Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-11-09
Phys.Rev. D71 (2005) 023510
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages; v2: bounds on the mass of the messenger particle are relaxed; conclusions unchanged. additional minor modifications
Scientific paper
10.1103/PhysRevD.71.023510
The measured densities of dark and baryonic matter are surprisingly close to each other, even though the baryon asymmetry and the dark matter are usually explained by unrelated mechanisms. We consider a scenario where the dark matter S is produced non-thermally from the decay of a messenger particle X, which carries the baryon number and compensates for the baryon asymmetry in the Universe, thereby establishing a connection between the baryonic and dark matter densities. We propose a simple model to realize this scenario, adding only a light singlet fermion S and a colored particle X which has a mass in the O(TeV) range and a lifetime to appear long-lived in collider detector. Therefore in hadron colliders the signal is similar to that of a stable or long-lived gluino in supersymmetric models.
Kitano Ryuichiro
Low Ian
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