3,262 research outputs found
Double Parton Scattering, Multi-Parton Interactions, underlying event and identified hadrons: summary of recent results
Recent results related to Double-Parton Scattering (DPS) and Multi-Parton
Interactions (MPI) from the LHC experiments (ALICE, ATLAS, CMS and LHCb) are
reviewed and discussed together with a brief overview of relevant literature.
The robust evidence collected for DPS in different channels at LHC energies is
complemented by an increasing understanding of our description of MPI in high
energy collisions and the corresponding modelling of the underlying event (UE)
in hadronic interactions. Potential new results expected during Run 2 at the
LHC are also anticipated.
The relation and the interplay between the relevant observables for DPS, MPI
and UE analyses are discussed presenting recent attempts to bring together
their description in a single Monte Carlo tune. Identified hadron spectra at
the LHC have been now measured by all collaborations and results are reviewed
with an emphasis on strangeness production and baryon/meson ratio. The data
collected during Run 1 at the LHC with different collision systems (pp, p-Pb,
Pb-Pb) show that several particle production features appear to be more
correlated with the event multiplicity than the collision system itself.Comment: 7 pages, no figures, LHCP2014 conference proceeding
Estimations of the Distances of Stellar Collapses in the Galaxy by Analyzing the Energy Spectrum of Neutrino Bursts
The neutrino telescopes of the present generation, depending on their
specific features, can reconstruct the neutrino spectra from a galactic burst.
Since the optical counterpart could be not available, it is desirable to have
at hand alternative methods to estimate the distance of the supernova explosion
using only the neutrino data. In this work we present preliminary results on
the method we are proposing to estimate the distance from a galactic supernova
based only on the spectral shape of the neutrino burst and assumptions on the
gravitational binding energy released an a typical supernova explosion due to
stellar collapses.Comment: Proceedings of the Second International Symposium on Strong
Electromagnetic Fields and Neutron Stars (SMFNS 2011) Instituto de
Cibern\'etica, Matem\'atica y F\'isica (ICIMAF) Sociedad Cubana de F\'isica
(SCF) Varadero, Cuba, 5-7 May 201
A parameterisation of single and multiple muons in the deep water or ice
A new parameterisation of atmospheric muons deep underwater (or ice) is
presented. It takes into account the simultaneous arrival of muons in bundle
giving the multiplicity of the events and the muon energy spectrum as a
function of their lateral distribution in a shower.Comment: 3 pages, 2 figures, talk given at TAUP 2005, Zaragoza (Spain) (to
appear in the proceedings of TAUP 2005
On the angular distribution of extensive air showers
Angular distributions of extensive air showers with different number of
charged particles in the range 2.5x10^5--4x10^7 are derived using the
experimental data obtained with the EAS MSU array. Possible approximations of
the obtained distributions with different empiric functions available in
literature, are analysed. It is shown that the exponential function provides
the best approximation of the angular distributions in the sense of the
chi-squared criterion.Comment: 5 pages including 1 figur
The SuperNova Early Warning System
A core collapse in the Milky Way will produce an enormous burst of neutrinos
in detectors world-wide. Such a burst has the potential to provide an early
warning of a supernova's appearance. I will describe the nature of the signal,
the sensitivity of current detectors, and SNEWS, the SuperNova Early Warning
System, a network designed to alert astronomers as soon as possible after the
detected neutrino signal.Comment: 3 pages, appearing in refereed proceedings of "Hotwiring the
Transient Universe 2007", eds. A. Allan, J. S. Bloom, R. Seaman, Astron.
Nachr. vol. 329, March 200
IMPLICATION FOR THE CORE-COLLAPSE SUPERNOVA RATE FROM 21 YEARS OF DATA OF THE LARGE VOLUME DETECTOR
The Large Volume Detector (LVD) has been continuously taking data since 1992 at the INFN Gran Sasso National Laboratory. The LVD is sensitive to neutrino bursts from gravitational stellar collapses with full detection probability over the Galaxy. We have searched for neutrino bursts in LVD data taken over 7,335 days of operation. No evidence of neutrino signals has been found between 1992 June and 2013 December. The 90% C.L. upper limit on the rate of core collapse and failed supernova explosions out to distances of 25 kpc is found to be 0.114 yr[superscript −1]
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