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SUMMARY:N_2-dominated leptogenesis - Dr. Pasquale Di Bari (Southampton)
DTSTART:20100506T150000Z
DTEND:20100506T160000Z
UID:TALK24268@talks.cam.ac.uk
CONTACT:Steve Chun Hay Kom
DESCRIPTION:In my talk I will discuss a scenario of minimal leptogenesis (
 thermal + type I seesaw mechanism) that is interesting because potentially
  testable in future low energy neutrino experiments.  In the last years it
  become clear that a reliable calculation of the final asymmetry in leptog
 enesis has in general to take into account the contribution produced from 
 the heavier RH neutrino decays. In particular the contribution from the ne
 xt-to-lightest RH neutrinos (the "N_2" neutrinos) decays can be the domina
 nt source when the RH neutrino\nmass spectrum exhibits a strong hierarchy 
 and the lightest RH neutrino N_1 is sufficiently light to give a negligibl
 e contribution to the final asymmetry.  Interestingly\, this scenario can 
 be motivated within grand unified theories. In this case further restricti
 ons can be imposed on the seesaw parameters such that the final asymmetry 
 can be expressed in terms just of the low energy neutrino parameters.  Fur
 thermore\, imposing successful leptogenesis can potentially yield predicti
 ons on the low energy neutrino parameters.  I will also show how recently 
 studied  effects\, flavour coupling and phantom leptogenesis\,\ncan also r
 emarkably influence the final result and have therefore to be taken into a
 ccount.
LOCATION:Seminar Room B\, Rutherford Building\, Cavendish Laboratory
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