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SUMMARY:Short- vs Long-Distance Dynamics in b-&gt\;sll Decays - Arianna Ti
 nari (Zurich U.)
DTSTART:20251010T150000Z
DTEND:20251010T160000Z
UID:TALK236200@talks.cam.ac.uk
CONTACT:Nico Gubernari
DESCRIPTION:Flavor-changing neutral current decays such as b->sll are high
 ly suppressed in the Standard Model (SM) and therefore provide sensitive t
 ests for new physics. The long-standing tension between SM predictions and
  experimental measurements in both branching ratios and angular observable
 s in b->sll decays can be attributed to a modification of the Wilson coeff
 icient C9 of the semileptonic effective operator O9 by approximately 20–
 25 % relative to its SM value. This deviation might originate from a short
 -distance b->sll contribution\, signaling new physics\, or from unaccounte
 d-for long-distance contributions within the SM\, arising from the non-loc
 al matrix elements of the four-quark operators. We discuss our current the
 oretical understanding of these non-local matrix elements\, focusing in pa
 rticular on rescattering contributions induced by intermediate D^(*) D^(*)
 _s states.
LOCATION:MR19 (Potter Room\, Pavilion B)\, CMS
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