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- W2947482308 abstract "We revisit the estimate of cosmic opacity to ultra-high energy (UHE) $gamma$ rays ($E>10^{18}$ eV) considering, besides the $gamma gamma to e^+e^-$ and $gamma gamma to e^+ e^- e^+ e^-$ processes, the production of other leptons ($l$) and quarks ($q$). The most important channels are those leading to the production of light $qbar{q}$ ($q=u,d$) followed by hadronization and $mu^{pm}$, while the production of $tau^{pm}$ and $sbar{s}$, $cbar{c}$ followed by hadronization are subdominant. We consider also the single neutral meson production but it does not play a significant role. We recalculate the optical depth by considering all these processes, and we find that at UHE absorption is currently underestimated. For a distance $simeq 130$ Mpc (approximately equal to the GZK radius) the photon survival probability is smaller by about one order of magnitude with respect to the current estimates." @default.
- W2947482308 created "2019-06-07" @default.
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- W2947482308 date "2019-05-31" @default.
- W2947482308 modified "2023-09-27" @default.
- W2947482308 title "Revisiting $gammagamma$ absorption for UHE photons with $lbar{l}$ and $qbar{q}$ production" @default.
- W2947482308 hasPublicationYear "2019" @default.
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