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SUMMARY:Seminar\, 和田 淳太郎 Juntaro Wada (Tohoku University)
DTSTART;VALUE=DATE-TIME:20250508T043000Z
DTEND;VALUE=DATE-TIME:20250508T053000Z
UID:253682483079
DESCRIPTION:Title: Insights on the Scale of Leptogenesis from Neutrino Mas
 ses and Neutrinoless Double-Beta DecayAbstract: We revisit the thermal lep
 togenesis scenario in the type-I seesaw framework featuring three heavy Ma
 jorana neutrinos with a hierarchical mass spectrum. We focus on low energy
  observables\, specifically the lightest neutrino mass $\\mnulight$ and th
 e neutrinoless double-beta decay effective mass parameter $m^{\\rm eff}_{\
 \beta\\beta}$. In particular\, we numerically calculate the minimum mass o
 f the lightest heavy Majorana neutrino\, $M_1^{\\rm min}$\, required for s
 uccessful leptogenesis as a function of $\\mnulight$ and $m^{\\rm eff}_{\\
 beta\\beta}$\, considering both normal and inverted light neutrino mass or
 derings.Flavour effects are taken into account within the flavoured densit
 y matrix formalism. We also examine the interplay between fine-tuned cance
 llations in the seesaw relation and $M_1^{\\rm min}$. Recent and forthcom
 ing searches for neutrinoless double-beta decay\, along with cosmological 
 probes of the sum of neutrino masses\, motivate this analysis\, as they ca
 n provide key insights into the minimal scale of thermal leptogenesis and 
 its broader implications.
LOCATION:721
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