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SUMMARY:Improved determination of |V_{cs}| from precision lattice QCD calc
 ulation of D to K semileptonic decay form factors - Bipasha Chakraborty (D
 AMTP)
DTSTART:20211126T150000Z
DTEND:20211126T160000Z
UID:TALK159808@talks.cam.ac.uk
CONTACT:Rene Poncelet
DESCRIPTION:*The seminar will take place via Zoom "here":https://maths-cam
 -ac-uk.zoom.us/j/95215212460?pwd=TWN5cjJ3azErSUYremw5UWRKL0NKUT09.*\n\nAbs
 tract: The quark flavor sector of the Standard Model is a fertile ground t
 o look for new physics effects through a unitarity test of the Cabbibo-Kob
 ayashi-Maskawa (CKM) matrix. The uncertainties in the unitarity checks of 
 the second row and second column of the CKM matrix are dominated by that o
 f the central CKM matrix element\, |V_{cs}|. This element is calculated fr
 om the studies of the leptonic and semileptonic meson decays involving cha
 rged quark flavour changing current from charm to strange by combining the
  experimental decay rate with the vector form factor calculated from latti
 ce QCD. In this talk\, I would present our (HPQCD) latest high precision l
 attice QCD calculation (Phys.Rev.D 104\, 034505) of the scalar and the vec
 tor form factors for the D meson to K meson semi-leptonic decay over the f
 ull kinetic (q^2) range of the physical decay process. This calculation al
 lows us to precisely determine |V_{cs}| in the Standard Model\, by compari
 ng the lattice QCD result for the vector form factors and the experimental
  decay rate. This is the first time that |V_{cs}| has been determined with
  an accuracy that allows its difference from 1 to be seen.
LOCATION:Potter Room (B1.19)
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