Particle theory

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High-energy neutrinos from astrophysical accelerators of cosmic ray nuclei

(2007)

Authors:

Luis A Anchordoqui, Dan Hooper, Subir Sarkar, Andrew M Taylor
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Heterotic Compactification, An Algorithmic Approach

(2007)

Authors:

Lara B Anderson, Yang-Hui He, Andre Lukas
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A precise calculation of the fundamental string tension in SU (N) gauge theories in 2 + 1 dimensions

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 645:4 (2007) 383-388

Authors:

B Bringoltz, M Teper

Abstract:

We use lattice techniques to calculate the continuum string tensions of SU (N) gauge theories in 2 + 1 dimensions. We attempt to control all systematic errors at a level that allows us to perform a precise test of the analytic prediction of Karabali, Kim and Nair. We find that their prediction is within 3% of our values for all N and that the discrepancy decreases with increasing N. When we extrapolate our results to N = ∞ we find that there remains a discrepancy of ≃ 1 %, which is a convincing ∼ 6 σ effect. Thus, while the Karabali-Nair analysis is remarkably accurate at N = ∞, it is not exact. © 2006 Elsevier B.V. All rights reserved.
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Perturbative Anti-Brane Potentials in Heterotic M-theory

(2007)

Authors:

James Gray, Andre Lukas, Burt Ovrut
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Anisotropy studies around the galactic centre at EeV energies with the Auger Observatory

Astroparticle Physics 27:4 (2007) 244-253

Authors:

J Abraham, M Aglietta, C Aguirre, D Allard, I Allekotte, P Allison, C Alvarez, J Alvarez-Muñiz, M Ambrosio, L Anchordoqui, JC Anjos, C Aramo, K Arisaka, E Armengaud, F Arneodo, F Arqueros, T Asch, H Asorey, BS Atulugama, J Aublin, M Ave, G Avila, J Bacelar, T Bäcker, D Badagnani, AF Barbosa, HMJ Barbosa, M Barkhausen, D Barnhill, SLC Barroso, P Bauleo, J Beatty, T Beau, BR Becker, KH Becker, JA Bellido, S BenZvi, C Berat, T Bergmann, P Bernardini, X Bertou, PL Biermann, P Billoir, O Blanch-Bigas, F Blanco, P Blasi, C Bleve, H Blümer, P Boghrat, M Boháčová, C Bonifazi, R Bonino, M Boratav, J Brack, JM Brunet, P Buchholz, NG Busca, KS Caballero-Mora, B Cai, DV Camin, JN Capdevielle, R Caruso, A Castellina, G Cataldi, L Cazón, R Cester, J Chauvin, A Chiavassa, JA Chinellato, A Chou, J Chye, D Claes, PDJ Clark, RW Clay, SB Clay, B Connolly, A Cordier, U Cotti, S Coutu, CE Covault, J Cronin, S Dagoret-Campagne, TD Quang, P Darriulat, K Daumiller, BR Dawson, RM de Almeida, LA de Carvalho, C De Donato, SJ de Jong, WJM de Mello, JRT de Mello Neto, I De Mitri, MAL de Oliveira, V de Souza, L del Peral, O Deligny, AD Selva, CD Fratte, H Dembinski

Abstract:

Data from the Pierre Auger Observatory are analyzed to search for anisotropies near the direction of the Galactic Centre at EeV energies. The exposure of the surface array in this part of the sky is already significantly larger than that of the fore-runner experiments. Our results do not support previous findings of localized excesses in the AGASA and SUGAR data. We set an upper bound on a point-like flux of cosmic rays arriving from the Galactic Centre which excludes several scenarios predicting sources of EeV neutrons from Sagittarius A. Also the events detected simultaneously by the surface and fluorescence detectors (the 'hybrid' data set), which have better pointing accuracy but are less numerous than those of the surface array alone, do not show any significant localized excess from this direction. © 2006 Elsevier B.V. All rights reserved.
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