Física Quàntica i Astrofísica: Recent submissions
Now showing items 1-20 of 2993
Solar neutrinos and leptonic spin forces
We quantify the efects of light spin-zero particles with pseudoscalar couplings to leptons and scalar couplings to nucleons on the evolution of solar neutrinos. In this scenario the matter potential sourced by the nucleons ...
Measurement of CP asymmetries and branching fraction ratios of B− decays to two charm mesons
The CP asymmetries of seven B− decays to two charm mesons are measured using data corresponding to an integrated luminosity of 9 fb−1 of proton-proton collisions collected by the LHCb experiment. Decays involving a D∗0 or ...
Measurement of CP asymmetries and branching fraction ratios of B− decays to two charm mesons
The CP asymmetries of seven B− decays to two charm mesons are measured using data corresponding to an integrated luminosity of 9 fb−1 of proton-proton collisions collected by the LHCb experiment. Decays involving a D∗0 or ...
Axion-induced pair production: A new strategy for axion detection
We revisit and update the axion-induced pair production process in a nuclear electric field mediated by the axion-electron coupling, a þ A ZX → A ZX þ eþ þ e−. This process emerges as one of the most efficient channels for ...
Multiwavelength study of the gravitationally lensed blazar QSO B0218+357 between 2016 and 2020
We report multiwavelength observations of the gravitationally lensed blazar QSO B0218+357 in 2016–2020. Optical, X-ray, and GeV flares were detected. The contemporaneous MAGIC observations do not show significant very high ...
Multiwavelength study of the gravitationally lensed blazar QSO B0218+357 between 2016 and 2020
We report multiwavelength observations of the gravitationally lensed blazar QSO B0218+357 in 2016–2020. Optical, X-ray, and GeV flares were detected. The contemporaneous MAGIC observations do not show significant very high ...
Heavily obscured AGN detection: A radio versus X-ray challenge
Context. In the supermassive black hole (SMBH)-galaxy coevolution scenario, heavily obscured active galactic nuclei (AGN) represent a fundamental phase of SMBH growth during which most of the BH mass is accreted and the ...
Quantized vortex nucleation in collisions of superfluid nanoscopic helium droplets at zero termperature
We address the collision of two superfluid 4He droplets at non-zero initial relative velocities and impact parameters within the framework of liquid 4He time-dependent density functional theory at zero temperature. Despite ...
Nanoscopic jets and filaments of superfluid He-4 at zero temperature: a DFT study
The instability of a cryogenic 4He jet exiting through a small nozzle into vacuum leads to the formation of 4He drops, which are considered ideal matrices for spectroscopic studies of embedded atoms and molecules. Here, ...
Clustering, collision, and relaxation dynamics in pure and doped helium nanoclusters: Density- vs particle-based approaches
The clustering, collision, and relaxation dynamics of pristine and doped helium nanodroplets is theoretically investigated in cases of pickup and clustering of heliophilic argon, collision of heliophobic cesium atoms, and ...
Application of a Neural Network classifier for the generation of clean Small Magellanic Cloud stellar samples
Context. Previous attempts to separate Small Magellanic Cloud (SMC) stars from the Milky Way (MW) foreground stars are based only on the proper motions of the stars. Aims. In this paper, we aim to develop a statistical ...
Perturbed nuclear matter studied within density functional theory with a finite number of particles
Nuclear matter is studied within the density functional theory framework. Our method employs a finite number of nucleons in a box subject to periodic boundary conditions, in order to simulate infinite matter and study its ...
GNSS Solar Astronomy in real-time during more than one solar cycle
This work presents a summary of the continuous non-stop (hereinafter 24/7) real-time measurement and warning system for EUV solar activity, which is based on worldwide multifrequency Global Navigation Satellite Systems ...
Finite-range simple effective interaction including tensor terms
An existing parametrization of the simple effective interaction (SEI) that is able to reproduce the experimentally known crossing between the 2𝑝3/2 and 1𝑓5/2 single-particle (s.p.) proton levels in neutron-rich Ni ...
Erratum: Gaia Data Release 2: The kinematics of globular clusters and dwarf galaxies around the Milky Way
Aims. The goal of this paper is to demonstrate the outstanding quality of the second data release of the Gaia mission and its power for constraining many different aspects of the dynamics of the satellites of the Milky ...
Probing the non-thermal physics of stellar bow shocks using radio observations<br />
Context. Massive runaway stars produce bow shocks in the interstellar medium. Recent observations revealed radio emission from a few of these objects, but the origin of this radiation remains poorly understood. Aims. ...
Measurement of the mass difference and relative production rate of the Ωb- and Ξb- baryons
The mass difference between the Ω− b and Ξ− b baryons is measured using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1, and is found to be mðΩ− b Þ − mðΞ− ...
Measurement of CP observables in B± → D(*)K± and B± → D(*) π ± decays using two-body D final states
Measurements of CP observables in B± → D(∗)K± and B± → D(∗)π ± decays are presented, where D(∗) indicates a neutral D or D∗ meson that is an admixture of meson and anti-meson states. Decays of the D(∗) meson to the Dπ0 and ...
Evidence for the two-body charmless baryonic decay {B}+\to p\overline{Λ}
A search for the rare two-body charmless baryonic decay {B}+\to p\overline{Λ} is performed with pp collision data, corresponding to an integrated luminosity of 3 fb-1, collected by the LHCb experiment at centre-of-mass ...
Bayesian image reconstruction with space-variant noise suppression
In this paper we present a Bayesian image reconstruction algorithm with entropy prior (FMAPE) that uses a space-variant hyperparameter. The spatial variation of the hyperparameter allows different degrees of resolution in ...
