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316 results on '"Zas, Enrique"'

1. On the transition radiation interpretation of anomalous ANITA events

Author: Ammerman-Yebra, Juan, Alvarez-Muñiz, Jaime, and Zas, Enrique
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: The Antarctic Impulsive Transient Antenna (ANITA) detector has observed several radio pulses coming from the surface of the ice cap at the South Pole. These pulses were attributed to upward-going atmospheric particle showers instead of the downward-going showers induced by cosmic rays that exhibit a characteristic polarity inversion of the radio signal due to reflection in the ice. Coherent transition radiation from cosmic-ray showers developing in the atmosphere and intercepting the ice surface has been suggested as a possible and alternative explanation of these so-called "anomalous" events. To test this interpretation, we have developed an extension of ZHS, a program to calculate coherent pulses from electromagnetic showers, to deal with showers that transit a planar interface between two homogeneous and dielectric media, including transition radiation. By considering different geometries, it is found that all pulses from air showers intercepting the ice surface and detected at the height of ANITA, display the same polarity as pulses emitted by ultra-high-energy cosmic-ray showers that fully develop in the atmosphere and are reflected on the ice. We find that transition radiation is disfavored as a possible explanation of the anomalous ANITA events.
Published: 2023

2. Secondary Lepton Production, Propagation, and Interactions with NuLeptonSim

Author: Cummings, Austin, Krebs, Ryan, Wissel, Stephanie, Alvarez-Muñiz, Jaime, Carvalho Jr., Washington R., Romero-Wolf, Andrés, Schoorlemmer, Harm, and Zas, Enrique
Subjects: High Energy Physics - Phenomenology
Abstract: Charged current interactions of neutrinos inside the Earth can result in secondary muons and {\tau} - leptons which are detectable by a large swath of existing and planned neutrino experiments through a wide variety of event topologies. Consideration of such events can improve detector performance and provide unique signatures which help with event reconstruction. In this work, we describe NuLeptonSim, a propagation tool for neutrinos and charged leptons that builds on the fast NuTauSim framework. NuLeptonSim considers energy losses of charged leptons, modelled both continuously for performance or stochastically for accuracy, as well as interaction models for all flavors of neutrinos, including the Glashow resonance. We demonstrate the results from including these effects on the Earth emergence probability of various charged leptons from different flavors of primary neutrino and their corresponding energy distributions. We find that the emergence probability of muons can be higher than that of taus for energies below 100 PeV, whether from a primary muon or {\tau} neutrino, and that the Glashow resonance contributes to a surplus of emerging leptons near the resonant energy.
Published: 2023

3. Density and magnetic intensity dependence of radio pulses induced by energetic air showers

Author: Ammerman-Yebra, Juan, Alvarez-Muñiz, Jaime, and Zas, Enrique
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We have studied the effect of changing the density and magnetic field strength in the coherent pulses that are emitted as energetic showers develop in the atmosphere. For this purpose we have developed an extension of ZHS, a program to calculate coherent radio pulses from electromagnetic showers in homogeneous media, to account for the Lorentz force due to a magnetic field. This makes it possible to perform quite realistic simulations of radio pulses from air showers in a medium similar to the atmosphere but without variations of density with altitude. The effects of independently changing the density, the refractive index and the magnetic field strength are studied in the frequency domain for observers in the Cherenkov direction at far distances from the shower. This approach is particularly enlightening providing an explanation of the spectral behavior of the induced electric field in terms of shower development parameters. More importantly, it clearly displays the complex scaling properties of the pulses as density and magnetic field intensity are varied. The usually assumed linear behavior of electric field amplitude with magnetic field intensity is shown to hold up to a given magnetic field strength at which the extra time delays due to the deflection in the magnetic field break it. Scaling properties of the pulses are obtained as the density of air decreases relative to sea level. A remarkably accurate scaling law is obtained that relates the spectra of pulses obtained when reducing the density and increasing the magnetic field., Comment: 27 pages, 14 figures
Published: 2023
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4. High-Energy and Ultra-High-Energy Neutrinos

Author: Ackermann, Markus, Agarwalla, Sanjib K., Alvarez-Muñiz, Jaime, Batista, Rafael Alves, Argüelles, Carlos A., Bustamante, Mauricio, Clark, Brian A., Cummings, Austin, Das, Sudipta, Decoene, Valentin, Denton, Peter B., Dornic, Damien, Dzhilkibaev, Zhan-Arys, Farzan, Yasaman, Garcia, Alfonso, Garzelli, Maria Vittoria, Glaser, Christian, Heijboer, Aart, Hörandel, Jörg R., Illuminati, Giulia, Jeong, Yu Seon, Kelley, John L., Kelly, Kevin J., Kheirandish, Ali, Klein, Spencer R., Krizmanic, John F., Larson, Michael J., Lu, Lu, Murase, Kohta, Narang, Ashish, Otte, Nepomuk, Prechelt, Remy L., Prohira, Steven, Reno, Mary Hall, Resconi, Elisa, Santander, Marcos, Suvorova, Olga Vasil'evna, Valera, Victor B., Vandenbroucke, Justin, Wiencke, Lawrence, Wissel, Stephanie, Yoshida, Shigeru, Yuan, Tianlu, Zas, Enrique, Zhelnin, Pavel, and Zhou, Bei
Subjects: High Energy Physics - Phenomenology, Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract: Astrophysical neutrinos are excellent probes of astroparticle physics and high-energy physics. With energies far beyond solar, supernovae, atmospheric, and accelerator neutrinos, high-energy and ultra-high-energy neutrinos probe fundamental physics from the TeV scale to the EeV scale and beyond. They are sensitive to physics both within and beyond the Standard Model through their production mechanisms and in their propagation over cosmological distances. They carry unique information about their extreme non-thermal sources by giving insight into regions that are opaque to electromagnetic radiation. This white paper describes the opportunities astrophysical neutrino observations offer for astrophysics and high-energy physics, today and in coming years., Comment: Contribution to Snowmass 2021, updated to include community feedback
Published: 2022

5. Tau Neutrinos in the Next Decade: from GeV to EeV

Author: Abraham, Roshan Mammen, Alvarez-Muñiz, Jaime, Argüelles, Carlos A., Ariga, Akitaka, Ariga, Tomoko, Aurisano, Adam, Autiero, Dario, Bishai, Mary, Bostan, Nilay, Bustamante, Mauricio, Cummings, Austin, Decoene, Valentin, de Gouvêa, André, De Lellis, Giovanni, De Roeck, Albert, Denton, Peter B., Di Crescenzo, Antonia, Diwan, Milind V., Farzan, Yasaman, Fedynitch, Anatoli, Feng, Jonathan L., Fields, Laura J., Garcia, Alfonso, Garzelli, Maria Vittoria, Gehrlein, Julia, Glaser, Christian, Grzelak, Katarzyna, Hallmann, Steffen, Hewes, V, Indumathi, D., Ismail, Ahmed, Jana, Sudip, Jeong, Yu Seon, Kelly, Kevin J., Klein, Spencer R., Kling, Felix, Kosc, Thomas, Kose, Umut, Koskinen, D. Jason, Krizmanic, John, Lazar, Jeff, Li, Yichen, Martinez-Soler, Ivan, Mocioiu, Irina, Nam, Jiwoo, Niess, Valentin, Otte, Nepomuk, Patel, Sameer, Petti, Roberto, Prechelt, Remy L., Prohira, Steven, Rajaoalisoa, Miriama, Reno, Mary Hall, Safa, Ibrahim, Sarasty-Segura, Carlos, Senthil, R. Thiru, Stachurska, Juliana, Tomalak, Oleksandr, Trojanowski, Sebastian, Wendell, Roger Alexandre, Williams, Dawn, Wissel, Stephanie, Yaeggy, Barbara, Zas, Enrique, Zhelnin, Pavel, and Zhu, Jing-yu
Subjects: High Energy Physics - Phenomenology, Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract: Tau neutrinos are the least studied particle in the Standard Model. This whitepaper discusses the current and expected upcoming status of tau neutrino physics with attention to the broad experimental and theoretical landscape spanning long-baseline, beam-dump, collider, and astrophysical experiments. This whitepaper was prepared as a part of the NuTau2021 Workshop., Comment: 155 pages, 63 figures, 10 tables, 69 endorsers, comments welcome, Contribution to Snowmass 2021. v2: published version
Published: 2022
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6. CORSIKA 8 -- Contributions to the 37th International Cosmic Ray Conference in Berlin Germany (ICRC 2021)

Author: Alameddine, Jean-Marco, Albrecht, Johannes, Alvarez-Muniz, Jaime, Alves Jr, Antonio Augusto, Arrabito, Luisa, Baack, Dominik, Bernlöhr, Konrad, Bleicher, Marcus, Bregeon, Johan, Carrere, Mathieu, Dembinski, Hans, Elfner, Hannah, Elsässer, Dominik, Engel, Ralph, Fan, Hu, Fedynitch, Anatoli, Heck, Dieter, Huege, Tim, Kampert, Karl-Heinz, Karastathis, Nikolaos, Nellen, Lukas, Nöthe, Maximilian, Parello, David, Pierog, Tanguy, Pokrandt, Maria, Poctarev, Anton, Prechelt, Remy, Reininghaus, Maximilian, Rhode, Wolfgang, Riehn, Felix, Sackel, Maximilian, Sandrock, Alexander, Sampathkumar, Pranav, Schmelling, Michael, Schmidt, André, Sigl, Günter, Soedingrekso, Jan, Spaan, Bernhard, Xu, Donglian, Ammerman-Yebra, Juan, Zas, Enrique, and Ulrich, Ralf
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: Compilation of the six contributions to the ICRC conference 2021 by the CORSIKA 8 Collaboration. The status of the project is illustrated. In particular, the secondary hadron as well as the electromagnetic cascades are being validated individually, and current results are reviewed. A novel framework for radio emission simulations is presented, which is designed given the modular nature of CORSIKA 8 to support, both, the CoREAS as well as the ZHS formalism. At the same time, first Cherenkov emission calculations are shown which are based on CORSIKA 8 coupled with a GPU Cherenkov emission code. Finally, a new powerful feature of CORSIKA 8 is illustrated, where the entire genealogy of air shower particles can be studied in all details., Comment: ICRC 2021 conference, 6 proceedings, 51 pages
Published: 2021

7. Radio Detection of Ultra-high Energy Cosmic Rays with Low Lunar Orbiting SmallSats

Author: Romero-Wolf, Andrés, Alvarez-Muñiz, Jaime, Anchordoqui, Luis A., Bergman, Douglas, Carvalho Jr., Washington, Cummings, Austin L., Gorham, Peter, Handmer, Casey J., Harvey, Nate, Krizmanic, John, Nishimura, Kurtis, Prechelt, Remy, Reno, Mary Hall, Schoorlemmer, Harm, Varner, Gary, Venters, Tonia, Wissel, Stephanie, and Zas, Enrique
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: Ultra-high energy cosmic rays (UHECRs) are the most energetic particles observed and serve as a probe of the extreme universe. A key question to understanding the violent processes responsible for their acceleration is identifying which classes of astrophysical objects (active galactic nuclei or starburst galaxies, for example) correlate to their arrival directions. While source clustering is limited by deflections in the Galactic magnetic field, at the highest energies the scattering angles are sufficiently low to retain correlation with source catalogues. While there have been several studies attempting to identify source catalogue correlations with data from the Pierre Auger Observatory and the Telescope Array, the significance above an isotropic background has not yet reached the threshold for discovery. It has been known for several decades that a full-sky UHECR observatory would provide a substantial increase in sensitivity to the anisotropic component of UHECRs. There have been several concepts developed in that time targeting the identification of UHECR sources such as OWL, JEM-EUSO, and POEMMA, using fluorescence detection in the Earth's atmosphere from orbit. In this white paper, we present a concept called the Zettavolt Askaryan Polarimeter (ZAP), designed to identify the source of UHECRs using radio detection of the Askaryan radio emissions produced by UHECRs interacting in the Moon's regolith from low lunar orbit., Comment: 6 pages, 2 figures, letter of interest submitted to Snowmass 2021
Published: 2020

8. Prospects for High-Elevation Radio Detection of >100 PeV Tau Neutrinos

Author: Wissel, Stephanie, Romero-Wolf, Andrés, Schoorlemmer, Harm, Carvalho Jr., Washington R., Alvarez-Muñiz, Jaime, Zas, Enrique, Cummings, Austin, Deaconu, Cosmin, Hughes, Kaeli, Ludwig, Andrew, Morancy, Joalda, Oberla, Eric, Paciaroni, Caroline, Prohira, Steven, Southall, Dan, Stapel-Kalat, Max, Strutt, Ben, Vasquez, Mercedes, and Vieregg, Abigail
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract: Tau neutrinos are expected to comprise roughly one third of both the astrophysical and cosmogenic neutrino flux, but currently the flavor ratio is poorly constrained and the expected flux at energies above $10^{17}$ eV is low. We present a detector concept aimed at measuring the diffuse flux of tau neutrinos in this energy range via a high-elevation mountaintop detector using the radio technique. The detector searches for radio signals from upgoing air showers generated by Earth-skimming tau neutrinos. Signals from several antennas in a compact array are coherently summed at the trigger level, permitting not only directional masking of anthropogenic backgrounds, but also a low trigger threshold. This design takes advantage of both the large viewing area available at high-elevation sites and the nearly full duty cycle available to radio instruments. We present trade studies that consider the station elevation, frequency band, number of antennas in the array, and the trigger threshold to develop a highly efficient station design. Such a mountaintop detector can achieve a factor of ten improvement in acceptance over existing instruments with 100 independent stations. With 1000 stations and three years of observation, it can achieve a sensitivity to an integrated $\mathcal{E}^{-2}$ flux of $<10^{-9}$ GeV cm$^{-2}$ sr$^{-1}$ s$^{-1}$, in the range of the expected flux of all-flavor cosmogenic neutrinos assuming a pure iron cosmic-ray composition., Comment: 26 pages, 11 figures
Published: 2020
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9. Askaryan radiation from neutrino-induced showers in ice

Author: Alvarez-Muñiz, Jaime, Hansen, P. M., Romero-Wolf, Andrés, and Zas, Enrique
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We present a semi-analytical method for the calculation of coherent Askaryan radiation in showers induced by neutrinos of any flavor in ice. We compare our results with those of a full Monte Carlo simulation based on the ZHAireS code. This approach is able to reproduce the vector potential and hence electric field at any experimentally relevant observer position in the time domain. This work extends published results only valid for electron-induced showers. We establish the validity of the semi-analytical calculation of the radio signal produced by all types of neutrino-induced showers in ice. The method is computationally efficient and only requires as inputs the longitudinal charge excess profile of the showers and a parameterization of the vector potential in the far-field region of the shower at the Cherenkov angle that we also provide. Our methodology avoids tracking the contributions to the electric field from millions of particles every time the radio pulse has to be calculated at a given observer position. These results can be readily used in the interpretation of the data taken by experiments, and in the planning and design of future initiatives based on the radio technique in ice., Comment: 18 pages, 11 figures. Accepted in Phys. Rev. D
Published: 2020
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10. An Andean Deep-Valley Detector for High-Energy Tau Neutrinos

Author: Romero-Wolf, Andres, Alvarez-Muñiz, Jaime, Carvalho Jr., Washington R., Cummings, Austin, Schoorlemmer, Harm, Wissel, Stephanie, Zas, Enrique, Argüelles, Carlos, Barreda, Horacio, Bazo, Jose, Bellido, Jose, Bustamante, Mauricio, Gago, Alberto, and Perca, Rolando
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract: High-energy astrophysical neutrinos, recently discovered by IceCube up to energies of several PeV, opened a new window to the high-energy Universe. Yet much remains to be known. IceCube has excellent muon flavor identification, but tau flavor identification is challenging. This limits its ability to probe neutrino physics and astrophysics. To address this limitation, we present a concept for a large-scale observatory of astrophysical tau neutrinos in the 1-100 PeV range, where a flux is guaranteed to exist. Its detection would allow us to characterize the neutrino sources observed by IceCube, to discover new ones, and test neutrino physics at high energies. The deep-valley air-shower array concept that we present provides highly background-suppressed neutrino detection with pointing resolution <1 degree, allowing us to begin the era of high-energy tau-neutrino astronomy., Comment: 15 pages, 6 figures, white paper submitted to the Latin American Strategy Forum for Research Infrastructure (LASF4RI)
Published: 2020

11. Erratum: A Comprehensive Approach to Tau-Lepton Production by High-Energy Tau Neutrinos Propagating Through Earth [Phys. Rev. D 97, 023021 (2018), arXiv:1707.00334]

Author: Alvarez-Muñiz, Jaime, Carvalho Jr., Washington R., Cummings, Austin L., Payet, Kévin, Romero-Wolf, Andrés, Schoorlemmer, Harm, and Zas, Enrique
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We report an error found during independent review of the NuTauSim publicly available code \url{https://github.com/harmscho/NuTauSim} that forms the basis of this publication. The error in the code was in tracking the density of the medium during particle propagation. After the first interaction, the code was referencing the depth of penetration back to the surface of the Earth rather than the location of the last interaction. The results were obtained using densities that were systematically underestimated when the particle was traversing the inner layers of the Earth by assigning the density of either ice or bedrock, depending on the particle energy or ice thickness of the simulation. This error was fixed and the repository updated on September 29, 2018., Comment: erratum to arXiv:1707.00334
Published: 2019
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12. Design and initial performance of the prototype for the BEACON instrument for detection of ultrahigh energy particles

Author: Southall, Dan, Deaconu, Cosmin, Decoene, Valentin, Oberla, Eric, Zeolla, Andrew, Alvarez-Muñiz, Jaime, Cummings, Austin, Curtis-Ginsberg, Zach, Hendrick, Angus, Hughes, Kaeli, Krebs, Ryan, Ludwig, Andrew, Mulrey, Katharine, Prohira, Steven, Carvalho, Washington Rodrigues de, Jr., Rodriguez, Andres, Romero-Wolf, Andres, Schoorlemmer, Harm, Vieregg, Abigail G., Wissel, Stephanie A., and Zas, Enrique
Published: 2023
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13. High-energy and ultra-high-energy neutrinos: A Snowmass white paper

Author: Ackermann, Markus, Bustamante, Mauricio, Lu, Lu, Otte, Nepomuk, Reno, Mary Hall, Wissel, Stephanie, Agarwalla, Sanjib K., Alvarez-Muñiz, Jaime, Alves Batista, Rafael, Argüelles, Carlos A., Clark, Brian A., Cummings, Austin, Das, Sudipta, Decoene, Valentin, Denton, Peter B., Dornic, Damien, Dzhilkibaev, Zhan-Arys, Farzan, Yasaman, Garcia, Alfonso, Garzelli, Maria Vittoria, Glaser, Christian, Heijboer, Aart, Hörandel, Jörg R., Illuminati, Giulia, Seon Jeong, Yu, Kelley, John L., Kelly, Kevin J., Kheirandish, Ali, Klein, Spencer R., Krizmanic, John F., Larson, Michael J., Murase, Kohta, Narang, Ashish, Prechelt, Remy L., Prohira, Steven, Resconi, Elisa, Santander, Marcos, Valera, Victor B., Vandenbroucke, Justin, Vasil'evna Suvorova, Olga, Wiencke, Lawrence, Yoshida, Shigeru, Yuan, Tianlu, Zas, Enrique, Zhelnin, Pavel, Zhou, Bei, Anchordoqui, Luis A., Ashida, Yosuke, Bagheri, Mahdi, Balagopal, Aswathi, V, Basu, Vedant, Beatty, James, Bechtol, Keith, Bell, Nicole, Bishop, Abigail, Book, Julia, Brown, Anthony, Burgman, Alexander, Campana, Michael, Chau, Nhan, Chen, Thomas Y., Coleman, Alan, Connolly, Amy, Conrad, Janet M., Correa, Pablo, Creque-Sarbinowski, Cyril, Curtis-Ginsberg, Zachary, Dasgupta, Paramita, De Kockere, Simon, de Vries, Krijn, Deaconu, Cosmin, Desai, Abhishek, DeYoung, Tyce, di Matteo, Armando, Elsaesser, Dominik, Fürst, Phillip, Fan, Kwok Lung, Fedynitch, Anatoli, Fox, Derek, Ganster, Erik, Minh, Martin Ha, Haack, Christian, Hallman, Steffen, Halzen, Francis, Haungs, Andreas, Ishihara, Aya, Judd, Eleanor, Karg, Timo, Karle, Albrecht, Katori, Teppei, Kochocki, Alina, Kopper, Claudio, Kowalski, Marek, Kravchenko, Ilya, Kurahashi, Naoko, Lamoureux, Mathieu, León Vargas, Hermes, Lincetto, Massimiliano, Liu, Qinrui, Madsen, Jim, Makino, Yuya, Mammo, Joseph, Marka, Zsuzsa, Mayotte, Eric, Meagher, Kevin, Meier, Maximilian, Miramonti, Lino, Moulai, Marjon, Mulrey, Katharine, Muzio, Marco, Naab, Richard, Nelles, Anna, Nichols, William, Nozdrina, Alisa, O'Sullivan, Erin, OD́ell, Vivian, Osborne, Jesse, Pandey, Vishvas, Paudel, Ek Narayan, Pizzuto, Alex, Plum, Mattias, Pobes Aranda, Carlos, Pyras, Lilly, Raab, Christoph, Rechav, Zoe, Rojo, Juan, Romero Matamala, Oscar, Savina, Pierpaolo, Schroeder, Frank, Schumacher, Lisa, Sciutto, Sergio, Sclafani, Stephen, Ful Hossain Seikh, Mohammad, Silva, Manuel, Singh, Rajeev, Smith, Daniel, Spencer, Samuel Timothy, Springer, Robert Wayne, Stachurska, Juliana, Suvorova, Olga, Taboada, Ignacio, Toscano, Simona, Tueros, Matias, Twagirayezu, Jean Pierre, van Eijndhoven, Nick, Veres, Péter, Vieregg, Abigail, Wang, Winnie, Whitehorn, Nathan, Winter, Walter, Yildizci, Emre, and Yu, Shiqi
Published: 2022
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14. A Comprehensive Approach to Tau-Lepton Production by High-Energy Tau Neutrinos Propagating Through Earth

Author: Alvarez-Muñiz, Jaime, Carvalho Jr, Washington R., Payet, Kévin, Romero-Wolf, Andrés, Schoorlemmer, Harm, and Zas, Enrique
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: There has been a recent surge in interest in the detection of $\tau$ lepton-induced air showers from detectors at altitude. When a $\tau$ neutrino ($\nu_\tau$) enters the Earth it produces $\tau$ leptons as a result of nuclear charged current interactions. In some cases, this process results in a $\tau$ lepton exiting the surface of the Earth, which can subsequently decay in the atmosphere and produce an extensive air shower. These upward-going air showers can be detected via fluorescence, optical Cherenkov, or geomagnetic radio emission. Several experiments have been proposed to detect these signals. We present a comprehensive simulation of the production of $\tau$ leptons by $\nu_\tau$'s propagating through Earth to aid the design of future experiments. These simulations for $\nu_\tau$'s and leptons in the energy range from $10^{15}$ eV to $10^{21}$ eV treat the full range of incidence angles from Earth-skimming to diametrically-traversing. Propagation of $\nu_\tau$'s and leptons include the effects of rock and an ocean or ice layer of various thicknesses. The interaction models include $\nu_\tau$ regeneration and account for uncertainties in the Standard Model neutrino cross-section and in the photo-nuclear contribution to the $\tau$ energy loss rate., Comment: 13 pages, 14 figures
Published: 2017
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15. On the transition radiation interpretation of anomalous ANITA events

Author: Ammerman-Yebra, Juan, primary, Alvarez-Muñiz, Jaime, additional, and Zas, Enrique, additional
Published: 2024
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16. Can transition radiation explain the ANITA event 3985267?

Author: Motloch, Pavel, Alvarez-Muñiz, Jaime, Privitera, Paolo, and Zas, Enrique
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We investigate whether transition radiation from a particle shower crossing the interface between Earth and air and induced by an Earth-skimming neutrino can explain the upward event announced recently by the ANITA Collaboration. While the properties of the observed signal can in principle be explained with transition radiation, the flux necessary for a successful explanation is in tension with the current best limits from the Pierre Auger Observatory, the IceCube neutrino detector and the ANITA balloon. We also show that in this scenario, the direction of the incoming neutrino is determined precisely to within a few degrees, from the polarization properties of the observed events and thanks to the Earth opacity to ultra high energy neutrinos., Comment: 8 pages, 4 figures, version accepted to PRD
Published: 2016
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17. Measurement of the Radiation Energy in the Radio Signal of Extensive Air Showers as a Universal Estimator of Cosmic-Ray Energy

Author: The Pierre Auger Collaboration, Aab, Alexander, Abreu, Pedro, Aglietta, Marco, Ahn, Eun-Joo, Samarai, Imen Al, Albuquerque, Ivone, Allekotte, Ingomar, Allison, Patrick, Almela, Alejandro, Castillo, Jesus Alvarez, Alvarez-Muñiz, Jaime, Batista, Rafael Alves, Ambrosio, Michelangelo, Aminaei, Amin, Anastasi, Gioacchino Alex, Anchordoqui, Luis, Andringa, Sofia, Aramo, Carla, Arqueros, Fernando, Arsene, Nicusor, Asorey, Hernán Gonzalo, Assis, Pedro, Aublin, Julien, Avila, Gualberto, Awal, Nafiun, Badescu, Alina Mihaela, Baus, Colin, Beatty, Jim, Becker, Karl Heinz, Bellido, Jose A., Berat, Corinne, Bertaina, Mario Edoardo, Bertou, Xavier, Biermann, Peter, Billoir, Pierre, Blaess, Simon G., Blanco, Alberto, Blanco, Miguel, Blazek, Jiri, Bleve, Carla, Blümer, Hans, Boháčová, Martina, Boncioli, Denise, Bonifazi, Carla, Borodai, Nataliia, Brack, Jeffrey, Brancus, Iliana, Bretz, Thomas, Bridgeman, Ariel, Brogueira, Pedro, Buchholz, Peter, Bueno, Antonio, Buitink, Stijn, Buscemi, Mario, Caballero-Mora, Karen S., Caccianiga, Barbara, Caccianiga, Lorenzo, Candusso, Marina, Caramete, Laurentiu, Caruso, Rossella, Castellina, Antonella, Cataldi, Gabriella, Cazon, Lorenzo, Cester, Rosanna, Chavez, Alan G., Chiavassa, Andrea, Chinellato, Jose Augusto, Chudoba, Jiri, Cilmo, Marco, Clay, Roger W, Cocciolo, Giuseppe, Colalillo, Roberta, Coleman, Alan, Collica, Laura, Coluccia, Maria Rita, Conceição, Ruben, Contreras, Fernando, Cooper, Mathew J., Cordier, Alain, Coutu, Stephane, Covault, Corbin, Cronin, James, Dallier, Richard, Daniel, Bruno, Dasso, Sergio, Daumiller, Kai, Dawson, Bruce R., de Almeida, Rogerio M., de Jong, Sijbrand J., De Mauro, Giuseppe, Neto, Joao de Mello, De Mitri, Ivan, de Oliveira, Jaime, de Souza, Vitor, del Peral, Luis, Deligny, Olivier, Dhital, Niraj, Di Giulio, Claudio, Di Matteo, Armando, Diaz, Johana Chirinos, Castro, Mary Lucia Díaz, Diogo, Francisco, Dobrigkeit, Carola, Docters, Wendy, D'Olivo, Juan Carlos, Dorofeev, Alexei, Hasankiadeh, Qader Dorosti, Anjos, Rita dos, Dova, Maria Teresa, Ebr, Jan, Engel, Ralph, Erdmann, Martin, Erfani, Mona, Escobar, Carlos O., Espadanal, Joao, Etchegoyen, Alberto, Falcke, Heino, Fang, Ke, Farrar, Glennys, Fauth, Anderson, Fazzini, Norberto, Ferguson, Andrew P., Fick, Brian, Figueira, Juan Manuel, Filevich, Alberto, Filipčič, Andrej, Fratu, Octavian, Freire, Martín Miguel, Fujii, Toshihiro, García, Beatriz, Garcia-Gamez, Diego, Garcia-Pinto, Diego, Gate, Florian, Gemmeke, Hartmut, Gherghel-Lascu, Alexandru, Ghia, Piera Luisa, Giaccari, Ugo, Giammarchi, Marco, Giller, Maria, Głas, Dariusz, Glaser, Christian, Glass, Henry, Golup, Geraldina, Berisso, Mariano Gómez, Vitale, Primo F. Gómez, González, Nicolás, Gookin, Ben, Gordon, Jacob, Gorgi, Alessio, Gorham, Peter, Gouffon, Philippe, Griffith, Nathan, Grillo, Aurelio, Grubb, Trent D., Guarino, Fausto, Guedes, Germano, Hampel, Matías Rolf, Hansen, Patricia, Harari, Diego, Harrison, Thomas A., Hartmann, Sebastian, Harton, John, Haungs, Andreas, Hebbeker, Thomas, Heck, Dieter, Heimann, Philipp, Herve, Alexander E., Hill, Gary C., Hojvat, Carlos, Hollon, Nicholas, Holt, Ewa, Homola, Piotr, Hörandel, Jörg, Horvath, Pavel, Hrabovský, Miroslav, Huber, Daniel, Huege, Tim, Insolia, Antonio, Isar, Paula Gina, Jandt, Ingolf, Jansen, Stefan, Jarne, Cecilia, Johnsen, Jeffrey A., Josebachuili, Mariela, Kääpä, Alex, Kambeitz, Olga, Kampert, Karl Heinz, Kasper, Peter, Katkov, Igor, Keilhauer, Bianca, Kemp, Ernesto, Kieckhafer, Roger, Klages, Hans, Kleifges, Matthias, Kleinfeller, Jonny, Krause, Raphael, Krohm, Nicole, Kuempel, Daniel, Mezek, Gasper Kukec, Kunka, Norbert, Awad, Alaa Metwaly Kuotb, LaHurd, Danielle, Latronico, Luca, Lauer, Robert, Lauscher, Markus, Lautridou, Pascal, Coz, Sandra Le, Lebrun, Didier, Lebrun, Paul, de Oliveira, Marcelo Augusto Leigui, Letessier-Selvon, Antoine, Lhenry-Yvon, Isabelle, Link, Katrin, Lopes, Luis, López, Rebeca, Casado, Aida López, Louedec, Karim, Lucero, Agustin, Malacari, Max, Mallamaci, Manuela, Maller, Jennifer, Mandat, Dusan, Mantsch, Paul, Mariazzi, Analisa, Marin, Vincent, Mariş, Ioana, Marsella, Giovanni, Martello, Daniele, Martinez, Humberto, Bravo, Oscar Martínez, Martraire, Diane, Meza, Jimmy Masías, Mathes, Hermann-Josef, Mathys, Sebastian, Matthews, James, Matthews, John, Matthiae, Giorgio, Maurizio, Daniela, Mayotte, Eric, Mazur, Peter, Medina, Carlos, Medina-Tanco, Gustavo, Meissner, Rebecca, Mello, Victor, Melo, Diego, Menshikov, Alexander, Messina, Stefano, Micheletti, Maria Isabel, Middendorf, Lukas, Minaya, Ignacio A., Miramonti, Lino, Mitrica, Bogdan, Molina-Bueno, Laura, Mollerach, Silvia, Montanet, François, Morello, Carlo, Mostafá, Miguel, Moura, Celio A., Muller, Marcio Aparecido, Müller, Gero, Müller, Sarah, Navas, Sergio, Necesal, Petr, Nellen, Lukas, Nelles, Anna, Neuser, Jens, Nguyen, Phong H., Niculescu-Oglinzanu, Mihai, Niechciol, Marcus, Niemietz, Lukas, Niggemann, Tim, Nitz, Dave, Nosek, Dalibor, Novotny, Vladimir, Nožka, Lyberis, Núñez, Luis, Ochilo, Livingstone, Oikonomou, Foteini, Olinto, Angela, Pacheco, Noelia, Selmi-Dei, Daniel Pakk, Palatka, Miroslav, Pallotta, Juan, Papenbreer, Philipp, Parente, Gonzalo, Parra, Alejandra, Paul, Thomas, Pech, Miroslav, Pękala, Jan, Pelayo, Rodrigo, Pepe, Iuri, Perrone, Lorenzo, Petermann, Emily, Peters, Christine, Petrera, Sergio, Petrov, Yevgeniy, Phuntsok, Jamyang, Piegaia, Ricardo, Pierog, Tanguy, Pieroni, Pablo, Pimenta, Mário, Pirronello, Valerio, Platino, Manuel, Plum, Matthias, Porcelli, Alessio, Porowski, Czeslaw, Prado, Raul Ribeiro, Privitera, Paolo, Prouza, Michael, Quel, Eduardo J, Querchfeld, Sven, Quinn, Sean, Rautenberg, Julian, Ravel, Olivier, Ravignani, Diego, Reinert, Darius, Revenu, Benoît, Ridky, Jan, Risse, Markus, Ristori, Pablo, Rizi, Vincenzo, de Carvalho, Washington Rodrigues, Rojo, Jorge Rubén Rodriguez, Rodríguez-Frías, Maria Dolores, Rogozin, Dmytro, Rosado, Jaime, Roth, Markus, Roulet, Esteban, Rovero, Adrian, Saffi, Steven J., Saftoiu, Alexandra, Salazar, Humberto, Saleh, Ahmed, Greus, Francisco Salesa, Salina, Gaetano, Gomez, Jose Sanabria, Sánchez, Federico, Sanchez-Lucas, Patricia, Santos, Edivaldo Moura, Santos, Eva, Sarazin, Fred, Sarkar, Biswaijt, Sarmento, Raul, Sarmiento-Cano, Christian, Sato, Ricardo, Scarso, Carlos, Schauer, Markus, Scherini, Viviana, Schieler, Harald, Schmidt, David, Scholten, Olaf, Schoorlemmer, Harm, Schovánek, Petr, Schröder, Frank G., Schulz, Alexander, Schulz, Johannes, Schumacher, Johannes, Sciutto, Sergio, Segreto, Alberto, Settimo, Mariangela, Shadkam, Amir, Shellard, Ronald C., Sigl, Guenter, Sima, Octavian, Śmiałkowski, Andrzej, Šmída, Radomir, Snow, Gregory, Sommers, Paul, Sonntag, Sebastian, Sorokin, J., Squartini, Ruben, Srivastava, Yogendra N., Stanca, Denis, Stanič, Samo, Stapleton, James, Stasielak, Jaroslaw, Stephan, Maurice, Stutz, Anne, Suarez, Federico, Durán, Mauricio Suarez, Suomijärvi, Tiina, Supanitsky, A. Daniel, Sutherland, Michael, Swain, John, Szadkowski, Zbigniew, Taborda, Oscar Alejandro, Tapia, Alex, Tepe, Andreas, Theodoro, Vanessa Menezes, Timmermans, Charles, Peixoto, Carlos J. Todero, Toma, Gabriel, Tomankova, Lenka, Tomé, Bernardo, Tonachini, Aurelio, Elipe, Guillermo Torralba, Machado, Diego Torres, Travnicek, Petr, Trini, Marta, Ulrich, Ralf, Unger, Michael, Urban, Martin, Galicia, Jose F. Valdés, Valiño, Ines, Valore, Laura, van Aar, Guus, van Bodegom, Patrick, Berg, Ad M. van den, van Velzen, Sjoert, van Vliet, Arjen, Varela, Enrique, Cárdenas, Bernardo Vargas, Varner, Gary, Vasquez, Rafael, Vázquez, Jose R., Vázquez, Ricardo, Veberič, Darko, Verzi, Valerio, Vicha, Jakub, Videla, Mariela, Villaseñor, Luis, Vlcek, Brian, Vorobiov, Serguei, Wahlberg, Hernan, Wainberg, Oscar, Walz, David, Watson, Alan, Weber, Marc, Weidenhaupt, Klaus, Weindl, Andreas, Welling, Christoph, Werner, Felix, Widom, Allan, Wiencke, Lawrence, Wilczyński, Henryk, Winchen, Tobias, Wittkowski, David, Wundheiler, Brian, Wykes, Sarka, Yang, Lili, Yapici, Tolga, Yushkov, Alexey, Zas, Enrique, Zavrtanik, Danilo, Zavrtanik, Marko, Zepeda, Arnulfo, Zimmermann, Benedikt, Ziolkowski, Michael, and Zuccarello, Francesca
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment
Abstract: We measure the energy emitted by extensive air showers in the form of radio emission in the frequency range from 30 to 80 MHz. Exploiting the accurate energy scale of the Pierre Auger Observatory, we obtain a radiation energy of 15.8 \pm 0.7 (stat) \pm 6.7 (sys) MeV for cosmic rays with an energy of 1 EeV arriving perpendicularly to a geomagnetic field of 0.24 G, scaling quadratically with the cosmic-ray energy. A comparison with predictions from state-of-the-art first-principle calculations shows agreement with our measurement. The radiation energy provides direct access to the calorimetric energy in the electromagnetic cascade of extensive air showers. Comparison with our result thus allows the direct calibration of any cosmic-ray radio detector against the well-established energy scale of the Pierre Auger Observatory., Comment: Replaced with published version. Added journal reference and DOI. Supplemental material in the ancillary files
Published: 2016
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18. Transition radiation at radio frequencies from ultra-high energy neutrino-induced showers

Author: Motloch, Pavel, Alvarez-Muñiz, Jaime, Privitera, Paolo, and Zas, Enrique
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Phenomenology
Abstract: Coherent radiation at radio frequencies from high-energy showers fully contained in a dense radio-transparent medium - like ice, salt or regolith - has been extensively investigated as a promising technique to search for ultra-high energy (UHE) neutrinos. Additional emission in the form of transition radiation may occur when a neutrino-induced shower produced close to the Earth surface emerges from the ground into atmospheric air. We present the first detailed evaluation of transition radiation from high-energy showers crossing the boundary between two different media. We found that transition radiation is sizable over a wide solid angle and coherent up to $\sim$ 1 GHz. These properties encourage further work to evaluate the potential of a large-aperture UHE neutrino experiment based on detection of transition radiation., Comment: 13 pages, 14 figures, matches PRD accepted version, typo for the emission strength for EeV showers corrected
Published: 2015
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19. Energy Estimation of Cosmic Rays with the Engineering Radio Array of the Pierre Auger Observatory

Author: The Pierre Auger Collaboration, Aab, Alexander, Abreu, Pedro, Aglietta, Marco, Ahn, Eun-Joo, Samarai, Imen Al, Albuquerque, Ivone, Allekotte, Ingomar, Allison, Patrick, Almela, Alejandro, Castillo, Jesus Alvarez, Alvarez-Muñiz, Jaime, Batista, Rafael Alves, Ambrosio, Michelangelo, Aminaei, Amin, Anastasi, Gioacchino Alex, Anchordoqui, Luis, Andringa, Sofia, Aramo, Carla, Arqueros, Fernando, Arsene, Nicusor, Asorey, Hernán Gonzalo, Assis, Pedro, Aublin, Julien, Avila, Gualberto, Awal, Nafiun, Badescu, Alina Mihaela, Baus, Colin, Beatty, Jim, Becker, Karl Heinz, Bellido, Jose A., Berat, Corinne, Bertaina, Mario Edoardo, Bertou, Xavier, Biermann, Peter, Billoir, Pierre, Blaess, Simon G., Blanco, Alberto, Blanco, Miguel, Blazek, Jiri, Bleve, Carla, Blümer, Hans, Boháčová, Martina, Boncioli, Denise, Bonifazi, Carla, Borodai, Nataliia, Brack, Jeffrey, Brancus, Iliana, Bretz, Thomas, Bridgeman, Ariel, Brogueira, Pedro, Buchholz, Peter, Bueno, Antonio, Buitink, Stijn, Buscemi, Mario, Caballero-Mora, Karen S., Caccianiga, Barbara, Caccianiga, Lorenzo, Candusso, Marina, Caramete, Laurentiu, Caruso, Rossella, Castellina, Antonella, Cataldi, Gabriella, Cazon, Lorenzo, Cester, Rosanna, Chavez, Alan G., Chiavassa, Andrea, Chinellato, Jose Augusto, Chudoba, Jiri, Cilmo, Marco, Clay, Roger W, Cocciolo, Giuseppe, Colalillo, Roberta, Coleman, Alan, Collica, Laura, Coluccia, Maria Rita, Conceição, Ruben, Contreras, Fernando, Cooper, Mathew J., Cordier, Alain, Coutu, Stephane, Covault, Corbin, Cronin, James, Dallier, Richard, Daniel, Bruno, Dasso, Sergio, Daumiller, Kai, Dawson, Bruce R., de Almeida, Rogerio M., de Jong, Sijbrand J., De Mauro, Giuseppe, Neto, Joao de Mello, De Mitri, Ivan, de Oliveira, Jaime, de Souza, Vitor, del Peral, Luis, Deligny, Olivier, Dhital, Niraj, Di Giulio, Claudio, Di Matteo, Armando, Diaz, Johana Chirinos, Castro, Mary Lucia Díaz, Diogo, Francisco, Dobrigkeit, Carola, Docters, Wendy, D'Olivo, Juan Carlos, Dorofeev, Alexei, Hasankiadeh, Qader Dorosti, Anjos, Rita dos, Dova, Maria Teresa, Ebr, Jan, Engel, Ralph, Erdmann, Martin, Erfani, Mona, Escobar, Carlos O., Espadanal, Joao, Etchegoyen, Alberto, Falcke, Heino, Fang, Ke, Farrar, Glennys, Fauth, Anderson, Fazzini, Norberto, Ferguson, Andrew P., Fick, Brian, Figueira, Juan Manuel, Filevich, Alberto, Filipčič, Andrej, Fratu, Octavian, Freire, Martín Miguel, Fujii, Toshihiro, García, Beatriz, Garcia-Gamez, Diego, Garcia-Pinto, Diego, Gate, Florian, Gemmeke, Hartmut, Gherghel-Lascu, Alexandru, Ghia, Piera Luisa, Giaccari, Ugo, Giammarchi, Marco, Giller, Maria, Głas, Dariusz, Glaser, Christian, Glass, Henry, Golup, Geraldina, Berisso, Mariano Gómez, Vitale, Primo F. Gómez, González, Nicolás, Gookin, Ben, Gordon, Jacob, Gorgi, Alessio, Gorham, Peter, Gouffon, Philippe, Griffith, Nathan, Grillo, Aurelio, Grubb, Trent D., Guarino, Fausto, Guedes, Germano, Hampel, Matías Rolf, Hansen, Patricia, Harari, Diego, Harrison, Thomas A., Hartmann, Sebastian, Harton, John, Haungs, Andreas, Hebbeker, Thomas, Heck, Dieter, Heimann, Philipp, Herve, Alexander E., Hill, Gary C., Hojvat, Carlos, Hollon, Nicholas, Holt, Ewa, Homola, Piotr, Hörandel, Jörg, Horvath, Pavel, Hrabovský, Miroslav, Huber, Daniel, Huege, Tim, Insolia, Antonio, Isar, Paula Gina, Jandt, Ingolf, Jansen, Stefan, Jarne, Cecilia, Johnsen, Jeffrey A., Josebachuili, Mariela, Kääpä, Alex, Kambeitz, Olga, Kampert, Karl Heinz, Kasper, Peter, Katkov, Igor, Keilhauer, Bianca, Kemp, Ernesto, Kieckhafer, Roger, Klages, Hans, Kleifges, Matthias, Kleinfeller, Jonny, Krause, Raphael, Krohm, Nicole, Kuempel, Daniel, Mezek, Gasper Kukec, Kunka, Norbert, Awad, Alaa Metwaly Kuotb, LaHurd, Danielle, Latronico, Luca, Lauer, Robert, Lauscher, Markus, Lautridou, Pascal, Coz, Sandra Le, Lebrun, Didier, Lebrun, Paul, de Oliveira, Marcelo Augusto Leigui, Letessier-Selvon, Antoine, Lhenry-Yvon, Isabelle, Link, Katrin, Lopes, Luis, López, Rebeca, Casado, Aida López, Louedec, Karim, Lucero, Agustin, Malacari, Max, Mallamaci, Manuela, Maller, Jennifer, Mandat, Dusan, Mantsch, Paul, Mariazzi, Analisa, Marin, Vincent, Mariş, Ioana, Marsella, Giovanni, Martello, Daniele, Martinez, Humberto, Bravo, Oscar Martínez, Martraire, Diane, Meza, Jimmy Masías, Mathes, Hermann-Josef, Mathys, Sebastian, Matthews, James, Matthews, John, Matthiae, Giorgio, Maurizio, Daniela, Mayotte, Eric, Mazur, Peter, Medina, Carlos, Medina-Tanco, Gustavo, Meissner, Rebecca, Mello, Victor, Melo, Diego, Menshikov, Alexander, Messina, Stefano, Micheletti, Maria Isabel, Middendorf, Lukas, Minaya, Ignacio A., Miramonti, Lino, Mitrica, Bogdan, Molina-Bueno, Laura, Mollerach, Silvia, Montanet, François, Morello, Carlo, Mostafá, Miguel, Moura, Celio A., Muller, Marcio Aparecido, Müller, Gero, Müller, Sarah, Navas, Sergio, Necesal, Petr, Nellen, Lukas, Nelles, Anna, Neuser, Jens, Nguyen, Phong H., Niculescu-Oglinzanu, Mihai, Niechciol, Marcus, Niemietz, Lukas, Niggemann, Tim, Nitz, Dave, Nosek, Dalibor, Novotny, Vladimir, Nožka, Lyberis, Núñez, Luis, Ochilo, Livingstone, Oikonomou, Foteini, Olinto, Angela, Pacheco, Noelia, Selmi-Dei, Daniel Pakk, Palatka, Miroslav, Pallotta, Juan, Papenbreer, Philipp, Parente, Gonzalo, Parra, Alejandra, Paul, Thomas, Pech, Miroslav, Pękala, Jan, Pelayo, Rodrigo, Pepe, Iuri, Perrone, Lorenzo, Petermann, Emily, Peters, Christine, Petrera, Sergio, Petrov, Yevgeniy, Phuntsok, Jamyang, Piegaia, Ricardo, Pierog, Tanguy, Pieroni, Pablo, Pimenta, Mário, Pirronello, Valerio, Platino, Manuel, Plum, Matthias, Porcelli, Alessio, Porowski, Czeslaw, Prado, Raul Ribeiro, Privitera, Paolo, Prouza, Michael, Quel, Eduardo J, Querchfeld, Sven, Quinn, Sean, Rautenberg, Julian, Ravel, Olivier, Ravignani, Diego, Reinert, Darius, Revenu, Benoît, Ridky, Jan, Risse, Markus, Ristori, Pablo, Rizi, Vincenzo, de Carvalho, Washington Rodrigues, Rojo, Jorge Rubén Rodriguez, Rodríguez-Frías, Maria Dolores, Rogozin, Dmytro, Rosado, Jaime, Roth, Markus, Roulet, Esteban, Rovero, Adrian, Saffi, Steven J., Saftoiu, Alexandra, Salazar, Humberto, Saleh, Ahmed, Greus, Francisco Salesa, Salina, Gaetano, Gomez, Jose Sanabria, Sánchez, Federico, Sanchez-Lucas, Patricia, Santos, Edivaldo Moura, Santos, Eva, Sarazin, Fred, Sarkar, Biswaijt, Sarmento, Raul, Sarmiento-Cano, Christian, Sato, Ricardo, Scarso, Carlos, Schauer, Markus, Scherini, Viviana, Schieler, Harald, Schmidt, David, Scholten, Olaf, Schoorlemmer, Harm, Schovánek, Petr, Schröder, Frank G., Schulz, Alexander, Schulz, Johannes, Schumacher, Johannes, Sciutto, Sergio, Segreto, Alberto, Settimo, Mariangela, Shadkam, Amir, Shellard, Ronald C., Sigl, Guenter, Sima, Octavian, Śmiałkowski, Andrzej, Šmída, Radomir, Snow, Gregory, Sommers, Paul, Sonntag, Sebastian, Sorokin, J., Squartini, Ruben, Srivastava, Yogendra N., Stanca, Denis, Stanič, Samo, Stapleton, James, Stasielak, Jaroslaw, Stephan, Maurice, Stutz, Anne, Suarez, Federico, Durán, Mauricio Suarez, Suomijärvi, Tiina, Supanitsky, A. Daniel, Sutherland, Michael, Swain, John, Szadkowski, Zbigniew, Taborda, Oscar Alejandro, Tapia, Alex, Tepe, Andreas, Theodoro, Vanessa Menezes, Tibolla, Omar, Timmermans, Charles, Peixoto, Carlos J. Todero, Toma, Gabriel, Tomankova, Lenka, Tomé, Bernardo, Tonachini, Aurelio, Elipe, Guillermo Torralba, Machado, Diego Torres, Travnicek, Petr, Trini, Marta, Ulrich, Ralf, Unger, Michael, Urban, Martin, Galicia, Jose F. Valdés, Valiño, Ines, Valore, Laura, van Aar, Guus, van Bodegom, Patrick, Berg, Ad M. van den, van Velzen, Sjoert, van Vliet, Arjen, Varela, Enrique, Cárdenas, Bernardo Vargas, Varner, Gary, Vasquez, Rafael, Vázquez, Jose R., Vázquez, Ricardo, Veberič, Darko, Verzi, Valerio, Vicha, Jakub, Videla, Mariela, Villaseñor, Luis, Vlcek, Brian, Vorobiov, Serguei, Wahlberg, Hernan, Wainberg, Oscar, Walz, David, Watson, Alan, Weber, Marc, Weidenhaupt, Klaus, Weindl, Andreas, Welling, Christoph, Werner, Felix, Widom, Allan, Wiencke, Lawrence, Wilczyński, Henryk, Winchen, Tobias, Wittkowski, David, Wundheiler, Brian, Wykes, Sarka, Yang, Lili, Yapici, Tolga, Yushkov, Alexey, Zas, Enrique, Zavrtanik, Danilo, Zavrtanik, Marko, Zepeda, Arnulfo, Zimmermann, Benedikt, Ziolkowski, Michael, and Zuccarello, Francesca
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: The Auger Engineering Radio Array (AERA) is part of the Pierre Auger Observatory and is used to detect the radio emission of cosmic-ray air showers. These observations are compared to the data of the surface detector stations of the Observatory, which provide well-calibrated information on the cosmic-ray energies and arrival directions. The response of the radio stations in the 30 to 80 MHz regime has been thoroughly calibrated to enable the reconstruction of the incoming electric field. For the latter, the energy deposit per area is determined from the radio pulses at each observer position and is interpolated using a two-dimensional function that takes into account signal asymmetries due to interference between the geomagnetic and charge-excess emission components. The spatial integral over the signal distribution gives a direct measurement of the energy transferred from the primary cosmic ray into radio emission in the AERA frequency range. We measure 15.8 MeV of radiation energy for a 1 EeV air shower arriving perpendicularly to the geomagnetic field. This radiation energy -- corrected for geometrical effects -- is used as a cosmic-ray energy estimator. Performing an absolute energy calibration against the surface-detector information, we observe that this radio-energy estimator scales quadratically with the cosmic-ray energy as expected for coherent emission. We find an energy resolution of the radio reconstruction of 22% for the data set and 17% for a high-quality subset containing only events with at least five radio stations with signal., Comment: Replaced with published version. Added journal reference and DOI
Published: 2015
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20. An improved limit to the diffuse flux of ultra-high energy neutrinos from the Pierre Auger Observatory

Author: The Pierre Auger Collaboration, Aab, Alexander, Abreu, Pedro, Aglietta, Marco, Ahn, Eun-Joo, Samarai, Imen Al, Albuquerque, Ivone, Allekotte, Ingomar, Allison, Patrick, Almela, Alejandro, Castillo, Jesus Alvarez, Alvarez-Muñiz, Jaime, Batista, Rafael Alves, Ambrosio, Michelangelo, Aminaei, Amin, Anchordoqui, Luis, Andringa, Sofia, Aramo, Carla, Aranda, Victor Manuel, Arqueros, Fernando, Arsene, Nicusor, Asorey, Hernán Gonzalo, Assis, Pedro, Aublin, Julien, Ave, Maximo, Avenier, Michel, Avila, Gualberto, Awal, Nafiun, Badescu, Alina Mihaela, Barber, Kerri B, Bäuml, Julia, Baus, Colin, Beatty, Jim, Becker, Karl Heinz, Bellido, Jose A, Berat, Corinne, Bertaina, Mario Edoardo, Bertou, Xavier, Biermann, Peter, Billoir, Pierre, Blaess, Simon G, Blanco, Alberto, Blanco, Miguel, Bleve, Carla, Blümer, Hans, Boháčová, Martina, Boncioli, Denise, Bonifazi, Carla, Borodai, Nataliia, Brack, Jeffrey, Brancus, Iliana, Bridgeman, Ariel, Brogueira, Pedro, Brown, William C, Buchholz, Peter, Bueno, Antonio, Buitink, Stijn, Buscemi, Mario, Caballero-Mora, Karen S, Caccianiga, Barbara, Caccianiga, Lorenzo, Candusso, Marina, Caramete, Laurentiu, Caruso, Rossella, Castellina, Antonella, Cataldi, Gabriella, Cazon, Lorenzo, Cester, Rosanna, Chavez, Alan G, Chiavassa, Andrea, Chinellato, Jose Augusto, Chudoba, Jiri, Cilmo, Marco, Clay, Roger W, Cocciolo, Giuseppe, Colalillo, Roberta, Coleman, Alan, Collica, Laura, Coluccia, Maria Rita, Conceição, Ruben, Contreras, Fernando, Cooper, Mathew J, Cordier, Alain, Coutu, Stephane, Covault, Corbin, Cronin, James, Dallier, Richard, Daniel, Bruno, Dasso, Sergio, Daumiller, Kai, Dawson, Bruce R, de Almeida, Rogerio M, de Jong, Sijbrand J, De Mauro, Giuseppe, Neto, Joao de Mello, De Mitri, Ivan, de Oliveira, Jaime, de Souza, Vitor, del Peral, Luis, Deligny, Olivier, Dembinski, Hans, Dhital, Niraj, Di Giulio, Claudio, Di Matteo, Armando, Diaz, Johana Chirinos, Castro, Mary Lucia Díaz, Diogo, Francisco, Dobrigkeit, Carola, Docters, Wendy, D'Olivo, Juan Carlos, Dorofeev, Alexei, Hasankiadeh, Qader Dorosti, Dova, Maria Teresa, Ebr, Jan, Engel, Ralph, Erdmann, Martin, Erfani, Mona, Escobar, Carlos O, Espadanal, Joao, Etchegoyen, Alberto, Falcke, Heino, Fang, Ke, Farrar, Glennys, Fauth, Anderson, Fazzini, Norberto, Ferguson, Andrew P, Fernandes, Mateus, Fick, Brian, Figueira, Juan Manuel, Filevich, Alberto, Filipčič, Andrej, Fox, Brendan, Fratu, Octavian, Freire, Martín Miguel, Fuchs, Benjamin, Fujii, Toshihiro, García, Beatriz, Garcia-Pinto, Diego, Gate, Florian, Gemmeke, Hartmut, Gherghel-Lascu, Alexandru, Ghia, Piera Luisa, Giaccari, Ugo, Giammarchi, Marco, Giller, Maria, Głas, Dariusz, Glaser, Christian, Glass, Henry, Golup, Geraldina, Berisso, Mariano Gómez, Vitale, Primo F Gómez, González, Nicolás, Gookin, Ben, Gordon, Jacob, Gorgi, Alessio, Gorham, Peter, Gouffon, Philippe, Griffith, Nathan, Grillo, Aurelio, Grubb, Trent D, Guardincerri, Yann, Guarino, Fausto, Guedes, Germano, Hampel, Matías Rolf, Hansen, Patricia, Harari, Diego, Harrison, Thomas A, Hartmann, Sebastian, Harton, John, Haungs, Andreas, Hebbeker, Thomas, Heck, Dieter, Heimann, Philipp, Herve, Alexander E, Hill, Gary C, Hojvat, Carlos, Hollon, Nicholas, Holt, Ewa, Homola, Piotr, Hörandel, Jörg, Horvath, Pavel, Hrabovský, Miroslav, Huber, Daniel, Huege, Tim, Insolia, Antonio, Isar, Paula Gina, Jandt, Ingolf, Jansen, Stefan, Jarne, Cecilia, Johnsen, Jeffrey A, Josebachuili, Mariela, Kääpä, Alex, Kambeitz, Olga, Kampert, Karl Heinz, Kasper, Peter, Katkov, Igor, Kégl, Balazs, Keilhauer, Bianca, Keivani, Azadeh, Kemp, Ernesto, Kieckhafer, Roger, Klages, Hans, Kleifges, Matthias, Kleinfeller, Jonny, Krause, Raphael, Krohm, Nicole, Krömer, Oliver, Kuempel, Daniel, Kunka, Norbert, LaHurd, Danielle, Latronico, Luca, Lauer, Robert, Lauscher, Markus, Lautridou, Pascal, Coz, Sandra Le, Lebrun, Didier, Lebrun, Paul, de Oliveira, Marcelo Augusto Leigui, Letessier-Selvon, Antoine, Lhenry-Yvon, Isabelle, Link, Katrin, Lopes, Luis, López, Rebeca, Casado, Aida López, Louedec, Karim, Lu, Lu, Lucero, Agustin, Malacari, Max, Maldera, Simone, Mallamaci, Manuela, Maller, Jennifer, Mandat, Dusan, Mantsch, Paul, Mariazzi, Analisa, Marin, Vincent, Mariş, Ioana, Marsella, Giovanni, Martello, Daniele, Martin, Lilian, Martinez, Humberto, Bravo, Oscar Martínez, Martraire, Diane, Meza, Jimmy Masías, Mathes, Hermann-Josef, Mathys, Sebastian, Matthews, James, Matthews, John, Matthiae, Giorgio, Maurel, Detlef, Maurizio, Daniela, Mayotte, Eric, Mazur, Peter, Medina, Carlos, Medina-Tanco, Gustavo, Meissner, Rebecca, Mello, Victor, Melo, Diego, Menshikov, Alexander, Messina, Stefano, Meyhandan, Rishi, Micheletti, Maria Isabel, Middendorf, Lukas, Minaya, Ignacio A, Miramonti, Lino, Mitrica, Bogdan, Molina-Bueno, Laura, Mollerach, Silvia, Montanet, François, Morello, Carlo, Mostafá, Miguel, Moura, Celio A, Muller, Marcio Aparecido, Müller, Gero, Müller, Sarah, Mussa, Roberto, Navarra, Gianni, Navarro, Jose Luis, Navas, Sergio, Necesal, Petr, Nellen, Lukas, Nelles, Anna, Neuser, Jens, Nguyen, Phong H, Niculescu-Oglinzanu, Mihai, Niechciol, Marcus, Niemietz, Lukas, Niggemann, Tim, Nitz, Dave, Nosek, Dalibor, Novotny, Vladimir, Nožka, Lyberis, Ochilo, Livingstone, Oikonomou, Foteini, Olinto, Angela, Pacheco, Noelia, Selmi-Dei, Daniel Pakk, Palatka, Miroslav, Pallotta, Juan, Papenbreer, Philipp, Parente, Gonzalo, Parra, Alejandra, Paul, Thomas, Pech, Miroslav, Pękala, Jan, Pelayo, Rodrigo, Pepe, Iuri, Perrone, Lorenzo, Petermann, Emily, Peters, Christine, Petrera, Sergio, Petrov, Yevgeniy, Phuntsok, Jamyang, Piegaia, Ricardo, Pierog, Tanguy, Pieroni, Pablo, Pimenta, Mário, Pirronello, Valerio, Platino, Manuel, Plum, Matthias, Porcelli, Alessio, Porowski, Czeslaw, Prado, Raul Ribeiro, Privitera, Paolo, Prouza, Michael, Purrello, Victor, Quel, Eduardo J, Querchfeld, Sven, Quinn, Sean, Rautenberg, Julian, Ravel, Olivier, Ravignani, Diego, Revenu, Benoît, Ridky, Jan, Riggi, Simone, Risse, Markus, Ristori, Pablo, Rizi, Vincenzo, de Carvalho, Washington Rodrigues, Fernandez, Gonzalo Rodriguez, Rojo, Jorge Rubén Rodriguez, Rodríguez-Frías, Maria Dolores, Rogozin, Dmytro, Rosado, Jaime, Roth, Markus, Roulet, Esteban, Rovero, Adrian, Saffi, Steven J, Saftoiu, Alexandra, Salamida, Francesco, Salazar, Humberto, Saleh, Ahmed, Greus, Francisco Salesa, Salina, Gaetano, Sánchez, Federico, Sanchez-Lucas, Patricia, Santos, Edivaldo Moura, Santos, Eva, Sarazin, Fred, Sarkar, Biswaijt, Sarmento, Raul, Sato, Ricardo, Scarso, Carlos, Schauer, Markus, Scherini, Viviana, Schieler, Harald, Schiffer, Peter, Schmidt, David, Scholten, Olaf, Schoorlemmer, Harm, Schovánek, Petr, Schröder, Frank G, Schulz, Alexander, Schulz, Johannes, Schumacher, Johannes, Sciutto, Sergio, Segreto, Alberto, Settimo, Mariangela, Shadkam, Amir, Shellard, Ronald C, Sidelnik, Iván, Sigl, Guenter, Sima, Octavian, Śmiałkowski, Andrzej, Šmída, Radomir, Snow, Gregory, Sommers, Paul, Sorokin, J, Squartini, Ruben, Srivastava, Yogendra N, Stanca, Denis, Stanič, Samo, Stapleton, James, Stasielak, Jaroslaw, Stephan, Maurice, Stutz, Anne, Suarez, Federico, Suomijärvi, Tiina, Supanitsky, A Daniel, Sutherland, Michael, Swain, John, Szadkowski, Zbigniew, Taborda, Oscar Alejandro, Tapia, Alex, Tepe, Andreas, Theodoro, Vanessa Menezes, Tiffenberg, Javier, Timmermans, Charles, Peixoto, Carlos J Todero, Toma, Gabriel, Tomankova, Lenka, Tomé, Bernardo, Tonachini, Aurelio, Elipe, Guillermo Torralba, Machado, Diego Torres, Travnicek, Petr, Ulrich, Ralf, Unger, Michael, Urban, Martin, Galicia, Jose F Valdés, Valiño, Ines, Valore, Laura, van Aar, Guus, van Bodegom, Patrick, Berg, Ad M van den, van Velzen, Sjoert, van Vliet, Arjen, Varela, Enrique, Cárdenas, Bernardo Vargas, Varner, Gary, Vasquez, Rafael, Vázquez, Jose R, Vázquez, Ricardo, Veberič, Darko, Verzi, Valerio, Vicha, Jakub, Videla, Mariela, Villaseñor, Luis, Vlcek, Brian, Vorobiov, Serguei, Wahlberg, Hernan, Wainberg, Oscar, Walz, David, Watson, Alan, Weber, Marc, Weidenhaupt, Klaus, Weindl, Andreas, Werner, Felix, Widom, Allan, Wiencke, Lawrence, Wilczyński, Henryk, Winchen, Tobias, Wittkowski, David, Wundheiler, Brian, Wykes, Sarka, Yang, Lili, Yapici, Tolga, Yushkov, Alexey, Zas, Enrique, Zavrtanik, Danilo, Zavrtanik, Marko, Zepeda, Arnulfo, Zhu, Yue, Zimmermann, Benedikt, Ziolkowski, Michael, and Zuccarello, Francesca
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: Neutrinos in the cosmic ray flux with energies near 1 EeV and above are detectable with the Surface Detector array of the Pierre Auger Observatory. We report here on searches through Auger data from 1 January 2004 until 20 June 2013. No neutrino candidates were found, yielding a limit to the diffuse flux of ultra-high energy neutrinos that challenges the Waxman-Bahcall bound predictions. Neutrino identification is attempted using the broad time-structure of the signals expected in the SD stations, and is efficiently done for neutrinos of all flavors interacting in the atmosphere at large zenith angles, as well as for "Earth-skimming" neutrino interactions in the case of tau neutrinos. In this paper the searches for downward-going neutrinos in the zenith angle bins $60^\circ-75^\circ$ and $75^\circ-90^\circ$ as well as for upward-going neutrinos, are combined to give a single limit. The $90\%$ C.L. single-flavor limit to the diffuse flux of ultra-high energy neutrinos with an $E^{-2}$ spectrum in the energy range $1.0 \times 10^{17}$ eV - $2.5 \times 10^{19}$ eV is $E_\nu^2 dN_\nu/dE_\nu < 6.4 \times 10^{-9}~ {\rm GeV~ cm^{-2}~ s^{-1}~ sr^{-1}}$., Comment: Replaced with published version. Added journal reference and DOI
Published: 2015
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21. Measurement of the cosmic ray spectrum above $4{\times}10^{18}$ eV using inclined events detected with the Pierre Auger Observatory

Author: The Pierre Auger Collaboration, Aab, Alexander, Abreu, Pedro, Aglietta, Marco, Ahn, Eun-Joo, Samarai, Imen Al, Albuquerque, Ivone, Allekotte, Ingomar, Allison, Patrick, Almela, Alejandro, Castillo, Jesus Alvarez, Alvarez-Muñiz, Jaime, Batista, Rafael Alves, Ambrosio, Michelangelo, Aminaei, Amin, Anchordoqui, Luis, Andringa, Sofia, Aramo, Carla, Aranda, Victor Manuel, Arqueros, Fernando, Arsene, Nicusor, Asorey, Hernán Gonzalo, Assis, Pedro, Aublin, Julien, Ave, Maximo, Avenier, Michel, Avila, Gualberto, Awal, Nafiun, Badescu, Alina Mihaela, Barber, Kerri B, Bäuml, Julia, Baus, Colin, Beatty, Jim, Becker, Karl Heinz, Bellido, Jose A, Berat, Corinne, Bertaina, Mario Edoardo, Bertou, Xavier, Biermann, Peter, Billoir, Pierre, Blaess, Simon G, Blanco, Alberto, Blanco, Miguel, Bleve, Carla, Blümer, Hans, Boháčová, Martina, Boncioli, Denise, Bonifazi, Carla, Borodai, Nataliia, Brack, Jeffrey, Brancus, Iliana, Bridgeman, Ariel, Brogueira, Pedro, Brown, William C, Buchholz, Peter, Bueno, Antonio, Buitink, Stijn, Buscemi, Mario, Caballero-Mora, Karen S, Caccianiga, Barbara, Caccianiga, Lorenzo, Candusso, Marina, Caramete, Laurentiu, Caruso, Rossella, Castellina, Antonella, Cataldi, Gabriella, Cazon, Lorenzo, Cester, Rosanna, Chavez, Alan G, Chiavassa, Andrea, Chinellato, Jose Augusto, Chudoba, Jiri, Cilmo, Marco, Clay, Roger W, Cocciolo, Giuseppe, Colalillo, Roberta, Coleman, Alan, Collica, Laura, Coluccia, Maria Rita, Conceição, Ruben, Contreras, Fernando, Cooper, Mathew J, Cordier, Alain, Coutu, Stephane, Covault, Corbin, Cronin, James, Dallier, Richard, Daniel, Bruno, Dasso, Sergio, Daumiller, Kai, Dawson, Bruce R, de Almeida, Rogerio M, de Jong, Sijbrand J, De Mauro, Giuseppe, Neto, Joao de Mello, De Mitri, Ivan, de Oliveira, Jaime, de Souza, Vitor, del Peral, Luis, Deligny, Olivier, Dembinski, Hans, Dhital, Niraj, Di Giulio, Claudio, Di Matteo, Armando, Diaz, Johana Chirinos, Castro, Mary Lucia Díaz, Diogo, Francisco, Dobrigkeit, Carola, Docters, Wendy, D'Olivo, Juan Carlos, Dorofeev, Alexei, Hasankiadeh, Qader Dorosti, Dova, Maria Teresa, Ebr, Jan, Engel, Ralph, Erdmann, Martin, Erfani, Mona, Escobar, Carlos O, Espadanal, Joao, Etchegoyen, Alberto, Falcke, Heino, Fang, Ke, Farrar, Glennys, Fauth, Anderson, Fazzini, Norberto, Ferguson, Andrew P, Fernandes, Mateus, Fick, Brian, Figueira, Juan Manuel, Filevich, Alberto, Filipčič, Andrej, Fox, Brendan, Fratu, Octavian, Freire, Martín Miguel, Fuchs, Benjamin, Fujii, Toshihiro, García, Beatriz, Garcia-Pinto, Diego, Gate, Florian, Gemmeke, Hartmut, Gherghel-Lascu, Alexandru, Ghia, Piera Luisa, Giaccari, Ugo, Giammarchi, Marco, Giller, Maria, Głas, Dariusz, Glaser, Christian, Glass, Henry, Golup, Geraldina, Berisso, Mariano Gómez, Vitale, Primo F Gómez, González, Nicolás, Gookin, Ben, Gordon, Jacob, Gorgi, Alessio, Gorham, Peter, Gouffon, Philippe, Griffith, Nathan, Grillo, Aurelio, Grubb, Trent D, Guarino, Fausto, Guedes, Germano, Hampel, Matías Rolf, Hansen, Patricia, Harari, Diego, Harrison, Thomas A, Hartmann, Sebastian, Harton, John, Haungs, Andreas, Hebbeker, Thomas, Heck, Dieter, Heimann, Philipp, Herve, Alexander E, Hill, Gary C, Hojvat, Carlos, Hollon, Nicholas, Holt, Ewa, Homola, Piotr, Hörandel, Jörg, Horvath, Pavel, Hrabovský, Miroslav, Huber, Daniel, Huege, Tim, Insolia, Antonio, Isar, Paula Gina, Jandt, Ingolf, Jansen, Stefan, Jarne, Cecilia, Johnsen, Jeffrey A, Josebachuili, Mariela, Kääpä, Alex, Kambeitz, Olga, Kampert, Karl Heinz, Kasper, Peter, Katkov, Igor, Kégl, Balazs, Keilhauer, Bianca, Keivani, Azadeh, Kemp, Ernesto, Kieckhafer, Roger, Klages, Hans, Kleifges, Matthias, Kleinfeller, Jonny, Krause, Raphael, Krohm, Nicole, Krömer, Oliver, Kuempel, Daniel, Kunka, Norbert, LaHurd, Danielle, Latronico, Luca, Lauer, Robert, Lauscher, Markus, Lautridou, Pascal, Coz, Sandra Le, Lebrun, Didier, Lebrun, Paul, de Oliveira, Marcelo Augusto Leigui, Letessier-Selvon, Antoine, Lhenry-Yvon, Isabelle, Link, Katrin, Lopes, Luis, López, Rebeca, Casado, Aida López, Louedec, Karim, Lu, Lu, Lucero, Agustin, Malacari, Max, Maldera, Simone, Mallamaci, Manuela, Maller, Jennifer, Mandat, Dusan, Mantsch, Paul, Mariazzi, Analisa, Marin, Vincent, Mariş, Ioana, Marsella, Giovanni, Martello, Daniele, Martin, Lilian, Martinez, Humberto, Bravo, Oscar Martínez, Martraire, Diane, Meza, Jimmy Masías, Mathes, Hermann-Josef, Mathys, Sebastian, Matthews, James, Matthews, John, Matthiae, Giorgio, Maurel, Detlef, Maurizio, Daniela, Mayotte, Eric, Mazur, Peter, Medina, Carlos, Medina-Tanco, Gustavo, Meissner, Rebecca, Mello, Victor, Melo, Diego, Menshikov, Alexander, Messina, Stefano, Meyhandan, Rishi, Micheletti, Maria Isabel, Middendorf, Lukas, Minaya, Ignacio A, Miramonti, Lino, Mitrica, Bogdan, Molina-Bueno, Laura, Mollerach, Silvia, Montanet, François, Morello, Carlo, Mostafá, Miguel, Moura, Celio A, Muller, Marcio Aparecido, Müller, Gero, Müller, Sarah, Mussa, Roberto, Navarra, Gianni, Navas, Sergio, Necesal, Petr, Nellen, Lukas, Nelles, Anna, Neuser, Jens, Newton, David, Nguyen, Phong H, Niculescu-Oglinzanu, Mihai, Niechciol, Marcus, Niemietz, Lukas, Niggemann, Tim, Nitz, Dave, Nosek, Dalibor, Novotny, Vladimir, Nožka, Lyberis, Ochilo, Livingstone, Oikonomou, Foteini, Olinto, Angela, Olmos-Gilbaja, Victor, Pacheco, Noelia, Selmi-Dei, Daniel Pakk, Palatka, Miroslav, Pallotta, Juan, Papenbreer, Philipp, Parente, Gonzalo, Parra, Alejandra, Paul, Thomas, Pech, Miroslav, Pękala, Jan, Pelayo, Rodrigo, Pepe, Iuri, Perrone, Lorenzo, Petermann, Emily, Peters, Christine, Petrera, Sergio, Petrov, Yevgeniy, Phuntsok, Jamyang, Piegaia, Ricardo, Pierog, Tanguy, Pieroni, Pablo, Pimenta, Mário, Pirronello, Valerio, Platino, Manuel, Plum, Matthias, Porcelli, Alessio, Porowski, Czeslaw, Prado, Raul Ribeiro, Privitera, Paolo, Prouza, Michael, Purrello, Victor, Quel, Eduardo J, Querchfeld, Sven, Quinn, Sean, Rautenberg, Julian, Ravel, Olivier, Ravignani, Diego, Revenu, Benoît, Ridky, Jan, Riggi, Simone, Risse, Markus, Ristori, Pablo, Rizi, Vincenzo, de Carvalho, Washington Rodrigues, Fernandez, Gonzalo Rodriguez, Rojo, Jorge Rubén Rodriguez, Rodríguez-Frías, Maria Dolores, Rogozin, Dmytro, Rosado, Jaime, Roth, Markus, Roulet, Esteban, Rovero, Adrian, Saffi, Steven J, Saftoiu, Alexandra, Salamida, Francesco, Salazar, Humberto, Saleh, Ahmed, Greus, Francisco Salesa, Salina, Gaetano, Sánchez, Federico, Sanchez-Lucas, Patricia, Santos, Edivaldo Moura, Santos, Eva, Sarazin, Fred, Sarkar, Biswaijt, Sarmento, Raul, Sato, Ricardo, Scarso, Carlos, Schauer, Markus, Scherini, Viviana, Schieler, Harald, Schiffer, Peter, Schmidt, David, Scholten, Olaf, Schoorlemmer, Harm, Schovánek, Petr, Schröder, Frank G, Schulz, Alexander, Schulz, Johannes, Schumacher, Johannes, Sciutto, Sergio, Segreto, Alberto, Settimo, Mariangela, Shadkam, Amir, Shellard, Ronald C, Sidelnik, Iván, Sigl, Guenter, Sima, Octavian, Śmiałkowski, Andrzej, Šmída, Radomir, Snow, Gregory, Sommers, Paul, Sorokin, J, Squartini, Ruben, Srivastava, Yogendra N, Stanca, Denis, Stanič, Samo, Stapleton, James, Stasielak, Jaroslaw, Stephan, Maurice, Stutz, Anne, Suarez, Federico, Suomijärvi, Tiina, Supanitsky, A Daniel, Sutherland, Michael, Swain, John, Szadkowski, Zbigniew, Taborda, Oscar Alejandro, Tapia, Alex, Tepe, Andreas, Theodoro, Vanessa Menezes, Timmermans, Charles, Peixoto, Carlos J Todero, Toma, Gabriel, Tomankova, Lenka, Tomé, Bernardo, Tonachini, Aurelio, Elipe, Guillermo Torralba, Machado, Diego Torres, Travnicek, Petr, Ulrich, Ralf, Unger, Michael, Urban, Martin, Galicia, Jose F Valdés, Valiño, Ines, Valore, Laura, van Aar, Guus, van Bodegom, Patrick, Berg, Ad M van den, van Velzen, Sjoert, van Vliet, Arjen, Varela, Enrique, Cárdenas, Bernardo Vargas, Varner, Gary, Vasquez, Rafael, Vázquez, Jose R, Vázquez, Ricardo, Veberič, Darko, Verzi, Valerio, Vicha, Jakub, Videla, Mariela, Villaseñor, Luis, Vlcek, Brian, Vorobiov, Serguei, Wahlberg, Hernan, Wainberg, Oscar, Walz, David, Watson, Alan, Weber, Marc, Weidenhaupt, Klaus, Weindl, Andreas, Werner, Felix, Widom, Allan, Wiencke, Lawrence, Wilczyński, Henryk, Winchen, Tobias, Wittkowski, David, Wundheiler, Brian, Wykes, Sarka, Yang, Lili, Yapici, Tolga, Yushkov, Alexey, Zas, Enrique, Zavrtanik, Danilo, Zavrtanik, Marko, Zepeda, Arnulfo, Zhu, Yue, Zimmermann, Benedikt, Ziolkowski, Michael, and Zuccarello, Francesca
Subjects: Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract: A measurement of the cosmic-ray spectrum for energies exceeding $4{\times}10^{18}$ eV is presented, which is based on the analysis of showers with zenith angles greater than $60^{\circ}$ detected with the Pierre Auger Observatory between 1 January 2004 and 31 December 2013. The measured spectrum confirms a flux suppression at the highest energies. Above $5.3{\times}10^{18}$ eV, the "ankle", the flux can be described by a power law $E^{-\gamma}$ with index $\gamma=2.70 \pm 0.02 \,\text{(stat)} \pm 0.1\,\text{(sys)}$ followed by a smooth suppression region. For the energy ($E_\text{s}$) at which the spectral flux has fallen to one-half of its extrapolated value in the absence of suppression, we find $E_\text{s}=(5.12\pm0.25\,\text{(stat)}^{+1.0}_{-1.2}\,\text{(sys)}){\times}10^{19}$ eV., Comment: Replaced with published version. Added journal reference and DOI
Published: 2015
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22. Simulations of reflected radio signals from cosmic ray induced air showers

Author: Alvarez-Muñiz, Jaime, Carvalho Jr., Washington R., García-Fernández, Daniel, Schoorlemmer, Harm, and Zas, Enrique
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: We present the calculation of coherent radio pulses emitted by extensive air showers induced by ultra-high energy cosmic rays accounting for reflection on the Earth's surface. Results have been obtained with a simulation program that calculates the contributions from shower particles after reflection at a surface plane. The properties of the radiation are discussed in detail emphasizing the effects of reflection. The shape of the frequency spectrum is shown to be closely related to the angle of the observer with respect to shower axis, becoming hardest in the Cherenkov direction. The intensity of the flux at a fixed observation angle is shown to scale with the square of the primary particle energy to very good accuracy indicating the coherent aspect of the emission. The simulation methods of this paper provide the foundations for energy reconstruction of experiments looking at the Earth from balloons and satellites. They can also be used in dedicated studies of existing and future experimental proposals.
Published: 2015
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23. Radio pulses from ultra-high energy atmospheric showers as the superposition of Askaryan and geomagnetic mechanisms

Author: Alvarez-Muñiz, Jaime, Carvalho Jr., Washington R., Schoorlemmer, Harm, and Zas, Enrique
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: Radio emission in atmospheric showers is currently interpreted in terms of radiation due to the deviation of the charged particles in the magnetic field of the Earth and to the charge excess (Askaryan effect). Each of these mechanisms has a distinctive polarization. The complex signal patterns can be qualitatively explained as the interference (superposition) of the fields induced by each mechanism. In this work we explicitly and quantitatively test a simple phenomenological model based on this idea. The model is constructed by isolating each of the two components at the simulation level and by making use of approximate symmetries for each of the contributions separately. The results of the model are then checked against full ZHAireS Monte Carlo simulations of the electric field calculated from first principles. We show that the simple model describes radio emission at a few percent level in a wide range of shower-observer geometries and on a shower-by-shower basis. As a consequence, this approach provides a simple method to reduce the computing time needed to accurately predict the electric field of radio pulses emitted from air showers, with many practical applications in experimental situations of interest., Comment: Replaced with revised version published in Astroparticle Physics
Published: 2014
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24. The Pierre Auger Observatory: Contributions to the 33rd International Cosmic Ray Conference (ICRC 2013)

Author: The Pierre Auger Collaboration, Aab, Alexander, Abreu, Pedro, Aglietta, Marco, Ahlers, Markus, Ahn, Eun-Joo, Albuquerque, Ivone, Allekotte, Ingomar, Allen, Jeff, Allison, Patrick, Almela, Alejandro, Castillo, Jesus Alvarez, Alvarez-Muñiz, Jaime, Batista, Rafael Alves, Ambrosio, Michelangelo, Aminaei, Amin, Anchordoqui, Luis, Andringa, Sofia, Antičić, Tome, Aramo, Carla, Arqueros, Fernando, Asorey, Hernán Gonzalo, Assis, Pedro, Aublin, Julien, Ave, Maximo, Avenier, Michel, Avila, Gualberto, Badescu, Alina Mihaela, Barber, Kerri B., Bardenet, Remi, Bäuml, Julia, Baus, Colin, Beatty, Jim, Becker, Karl Heinz, Bellido, Jose A., BenZvi, Segev, Berat, Corinne, Bertou, Xavier, Biermann, Peter, Billoir, Pierre, Blanco, Francisco, Blanco, Miguel, Bleve, Carla, Blümer, Hans, Boháčová, Martina, Boncioli, Denise, Bonifazi, Carla, Bonino, Raffaella, Borodai, Nataliia, Brack, Jeffrey, Brancus, Iliana, Brogueira, Pedro, Brown, William C., Buchholz, Peter, Bueno, Antonio, Buscemi, Mario, Caballero-Mora, Karen S., Caccianiga, Barbara, Caccianiga, Lorenzo, Candusso, Marina, Caramete, Laurentiu, Caruso, Rossella, Castellina, Antonella, Cataldi, Gabriella, Cazon, Lorenzo, Cester, Rosanna, Cheng, Shih-Ho, Chiavassa, Andrea, Chinellato, Jose Augusto, Chudoba, Jiri, Cilmo, Marco, Clay, Roger W, Cocciolo, Giuseppe, Colalillo, Roberta, Collica, Laura, Coluccia, Maria Rita, Conceição, Ruben, Contreras, Fernando, Cooper, Mathew J., Coutu, Stephane, Covault, Corbin, Criss, Adrienne, Cronin, James, Curutiu, Alex, Dallier, Richard, Daniel, Bruno, Dasso, Sergio, Daumiller, Kai, Dawson, Bruce R., de Almeida, Rogerio M., De Domenico, Manlio, de Jong, Sijbrand J., De La Vega, Gonzalo, Junior, Walter J. M. de Mello, Neto, Joao de Mello, De Mitri, Ivan, de Souza, Vitor, de Vries, Krijn, del Peral, Luis, Deligny, Olivier, Dembinski, Hans, Dhital, Niraj, Di Giulio, Claudio, Di Matteo, Armando, Diaz, Johana Chirinos, Castro, Mary Lucia Díaz, Diep, Pham Ngoc, Diogo, Francisco, Dobrigkeit, Carola, Docters, Wendy, D'Olivo, Juan Carlos, Dong, Pham Ngoc, Dorofeev, Alexei, Anjos, Joao dos, Dova, Maria Teresa, Ebr, Jan, Engel, Ralph, Erdmann, Martin, Escobar, Carlos O., Espadanal, Joao, Etchegoyen, Alberto, Luis, Pedro Facal San, Falcke, Heino, Fang, Ke, Farrar, Glennys, Fauth, Anderson, Fazzini, Norberto, Ferguson, Andrew P., Fick, Brian, Figueira, Juan Manuel, Filevich, Alberto, Filipčič, Andrej, Foerster, Nadine, Fox, Brendan, Fracchiolla, Claudia, Fraenkel, Eric Daniel, Fratu, Octavian, Fröhlich, Uwe, Fuchs, Benjamin, Gaior, Romain, Gamarra, Rodolfo Federico, Gambetta, Silvia, García, Beatriz, Roca, Sayri Tupac Garcia, Garcia-Gamez, Diego, Garcia-Pinto, Diego, Garilli, Gianpaolo, Bravo, Alberto Gascon, Gemmeke, Hartmut, Ghia, Piera Luisa, Giammarchi, Marco, Giller, Maria, Gitto, Javier, Glaser, Christian, Glass, Henry, Albarracin, Flavia Gomez, Berisso, Mariano Gómez, Vitale, Primo F. Gómez, Gonçalves, Patrícia, Gonzalez, Javier G., Gookin, Ben, Gorgi, Alessio, Gorham, Peter, Gouffon, Philippe, Grebe, Stefan, Griffith, Nathan, Grillo, Aurelio, Grubb, Trent D., Guardincerri, Yann, Guarino, Fausto, Guedes, Germano, Hansen, Patricia, Harari, Diego, Harrison, Thomas A., Harton, John, Haungs, Andreas, Hebbeker, Thomas, Heck, Dieter, Herve, Alexander E., Hill, Gary C., Hojvat, Carlos, Hollon, Nicholas, Holt, Ewa, Homola, Piotr, Hörandel, Joerg, Horvath, Pavel, Hrabovský, Miroslav, Huber, Daniel, Huege, Tim, Insolia, Antonio, Isar, Paula Gina, Jansen, Stefan, Jarne, Cecilia, Josebachuili, Mariela, Kadija, Krešo, Kambeitz, Olga, Kampert, Karl Heinz, Karhan, Pavel, Kasper, Peter, Katkov, Igor, Kégl, Balazs, Keilhauer, Bianca, Keivani, Azadeh, Kemp, Ernesto, Kieckhafer, Roger, Klages, Hans, Kleifges, Matthias, Kleinfeller, Jonny, Knapp, Johannes, Krause, Raphael, Krohm, Nicole, Krömer, Oliver, Kruppke-Hansen, Daniel, Kuempel, Daniel, Kunka, Norbert, La Rosa, Giovanni, LaHurd, Danielle, Latronico, Luca, Lauer, Robert, Lauscher, Markus, Lautridou, Pascal, Coz, Sandra Le, Leão, Milton, Lebrun, Paul, Lebrun, Didier, de Oliveira, Marcelo Augusto Leigui, Letessier-Selvon, Antoine, Lhenry-Yvon, Isabelle, Link, Katrin, López, Rebeca, Agüera, Angeles Lopez, Louedec, Karim, Bahilo, Julio Lozano, Lu, Lu, Lucero, Agustin, Ludwig, Marianne, Lyberis, Haris, Maccarone, Maria Concetta, Malacari, Max, Maldera, Simone, Maller, Jennifer, Mandat, Dusan, Mantsch, Paul, Mariazzi, Analisa, Marin, Vincent, Mariş, Ioana, Falcon, Hugo R. Marquez, Marsella, Giovanni, Martello, Daniele, Martin, Lilian, Martinez, Humberto, Bravo, Oscar Martínez, Martraire, Diane, Meza, Jimmy Masías, Mathes, Hermann-Josef, Matthews, James, Matthews, John A. J., Matthiae, Giorgio, Maurel, Detlef, Maurizio, Daniela, Mayotte, Eric, Mazur, Peter, Medina, Carlos, Medina-Tanco, Gustavo, Melissas, Maximilien, Melo, Diego, Menichetti, Ezio, Menshikov, Alexander, Messina, Stefano, Meyhandan, Rishi, Mićanović, Saša, Micheletti, Maria Isabel, Middendorf, Lukas, Minaya, Ignacio A., Miramonti, Lino, Mitrica, Bogdan, Molina-Bueno, Laura, Mollerach, Silvia, Monasor, Maria, Ragaigne, Delphine Monnier, Montanet, François, Morales, Benjamin, Morello, Carlo, Moreno, Juan Cruz, Mostafá, Miguel, Moura, Celio A., Muller, Marcio Aparecido, Müller, Gero, Münchmeyer, Moritz, Mussa, Roberto, Navarra, Gianni, Navarro, Jose Luis, Navas, Sergio, Necesal, Petr, Nellen, Lukas, Nelles, Anna, Neuser, Jens, Nhung, Pham Thi Tuyet, Niechciol, Marcus, Niemietz, Lukas, Niggemann, Tim, Nitz, Dave, Nosek, Dalibor, Nožka, Libor, Oehlschläger, Juergen, Olinto, Angela, Oliveira, Micael, Ortiz, Montserrat, Pacheco, Noelia, Selmi-Dei, Daniel Pakk, Palatka, Miroslav, Pallotta, Juan, Palmieri, Nunzia, Parente, Gonzalo, Parra, Alejandra, Pastor, Sergio, Paul, Thomas, Pech, Miroslav, Pękala, Jan, Pelayo, Rodrigo, Pepe, Iuri, Perrone, Lorenzo, Pesce, Roberto, Petermann, Emily, Petrera, Sergio, Petrolini, Alessandro, Petrov, Yevgeniy, Piegaia, Ricardo, Pierog, Tanguy, Pieroni, Pablo, Pimenta, Mário, Pirronello, Valerio, Platino, Manuel, Plum, Matthias, Pontz, Michael, Porcelli, Alessio, Preda, Titi, Privitera, Paolo, Prouza, Michael, Quel, Eduardo J, Querchfeld, Sven, Quinn, Sean, Rautenberg, Julian, Ravel, Olivier, Ravignani, Diego, Revenu, Benoît, Ridky, Jan, Riggi, Simone, Risse, Markus, Ristori, Pablo, Rivera, Hugo M., Rizi, Vincenzo, Roberts, Jonathan, de Carvalho, Washington Rodrigues, Cabo, Iago Rodriguez, Fernandez, Gonzalo Rodriguez, Martino, Julio Rodriguez, Rojo, Jorge Rubén Rodriguez, Rodríguez-Frías, Maria Dolores, Ros, Germán, Rosado, Jaime, Rossler, Tomas, Roth, Markus, Rouillé-d'Orfeuil, Benjamin, Roulet, Esteban, Rovero, Adrian, Rühle, Christoph, Saffi, Steven J., Saftoiu, Alexandra, Salamida, Francesco, Salazar, Humberto, Greus, Francisco Salesa, Salina, Gaetano, Sánchez, Federico, Sanchez-Lucas, Patricia, Santo, Catarina E., Santos, Eva, Santos, Edivaldo Moura, Sarazin, Fred, Sarkar, Biswaijt, Sarmento, Raul, Sato, Ricardo, Scharf, Nils, Scherini, Viviana, Schieler, Harald, Schiffer, Peter, Schmidt, Adrian, Scholten, Olaf, Schoorlemmer, Harm, Schovánek, Petr, Schröder, Frank G., Schulz, Alexander, Schulz, Johannes, Sciutto, Sergio, Scuderi, Mario, Segreto, Alberto, Settimo, Mariangela, Shadkam, Amir, Shellard, Ronald C., Sidelnik, Iván, Sigl, Guenter, Sima, Octavian, Śmiałkowski, Andrzej, Šmída, Radomir, Snow, Gregory, Sommers, Paul, Sorokin, J., Spinka, Hal, Squartini, Ruben, Srivastava, Yogendra N., Stanič, Samo, Stapleton, James, Stasielak, Jaroslaw, Stephan, Maurice, Straub, Marcel, Stutz, Anne, Suarez, Federico, Suomijärvi, Tiina, Supanitsky, A. Daniel, Šuša, Tatjana, Sutherland, Michael, Swain, John, Szadkowski, Zbigniew, Szuba, Marek, Tapia, Alex, Tartare, Mathieu, Taşcău, Oana, Thao, Nguyen Thi, Tiffenberg, Javier, Timmermans, Charles, Tkaczyk, Wieslaw, Peixoto, Carlos J. Todero, Toma, Gabriel, Tomankova, Lenka, Tomé, Bernardo, Tonachini, Aurelio, Elipe, Guillermo Torralba, Machado, Diego Torres, Travnicek, Petr, Tridapalli, Diogo, Trovato, Enrica, Tueros, Matias, Ulrich, Ralf, Unger, Michael, Galicia, Jose F. Valdés, Valiño, Ines, Valore, Laura, van Aar, Guus, Berg, Ad M. van den, van Velzen, Sjoert, van Vliet, Arjen, Varela, Enrique, Cárdenas, Bernardo Vargas, Varner, Gary, Vázquez, Jose R., Vázquez, Ricardo, Veberič, Darko, Verzi, Valerio, Vicha, Jakub, Videla, Mariela, Villaseñor, Luis, Wahlberg, Hernan, Wahrlich, Philip, Wainberg, Oscar, Walz, David, Watson, Alan, Weber, Marc, Weidenhaupt, Klaus, Weindl, Andreas, Werner, Felix, Westerhoff, Stefan, Whelan, Ben J., Widom, Allan, Wieczorek, Grzegorz, Wiencke, Lawrence, Wilczyńska, Barbara, Wilczyński, Henryk, Will, Martin, Williams, Christopher, Winchen, Tobias, Wundheiler, Brian, Wykes, Sarka, Yamamoto, Tokonatsu, Yapici, Tolga, Younk, Patrick, Yuan, Guofeng, Yushkov, Alexey, Zamorano, Bruno, Zarza, Gabriel, Zas, Enrique, Zavrtanik, Danilo, Zavrtanik, Marko, Zaw, Ingyin, Zepeda, Arnulfo, Zhou, Jing, Zhu, Yue, Silva, Marcelo Zimbres, and Ziolkowski, Michael
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: Contributions of the Pierre Auger Collaboration to the 33rd International Cosmic Ray Conference, Rio de Janeiro, Brazil, July 2013, Comment: Contributions to the 33rd International Cosmic Ray Conference, Rio de Janeiro, Brazil, July 2013
Published: 2013

25. Calculations of electric fields for radio detection of Ultra-High Energy particles

Author: García-Fernández, Daniel, Alvarez-Muñiz, Jaime, Carvalho Jr, Washington R., Romero-Wolf, Andrés, and Zas, Enrique
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: The detection of electromagnetic pulses from high energy showers is used as a means to search for Ultra-High Energy cosmic ray and neutrino interactions. An approximate formula has been obtained to numerically evaluate the radio pulse emitted by a charged particle that instantaneously accelerates, moves at constant speed along a straight track and halts again instantaneously. The approximate solution is applied to the particle track after dividing it in smaller subintervals. The resulting algorithm (often referred to as the ZHS algorithm) is also the basis for most of the simulations of the electric field produced in high energy showers in dense media. In this work, the electromagnetic pulses as predicted with the ZHS algorithm are compared to those obtained with an exact solution of the electric field produced by a charged particle track. The precise conditions that must apply for the algorithm to be valid are discussed and its accuracy is addressed. This comparison is also made for electromagnetic showers in dense media. The ZHS algorithm is shown to describe Cherenkov radiation and to be valid for most situations of interest concerning detectors searching for Ultra-High Energy neutrinos. The results of this work are also relevant for the simulation of pulses emitted from air showers., Comment: 12 pages, 7 figures
Published: 2012
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26. Coherent Radiation from Extensive Air Showers in the Ultra-High Frequency Band

Author: Alvarez-Muñiz, Jaime, Carvalho Jr., Washington R., Romero-Wolf, Andrés, Tueros, Matías, and Zas, Enrique
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: Using detailed Monte Carlo simulations we have characterized the features of the radio emission of inclined air showers in the Ultra-High Frequency band (300 MHz - 3 GHz). The Fourier-spectrum of the radiation is shown to have a sizable intensity well into the GHz frequency range. The emission is mainly due to transverse currents induced by the geomagnetic field and to the excess charge produced by the Askaryan effect. At these frequencies only a significantly reduced volume of the shower around the axis contributes coherently to the signal observed on the ground. The size of the coherently emitting volume depends on frequency, shower geometry and observer position, and is interpreted in terms of the relative time delays. At ground level, the maximum emission at high frequencies is concentrated in an elliptical ring-like region around the intersection of a Cherenkov cone with its vertex at shower maximum and the ground. The frequency spectrum of inclined showers when observed at positions that view shower maximum in the Cherenkov direction, is shown to be in broad agreement with the pulses detected by the Antarctic Impulsive Transient Antenna (ANITA) experiment, making the interpretation that they are due to Ultra-High Energy Cosmic Ray atmospheric showers consistent with our simulations. These results are also of great importance for experiments aiming to detect molecular bremsstrahlung radiation in the GHz range as they present an important background for its detection., Comment: 8 pages, 8 figures
Published: 2012
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27. Monte Carlo simulations of radio pulses in atmospheric showers using ZHAireS

Author: Alvarez-Muñiz, Jaime, Carvalho Jr., Washington R., and Zas, Enrique
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We present predictions for the radio pulses emitted by extensive air showers using ZHAireS, an AIRES-based Monte Carlo code that takes into account the full complexity of ultra-high energy cosmic-ray induced shower development in the atmosphere, and allows the calculation of the electric field in both the time and frequency domains. We do not presuppose any emission mechanism, but our results are compatible with a superposition of geomagnetic and charge excess radio emission effects. We investigate the polarization of the electric field as well as the effects of the refractive index n and shower geometry on the radio pulses. We show that geometry, coupled to the relativistic effects that appear when using a realistic n>1, play a prominent role on the radio emission of air showers., Comment: Replaced with version published in Astroparticle Physics
Published: 2011
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28. Practical and accurate calculations of Askaryan radiation

Author: Alvarez-Muñiz, Jaime, Romero-Wolf, Andrés, and Zas, Enrique
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: An in-depth characterization of coherent radio Cherenkov pulses from particle showers in dense dielectric media, referred to as the Askaryan effect, is presented. The time-domain calculation developed in this article is based on a form factor to account for the lateral dimensions of the shower. It is computationally efficient and able to reproduce the results of detailed particle shower simulations with high fidelity in most regions of practical interest including Fresnel effects due to the longitudinal development of the shower. In addition, an intuitive interpretation of the characteristics of the Askaryan pulse is provided. We expect our approach to benefit the analysis of radio pulses in experiments exploiting the radio technique., Comment: Replaced with version published Phys. Rev. D
Published: 2011
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29. Coherent Cherenkov radio pulses from hadronic showers up to EeV energies

Author: Alvarez-Muniz, Jaime, Carvalho Jr., Washington R., Tueros, Matias, and Zas, Enrique
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: The Cherenkov radio pulse emitted by hadronic showers in ice is calculated for showers of energies in the EeV range. This is obtained with three dimensional simulations of both shower development and the coherent radio pulse emitted as the excess charge develops in the shower. A Monte Carlo, ZHAireS, has been developed for this purpose combining the high energy hadronic interaction capabilities of AIRES, and the dense media propagation capabilities of TIERRAS, with the precise low energy tracking and specific algorithms developed to calculate the radio emission in ZHS. A thinning technique is implemented and optimized to allow the simulation of radio pulses induced by showers up to 10 EeV in ice. The code is validated comparing the results for electromagnetic and hadronic showers to those obtained with GEANT4 and ZHS codes. The contribution to the pulse of other shower particles in addition to electrons and positrons, mainly pions and muons, is found to be below 1%. The characteristics of hadronic showers and the corresponding Cherenkov frequency spectra are compared with those from purely electromagnetic showers. The dependence of the spectra on shower energy and high-energy hadronic model is addressed and parameterizations for the radio emission in hadronic showers in ice are given for practical applications., Comment: Replaced with version published in Astroparticle Physics
Published: 2010
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30. Cherenkov radio pulses from electromagnetic showers in the time-domain

Author: Alvarez-Muniz, Jaime, Romero-Wolf, Andres, and Zas, Enrique
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: The electric field of the Cherenkov radio pulse produced by a single charged particle track in a dielectric medium is derived from first principles. An algorithm is developed to obtain the pulse in the time domain for numerical calculations. The algorithm is implemented in a Monte Carlo simulation of electromagnetic showers in dense media (specifically designed for coherent radio emission applications) as might be induced by interactions of ultra-high energy neutrinos. The coherent Cherenkov radio emission produced by such showers is obtained simultaneously both in the time and frequency domains. A consistency check performed by Fourier-transforming the pulse in time and comparing it to the frequency spectrum obtained directly in the simulations yields, as expected, fully consistent results. The reversal of the time structure inside the Cherenkov cone and the signs of the corresponding pulses are addressed in detail. The results, besides testing algorithms used for reference calculations in the frequency domain, shed new light into the properties of the radio pulse in the time domain. The shape of the pulse in the time domain is directly related to the depth development of the excess charge in the shower and its width to the observation angle with respect to the Cherenkov direction. This information can be of great practical importance for interpreting actual data., Comment: 10 pages, 4 figures
Published: 2010
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31. Coherent radio pulses from showers in different media: A unified parameterization

Author: Alvarez-Muñiz, Jaime, Marqués, Enrique, Vázquez, Ricardo A., and Zas, Enrique
Subjects: Astrophysics
Abstract: We study the frequency and angular dependences of Cherenkov radio pulses originated by the excess of electrons in electromagnetic showers in different dense media. We develop a simple model to relate the main characteristics of the electric field spectrum to the properties of the shower such as longitudinal and lateral development. This model allows us to establish the scaling of the electric field spectrum with the properties of the medium such as density, radiation length, Moliere radius, critical energy and refraction index. We normalize the predictions of the scaling relations to the numerical results obtained in our own developed GEANT4-based Monte Carlo simulation, and we give a unified parameterization of the frequency spectrum and angular distribution of the electric field in ice, salt, and the lunar regolith, in terms of the relevant properties of the media. Our parameterizations are valid for electromagnetic showers below the energy at which the Landau-Pomeranchuk-Migdal effect starts to be relevant in these media. They also provide an approximate estimate of radio emission in hadronic showers induced by high energy cosmic rays or neutrinos., Comment: 7 pages, 4 figures
Published: 2005
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32. Neutrino Detection with Inclined Air Showers

Author: Zas, Enrique
Subjects: Astrophysics
Abstract: The possibilities of detecting high energy neutrinos through inclined showers produced in the atmosphere are addressed with an emphasis on the detection of air showers by arrays of particle detectors. Rates of inclined showers produced by both down-going neutrino interactions and by up-coming $\tau$ decays from earth-skimming neutrinos as a function of shower energy are calculated with analytical methods using two sample neutrino fluxes with different spectral indices. The relative contributions from different flavors and charged, neutral current and resonant interactions are compared for down-going neutrinos interacting in the atmosphere. No detailed description of detectors is attempted but rough energy thresholds are implemented to establish the ranges of energies which are more suitable for neutrino detection through inclined showers. Down-going and up-coming rates are compared., Comment: Submitted to New Journal of Physics
Published: 2005
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33. Astroparticle Physics: The High Energy Tail of the Cosmic Ray Spectrum

Author: Zas, Enrique
Subjects: Astrophysics
Abstract: In this article I review the main theoretical problems that are posed by the highest energy end of the observed cosmic ray spectrum, stressing the importance of establishing their composition in order to decide between proposed scenarios. I then discuss the possibilities that are opened by the detection of inclined showers with extensive air shower arrays. Recent progress in modelling magnetic deviations for these showers has allowed the analysis of inclined showers that were detected by the Haverah Park experiment. This analysis disfavours models that predict a large proportion of photons in the highest energy cosmic rays and open up new possibilities for future shower array detectors particularly those, like the Pierre Auger Observatory, using water Cherenkov detectors., Comment: Latex file, espcrc2.sty, 8 pages, 4 figures, talk given at the EuroConference on Frontiers in Particle Astrophysics and Cosmology, San Feliu de Guixols, October 2000
Published: 2001
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34. ZeV Air Showers: The View from Auger

Author: Zas, Enrique
Subjects: Astrophysics
Abstract: In this article I briefly discuss the characteristics of the Auger observatories paying particular attention to the role of inclined showers, both in the search for high energy neutrino interactions deep in the atmosphere and as an alternative tool for the study of cosmic rays, particulartly their composition., Comment: Latex file, aipproc.sty and epsfig.sty, 10 pages, 5 figures, talk given at the 1st International Workshop on Radio Detection of High Energy Particles (RADHEP-2000), UCLA, November 2000
Published: 2001
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35. Calculations of radio pulses from High Energy Showers

Author: Alvarez-Muñiz, Jaime and Zas, Enrique
Subjects: Astrophysics
Abstract: In this article we review the progress made in understanding the main characteristics of coherent \v{C}erenkov radiation induced by high energy showers in dense media. A specific code developed for this purpose is described because it took a significant part in this process. Subsequent approximations developed for the calculation of radio pulses from EeV showers are reviewed. Emphasis is given to the relation between the shower characteristics and different features of the corresponding radio emission., Comment: Latex file, aipproc.sty and epsfig.sty, 11 pages, 6 figures, talk given at the 1st International Workshop on Radio Detection of High Energy Particles (RADHEP-2000), UCLA, November 2000
Published: 2001
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36. Summary: ZeV Air Showers. Where do we Stand?

Author: Zas, Enrique
Subjects: Astrophysics
Abstract: Here an attempt is made at summarizing the presentations, most of which were about the highest energy particles observed in nature. Particular attention is paid to the solutions to the Ultra High Energy Cosmic Ray particles, to the new and forthcoming data, to the new proposals for experiments and to the role of primary composition, that were amongst the most discussed subtopics., Comment: 19 pages, LaTeX, aipproc, Summary talk given at the International Workshop on Observing UHECR from space and earth, August 9-12-2000, Metepec, Puebla, Mexico
Published: 2000
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37. A New Approach to Mass Measurements of UHECR: Horizontal Air Showers

Author: Zas, Enrique
Subjects: Astrophysics
Abstract: The role of Horizontal Showers induced by cosmic rays is discussed in detail. A new approach to the calculation of the muon component in horizontal air showers induced by protons, heavier nuclei or photons is presented which allows a simple analytical evaluation of the muon density profiles at ground level. The results of the first application of these results to horizontal air showers detected at the Haverah Park Array by the recently started {\sl Leeds-Santiago collaboration}, leading to important restrictions on composition at ultra high energies, are reported., Comment: 16 pages, LaTeX, aipproc, Talk given at the International Workshop on Observing UHECR from space and earth, August 9-12-2000, Metepec, Puebla, Mexico
Published: 2000
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38. Particle Astrophysics at Zettavolt Energies with Radio Detectors in Low Lunar Orbit

Author: Romero-Wolf, Andrew, Alvarez-Muñiz, Jaime, Anchordoqui, Luis A, Bergman, Douglas, Carvalho Jr., Washington, Cummings, Austin L, Gorham, Peter, Handmer, Casey J, Harvey, Nate, Krizmanich, John, Nishimura, Kurtis, Prechelt, Remy, Reno, Mary Hall, Schoorlemmer, Harm, Varner, Gary, Venters, Tonia, Wissel, Stephanie, and Zas, Enrique
Published: 2021

39. Particle Astrophysics at Zettavolt Energies with Radio Detectors in Low Lunar Orbit

Author: Zas, Enrique, Wissel, Stephanie, Venters, Tonia, Varner, Gary, Schoorlemmer, Harm, Reno, Mary Hall, Prechelt, Remy, Nishimura, Kurtis, Krizmanich, John, Harvey, Nate, Handmer, Casey J, Gorham, Peter, Cummings, Austin L, Carvalho Jr., Washington, Bergman, Douglas, Anchordoqui, Luis A, Alvarez-Muñiz, Jaime, and Romero-Wolf, Andrew
Published: 2021

40. TAMBO: Searching for Tau Neutrinos in the Peruvian Andes

Author: Thompson, Will, primary, Alvarez-Muniz, Jaime, additional, Argüelles, Carlos, additional, Bazo, Jose, additional, Bellido, Jose, additional, Bustamante, Mauricio, additional, Cummings, Austion, additional, Delgado, Diyaselis, additional, Fernández, Pablo, additional, Gago, Alberto, additional, Garcia-Soto, Alfonso, additional, Kheirandish, Ali, additional, Lazar, Jeffrey, additional, Romero-Wolf, Andres, additional, Safa, Ibrahim, additional, Schoorlemmer, Harm, additional, Vincent, Aaron, additional, Wissel, Stephanie, additional, Zas, Enrique, additional, Zhelnin, Pavel, additional, and Jr., Washington Carvalho, additional
Published: 2023
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41. Transition radiation and the anomalous events of ANITA

Author: Ammerman-Yebra, Juan, primary, Alvarez-Muniz, Jaime, additional, and Zas, Enrique, additional
Published: 2023
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42. Density and magnetic field strength dependence of radio pulses induced by energetic air showers

Author: Ammerman-Yebra, Juan, primary, Alvarez-Muñiz, Jaime, additional, and Zas, Enrique, additional
Published: 2023
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43. Detection of Radio Emission by Cosmic Rays with the BEACON Prototype

Author: Zeolla, Andrew James, primary, Alvarez-Muniz, Jaime, additional, Cummings, Austin, additional, Deaconu, Cosmin, additional, Decoene, Valentin, additional, Hughes, Kaeli Autumn, additional, Krebs, Ryan, additional, Ludwig, Andrew, additional, Mulrey, Katie, additional, Oberla, Eric, additional, Prohira, Steven, additional, Jr., Washington Carvalho, additional, Romero-Wolf, Andres, additional, Schoorlemmer, Harm, additional, Southall, Daniel, additional, Vieregg, Abigail G., additional, Wissel, Stephanie, additional, and Zas, Enrique, additional
Published: 2023
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44. Simulation of coherent radio pulses in air using the ZHS Monte Carlo

Author: Ammerman-Yebra, Juan, primary, Alvarez-Muniz, Jaime, additional, and Zas, Enrique, additional
Published: 2023
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45. The Highest Energy Neutrinos

Author: Zas, Enrique
Subjects: Astrophysics
Abstract: Some neutrino predictions at the highest energies for a number of production mechanisms are comparatively reviewed in the light of future projects for neutrino detection., Comment: 10 pages, 2 figs, LaTeX epsf, talk given in "Very High Energy Phenomena in the Universe", XXXIInd Rencontres de Moriond, 1997
Published: 1997

46. Neutrino Induced Events in the Pierre Auger Detector

Author: Parente, Gonzalo and Zas, Enrique
Subjects: Astrophysics, High Energy Physics - Phenomenology
Abstract: We study the potential of the Pierre Auger detector for horizontal air showers initiated by ultra high energy neutrino. Assuming some simple trigger requirements we obtain measurable event rates for neutrino fluxes from AGN, from topological defects and from the interactions of cosmic rays with the microwave background., Comment: Latex file (9 pages), 3 Postscript figures, uses procsla.sty and epsfig.sty. To appear in Proceedings of the High Energy Neutrino Workshop (Venice, 1996)
Published: 1996

47. NEUTRINOS FROM PRIMORDIAL BLACK HOLES

Author: Halzen, Francis, Keszthelyi, Bettina, and Zas, Enrique
Subjects: High Energy Physics - Phenomenology, Astrophysics
Abstract: The emission of particles from black holes created in the early Universe has detectable astrophysical consequences. The most stringent bound on their abundance has been obtained from the absence of a detectable diffuse flux of 100 MeV photons. Further scrutiny of these bounds is of interest as they, for instance, rule out primordial black holes as a dark matter candidate. We here point out that these bounds can, in principle, be improved by studying the diffuse cosmic neutrino flux. Measurements of near-vertical atmospheric neutrino fluxes in a region of low geomagnetic latitude can provide a competitive bound. The most favorable energy to detect a possible diffuse flux of primordial black hole origin is found to be a few MeV. We also show that measurements of the diffuse $\nu _\tau$ flux is the most promising to improve the existing bounds deduced from gamma-ray measurements. Neutrinos from individual black hole explosions can be detected in the GeV-TeV energy region. We find that the kilometer-scale detectors, recently proposed, are able to establish competitive bounds., Comment: 19 pages plus 9 uuencoded and compressed postscript figures
Published: 1995
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48. The Beamforming Elevated Array for COsmic Neutrinos (BEACON): A Radio Detector for Earth-Skimming Tau Neutrinos

Author: Zeolla, Andrew James, primary, Alvarez-Muniz, Jaime, additional, Cummings, Austin, additional, Curtis-Ginsberg, Zachary, additional, Deaconu, Cosmin, additional, Decoene, Valentin, additional, Hendrick, Angus, additional, Hughes, Kaeli Autumn, additional, Krebs, Ryan, additional, Ludwig, Andrew, additional, Mulrey, Katie, additional, Oberla, Eric, additional, Prohira, Steven, additional, Rodrigues de Carvalho, Washington, additional, Rodriguez, A., additional, Romero-Wolf, Andres, additional, Schoorlemmer, Harm, additional, Southall, Dan, additional, Vieregg, Abigail G., additional, Wissel, Stephanie, additional, and Zas, Enrique, additional
Published: 2023
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49. Concept and analysis for a 1-10 PeV Tau Neutrino observatory

Author: Romero-Wolf, Andres, Carvalho, Washington, Alvarez-Muniz, Jaime, Cummings, Austin, Schoorlemmer, Harm, Wissel, Stephanie, and Zas, Enrique
Published: 2019

50. Concept and analysis for a 1-10 PeV Tau Neutrino observatory

Author: Zas, Enrique, Wissel, Stephanie, Schoorlemmer, Harm, Cummings, Austin, Alvarez-Muniz, Jaime, Carvalho, Washington, and Romero-Wolf, Andres
Abstract: UNKNOWN
Published: 2019

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