1,343 research outputs found
IceCube-Gen2: A Vision for the Future of Neutrino Astronomy in Antarctica
No full text20 pages, 12 figures. Address correspondence to: E. Blaufuss, F. Halzen, C. Kopper (Changed to add one missing author, no other changes from initial version.)20 pages, 12 figures. Address correspondence to: E. Blaufuss, F. Halzen, C. Kopper (Changed to add one missing author, no other changes from initial version.)20 pages, 12 figures. Address correspondence to: E. Blaufuss, F. Halzen, C. Kopper (Changed to add one missing author, no other changes from initial version.)The recent observation by the IceCube neutrino observatory of an astrophysical flux of neutrinos represents the "first light" in the nascent field of neutrino astronomy. The observed diffuse neutrino flux seems to suggest a much larger level of hadronic activity in the non-thermal universe than previously thought and suggests a rich discovery potential for a larger neutrino observatory. This document presents a vision for an substantial expansion of the current IceCube detector, IceCube-Gen2, including the aim of instrumenting a volume of clear glacial ice at the South Pole to deliver substantial increases in the astrophysical neutrino sample for all flavors. A detector of this size would have a rich physics program with the goal to resolve the sources of these astrophysical neutrinos, discover GZK neutrinos, and be a leading observatory in future multi-messenger astronomy programs
Composition Of Primary Cosmic Rays Beyond The "knee" From Emulsion Chamber Observations
No full textWe show that the simplest assumptions for the dynamics of particle production allow us to understand the fluxes of hadrons and photons at mountain altitudes as well as the structure of individual events. The analysis requires a heavy nuclear component of primary cosmic rays above the "knee" in the spectrum with an average mass number (A)=7.3±0.9.54955585562Shibata, T., (1995) Rapporteur Talk Presented at the 24th International Cosmic Ray Conference, , Rome, Italy, University of Tokyo ICRR Report No. 343-95-9 (unpublished)Gaisser, T.K., (1992) Cosmic Rays and Particle Physics, , Cambridge University Press, Cambridge, EnglandCosta, C.G.S., Halzen, F., Salles, C., (1995) Phys. Rev. D, 52, p. 3890Lattes, C.M.G., Fujimoto, Y., Hasegawa, S., (1980) Phys. Rep., 65, p. 151Chinellato, J.A., (1981), Ph.D. thesis, Universidade Estadual de Campinas, BrazilChinellato, J.A., (1990) Proceedings of the 21st International Cosmic Ray Conference, 8, p. 259. , Adelaide, Australia, edited by R. J. Protheroe Graphic Services, Northfield, AustraliaKopenkin, V.V., Fujimoto, Y., private communicationBellandi, J., (1991) Nuovo Cimento C, 14, p. 15Navia, C.E., (1989) Phys. Rev. D, 40, p. 2898Nishimura, J., (1967) Handbuch der Physik, 62 (2 PART), p. 1. , edited by K. Sitte Springer, BerlinBellandi Fo, J., (1992) J. Phys. A, 25, p. 877Fletcher, R.S., Gaisser, T.K., Lipari, P., Stanev, T., (1994) Phys. Rev. D, 50, p. 5710Hara, T., (1983) Proceedings of the 18th International Cosmic Ray Conference, 9, p. 198. , Bangalore, India, 1983, edited by N. Durgaprasad et al. CTIFR, BombayNagano, M., (1984) J. Phys. G, 10, p. 1295Asakimori, K., (1994) Proceedings of the 7th International Symposium on Very High Energy Cosmic Ray Interactions, p. 513. , Tokyo, Japan, edited by Y. Fujimoto et al. TokyoRen, J.R., (1988) Phys. Rev. D, 38, p. 1404Biermann, P.L., Gaisser, T.K., Stanev, T., (1995) Phys. Rev. D, 51, p. 3450(1995) Proceedings of the 24th International Cosmic Ray Conference, 2, p. 710. , Rome, Italy INFN, RomeShibata, M., (1981) Phys. Rev. D, 24, p. 1847Wdowczyk, J., (1994) J. Phys. G, 20, p. 1001Lattes, C.M.G., (1971) Prog. Theor. Phys. Suppl., 47, p. 1(1973) Proceedings of the 13th International Cosmic Ray Conference, 3, p. 2219. , Denver, Colorado Colorado Associated University Press, BoulderAkashi, M., (1981) Nuovo Cimento A, 65, p. 355Ren, J.R., (1987) Nuovo Cimento C, 10, p. 43Burnett, T.H., (1984) Proceedings of the International Symposium on Cosmic Ray and Particle Physics, p. 468. , Tokyo, Japan, edited by A. Ohsawa and T. Yuda Yamada, TokyoWiebel-Sooth, B., Biermann, P.L., Meyer, H., (1995) Proceedings of the 24th International Cosmic Ray Conference, 2, p. 656. , Rome, Italy INFN, Rome(1995) Proceedings of the 24th International Cosmic Ray Conference, 2, p. 689. , Rome, Italy INFN, RomeYuda, T., (1991) Rapporteur Talk Presented at the 22nd International Cosmic Ray Conference, 5, p. 313. , Dublin, IrelandHalzen, F., (1993) AIP Conf. Proc. No. 276, p. 679. , Proceedings of the Seventh International Symposium on Very High Energy Cosmic Ray Interactions, Ann Arbor, Michigan, edited by L. Jones, AIP, New Yor
ARENA 2005, Acoustic and Radio EeV Neutrino Detection Activities
No full textThe ARENA Workshop in Zeuthen was the first to combine extensively the fields of acoustic and radio detection techniques for high-energetic particle cascades from cosmic neutrino interactions. The contribution to the Workshop comprise the latest research work which was presented by over 50 speakers from 10 countries. The wide coverage includes: theoretical predictions on fluxes and the potentialities of new techniques, theoretical and experimental results on target material properties, the fundamentals of interactions and cascade simulation, and current experimental results and the most recent neutrino flux limits. The Workshop also discussed future plans and experiments for both radio and acoustic methods with the aim of giving up-to-date overview of this rapidly developing field
The parton momentum distributions of the nucleon and A(_QCD)
No full textNext-to-leading order QCD fits are performed to F(_2)(^up), F(_2)(^un)/F(_2)(^up), F(_2)(^uFe) and xF(_3)(^vFe) deep-inelastic scattering data using the F^^ data of either the EMC or BCDMS collaborations, appropriately renormalized for consistency with the re- analysed SLAC F(_2)(^ep) data. The parton distributions from these fits are then used to predict next-to- leading order prompt photon production cross-sections. The variation in the quality of the overall description of the deep-inelastic scattering and prompt photon production data simultaneously determines A(_MS) and the form of the gluon distribution of the proton. Next, cross-sections are predicted at next-to-leading order for the Drell-Yan process. Here, the quality of the overall description determines the antiquark content of the proton. Two sets of parton distributions are presented according to whether the EMC or BCDMS F(_2)(^up) data were used in the analysis. Possible alternatives for the low-x behaviour of the gluon distribution - outside the range of the fitted data - are discussed and predictions are made for future experiments which have the potential to distinguish between these alternatives
The highest energy neutrinos: First evidence for cosmic origin
No full textDevelopments in neutrino astronomy have been to a great extent motivated by the search for the sources of the cosmic rays, leading at a very early stage to the concept of a cubic kilometer neutrino detector. Almost four decades
later such an instrument, IceCube, is taking data and has produced the first evidence for a flux of high-energy neutrinos of cosmic origin. After a brief review of the
history of the field, we will introduce IceCube and describe the first analysis of data taken with the completed instrument. The atmospheric neutrino flux cannot
accommodate an excess of 28 neutrinos observed with energies above 60 TeV. We will briefly speculate on the origin of these events. Readers interested specifically in
IceCube results may refer directly to section 3
PRODUCTION OF HEAVY QUARKS
No full text1. Vue d'ensemble du sujet. 2. Annihilation e+e- et production par neutrinos. 3. Production par photons et leptons. 4. Production par hadrons. 5. Problèmes pour le modèle standard. 6. Conclusions.1. Introduction : a perspective on the subject. 2. e+e- annihilation and leptoproduction by neutrinos. 3. Photo- and leptoproduction. 4. Hadroproduction. 5. Problems for the standard model. 6. Conclusions
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Theoretical interpretation of experiments with polarized proton beams
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