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PRODID:-//LBNL Physics Division Research Progress Meetings - ECPv6.8.3//NONSGML v1.0//EN
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X-ORIGINAL-URL:https://rpm.physics.lbl.gov
X-WR-CALDESC:Events for LBNL Physics Division Research Progress Meetings
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TZID:UTC
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DTSTART:20240101T000000
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BEGIN:VEVENT
DTSTART;TZID=UTC:20241003T160000
DTEND;TZID=UTC:20241003T170000
DTSTAMP:20260414T141813
CREATED:20240930T135057Z
LAST-MODIFIED:20240930T135057Z
UID:2663-1727971200-1727974800@rpm.physics.lbl.gov
SUMMARY:Speaker: Simone Pagan Griso (LBNL) - Title: How a 10 TeV muon collider could be in the particle-physics future
DESCRIPTION:Research Progress Meeting \nDate: October 3\, 2024 \nTime: 4:00- 5:00 pm \nLocation: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]  \nSpeaker: Simone Pagan Griso (LBNL) \nTitle: How a 10 TeV muon collider could be in the particle-physics future\n \nAbstract: A Muon Collider offers the potential for a scalable path towards the next generation of high-energy frontier particle colliders. A 10 TeV center-of-mass collider would allow us to study the Standard Model of particle physics in regimes qualitatively different from what we have been able to explore so far.\nAt the same time\, the short life-time of the muon poses non-trivial technical challenges on both the accelerator and detector design. The last P5 report recognized the high-gain possible from such a machine and refers to that as “the muon shot”.\nWhile studies towards a muon collider have been done for decades\, at various degrees of emphasis\, the feasibility studies towards a 10 TeV machine have ramped up and caught more and more attention in the last few years\, fueled also by the current technology possibilities and the state of the field.\nThe compact design also offers the possibility of hosting such a collider on the Fermilab site\, which has contributed to increase more and more domestic interest as well.\nA recent workshop held at Fermilab also started the discussion of forming a US-based Muon Collider organization\,in cooperation with the international Muon Collider Collaboration.\nIn this seminar I will take the occasion of this recent workshop to give to the local crowd a quick overview of the physics case and the state of the design for the accelerator complex and detectors for such a collider\, focusing on the technical opportunities and challenges ahead to make this dream-project a reality. \nJoin Zoom Meeting \nhttps://lbnl.zoom.us/j/98854322464?pwd=K2tKUm1VZjRlV1J5RHE3cXdHQzRxdz09\n\nMeeting ID: 988 5432 2464\n\nPasscode: 142239
URL:https://rpm.physics.lbl.gov/event/speaker-simone-pagan-griso-lbnl-title-how-a-10-tev-muon-collider-could-be-in-the-particle-physics-future/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20241010T160000
DTEND;TZID=UTC:20241010T170000
DTSTAMP:20260414T141813
CREATED:20241003T163837Z
LAST-MODIFIED:20241003T163837Z
UID:2669-1728576000-1728579600@rpm.physics.lbl.gov
SUMMARY:Speaker: Ibles Olcina Samblas (LBNL) - Title: New constraints on WIMP dark matter from the LUX-ZEPLIN (LZ) experiment
DESCRIPTION:Research Progress Meeting \nDate: October 10\, 2024 \nTime: 4:00- 5:00 pm \nLocation: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]  \nSpeaker: Ibles Olcina Samblas (LBNL) \nTitle: New constraints on WIMP dark matter from the LUX-ZEPLIN (LZ) experiment \nAbstract: Dark matter detection experiments based on liquid xenon time projection chambers (TPC) have been steadily increasing in sensitivity to the weakly interacting massive particle (WIMP) over the past two decades. The LUX-ZEPLIN (LZ) experiment\, employing a two-phase xenon TPC containing 7 tonnes of liquid xenon\, leads the way. Recently\, the collaboration released new results from a combined analysis using data from the 2022 and 2024 science campaigns\, amounting to an exposure of 4.2 tonne-years. No evidence for an excess over expected backgrounds was found across all the test WIMP masses. The resulting limit on the spin-independent WIMP-nucleon cross section is world-leading for masses above 9 GeV/c2\, surpassing previous best limits by about a factor of four. In this talk\, I will describe the new LZ results—including a new technique to actively tag background electronic recoils from Pb-214 beta decays\, the observation of charge-suppressed two-neutrino double electron capture events from Xe-124 decays\, and the bias mitigation technique called “salting”—and briefly discuss what is on the horizon for the liquid xenon TPC community. \nJoin Zoom Meeting \nhttps://lbnl.zoom.us/j/98854322464?pwd=K2tKUm1VZjRlV1J5RHE3cXdHQzRxdz09\n\nMeeting ID: 988 5432 2464\n\nPasscode: 142239
URL:https://rpm.physics.lbl.gov/event/speaker-ibles-olcina-samblas-lbnl-title-new-constraints-on-wimp-dark-matter-from-the-lux-zeplin-lz-experiment/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20241022T160000
DTEND;TZID=UTC:20241022T170000
DTSTAMP:20260414T141813
CREATED:20241017T213555Z
LAST-MODIFIED:20241017T213555Z
UID:2677-1729612800-1729616400@rpm.physics.lbl.gov
SUMMARY:Speaker: Julien Carron (UNIGE) - Title: Delensing the Cosmic Microwave Background
DESCRIPTION:Research Progress Meeting \nDate: October 22\, 2024 \nTime: 4:00- 5:00 pm  \nLocation: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]  \nSpeaker: Julien Carron (UNIGE) \nTitle: Delensing the Cosmic Microwave Background \nAbstract: Gravitational lensing of the Cosmic Microwave Background is a very valuable cosmological signal\, detected at very high significance by several experiments.  At the same time\, it has also become an hindrance to some important science goals of CMB experiments\,  most notably for best constraints on a primordial background of gravitational waves. After reviewing current lensing estimation techniques and recent results\, I’ll discuss how removal of the lensing signal (`delensing’) typically helps measuring small parameters that affects the CMB polarization. Very sensitive experiments must rely on novel more powerful algorithms to optimally extract or remove the lensing signal: I will present the approach developed in our group in Geneva\, together with its forecast performance for upcoming experiments\, notably CMB-S4. \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-julien-carron-unige-title-delensing-the-cosmic-microwave-background/
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BEGIN:VEVENT
DTSTART;TZID=UTC:20241024T160000
DTEND;TZID=UTC:20241024T170000
DTSTAMP:20260414T141813
CREATED:20241018T161446Z
LAST-MODIFIED:20241018T161446Z
UID:2681-1729785600-1729789200@rpm.physics.lbl.gov
SUMMARY:Speaker: Kaja Rotermund (LBNL) - Title: LuSEE-Night – the Dark Ages from the Far Side of the Moon
DESCRIPTION:Research Progress Meeting \nDate: October 24\, 2024 \nTime: 4:00- 5:00 pm \nLocation: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]  \nSpeaker: Kaja Rotermund\, LBNL \nTitle: LuSEE-Night – the Dark Ages from the Far Side of the Moon \nAbstract: The “Dark Ages” refers to the cosmic era between the last scattering of the cosmic microwave background and “Cosmic Dawn\,” the time when the first stars and galaxies formed. Only cold\, non-luminous hydrogen gas existed during the Dark Ages\, which emits at 21 cm (f = 1420 MHz). Through the expansion of the universe\, this signal has been redshifted to low radio frequencies that are inaccessible from earth due to distortions of our ionosphere and significant terrestrial radio-frequency interference. This era is therefore largely unexplored and remains one of the least constrained frontiers of modern cosmology. LuSEE-Night is a project that aims to make sensitive measurements across two decades in frequency space from the radio-quiet far side of the moon. In doing so\, LuSEE-Night will determine the feasibility of conducting radio-frequency astronomy from the lunar surface and acts as a pathfinder for larger missions in the future. \nJoin Zoom Meeting \nhttps://lbnl.zoom.us/j/98854322464?pwd=K2tKUm1VZjRlV1J5RHE3cXdHQzRxdz09\n\nMeeting ID: 988 5432 2464\n\nPasscode: 142239
URL:https://rpm.physics.lbl.gov/event/speaker-kaja-rotermund-lbnl-title-lusee-night-the-dark-ages-from-the-far-side-of-the-moon/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20241031T160000
DTEND;TZID=UTC:20241031T170000
DTSTAMP:20260414T141813
CREATED:20241002T173737Z
LAST-MODIFIED:20241002T173737Z
UID:2666-1730390400-1730394000@rpm.physics.lbl.gov
SUMMARY:Speaker: Vinicius Mikuni (LBNL) - Title: OmniLearn: A Method to Simultaneously Facilitate All Jet Physics Tasks
DESCRIPTION:Research Progress Meeting \nDate: October 31\, 2024 \nTime: 4:00- 5:00 pm \nLocation: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]  \nSpeaker: Vinicius Mikuni (LBNL) \nTitle: OmniLearn: A Method to Simultaneously Facilitate All Jet Physics Tasks \nAbstract: Machine learning has become an essential tool in the study of jets\, collimated sprays of particles emerging from strong force interactions. Due to their complex\, high-dimensional nature\, jets can be explored holistically by neural networks in ways that are not possible manually. However\, innovations in all areas of jet physics are proceeding in parallel. We show that specially constructed machine learning models trained for a specific jet classification task can improve the accuracy\, precision\, or speed of all other jet physics tasks. This is demonstrated by training on a particular multiclass generation and classification task and then using the learned representation for different generation and classification tasks\, for datasets with a different (full) detector simulation\, for jets from a different collision system (pp versus ep)\, for generative models\, for likelihood ratio estimation\, and for anomaly detection. Our OmniLearn approach is thus a foundation model and is made publicly available for use in any area where state-of-the-art precision is required for analyses involving jets and their substructure. \nJoin Zoom Meeting \nhttps://lbnl.zoom.us/j/98854322464?pwd=K2tKUm1VZjRlV1J5RHE3cXdHQzRxdz09\n\nMeeting ID: 988 5432 2464\n\nPasscode: 142239
URL:https://rpm.physics.lbl.gov/event/speaker-vinicius-mikuni-lbnl-title-omnilearn-a-method-to-simultaneously-facilitate-all-jet-physics-tasks/
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