1,670 research outputs found
Configurational Entropy can disentangle conventional hadrons from exotica
We evaluate the Configurational Entropy (CE) for scalar mesons and for
baryons in a holographic approach, varying the dimension of
boundary theory operators and using the soft-wall dual model of QCD. We find
that hybrid and multiquark mesons are characterized by an increasingly large
CE. A similar behavior is observed for baryons, where the
CE of pentaquarks is larger than for three-quark baryons, for same radial
number. Configurational Entropy seems relevant in disentangling conventional
hadrons from exotica.Comment: 13 pages, 4 figure
Unfolding spectral analysis of the Fermi-LAT data
The Large Area Telescope (LAT) onboard the Fermi satellite is observing the
gamma-ray sky in the high energy region, above 20 MeV. We have developed a
method to reconstruct the energy spectra of the gamma-rays detected by the
Fermi LAT instrument based on a Bayesian unfolding approach, that takes into
account the energy dispersion introduced by the instrument response. The method
has been successfully applied to reconstruct the energy spectra of both steady
and pulsating point sources. The analysis technique will be illustrated and the
results obtained in some significant test cases will be discussed.Comment: 6 pages, 9 figure
Cut-off Characterisation of Energy Spectra of Bright Fermi Sources: Current instrument limits and future possibilities
In this paper some of the brightest GeV sources observed by the Fermi-LAT
were analysed, focusing on their spectral cut-off region. The sources chosen
for this investigation were the brightest blazar flares of 3C~454.3 and 3C~279
and the Vela pulsar with a reanalysis with the latest Fermi-LAT software. For
the study of the spectral cut-off we first explored the Vela pulsar spectrum,
whose statistics in the time interval of the 3FGL catalog allowed strong
constraints to be obtained on the parameters. We subsequently performed a new
analysis of the flaring blazar SEDs. For these sources we obtained constraints
on the cut-off parameters under the assumption that their underlying spectral
distribution is described by a power-law with a stretched exponential cut-off.
We then highlighted the significant potential improvements on such constraints
by observations with next generation ground based Cherenkov telescopes,
represented in our study by the Cherenkov Telescope Array (CTA). Adopting
currently available simulations for this future observatory, we demonstrate the
considerable improvement in cut-off constraints achievable by observations with
this new instrument when compared with that achievable by satellite
observations.Comment: total number of pages 24, including 6 pages of references. Accepted
by Astroparticle Physic
Hadronic interactions of primary cosmic rays with the FLUKA code
The measured fluxes of secondary particles produced by the interactions of
cosmic rays with the astronomical environment represent a powerful tool to
infer some properties of primary cosmic rays. In this work we investigate the
production of secondary particles in inelastic hadronic interactions between
several cosmic rays species of projectiles and different target nuclei of the
interstellar medium. The yields of secondary particles have been calculated
with the FLUKA simulation package, that provides with very good accuracy the
energy distributions of secondary products in a large energy range. An
application to the propagation and production of secondaries in the Galaxy is
presented.Comment: 8 pages, 4 figures; Contribution to the 34th International Cosmic Ray
Conference, July 30 to August 6, The Hague, Netherlands; fixing a typo in the
y-axis label of Fig.
- …