Markers and neutral current lled triangles

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Unformatted text preview: elf. The conventional PDF makes use of the Dokshitzer-GribovLipatov-Altarelli-Parisi formalism (Altarelli and Parisi, 1977; Dokshitzer, 1977), which is a next-to-leading order Joseph A. Formaggio and G. P. Zeller: From eV to EeV: Neutrino cross sections . . . QCD calculation. As one pushes further down in x, the PDFs introduce greater uncertainties, whereby other approaches can be used, such as the formalism adopted by the Balitsky-Fadin-Kuraev-Lipatov group (Kuraev, Lipatov, and Fadin, 1977; Ciafaloni et al., 2006). In reality, the approaches of both Dokshitzer-Gribov-Lipatov-Altarelli-Parisi and Balitsky-Fadin-Kuraev-Lipatov need to be combined in order to properly account for the Q2 and x evolution of these PDFs. One of the more difficult effects to account for in these parametrization schemes is that of gluon recombination (gg ! g). Such a saturation must take place at the very highest energies in order to preserve unitarity. Groups have made use of nonlinear color glass condensate models as a way to model these effects (Iancu and Venugopalan, 2003). Such techniques have been successfully applied to Relativistic Heavy Ion Collider (RHIC) data (Jalilian-Marian and Kovchegov, 2006). VIII. SUMMARY In this work, we presented a comprehensive review of neutrino interaction cross sections. Our discussion ranged from eV to EeV energy scales and therefore spanned a broad range of underlying physics processes, theoretical calculations, and experimental measurements. While our knowledge of neutrino scattering may not be equally precise at all energies, one cannot help but marvel at how far our theoretical frameworks extend. From literally zero-point energy to unfathomable reaches, it appears that our models can shed some light in the darkness. Equally remarkable is the effort by which we seek to ground our theories. Where data do not exist, we seek other anchors by which we can assess their validity. When even that approach fails, we pile model against model in the hopes of finding weaknesses that ultimately will strengthen our foundations. As the journey continues into the current millennium, we find that more and more direct data are being collected to guide our theoretical understanding. Currently, new experiments are coming online to shed more light on neutrino interactions. Therefore, we believe that, as comprehensive as we have tried to make this review, it is certainly an incomplete story whose chapters continue to be written. ACKNOWLEDGMENTS The authors thank S. Brice, S. Dytman, D. Naples, J. P. Krane, G. Mention, and R. Tayloe for help in gathering experimental data used in this review. The authors also thank W. Haxton, W. Donnelly, and R. G. H. Robertson for their comments and suggestions pertaining to this work. J. A. Formaggio is supported by the United States Department of Energy under Grant No. DE-FG02-06ER-41420. G. P. Zeller is supported via the Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Dep...
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This document was uploaded on 09/28/2013.

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