Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-05-04
Phys.Rev. D63 (2001) 043003
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages Latex2e file including 4 postscript figures. Effect of brane fluctuation taken into account
Scientific paper
10.1103/PhysRevD.63.043003
If the neutrinos are to be identified with the primary source of ultra-high energy cosmic rays(UHECR), their interaction on relic neutrinos is of great importance in understanding their long intergalactic journey. In theories with large compact dimensions, the exchange of a tower of massive spin-2 gravitons (Kaluza-Klein excitations) gives extra contribution to $\nu\bar{\nu} \longrightarrow f\bar{f}$ and $\gamma\gamma$ processes along with the opening of a new channel for the neutrinos to annihilate with the relic cosmic neutrino background $\nu\bar{\nu} \longrightarrow G_{kk}$ to produce bulk gravitons in the extra dimensions. This will affect their attenuation. We compute the contribution of these Kaluza-Klein excitations to the above processes and find that for parameters of the theory constrained by supernova cooling, the contribution does indeed become the dominant contribution above $\sqrt{s} \simeq 300$ GeV.
Goyal Ashok
Gupta Abhinav
Mahajan Namit
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