Física Quàntica i Astrofísica: Recent submissions
Now showing items 41-60 of 2993
Measurement of the effective B0s→K+K− lifetime
A precise determination of the effective B0 s → K + K − lifetime can be used to constrain contributions from physics beyond the Standard Model in the B0 s meson system. Conventional approaches select B meson decay products ...
Detection of superimposed periodic signals using wavelets
In this paper we present a wavelet based algorithm that is able to detect superimposed periodic signals in data with low signal-noise ratio. In this context, the results given by classical period determination methods ...
Photometric Bgr survey of the distant clusters of galaxies CL 1613+3104 and CL 1600+4109
We present a set of photometric data concerning two distant clusters of galaxies: Cl 1613+3104 (z=0.415) and Cl 1600+4109 (z=0.540). The photometric survey extends to a field of about 4' x 3'. It was performed in 3 filters: ...
Slow dynamis in the 3D gonihedric model
We provide analytical evidence of stochastic resonance in polarization switching vertical-cavity surface-emitting lasers (VCSELs). We describe the VCSEL by a two-mode stochastic rate equation model and apply a multiple ...
Multipole response of metal spheres to q-dependent excitation operators
We have obtained the once and thrice energy-weighted moments of the random-phase-approximation (RPA) response to q-dependent excitation operators of type j L (qr) Y L 0 for metal spheres described within a spherical ...
J-PLUS: The Javalambre Photometric Local Universe Survey
The Javalambre Photometric Local Universe Survey (J-PLUS ) is an ongoing 12-band photometric optical survey, observing thousands of square degrees of the Northern Hemisphere from the dedicated JAST/T80 telescope at the ...
Observation of New Charmonium or Charmoniumlike States in B+ →D∗±D∓K+ Decays
A study of resonant structures in Bþ → DþD−Kþ and Bþ → D−DþKþ decays is performed, using proton-proton collision data at center-of-mass energies of ffiffi s p ¼ 7, 8, and 13 TeV recorded by the LHCb experiment, corresponding ...
Collective and single-particle excitations of a trapped Bose gas
The density of states of a Bose-condensed gas confined in a harmonic trap is investigated. The predictions of Bogoliubov theory are compared with those of Hartree-Fock theory and of the hydrodynamic model. We show that the ...
Study of ¯¯B → Xuℓ¯ν decays in B¯¯B events tagged by a fully reconstructed B-meson decay and determination of |Vub|
We report measurements of partial branching fractions for inclusive charmless semileptonic B decays ¯¯¯ B → X u ℓ ¯ ν and the determination of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element | V u b | . The analysis is ...
Role of the rho meson in the nonmesonic hypernuclear decay
The ρ -meson contribution to the Λ N → NN process is studied in the nonmesonic decay of hypernuclei. It is found that the central potential of the ρ exchange is larger than its tensor part and, therefore, ...
Suzaku and Multi-Wavelength Observations of OJ 287 during the Periodic Optical Outburst in 2007
Suzaku observations of the blazar OJ 287 were performed in 2007 April 10-13 and November 7-9. They correspond to a quiescent and a flaring state, respectively. The X-ray spectra of the source can be well-described with ...
Measurements of the decays B0 → ¯D0p¯p, B0 → ¯D*0p¯p, B0 → D−p¯pπ+, and B0 → D*−p¯p+
We present measurements of branching fractions of B 0 decays to multibody final states containing protons, based on 232 × 10 6 Υ ( 4 S ) → B ¯¯¯ B decays collected with the BABAR detector at the SLAC PEP-II asymmetric-energy ...
On the interplay between Q^2 and t dependence in exclusive diffractive production of real photons and vector mesons in ep collisions
We show how the familiar phenomenological way of combining the Q2 (photon virtuality) and t (squared momentum transfer) dependences of the scattering amplitude in Deeply Virtual Compton Scattering (DVCS) [1, 2] and Vector ...
Observation of inclusive D*+- production in the decay of Upsilon (1S)
Bound states of heavy quarks provide a powerful testing ground for quantum chromodynamics (QCD). Experimental studies of charmonium and bottomonium spectroscopy have helped uncover some of the key aspects of the quarkonium ...
Nonparabolicity and dielectric effects on addition energy spectra of spherical nanocrystals
An extension of the spin density functional theory simultaneously accounting for dielectric mismatch between neighboring materials and nonparabolicity corrections originating from interactions between conduction and valence ...
Search for the decay B0 → K0SK0SK0L
We present the first search for the decay B 0 → K 0 S K 0 S K 0 L using a data sample of 232 × 10 6 B ¯¯¯ B pairs. We find no statistically significant evidence for the nonresonant component of this decay. Our central value ...
Nonmesonic weak decay of the hypertriton
The nonmesonic decay of the hypertriton is calculated based on a hypertriton wave function and 3N scattering states, which are rigorous solutions of three-body Faddeev equations using realistic NN and hyperon-nucleon ...
Theoretical study of elastic electron scattering off stable and exotic nuclei
Results for elastic electron scattering by nuclei, calculated with charge densities of Skyrme forces and covariant effective Lagrangians that accurately describe nuclear ground states, are compared against experiment in ...
First characterization of the emission behavior of Mrk 421 from radio to very high-energy gamma rays with simultaneous X-ray polarization measurements
Aims: We have performed the first broadband study of Mrk 421 from radio to TeV gamma rays with simultaneous measurements of the X-ray polarization from IXPE. </p><p>Methods: The data were collected as part of an extensive ...
Search for B→K∗ν¯ν decays
We present a search for the decays B → K ∗ ν ¯ ν using 454 × 10 6 B ¯¯¯ B pairs collected at the Υ ( 4 S ) resonance with the BABAR detector at the SLAC PEP-II B -Factory. We first select an event sample where one B is ...
