作者
Pierpaolo Savina, Pedro Abreu, Marco Aglietta, Justin M Albury, Ingomar Allekotte, Alejandro Almela, Jaime Alvarez-Muniz, Rafael Alves Batista, Gioacchino Alex Anastasi, Luis A Anchordoqui, Belén Andrada, Sofia Andringa, Carla Aramo, Paulo Ricardo Araújo Ferreira, Juan Carlos Arteaga Velazquez, Hernán Gonzalo Asorey, Pedro Assis, Gualberto Avila, Alina Mihaela Badescu, Alena Bakalova, Alexandru Balaceanu, Felicia Barbato, Ricardo Jorge Barreira Luz, Karl-Heinz Becker, Jose A Bellido, Corinne Berat, Mario Edoardo Bertaina, Xavier Bertou, Peter L Biermann, Virginia Binet, Kathrin Bismark, Teresa Bister, Jonathan Biteau, Jiri Blazek, Carla Bleve, Martina Bohacova, Denise Boncioli, Carla Bonifazi, Luan Bonneau Arbeletche, Nataliia Borodai, Ana Martina Botti, Jeffrey Brack, Thomas Bretz, P Gabriel Brichetto Orchera, Florian Lukas Briechle, Peter Buchholz, Antonio Bueno, Stijn Buitink, Mario Buscemi, Max Büsken, Karen S Caballero-Mora, Lorenzo Caccianiga, Fabrizia Canfora, Ioana Caracas, Juan Miguel Carceller, Rossella Caruso, Antonella Castellina, Gabriella Cataldi, Lorenzo Cazon, Marcos Cerda, Jose Augusto Chinellato, Jiří Chudoba, Ladislav Chytka, Roger W Clay, Agustín Cobos Cerutti, Roberta Colalillo, Alan Coleman, Maria Rita Coluccia, Rúben Conceição, Antonio Condorelli, Giovanni Consolati, Fabio Convenga, Diego Correia dos Santos, Corbin Covault, Sergio Dasso, Kai Daumiller, Bruce R Dawson, Jarryd A Day, Rogerio M de Almeida, Joaquín de Jesús, Sijbrand J de Jong, Giuseppe De Mauro, João de Mello Neto, Ivan De Mitri, Jaime de Oliveira, Danelise de Oliveira Franco, Francesco de Palma, Vitor de Souza, Emanuele De Vito, Mariano del Río, Olivier Deligny, Luca Deval, Armando di Matteo, Carola Dobrigkeit, Juan Carlos D'Olivo, Luis Miguel Domingues Mendes, Rita dos Anjos, Diego dos Santos, Maria Teresa Dova, Jan Ebr, Ralph Engel, Italo Epicoco, Martin Erdmann, Carlos O Escobar, Alberto Etchegoyen, Heino Falcke, John Farmer, Glennys R Farrar, Anderson Fauth, Norberto Fazzini, Fridtjof Feldbusch, Francesco Fenu, Brian Fick, Juan Manuel Figueira, Andrej Filipcic, Thomas Fitoussi, Tomáš Fodran, Martín Miguel Freire, Toshihiro Fujii, Alan Fuster, Cristina Galea, Claudio Galelli, Beatriz García, Adrianna Luz García Vegas, Hartmut Gemmeke, Flavia Gesualdi, Alexandru Gherghel-Lascu, Piera Luisa Ghia, Ugo Giaccari, Marco Giammarchi, Jonas Glombitza, Fabian Gobbi, Geraldina Golup, Mariano Gómez Berisso, Primo F Gómez Vitale, Juan Pablo Gongora, Juan Manuel González, Nicolas Martin Gonzalez, Isabel Goos, Dariusz Gora, Alessio Gorgi, Marvin Gottowik, Trent D Grubb, Germano Guedes, Eleonora Guido, Steffen Hahn, Petr Hamal, Matías Rolf Hampel, Patricia María Hansen, Diego Harari
发表日期
2021
期刊
POS PROCEEDINGS OF SCIENCE
卷号
395
页码范围
373
出版商
Sissa Medialab srl
简介
The Pierre Auger Observatory is the most sensitive detector to primary photons with energies above∼ 0.2 EeV. It measures extensive air showers using a hybrid technique that combines a fluorescence detector (FD) with a ground array of particle detectors (SD). The signatures of a photon-induced air shower are a larger atmospheric depth at the shower maximum (Xmax) and a steeper lateral distribution function, along with a lower number of muons with respect to the bulk of hadron-induced background. Using observables measured by the FD and SD, three photon searches in different energy bands are performed. In particular, between threshold energies of 1-10 EeV, a new analysis technique has been developed by combining the FD-based measurement of Xmax with the SD signal through a parameter related to its muon content, derived from the universality of the air showers. This technique has led to a better photon/hadron separation and, consequently, to a higher search sensitivity, resulting in a tighter upper limit than before. The outcome of this new analysis is presented here, along with previous results in the energy ranges below 1 EeV and above 10 EeV. From the data collected by the Pierre Auger Observatory in about 15 years of operation, the most stringent constraints on the fraction of photons in the cosmic flux are set over almost three decades in energy.
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P Savina, P Abreu, M Aglietta, JM Albury, I Allekotte… - POS PROCEEDINGS OF SCIENCE, 2021