BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//LBNL Physics Division Research Progress Meetings - ECPv6.8.3//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-ORIGINAL-URL:https://rpm.physics.lbl.gov
X-WR-CALDESC:Events for LBNL Physics Division Research Progress Meetings
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:UTC
BEGIN:STANDARD
TZOFFSETFROM:+0000
TZOFFSETTO:+0000
TZNAME:UTC
DTSTART:20260101T000000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=UTC:20260901T160000
DTEND;TZID=UTC:20260901T170000
DTSTAMP:20260902T092438
CREATED:20260824T180517Z
LAST-MODIFIED:20260824T180517Z
UID:3159-1788278400-1788282000@rpm.physics.lbl.gov
SUMMARY:Speaker: Diego Tonelli (INFN) - Title: First measurement of decay-time-dependent CP violation in B0->pi0pi0 decays
DESCRIPTION:Research Progress Meeting \nDate: September 1\, 2026 \nTime: 4:00- 5:00 pm \nLocation: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]  \nSpeaker: Diego Tonelli (INFN) \nTitle: First measurement of decay-time-dependent CP violation in B0->pi0pi0 decays \nAbstract: The Belle II experiment at the SuperKEKB e+e- collider is pushing the intensity frontier with unprecedented instantaneous luminosities. With the world’s largest Y(4S) data set\, the experiment combines abundant data\, advanced detector performance\, and novel analysis methods to open new opportunities to advance quark-flavor physics. I report the first measurement of mixing-induced charge-parity (CP) violation in B^0 \to \pi^0 \pi^0 decays\, a critical input for constraining the quark-mixing angle \phi_2 ( or \alpha). While traditionally deemed impossible without an order of magnitude more data\, this measurement is achieved using a novel technique enabled by the SuperKEKB large-crossing angle\, small interaction region and the Belle II pixel detector’s vertex resolution. By exploiting the quantum entanglement of the B^0B^0-bar pair from \Upsilon(4S) decays\, the method uses only the companion B decay time to infer the signal CP parity.\nUsing 170 signal events reconstructed from a 0.4 ab^-1 sample\, we determine the mixing-induced CP asymmetry\, significantly improving \phi_2 constraints from B \to \pi \pi\ decays. This technique unlocks future time-dependent CP-violation measurements for final states without reconstructible decay vertices.\n \nJoin Zoom Meeting\nhttps://lbnl.zoom.us/j/95679892182?pwd=RU5xU2dDRFNabnR1U3pQMklkYWFIdz09 \nMeeting ID: 956 7989 2182 \nPasscode: 169037
URL:https://rpm.physics.lbl.gov/event/speaker-diego-tonelli-infn-title-first-measurement-of-decay-time-dependent-cp-violation-in-b0-pi0pi0-decays/
LOCATION:ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260917T160000
DTEND;TZID=UTC:20260917T170000
DTSTAMP:20260902T092438
CREATED:20260901T173047Z
LAST-MODIFIED:20260901T173047Z
UID:3165-1789660800-1789664400@rpm.physics.lbl.gov
SUMMARY:Speakers: Simon Knapen and Jens Osterhoff (LBNL) - Title: The physics of high energy plasma wakefield colliders.
DESCRIPTION:Research Progress Meeting \nDate: September 17\, 2026 \nTime: 4:00- 5:00 pm \nLocation: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]  \nSpeaker: Simon Knapen and Jens Osterhoff (LBNL) \nTitle: The physics of high energy plasma wakefield colliders. \nAbstract: We report on a joint Physics–ATAP study on the requirements for future plasma wakefield colliders. A central element of the study is detailed particle-in-cell modeling of the beam–beam interaction\, which characterizes beamstrahlung\, disruption\, pair production\, and the luminosity spectrum under the extreme beam parameters. These results feed directly into progress on detector concepts capable of operating in the resulting backgrounds. We will also summarize the developing physics case that sets the energy and luminosity targets. Because positron acceleration in plasma remains the a severe open problem\, we study e⁻e⁻\, γγ\, and e⁺e⁻ options on equal footing. \nhttps://lbnl.zoom.us/j/98854322464?pwd=K2tKUm1VZjRlV1J5RHE3cXdHQzRxdz09 \nMeeting ID: 988 5432 2464\n\nPasscode: 142239
URL:https://rpm.physics.lbl.gov/event/speakers-simon-knapen-and-jens-osterhoff-lbnl-title-the-physics-of-high-energy-plasma-wakefield-colliders/
LOCATION:ca
END:VEVENT
END:VCALENDAR