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SUMMARY:Impact of Observing Lepton Number Violation on Models of Baryogene
 sis - Julia Harz (UPMC\,Paris)
DTSTART:20160226T160000Z
DTEND:20160226T170000Z
UID:TALK63818@talks.cam.ac.uk
CONTACT:Marco Nardecchia
DESCRIPTION:Different observations point us to physics beyond the Standard
  Model\,\nfor example the baryon asymmetry of the Universe. While a variet
 y of\nsuccessful models has been proposed\, it is worthwhile to think abou
 t\npossibilities of narrowing down these options and to proceed in the\nqu
 estion which mechanism is realised in nature.\nAfter a brief introduction\
 , I will discuss why interactions that\nmanifest themselves as lepton numb
 er violating processes at low energies\nin combination with sphaleron tran
 sitions typically washout any\npre-existing baryon asymmetry of the Univer
 se. Based on this\, I will\ndemonstrate that the observation of lepton num
 ber violating processes\nwill set stringent limits on models of high-scale
  baryogenesis.\nFirst\, I will discuss the potential of the LHC to model i
 ndependently\nexclude high-scale leptogenesis scenarios when observing lep
 ton number\nviolating processes. Further\, I will demonstrate in a model i
 ndependent\napproach that the observation of neutrinoless double beta deca
 y\ntriggered via a non-standard mechanism would as well impose a stringent
 \nconstraint on mechanisms of high-scale baryogenesis. Finally\, I will\ns
 how that in combination with the observation of lepton flavor violating\np
 rocesses\, the argument can be further strengthened\, closing the\nloophol
 e of asymmetries being stored in different lepton flavors.\n
LOCATION:Seminar Room B\, Rutherford Building\, Cavendish Laboratory
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