Estimating γ γ
Related Concepts
Physics
Hadron
Lepton
Opacity
Energy (signal processing)
Particle physics
Absorption (acoustics)
Nuclear physics
Quantum mechanics
Optics
Electron
Giorgio Galanti
,
F. Piccinini
,
M. Roncadelli
,
F. Tavecchio
·
YOU?
·
· 2020
· Open Access
·
· DOI: https://doi.org/10.1103/physrevd.102.123004
· OA: W2996082703
YOU?
·
· 2020
· Open Access
·
· DOI: https://doi.org/10.1103/physrevd.102.123004
· OA: W2996082703
Surprisingly, the contribution to the cosmic opacity to UHE ($E>10^{18} \\,\n\\rm eV$) $\\gamma$-rays has been systematically computed so far for the $\\gamma\n\\gamma \\to e^+e^-$ and $\\gamma \\gamma \\to e^+ e^- e^+ e^-$ processes alone. We\ngo a step further by systematically evaluating the additional opacity brought\nabout by other leptons and hadrons. We find that the dominant channels are\nthose leading to the production of $\\mu^{\\pm}$ and hadrons (mainly $\\pi^{\\pm}$,\n$\\pi^0$, $K^{\\pm}$, $K^0$, $\\eta$). For nearly the GZK radius, the photon\nsurvival probability becomes smaller by about a factor of two with respect to\ncurrent estimates.\n
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