Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-06-04
JHEP 0901:051,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages ; v3: discussion about resonant leptogenesis case added ; matches JHEP published version
Scientific paper
10.1088/1126-6708/2009/01/051
It is well known that the leptogenesis mechanism offers an attractive possibility to explain the baryon asymmetry of the universe. Its particular robustness however comes with one major difficulty: it will be very hard if not impossible to test experimentally in a foreseeable future, as most of the mechanics typically takes place at high energy or results from suppressed interactions, without unavoidable low-energy implications. An alternate approach is taken by asking: can it be at least falsified? We show that possible discoveries at current and future colliders, most notably that of right-handed gauge interactions, would indeed forbid at least the "canonical" leptogenesis mechanisms, namely those based on right-handed neutrino decay. General lower bounds for successful leptogenesis on the mass of the right-handed gauge boson W_R are given. Other possibilities to falsify leptogenesis, including from the observation of a Z', are also considered.
Frere Jean-Marie
Hambye Thomas
Vertongen Gilles
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