S. Pacetti
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View article: Very High-Energy Cosmic Ray Particles from the Kerr Black Hole at the Galaxy Center
Very High-Energy Cosmic Ray Particles from the Kerr Black Hole at the Galaxy Center Open
After a just tribute to Guido Barbiellini, we show how the notion of a maximum force (Fmax=c4/4G≃3×1043 Newtons) present on the event horizon of a black hole (BH) can be used in conjunction with the Wilson area rule to obtain the surface c…
View article: Kerr Black Hole as a Pevatron at the Galaxy Center
Kerr Black Hole as a Pevatron at the Galaxy Center Open
Conventional general relativity supplies the notion of a vacuum tension and thus a maximum force Fmax=c4/4G≃3·1043 N that is realized for a black hole. In conjunction with the Wilson area rule, we are thus led to the surface confinement of…
View article: Tests of CP symmetry in entangled hyperon anti-hyperon pairs at BESIII
Tests of CP symmetry in entangled hyperon anti-hyperon pairs at BESIII Open
Decays of charmonium into hyperon and antihyperon pairs provide a pristine laboratory for exploring hyperon properties, such as their polarization and decay parameters, and for conducting tests of fundamental symmetries. This brief review …
View article: Isospin strikes back
Isospin strikes back Open
Assuming isospin conservation, the decay of a $c\bar c$ vector meson into the $Λ\barΣ^0+\mathrm{c.c.}$ final state is purely electromagnetic. At the leading order, the $c\bar c$ vector meson first converts into a virtual photon that, then …
View article: Very high energy cosmic ray particles from the Kerr black hole at the galaxy center
Very high energy cosmic ray particles from the Kerr black hole at the galaxy center Open
Conventional general relativity supplies the notion of a vacuum tension and thus a maximum force $F_{max}=c^4/4G\approx\ 3\times 10^{43}$ Newtons, that is realized for a black hole. In conjunction with the Wilson area rule, we are thus led…
View article: Analytical Inverse QCD Coupling Constant Approach and Its Result for αs
Analytical Inverse QCD Coupling Constant Approach and Its Result for αs Open
We propose a model for the QCD running coupling constant based on the analytical inverse QCD coupling constant concept with an additional regularization in the low momentum region. Analyticity in the q2-complex plane, where q is the four-m…
View article: Microscopic parametrization of the near threshold oscillations of the nucleon time-like effective electromagnetic form factors
Microscopic parametrization of the near threshold oscillations of the nucleon time-like effective electromagnetic form factors Open
We present an analysis of the recent near threshold BESIII data for the nucleon time-like effective form factors. The damped oscillation emerging from the subtraction of the dipole formula is treated in non-perturbative-QCD, making use of …
View article: Up and down the Riemann surfaces of the Λ baryon form factors
Up and down the Riemann surfaces of the Λ baryon form factors Open
The recent measurement of the modulus and phase of the ratio G Λ E / G Λ M , between the electric and the magnetic Λ form factors, performed by the BESIII experiment, offers the unique possibility of exploring for the first time ever the c…
View article: At the heart of the proton
At the heart of the proton Open
Two main findings on electromagnetic hadron form factors focussed a large interest of the hadron physics community in the recent years. One is the decrease of the electric to magnetic form factor ratio when the momentum transfer in electro…
View article: PARSIFAL: A toolkit for triple-GEM parametrized simulation
PARSIFAL: A toolkit for triple-GEM parametrized simulation Open
PARSIFAL (PARametrized SImulation) is a fast and reliable software tool that reproduces the complete response of a triple-GEM detector to the passage of a charged particle, taking into account the main physical effects. Starting from the d…
View article: General relativity versus dark matter for rotating galaxies
General relativity versus dark matter for rotating galaxies Open
A very general class of axially symmetric metrics in general relativity (GR) that includes rotations is used to discuss the dynamics of rotationally supported galaxies. The exact vacuum solutions of the Einstein equations for this extended…
View article: Track-based alignment for the BESIII CGEM detector in the cosmic-ray test
Track-based alignment for the BESIII CGEM detector in the cosmic-ray test Open
The Beijing Electron Spectrometer III (BESIII) is a multipurpose detector operating on the Beijing Electron Positron Collider II (BEPCII). After more than ten year's operation, the efficiency of the inner layers of the Main Drift Chamber (…
View article: General Relativity versus Dark Matter for rotating galaxies
General Relativity versus Dark Matter for rotating galaxies Open
A very general class of axially-symmetric metrics in general relativity (GR) that includes rotations is used to discuss the dynamics of rotationally-supported galaxies. The exact vacuum solutions of the Einstein equations for this extended…
View article: At the heart of baryonic matter the ARBUZ model favored by recent hadron form factor data
At the heart of baryonic matter the ARBUZ model favored by recent hadron form factor data Open
Data on electromagnetic form factors of proton, neutron, and $Λ$ from annihilation and scattering reactions are collected and interpreted in the frame of a generalized picture of the internal structure of baryons which holds in space-like …
View article: Theoretical and Experimental Essentials on Baryon Form Factors
Theoretical and Experimental Essentials on Baryon Form Factors Open
This brief review is a practical guide on the basic concepts, pivotal formulae, standard relations, and some unusual, often forgotten, but sometimes revealing features of baryons’ form factors. All available measured values of nucleon form…
View article: General Relativity and the Tully-Fisher Relation for Rotating Galaxies
General Relativity and the Tully-Fisher Relation for Rotating Galaxies Open
The flat limit of rotational velocity (vφ) approximately equal to the “edge”-velocity of a galaxy is related to the baryonic mass (MB) via the T-F relationship with n ≈ 4. We explore the connection between mass and the limiting velocity in…
View article: A Fit to the Available e+e− → Λc+Λ¯c− Cross Section Data Nearby Production Threshold by Means of a Strong Correction to the Coulomb Enhancement Factor
A Fit to the Available e+e− → Λc+Λ¯c− Cross Section Data Nearby Production Threshold by Means of a Strong Correction to the Coulomb Enhancement Factor Open
There are two available sets of data on the e+e−→Λc+Λ¯c− cross section at energies close to the production threshold, collected by the Belle and by the BESIII Collaborations. The measurement of the former, performed by means of the initial…
View article: The first exploration of the physical Riemann surfaces of the ratio $G_E^\Lambda/G_M^\Lambda$
The first exploration of the physical Riemann surfaces of the ratio $G_E^\Lambda/G_M^\Lambda$ Open
Recently, the BESIII experiment renewed the interest on baryon form factors\nby measuring the modulus and phase of the ratio $G_E^\\Lambda/G_M^\\Lambda$\nbetween the electric and the magnetic $\\Lambda$ form factors with unprecedented\nacc…
View article: Dynamical Properties of Baryons
Dynamical Properties of Baryons Open
The internal structure of composite particles is conveniently described in terms of form factors (FFs)—these are experimentally accessible in annihilation and scattering of elementary reactions, and are theoretically calculable by all mode…
View article: Analytic continuation of nucleon electromagnetic form factors in the time-like region
Analytic continuation of nucleon electromagnetic form factors in the time-like region Open
The possibility to compute nucleon electromagnetic form factors in the time-like region by analytic continuation of their space-like expressions, obtained in the framework of a generic model of nucleons, has been explored. We have develope…
View article: The cross section of $e^+e^- \to \Lambda \overline \Sigma{}^0+{\rm c.c.}$ as a litmus test of isospin violation in the decays of vector charmonia into $\Lambda \overline \Sigma{}^0+{\rm c.c.}$
The cross section of $e^+e^- \to \Lambda \overline \Sigma{}^0+{\rm c.c.}$ as a litmus test of isospin violation in the decays of vector charmonia into $\Lambda \overline \Sigma{}^0+{\rm c.c.}$ Open
Under the aegis of isospin conservation, the amplitudes in Born approximation, i.e., considering the only one-photon-exchange mechanism, of the decay $\psi\to \Lambda \overline \Sigma{}^0+{\rm c.c.}$, where $\psi$ is a vector charmonium, a…
View article: The cross section of $e^+e^- \to Λ\overline Σ^0+{\rm c.c.}$ as a litmus test of isospin violation in the decays of vector charmonia into $Λ\overline Σ^0+{\rm c.c.}$
The cross section of $e^+e^- \to Λ\overline Σ^0+{\rm c.c.}$ as a litmus test of isospin violation in the decays of vector charmonia into $Λ\overline Σ^0+{\rm c.c.}$ Open
Under the aegis of isospin conservation, the amplitudes in Born approximation, i.e., considering the only one-photon-exchange mechanism, of the decay $ψ\to Λ\overline Σ^0+{\rm c.c.}$, where $ψ$ is a vector charmonium, and of the reaction $…
View article: Helicity Amplitude Analysis of $\psi(3686) \to \Omega^- \bar{\Omega}^+$
Helicity Amplitude Analysis of $\psi(3686) \to \Omega^- \bar{\Omega}^+$ Open
We present an analysis of the process $\\psi(3686) \\to \\Omega^- \\bar{\\Omega}^+$ ($\\Omega^-\\to K^-\\Lambda$, $\\bar{\\Omega}^+\\to K^+\\bar{\\Lambda}$, $\\Lambda\\to p\\pi^-$, $\\bar{\\Lambda}\\to \\bar{p}\\pi^+$) based on a data set …
View article: Standalone codes for simulation and reconstruction of a triple-GEM: GTS and GRAAL
Standalone codes for simulation and reconstruction of a triple-GEM: GTS and GRAAL Open
The experiment BESIII, running at the accelerator BEPCII in Beijing (P.R.C.), is going to be updated with the replacement of the Inner Drift Chamber with a Cylindrical triple-GEM Inner Tracker (CGEM-IT). In the R&D stage, two standalone C+…
View article: A possible simultaneous fit to the available $e^+e^- \rightarrow \Lambda^+_c \bar{\Lambda}^-_c$ cross section data nearby $\psi(4660)$ by means of a strong correction to the Coulomb enhancement factor
A possible simultaneous fit to the available $e^+e^- \rightarrow \Lambda^+_c \bar{\Lambda}^-_c$ cross section data nearby $\psi(4660)$ by means of a strong correction to the Coulomb enhancement factor Open
There are two available set of data on the $e^+e^- \rightarrow \Lambda^+_c \bar{\Lambda}_c^-$ cross section above threshold. The BELLE measurement, with ISR return, is compatible with the presence of a resonant state, called $\psi(4660)$ (…
View article: A possible simultaneous fit to the available $e^+e^- \rightarrow Λ^+_c \barΛ^-_c$ cross section data nearby $ψ(4660)$ by means of a strong correction to the Coulomb enhancement factor
A possible simultaneous fit to the available $e^+e^- \rightarrow Λ^+_c \barΛ^-_c$ cross section data nearby $ψ(4660)$ by means of a strong correction to the Coulomb enhancement factor Open
There are two available set of data on the $e^+e^- \rightarrow Λ^+_c \barΛ_c^-$ cross section above threshold. The BELLE measurement, with ISR return, is compatible with the presence of a resonant state, called $ψ(4660)$ (formerly known as…
View article: PARSIFAL: a toolkit for triple-GEM parametrized simulation
PARSIFAL: a toolkit for triple-GEM parametrized simulation Open
PARSIFAL (PARametrized SImulation by Farinelli And Lavezzi) is a fast and reliable software tool that reproduces the complete response of a triple-GEM detector to the passage of a charged particle, taking into account the main physical eff…
View article: Measurement of the $e^+e^-\to\pi^+\pi^-\pi^0$ Cross Section from 0.7 GeV to 3.0 GeV via Initial-State Radiation
Measurement of the $e^+e^-\to\pi^+\pi^-\pi^0$ Cross Section from 0.7 GeV to 3.0 GeV via Initial-State Radiation Open
The cross section of the process $e^+e^-\to\pi^+\pi^-\pi^0$ is measured with a precision of 1.6% to 25% in the energy range between $0.7$ and 3.0 GeV using the Initial State Radiation method. A data set with an integrated luminosity of $2.…