Seminars And Colloquia This Week

The Cryogenic Underground Observatory for Rare Events (CUORE) is a world leading cryogenic experiment searching for neutrinoless double beta decay (0vBB). CUORE is a one-tonne mass scale experiment, has been running since 2017, and has achieved statistics of one tonne-year worth of data taking. While no evidence of double beta decay has yet been found (with limit: T1/2 > 3.6 × 10^24 yr), CUORE can also be used to search for more exotic decay processes such as a triple proton decay. This talk will show how a data analysis framework built around machine learning can be used to classify different kinds of energy depositing events for counting experiments. A methodology which combines Poisson counting statistics with supervised classification machine learning tools is presented. Additionally, a sensitivity calculation is provided which uses the classification counting likelihood. Using the new analysis framework, we can achieve a preliminary lower 2σ half-life bound of 7.4×10^24yr for triple-proton decay of 130Te.

"For a long time, it was believed that the fundamental constituents of atoms were electrons and nucleons until experiments conducted in the late 1960s at Standford Linear Accelerator Center (SLAC) proved the existence of internal degrees of freedom in the nucleons. These ones are called quarks and gluons, or collectively partons. With QCD as the fundamental theory for strong interactions, we can describe hadronic structure via correlators of partons giving rise to the so-called parton distribution functions (PDFs) and generalized parton distributions (GPDs) when the so-called collinear factorization applies. The non-elementary nature of hadrons makes these correlators perturbatively unsolvable so we can only measure or model them. 

This seminar will cover the discovery of the proton as a composite object through deep inelastic scattering (DIS), from both the experimental and theoretical sides. Modern experiments/theory on other processes such as deeply virtual, timelike and double deeply virtual Compton scattering (DVCS, TCS and DDVCS) will be covered too, giving a broad picture on the current access to parton distributions."