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X-ORIGINAL-URL:https://w3.lnf.infn.it
X-WR-CALDESC:Eventi per INFN-LNF
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TZID:Europe/Rome
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TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20190331T010000
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TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20191027T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191127T110000
DTEND;TZID=Europe/Rome:20191127T130000
DTSTAMP:20260910T023918
CREATED:20191105T184733Z
LAST-MODIFIED:20191204T184743Z
UID:21228-1574852400-1574859600@w3.lnf.infn.it
SUMMARY:Some new ideas in Leptogenesis and Dark Matter studies
DESCRIPTION:Type-1 seesaw is the simplest extension of the Standard Model (SM) that explains light neutrino masses and baryon asymmetry of the universe (BAU) via leptogenesis. In the first part of this talk\, I shall discuss how different seesaw models can be visualised graphically and how a fine-tuning in the seesaw formula can be related to a Lorentz boost in the flavour space. I shall discuss a new parametrization of standard Casas-Ibarra orthogonal matrix and show how this new parametrisation is more useful in leptogenesis studies\, particularly in SO (10) models. In the second part\, I will show that an additional right handed (RH) neutrino could be a DM candidate in the two RH neutrino seesaw model if one considers the new one interacts with the other two with an effective dimension 5 operator induced by SM Higgs. This operator creates a temperature dependent matter potential and therefore the DM (the new RH neutrino) is produced from RH neutrino oscillation due to MSW-like matter effect even if the scale of new physics is post-Planckian. The operator responsible for DM production also causes the DM decay (to light neutrinos) and makes the scenario testable at neutrino telescopes such as IceCube.
URL:/event/some-new-ideas-in-leptogenesis-and-dark-matter-studies/
LOCATION:Aula Salvini
CATEGORIES:Seminari teorici
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191127T120000
DTEND;TZID=Europe/Rome:20191127T140000
DTSTAMP:20260910T023918
CREATED:20191107T184737Z
LAST-MODIFIED:20191204T184743Z
UID:21240-1574856000-1574863200@w3.lnf.infn.it
SUMMARY:Global fits to b → cτν transitions
DESCRIPTION:We perform a general model-independent analysis of b → cτντ transitions\, including measurements of RD \, RD∗ \, their q2 differential distributions\, the recently measured longitudinal D∗ polarization FD∗\, and constraints from the Bc → τντ lifetime\, each L of which has significant impact on the fit. A global fit to a general set of Wilson coefficients of an effective low-energy Hamiltonian is presented\, the solutions of which are interpreted in terms of hypothetical new-physics mediators. From the obtained results we predict selected b → cτντ observables\, such as the baryonic transition Λb → Λcτντ\, the ratio RJ/ψ\, the forward-backward asymmetries AD(∗)\, FB the τ polarization asymmetries PD(∗) \, and the longitudinal D∗ polarization fraction τ F D∗ . The latter shows presently a slight tension with any new-physics model\, such L that an improved measurement could have an important impact.  \n 
URL:/event/global-fits-to-b-%e2%86%92-c%cf%84%ce%bd-transitions/
LOCATION:Aula Salvini
CATEGORIES:Seminari teorici
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