1,721,589 research outputs found
Absolute determination of D(s) branching ratios and f(D(s)) extraction at a neutrino factory
No full textAcoustic neutrino detection in a Adriatic multidisciplinary observatory (ANDIAMO)
Full text linkThe existence of cosmic accelerators able to emit charged particles up to ZeV energies has been confirmed by the observations made in the last years by experiments such as Auger and Telescope Array. The interaction of such energetic cosmic-rays with gas or low energy photons, surrounding the astrophysical sources or present in the intergalactic medium, guarantee an ultra-high-energy neutrino related emission. When these energetic neutrinos interact in a medium produce a thermo-acoustic process where the energy of generated particle cascades can be conveyed in a pressure pulse propagating into the same medium. The kilometric attenuation length as well as the well-defined shape of the expected pulse suggest a large-area-undersea-array of acoustic sensors as an ideal observatory. For this scope, we propose to exploit the existing and no more operative offshore (oil rigs) powered platforms in the Adriatic sea as the main infrastructure to build an acoustic submarine array of dedicated hydrophones covering a surface area up to 10000 km2 and a volume up to 500 km3. In this work we describe the advantages of this detector concept using a ray tracing technique as well as the scientific goals linked to the challenging purpose of observing for the first time ultra-high-energy cosmic neutrinos. This observatory will be complementary to the dedicated radio array detectors with the advantages of avoiding any possible thermo-acoustic noise from the atmospheric muons
Absolute determination of branching ratios and extraction at a neutrino factory
No full textA novel method for a direct measurement of the exclusive branching ratios and of the decay constant with a systematical error better than is presented. The approach is based on the peculiar vertex topology of the anti-neutrino induced diffractive charm events. The statistical accuracy achievable with a neutrino factory is estimated.A method for a direct measurement of the exclusive D_s branching ratios and of the decay constant f_{D_s} with a systematical error better than 5% is presented. The approach is based on the peculiar vertex topology of the anti-neutrino induced diffractive charm events. The statistical accuracy achievable with a neutrino factory is estimated.A method for a direct measurement of the exclusive D s branching ratios and of the decay constant f D s with a systematical error better than 5% is presented. The approach is based on the peculiar vertex topology of the anti-neutrino induced diffractive charm events. The statistical accuracy achievable with a neutrino factory is estimated
The ReCaS Infrastructure for the Neutrino Astronomy with KM3NeT
No full textThe goals and principles of the KM3NeT project are presented. The large needs in terms of computing power are met thanks to the sizable contribution of the Rete di Calcolo per SuperB e altre (ReCaS) infrastructure hosted at the University of Naples. The KM3NeT computing model is reviewed and details are shown of how it is implemented and supported by means of ReCaS facilities and technologies
Prediction of charm production fractions in neutrino interactions
No full textThe way a charm-quark fragments into a charmed hadron is a challenging problem both for the theoretical and the experimental particle physics. Moreover, in neutrino induced charm-production, peculiar processes occur such as quasi-elastic and diffractive charm-production which make the results from other experiments not directly comparable. We present here a method to extract the charmed fractions in neutrino induced events by using results from e+e-, πN, γN experiments while taking into account the peculiarities of charm-production in neutrino interactions. As results, we predict the fragmentation functions as a function of the neutrino energy and the semi-muonic branching ratio, Bμ, and compare them with the available data
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