Loading Events

Past Events

Events Search and Views Navigation

Event Views Navigation

June 2020

Beate Heinemann (DESY) “European Strategy for Particle Physics Update 2020”

June 25 @ 12:00 pm - 1:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
+ Google Map

Abstract: I will present the updated European strategy for particle physics which was announced by the CERN Council in June. The strategy was developed in a process that spanned two years and engaged both the European and the international community of particle physics, as well as related scientific disciplines. The highest-priority physics recommendations are the study of the Higgs boson and the exploration of the high-energy frontier: two crucial and complementary ways to address the open questions in particle physics.…

Find out more »

July 2020

Kyle Dawson (U. Utah) “The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory”

July 9 @ 4:00 pm - 5:00 pm
50-Auditorium

Abstract: The Extended Baryon Oscillation Spectroscopic Survey (eBOSS) concluded observations of the cosmic distance scale and the growth of structure in February, 2019.  The three dimensional clustering in all samples from the Sloan Digital Sky Survey (SDSS) was used to make 15 distinct, high precision measurements of Baryon Acoustic Oscillations (BAO) to an effective redshift z<2.4 and six measurements of redshift space distortions (RSD) to z<1.5.  With this redshift coverage and sensitivity, the SDSS experiment is unparalleled in its ability…

Find out more »

Zara Bagdasarian (UCB) “Solar Neutrinos with Borexino: First Evidence of CNO Fusion Cycle”

July 16 @ 4:00 pm - 5:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
+ Google Map

Abstract: The prime energy producer in the sun is the fusion of hydrogen to form helium. However, there is more than one way for this fusion to take place: for stars the size of the sun or smaller, the proton-proton (pp) chain reactions dominate (~99%), while in heavier stars, the carbon-nitrogen-oxygen (CNO) cycle is expected to play a more important role. Not only these fusion reactions would not have been possible without the emission of neutrinos, neutrinos are the only…

Find out more »

JOINT INPA/RPM Seminar | Michelle Galloway (University of Zurich) “Observation of excess electronic recoil events in XENON1T”

July 17 @ 10:00 am - 11:00 am
Zoom Talk, 50A-5132
Berkeley, ca 94720
+ Google Map

Abstract: A search for new physics with XENON1T revealed an excess of electronic recoil events in the (1 – 7) keV region, favoring signal over background with significances of 3.5 sigma for solar axions/ALPs, 3.2 sigma for an enhanced neutrino magnetic moment, and 3.0 sigma global (4.0 local) for bosonic dark matter with a peak at 2.3 +- 0.2 keV (68% C.L.). Additionally, a previously undetected tritium component, favoured at 3.2 sigma over known backgrounds, can neither be confirmed nor…

Find out more »

Josh McFayden (LBNL) “Unravelling LEP-Era Lepton Flavour Universality Discrepancy with ATLAS”

July 21 @ 12:00 pm - 1:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
+ Google Map

Abstract:  A remarkable feature of the Standard Model (SM) is that each lepton flavour (electron, muon, tau) is equally likely to interact with a W boson. This is known as Lepton Flavour Universality. In a recent ATLAS measurement, a novel technique using events with top-quark pairs has been exploited to test the ratio of the probabilities for tau leptons and muons to be produced in W boson decays, R(τ/μ). In the SM, R(τ/μ) is expected to be unity, but a longstanding tension…

Find out more »

September 2020

Yacine Ali-Haimoud (NYU) “Hunting for Dark Matter in the Early Universe”

September 10 @ 4:00 pm - 5:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
+ Google Map

ABSTRACT: It is now well established that the dominant part of non-relativistic matter in the Universe is some substance which appears to be oblivious to any force but gravity. The nature of this dark matter remains a nagging puzzle, and several candidates remain in the running. For instance, dark matter might be a new particle, as light as an electron, which might weakly interact with standard particles. Or it could be partly made of primordial black holes as massive as many Suns,…

Find out more »

Vivian Miranda (U. Arizona) “The Connected Universe: Relating Early, Intermediate and Late Universe with cosmological data”

September 24 @ 4:00 pm - 5:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
+ Google Map

Abstract: The standard model of cosmology is built upon on a series of propositions on how the early, intermediate, and late epochs of the Universe behave. In particular, it predicts that dark energy and dark matter currently pervades the cosmos. Understanding the properties of the dark sector is plausibly the biggest challenge in theoretical physics. There is, however, a broad assumption in cosmology that the Universe on its earlier stages is fully understood and that discrepancies between the standard model…

Find out more »

October 2020

Nan Lu (Caltech) “Evidence for Higgs Boson Decay to a Pair of Muons from the CMS Experiment “

October 1 @ 4:00 pm - 5:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
+ Google Map

Abstract: This seminar presents the search for the rare Higgs boson decay to a pair of muons performed by the CMS experiment at the LHC, based on the full Run 2 dataset. Events are categorized based on the characteristics of major Higgs boson production mechanisms and are analyzed using machine learning techniques, which significantly boosts the sensitivity of the search. A 3.0σ excess is observed in data, constituting the first evidence for the Higgs boson coupling to muons. http://physics.lbl.gov/rpm/index.php/events/ If you…

Find out more »

Andrej Obuljen (Waterloo) “Anisotropic Assembly Bias in Theory, Simulations and BOSS Data”

October 15 @ 4:00 pm - 5:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
+ Google Map

ABSTRACT Clustering of matter on large scales provides an important source of information on key cosmological parameters. To extract this information we need to understand the relation between the tracers we observe and the underlying matter field. The clustering strength of halos and galaxies on large scales is linearly biased compared to the matter clustering. This linear bias mainly depends on halo mass and redshifts, though selections based on other scalar halo properties (age, spin, concentration etc.) show additional bias…

Find out more »

Simone Pagan-Griso (LBNL) “The Future of the Energy Frontier: Highlights from the Snowmass 2021 Process”

October 22 @ 4:00 pm - 5:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
+ Google Map

Abstract: The Snowmass process is an opportunity for the entire HEP community to come together to identify and document a vision for the future of particle physics in the U.S. and its international partners. The Snowmass 2021 process is currently ongoing and scheduled to deliver a report in the fall of 2021. The work is divided in many areas (frontiers), spanning collider-based physics, neutrino physics, and cosmology, but including dedicated theory and instrumentation areas as well. In this seminar, I…

Find out more »
+ Export Events