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Proceedings of the Workshop - HERA and the LHC: Workshop Series on the Implications of HERA for LHC Physics, HERA-LHC 2006 - 2008 (2009) 8-52

Authors:

S Moch, M Rogal, JAM Vermaseren, A Vogt, G Altarelli, RD Ball, M Ciafaloni, D Colferai, S Forte, GP Salam, A Stásto, RS Thorne, CD White, G Beuf, F Caola, F Gelis, L Motyka, C Royon, D Sálek, AM Stásto

Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory

Astroparticle Physics 31:6 (2009) 399-406

Authors:

J Abraham, P Abreu, M Aglietta, C Aguirre, EJ Ahn, D Allard, I Allekotte, J Allen, P Allison, J Alvarez-Muñiz, M Ambrosio, L Anchordoqui, S Andringa, A Anzalone, C Aramo, S Argiró, K Arisaka, F Arneodo, F Arqueros, T Asch, H Asorey, P Assis, J Aublin, M Ave, G Avila, T Bäcker, D Badagnani, KB Barber, AF Barbosa, SLC Barroso, B Baughman, P Bauleo, JJ Beatty, T Beau, BR Becker, KH Becker, A Bellétoile, JA Bellido, S BenZvi, C Berat, P Bernardini, X Bertou, PL Biermann, P Billoir, O Blanch-Bigas, F Blanco, C Bleve, H Blümer, M Boháčová, C Bonifazi, R Bonino, J Brack, P Brogueira, WC Brown, R Bruijn, P Buchholz, A Bueno, RE Burton, NG Busca, KS Caballero-Mora, L Caramete, R Caruso, W Carvalho, A Castellina, O Catalano, L Cazon, R Cester, J Chauvin, A Chiavassa, JA Chinellato, A Chou, J Chudoba, J Chye, RW Clay, E Colombo, R Conceição, B Connolly, F Contreras, J Coppens, A Cordier, U Cotti, S Coutu, CE Covault, A Creusot, A Criss, J Cronin, A Curutiu, S Dagoret-Campagne, K Daumiller, BR Dawson, RM de Almeida, M De Domenico, C De Donato, SJ de Jong, G De La Vega, WJM de Mello, JRT de Mello Neto, I De Mitri, V de Souza, G Decerprit

Abstract:

From direct observations of the longitudinal development of ultra-high energy air showers performed with the Pierre Auger Observatory, upper limits of 3.8%, 2.4%, 3.5% and 11.7% (at 95% c.l.) are obtained on the fraction of cosmic-ray photons above 2, 3, 5 and 10 EeV (1 EeV ≡ 1018 eV), respectively. These are the first experimental limits on ultra-high energy photons at energies below 10 EeV. The results complement previous constraints on top-down models from array data and they reduce systematic uncertainties in the interpretation of shower data in terms of primary flux, nuclear composition and proton-air cross-section. © 2009 Elsevier B.V. All rights reserved.
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A Higher Order Perturbative Parton Evolution Toolkit (HOPPET)

Computer Physics Communications Elsevier 180:1 (2009) 120-156

Authors:

GP Salam, J Rojo
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Gauge threshold corrections for local type-IIB/F-theory GUTs

PHYSICAL REVIEW D 80:10 (2009) ARTN 106004

Authors:

Joseph P Conlon, Eran Palti
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Holographic Quantum Liquid

PHYSICAL REVIEW LETTERS 102:5 (2009) ARTN 051602

Authors:

A Karch, DT Son, AO Starinets
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