomposition of in-medium two-body scattering amplitudes, as well as an expression for calculating the energy density in a partial-wave amplitude expansion. The study resolves the case of contact interactions and shows that renormalized results can be obtained directly in terms of scattering data parameters within cutoff regularization.
Article
Astronomy & Astrophysics
D. Blas, J. Martin Camalich, J. A. Oller
Summary: In this study, we investigate graviton-graviton scattering in partial-wave amplitudes by unitarizing their Born terms. By introducing an S-matrix associated with this resummation that is free of infrared divergences, based on unitarity and analyticity, we are able to apply S-matrix techniques. A scalar graviton-graviton resonance called the graviball is obtained as a pole in the nonperturbative S-wave amplitude with vacuum quantum numbers. Its resonant effects along the physical real-saxis may peak at values substantially lower than the UV cutoff squared of the theory, potentially leading to phenomenological consequences at relatively low-energy scales, similar to resonance phenomena in QCD.
Article
Astronomy & Astrophysics
Pablo G. Ortega, David R. Entem, Francisco Fernandez
Summary: In this study, we investigate the possible existence of the J(PC) = 1(+-) counterpart of the X(3872) state using a coupled-channels calculation within a constituent quark model. The aim is to confirm the existence of the so-called (X) over tilde (3872) state observed by the COMPASS Collaboration. Two states are found in the energy region of the (X) over tilde (3872) signal, showing a nearly equal mixture of the c (c) over bar2(1)P(1) state and D*(D) over bar(*) channels. The study provides predictions of strong and radiative decays to further elucidate the existence of these structures.
Article
Astronomy & Astrophysics
Pablo G. Ortega, Jorge Segovia, David R. Entem, Francisco Fernandez
Summary: The recent discovery of the D-s0(2590)(+) meson and its analysis of meson-meson channels effects suggest a non-negligible coupling with the D-(*())K-(*()) channel, resulting in a lower mass than predicted. This study investigates the impact of incorporating nearby meson-meson channels on the mass of the bare c (s) over bar through a coupled-channels calculation.
Article
Physics, Particles & Fields
D. Blas, J. Martin Camalich, J. A. Oller
Summary: A method to unitarize the scattering amplitude produced by infinite-range forces is developed and applied to Born terms. The study finds a scalar graviton-graviton resonance called the graviball, and discusses its corrections in the gravitational effective field theory. Additionally, this method is also applicable to Coulomb scattering and an energy-dependent potential based on the Coulomb one.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Pablo G. Ortega, David R. Entem, Francisco Fernandez
Summary: Hidden-charm pentaquark-like P-psi-s(Lambda)(4459)(0) and P-psi-s(Lambda)(4338) resonances are studied as molecular meson-baryon structures in a constituent quark model. The masses and widths of these states are found to be consistent with experimental measurements in a coupled-channels calculation. Other candidates in different channels and sectors are also explored. The formalism is further extended to study pentaquarks in the charm and bottom sectors.
Article
Astronomy & Astrophysics
J. A. Oller
Summary: This study compares nonrelativistic Coulomb scattering with two unitarization methods for infinite-range forces and finds that one method accurately reproduces the exact solution, while the other method fails to reproduce the known solution and leads to zero binding energy.
Article
Physics, Nuclear
S. K. Saha, D. R. Entem, R. Machleidt, Y. Nosyk
Summary: We present local, position-space chiral NN potentials through four orders of chiral effective field theory. Our potentials accurately reproduce the NN data below 190 MeV and show substantial agreement with the phenomenological AV18 potential in the intermediate range. These potentials provide a solid basis for systematic ab initio calculations of nuclear structure and reactions, and may help solve outstanding problems in microscopic nuclear structure.
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
Physics, Nuclear
J. M. Alarcon, J. A. Oller
Summary: We investigate the effect of P-wave interactions on the energy of a degenerate gas of spin-1/2 fermions. By summing the ladder diagrams, we calculate the energy per particle in the many-body system and obtain a renormalized result. It is found that the resonance poles caused by P-wave interactions contradict the Hermiticity of the Hamiltonian, resulting in the instability of unpolarized spin-1/2 fermionic normal matter.
Article
Astronomy & Astrophysics
D. Iglesias-Ferrero, D. R. Entem, F. Fernandez, P. G. Ortega
Summary: This study investigates the production of single-charmed baryons in p (p) over bar collisions using a constituent quark model. Predictions on the total cross sections are provided, which can be useful for future experimental searches.
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.
Article
Astronomy & Astrophysics
Ze-Qiang Wang, Xian-Wei Kang, J. A. Oller, Lu Zhang
Summary: This study investigates the composition and importance of the x-x- ??? KK?? and x-ri ??? KK?? components in the f0(980) and a0(980) resonances. It is found that the meson-meson components dominate in the f0(980) while they are subdominant in the a0(980) resonance. The study also emphasizes the need to distinguish between bare and dressed couplings and widths in the parameterization.
Article
Astronomy & Astrophysics
Zhi-Hui Guo, J. A. Oller
Summary: The recently discovered fully charmed tetraquark candidate X(6900) was analyzed using various theoretical approaches, showing that the two-meson components do not play dominant roles in X(6900). Resonance poles determined from the coupled-channel study were found to be consistent with experimental analyses, and a new narrow resonance X(6825) was predicted below the chi(c0)chi(c0) threshold.
Article
Astronomy & Astrophysics
Nelson R. F. Braga, Octavio C. Junqueira
Summary: This study investigates the influence of rotation on the transition temperature of strongly interacting matter produced in non-central heavy ion collisions. By using a holographic description of an AdS black hole, the authors extend the analysis to the more realistic case where the matter spreads over a region around the rotational axis. The results show the coexistence of confined and deconfined phases and are consistent with the concept of local temperature in rotating frames developed by Tolman and Ehrenfest.
Article
Astronomy & Astrophysics
Bing Sun, Jiachen An, Zhoujian Cao
Summary: This paper investigates the effect of gravitational constant variation on the propagation of gravitational waves. By employing two analytical methods, the study finds that variations in the gravitational constant result in amplitude and phase corrections for gravitational waves, and the time variation of the gravitational constant can be constrained through the propagation of gravitational waves.
Article
Astronomy & Astrophysics
Abdellah Touati, Zaim Slimane
Summary: This letter presents the first study of Hawking radiation as a tunneling process within the framework of non-commutative gauge theory of gravity. The non-commutative Schwarzschild black hole is reconstructed using the Seiberg-Witten map and the star product. The emission spectrum of outgoing massless particles is computed using the quantum tunneling mechanism. The results reveal pure thermal radiation in the low-frequency scenario, but a deviation from pure thermal radiation in the high-frequency scenario due to energy conservation. It is also found that noncommutativity enhances the correlations between successively emitted particles.
Article
Astronomy & Astrophysics
Shahar Hod
Summary: The travel times of light signals between two antipodal points on a compact star's surface are calculated for two different trajectories. It is shown that, for highly dense stars, the longer trajectory along the surface may have a shorter travel time as measured by asymptotic observers. A critical value of the dimensionless density-area parameter is determined for constant density stars to distinguish cases where crossing through the star's center or following a semi-circular trajectory on the surface has a shorter travel time as measured by asymptotic observers.