Results 1 - 10 of 1514
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[en] Recent measurements of meson production in proton-nucleus interactions have made possible reliable neutrino flux determinations at modern neutrino experiments. This article discusses preliminary results from the HARP, MIP, and E910 are discussed along with some of their implications for the MINOS, K2K, and MiniBooNE neutrino experiments.
[en] In the experiments on the SPHINKS facility using the 70 GeV proton beam of the IHEP accelerator, a broad program of study of the baryon diffractive production and the search for exotic baryons in these processes is carried out
[en] New empirical formulae for in-medium nucleon-nucleon cross-section are presented and used to study the proton-nucleus interaction in the framework of Glauber model. The total, absorption and elastic cross-sections are calculated for many target nuclei. The calculated total cross-sections using the in-medium effective factor, give a reasonable fit with the experimental data. In addition, the in-medium factors and successfully reproduce the absorption cross-section at energies up to 600 MeV.
[en] The relativistic description of the proton-nucleus elastic scattering can be considered within the framework of a relativistic optical potential model. The elastic scattering of proton with the nuclei 12C, 16O, 20Ne, and 24Mg at 800 MeV and 1.04 GeV are studied for relativistic and nonrelativistic treatments. The real optical potentials and the differential cross sections of these reactions are calculated. The obtained results are compared with the corresponding results obtained from the calculation depending on the Woods–Saxon optical potential which were adjusted to fit the experimental data. The present results are in good agreement with the experimental data. (author)
[en] We argue that high-multiplicity events in proton–proton or proton–nucleus collisions originate from large-size fluctuations of the nucleon shape. We discuss a pair of simple models of such proton shape fluctuations. A “fat” proton with a size of 3 fm occurs with observable frequency. In light of this result, collective flow behavior in the ensuing nuclear interaction seems feasible. We discuss the influence of these models on the parton structure of the proton
[en] The results of a comparative analysis of channels involving the inclusive production of deuterons and tritons in 16Op collisions at a projectile momentum of 3.25 GeV/c per nucleon are presented. The mechanisms governing proton, deuteron, and triton production in the fragmentation of oxygen nuclei are found to be independent. It is shown that the observed proton-multiplicity correlations are associated predominantly with the character of the primary event of a proton-nucleon collision in 16Op interactions. It is found that, in reactions involving triton production, the contributions of processes leading to an increase in the mean proton multiplicity (n → p + π− and np → pn) and processes leading to its decrease (p → n + π+) compensate each other
[en] The dilution effect appearing in the search for CP violation in the B0d, bar B0d decay is discussed. The authors considers pN collisions at large c.m. energy (LHC and SSC projects). A measurement of the dilution parameter is proposed by considering B+-, B0d, bar B0d decaying into channels where CP violation is not present
[en] We study systematically the kaon pseudorapidity distribution in proton-nucleus and nucleus-nucleus collisions at AGS and SPS energies within the cylinder model. The calculated results are compared and shown to be in agreement with the available experimental data. (author)
[en] The existing measurements of quarkonium polarization in proton-antiproton and proton-nucleus collisions are puzzling. We highlight issues which are often underestimated in the experimental analyses: the importance of the choice of the experimental acceptance on the comparison between experimental measurements and theoretical calculations. New measurements must provide more detailed information, such that physical conclusions can be derived without relying on model-dependent assumptions. We also describe a frame-invariant formalism which minimizes the dependence of the measurements on the experimental acceptance, facilitates the comparison with theoretical calculations, and probes systematic effects due to experimental biases.
[en] Recently, Esry and Sadeghpour (2003), and Hesse, Le and Lin (2004), have reported calculations of protonium formation in p-bar+ H collisions at low energies, using hyperspherical coordinates in a hyperradial adiabatic approach. In order to make the problem tractable both groups were forced to introduce an artificial proton mass (mp' = 17.824 a.u. and mp' = 100 a.u., respectively) which raises doubts as to the physical relevance of their results and conclusions. Here we make use of the hyperspheroidal coordinates in order to attack the same problem in basically the same approach but without need for changing the physical particle masses