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TZID:Europe/Rome
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TZOFFSETFROM:+0100
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TZNAME:CEST
DTSTART:20190331T010000
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TZOFFSETFROM:+0200
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TZNAME:CET
DTSTART:20191027T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191127T120000
DTEND;TZID=Europe/Rome:20191127T140000
DTSTAMP:20260422T073347
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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