Derivation of upward muon energy spectra in the TeV range produced by neutrinos from 3C273 AGN and diffuse atmospheric sources

The neutrino-induced upward muon energy spectrum on Earth at the TeV energy range emitted by the point source 3C273 AGN has been calculated using the AGN-emitted neutrino spectrum of Szabo and Protheroe and the result has been compared with that expected from background neutrinos. The QCD-based model of Berezinsky et al. has been fairly employed to estimate the muon contribution due to the charge current interactions in rock. The diffuse neutrino-induced upward muon energy spectrum from AGN sources has also been estimated and compared with the expected results from the spectra of prompt neutrinos and atmospheric backgrounds. It is found that the upward muon fluxes generated by AGN neutrinos are dominating the Universe beyond 10 TeV muon energy

Prinosi čestica, skaliranje antiprotona i prosječni poprečni impulsi u sudarima olovo–olovo na visokoj energiji: modelska studija

The study aims at explaining the behaviour of some of the very important observables measured in the latest lead-lead collisions at CERN in the light of a variety of the sequential chain model. Calculated values, to our surprise, are in excellent agreement with the measurements, especially when the effect of cascading and rescattering is empirically introduced in the calculations of the average transverse momenta. Implications of the results are discussed.Pokušavamo objasniti svojstva nekih vrlo važnih opservabli koje su u CERNu mjerili u najnovijim sudarima olovo–olovo i to na osnovi inačice modela lančastih nizova. Na naše iznenađenje, izračunate su vrijednosti u izvrsnom skladu s ishodima mjerenja, posebice kada se kaskade i višestruko raspršenje iskustveno uvedu u račun poprečnih impulsa. Raspravljaju se posljedice usporedbi

Mnogobrojna tvorba piona i kaona u visokoenergijskim sudarima jezgra-jezgra: ishodi mjerenja i posebni modeli

The pion and kaon rapidity densities and the nature of kaon-pion ratios offer two very prominent and crucial physical observables on which modestly sufficient data for heavy nucleus collisions are available to date. In the light of two sets of models - one purely phenomenological and the other with a modest degree of a dynamical basis - we try to examine the state of agreement between calculations and experimental results obtainable from the past and the latest measurements. Impact and implications of all these would also finally be spelt out.Gustoće rapidnosti piona i kaona i narav omjera kaona i piona pružaju dvije vrlo važne fizičke opservable za koje su dosada postignuti brojni podaci mjerenjem sudara teških jezgri. Ispitujemo skladnost teorije polazeći od dva skupa modela, jednog potpuno fenomenološkog i drugog s umjerenim stupnjem dinamike, i eksperimentalnih podataka poznatih iz ranijih i nedavnih mjerenja. Raspravlja se njihova važnost i sljedbe

Prinosi čestica, skaliranje antiprotona i prosječni poprečni impulsi u sudarima olovo–olovo na visokoj energiji: modelska studija

The study aims at explaining the behaviour of some of the very important observables measured in the latest lead-lead collisions at CERN in the light of a variety of the sequential chain model. Calculated values, to our surprise, are in excellent agreement with the measurements, especially when the effect of cascading and rescattering is empirically introduced in the calculations of the average transverse momenta. Implications of the results are discussed.Pokušavamo objasniti svojstva nekih vrlo važnih opservabli koje su u CERNu mjerili u najnovijim sudarima olovo–olovo i to na osnovi inačice modela lančastih nizova. Na naše iznenađenje, izračunate su vrijednosti u izvrsnom skladu s ishodima mjerenja, posebice kada se kaskade i višestruko raspršenje iskustveno uvedu u račun poprečnih impulsa. Raspravljaju se posljedice usporedbi

Proximity-induced supercurrent through topological insulator based nanowires for quantum computation studies

Proximity induced superconducting energy gap in the surface states of topological insulators has been predicted to host the much wanted Majorana fermions for fault tolerant quantum computation. Recent theoretically proposed architectures for topological quantum computation via Majoranas are based on large networks of Kitaevs one dimensional quantum wires, which pose a huge experimental challenge in terms of scalability of the current single nanowire based devices. Here, we address this problem by realizing robust superconductivity in junctions of fabricated topological insulator Bi2Se3 nanowires proximity coupled to conventional s wave superconducting W electrodes. Milling technique possesses great potential in fabrication of any desired shapes and structures at nanoscale level, and therefore can be effectively utilized to scale up the existing single nanowire based design into nanowire based network architectures. We demonstrate the dominant role of ballistic topological surface states in propagating the long range proximity induced superconducting order with high IcRN product in long Bi2Se3 junctions. Large upper critical magnetic fields exceeding the Chandrasekhar Clogston limit suggests the existence of robust superconducting order with spin triplet cooper pairing. An unconventional inverse dependence of IcRN product on the width of the nanowire junction was also observed.Comment: 12 page