Search for photons with energies above 1018 eV using the hybrid detector of the Pierre Auger Observatory

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F17%3A00479295" target="_blank" >RIV/68378271:_____/17:00479295 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/17:10371284 RIV/61989592:15310/17:73582099
Result on the web
<a href="http://dx.doi.org/10.1088/1475-7516/2017/04/009" target="_blank" >http://dx.doi.org/10.1088/1475-7516/2017/04/009</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1475-7516/2017/04/009" target="_blank" >10.1088/1475-7516/2017/04/009</a>

Result language
angličtina
Original language name
Search for photons with energies above 1018 eV using the hybrid detector of the Pierre Auger Observatory
Original language description
A search for ultra-high energy photons with energies above 1 EeV is performed using nine years of data collected by the Pierre Auger Observatory in hybrid operation mode. An unprecedented separation power between photon and hadron primaries is achieved by combining measurements of the longitudinal air-shower development with the particle content at ground measured by the fluorescence and surface detectors, respectively. Only three photon candidates at energies 1{2 EeV are found, which is compatible with the expected hadron-induced background. Upper limits on the integral flux of ultra-high energy photons of 0.027, 0.009, 0.008, 0.008 and 0.007 km(-2) sr(-1) yr(-1) are derived at 95% C.L. for energy thresholds of 1, 2, 3, 5 and 10 EeV. These limits bound the fractions of photons in the all-particle integral flux below 0.1%, 0.15%, 0.33%, 0.85% and 2.7%. For the first time the photon fraction at EeV energies is constrained at the sub-percent level.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10303 - Particles and field physics

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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