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DTSTART;TZID=Europe/Ljubljana:20250619T153000
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SUMMARY:Misha Gorshteyn: Cabibbo unitarity: anomaly (dis)appears
DESCRIPTION:Unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) quark mixing matrix is one of the cornerstones of the Standard Model. \nThe unitarity constraint that involves the top-row matrix elements\, $|V_{ud}|^2+|V_{us}|^2+|V_{ub}|^2=1$ is particularly \nimportant because all elements are measured very precisely permitting a test at the 0.01% level. At this accuracy\, \n$V_{ub}sim10^{-3}$ is irrelevant\, and the unitarity constraint reduces to the two-flavor Cabibbo unitarity pattern with a single \nCabibbo angle $theta_C$ and $V_{ud}=costheta_C$ and $V_{us}$. At present\, a mild deficit is observed\, \n$|V_{ud}|^2+|V_{us}|^2=0.9985(7)$. As such\, this deficit may suggest some new physics\, but to make this claim all Standard \nModel ingredients must be firmly under control. I review these ingredients across theory and experiment and review the most \nrecent developments.\nhttps://indico.ijs.si/event/2861/
URL:https://web-f1.ijs.si/event/misha-gorshteyn/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (A/1-106 – Seminarska soba fizike (F5))
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