BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//LAPTh - ECPv6.15.17//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:LAPTh
X-ORIGINAL-URL:https://www.lapth.cnrs.fr
X-WR-CALDESC:Évènements pour LAPTh
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Europe/Paris
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20210328T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20211031T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20220327T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20221030T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20230326T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20231029T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220614T110000
DTEND;TZID=Europe/Paris:20220614T120000
DTSTAMP:20260408T044028
CREATED:20220620T162949Z
LAST-MODIFIED:20220620T162949Z
UID:7797-1655204400-1655208000@www.lapth.cnrs.fr
SUMMARY:[Journal Club] A novel theoretical approach to $R(D^{(*)})$ through the Dispersive Matrix method
DESCRIPTION:Abstract:  \nThe ratios $R(D^{(*)})$ are defined as the $tau/mu$ ratio of the branching fractions of exclusive semileptonic $B to D^{(*)}$ decays. They are a powerful test of Lepton Flavour Universality\, one of the pillars of the SM\, and are determined by the hadronic Form Factors (FFs) describing the $B to D^{(*)}$ decays. Through the novel Dispersive Matrix (DM) approach\, we describe these FFs without assumptions on their functional dependence on the momentum transfer. The DM method is based on the non-perturbative determination of the dispersive bounds due to unitarity and analyticity\, and allows to determine in a model-independent way the FFs in the full kinematical range\, starting from existing Lattice QCD data which are available only at large momentum transfer. Using the unitarity bands of the FFs\, which are thus independent of the experimental determinations of the differential decay widths\, we compute new fully-theoretical expectations of the anomalies. Our results read $R(D) = 0.296(8)$ and $R(D^*) = 0.275(8)$\, each of which is compatible with the corresponding world average of the measurements at the $sim 1.3 sigma$ level. The origin of the discrepancy between the DM estimates and the HFLAV SM predictions will be also discussed. \n  \nZoom link: \nhttps://cnrs.zoom.us/j/91049381574?pwd=TDZyU3NqT0k4MFk3cUMvc0JuOURCdz09
URL:https://www.lapth.cnrs.fr/event/journal-club-a-novel-theoretical-approach-to-rd-through-the-dispersive-matrix-method/
CATEGORIES:Upcoming Journal Club
END:VEVENT
END:VCALENDAR