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SUMMARY:First measurement of mixing-induced CP violation in B0→π0π0 de
 cays
DTSTART:20260623T090000Z
DTEND:20260623T100000Z
DTSTAMP:20260618T221700Z
UID:indico-event-1699292@indico.cern.ch
CONTACT:EP-seminars.colloquia@cern.ch
DESCRIPTION:Speakers: Mirco Dorigo (INFN Trieste)\n\n \n\n\n\n\n\n\n\n\n\
 n\nBelle II at the SuperKEKB asymmetric-energy e+e− collider is pushing 
 the intensity frontier with unprecedented instantaneous luminosities. Havi
 ng recently surpassed the Belle data sample\, Belle II is entering a new p
 hase in which growing statistics\, state-of-the-art detector performance\,
  and novel analysis techniques are opening new opportunities for precision
  flavour physics. \nWe present the first measurement of mixing-induced ch
 arge-parity (CP) violation in B0→π0π0 decays\, a key input to the isos
 pin determination of the CKM angle φ2/α from B→ππ transitions. Acces
 sing decay-time-dependent CP violation in B0→π0π0 decays had long been
  considered remote: the conventional method would require rare π0→e+e
 −γ topologies to reconstruct the signal decay position\, and therefore 
 data samples of O(10) ab−1. We overcome this limitation with a new appro
 ach that exploits the quantum entanglement of the B0B0-bar pair produced i
 n Υ(4S) decays\, using only the tag-side B decay time to access the signa
 l time evolution.\nWith 0.4 ab−1\, we determine the mixing-induced CP-vi
 olating parameter in B0→π0π0 decays and significantly improve the φ2/
 α constraint from B→ππ. Enabled by the SuperKEKB nanobeam scheme and 
 the excellent vertex resolution of the Belle II pixel detector\, the metho
 d opens a new route to time-dependent CP-violation studies in final states
  without a reconstructible decay vertex.\n\n\n \n\n\n\n\n\n\n\n\n \nRefr
 eshments will be served at 10:30\n \n\nhttps://indico.cern.ch/event/16992
 92/\n\nZoom: https://cern.zoom.us/j/64762461058?pwd=iVals1yOd1FdaFFWG4yWsG
 OTDuhAqz.1
LOCATION:500/1-001 - Main Auditorium (CERN)
URL:https://indico.cern.ch/event/1699292/
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