BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Application of light-cone sum rules (LCSRs) to D(s)->Pl+l- decays
DTSTART:20250711T080000Z
DTEND:20250711T090000Z
DTSTAMP:20260518T065800Z
UID:indico-event-3853@indico.e5.physik.tu-dortmund.de
CONTACT:maik.becker@tu-dortmund.de\;serena.maccolini@cern.ch
DESCRIPTION:Speakers: Anshika Bansal (Universität Siegen)\n\n$D^+\\to \\p
 i^+\\ell^+\\ell^-$ decays are of much interest from the point of view of G
 IM cancellation and potential new sources of the FCNC $c\\to u$ transition
 s. The hadronic amplitude of this decay is dominated by the combination of
  weak annihilation with the emission of a virtual photon which are purely 
 long-distance effects.\nIn this talk\, I will discuss a new method to anal
 yse these decays\, combining QCD light-cone sum rules (LCSRs) with hadroni
 c dispersion relations. This method allows us to determine relative strong
  phases of the ρ-\,ω- and ϕ-meson resonances and to estimate of the con
 tributions of heavier hadronic states. The final results for $D^+\\to \\pi
 ^+\\ell^+\\ell^-$ width are obtained to be not much smaller than the curre
 nt upper bound measured by LHCb collaboration. In the later part of my tal
 k\, I will discuss the relations of these decays to other Cabibbo favoured
  and Cabbbo suppressed modes using U-spin symmetry. Finally\, I present re
 sults for Cabibbo-favoured modes\, $D_s^+\\to \\pi^+\\ell^+\\ell^-$ and $D
 ^0\\to \\bar{K}^0\\ell^+\\ell^-$\, which proceed via the same weak annihil
 ation mechanism as a byproduct of our analysis.\nThe seminar will take pla
 ce in P2-04-410\n\nhttps://indico.e5.physik.tu-dortmund.de/event/3853/
LOCATION:P2-04-410 (TU Dortmund)
URL:https://indico.e5.physik.tu-dortmund.de/event/3853/
END:VEVENT
END:VCALENDAR