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CATEGORIES:HEP phenomenology joint Cavendish-DAMTP seminar
SUMMARY:Improved determination of |V_{cs}| from precision 
 lattice QCD calculation of D to K semileptonic dec
 ay form factors - Bipasha Chakraborty (DAMTP)
DTSTART;TZID=Europe/London:20211126T150000
DTEND;TZID=Europe/London:20211126T160000
UID:TALK159808AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/159808
DESCRIPTION:*The seminar will take place via Zoom "here":https
 ://maths-cam-ac-uk.zoom.us/j/95215212460?pwd=TWN5c
 jJ3azErSUYremw5UWRKL0NKUT09.*\n\nAbstract: The qua
 rk flavor sector of the Standard Model is a fertil
 e ground to look for new physics effects through a
  unitarity test of the Cabbibo-Kobayashi-Maskawa (
 CKM) matrix. The uncertainties in the unitarity ch
 ecks of the second row and second column of the CK
 M matrix are dominated by that of the central CKM 
 matrix element\, |V_{cs}|. This element is calcula
 ted from the studies of the leptonic and semilepto
 nic meson decays involving charged quark flavour c
 hanging current from charm to strange by combining
  the experimental decay rate with the vector form 
 factor calculated from lattice QCD. In this talk\,
  I would present our (HPQCD) latest high precision
  lattice QCD calculation (Phys.Rev.D 104\, 034505)
  of the scalar and the vector form factors for the
  D meson to K meson semi-leptonic decay over the f
 ull kinetic (q^2) range of the physical decay proc
 ess. This calculation allows us to precisely deter
 mine |V_{cs}| in the Standard Model\, by comparing
  the lattice QCD result for the vector form factor
 s and the experimental decay rate. This is the fir
 st time that |V_{cs}| has been determined with an 
 accuracy that allows its difference from 1 to be s
 een.
LOCATION:Potter Room (B1.19)
CONTACT:Rene Poncelet
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