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Semileptonic decays of K and D mesons in 2+1 flavor QCD

The experimentally measured rates of the semileptonic decays K -> pi l nu and D -> K(pi) l nu can be combined with lattice calculations of the associated form factors to precisely extract the CKM matrix elements |V_{us}| and |V_{cs(d)}|. We report on the status of form factor calculations with Fermilab charm quarks and staggered light quarks on the 2+1 flavor asqtad staggered MILC ensembles. Analysis of data for the D -> pi l nu form factor provides a nontrivial test of our methods via comparison with CLEO data. We discuss the use of HISQ valence quarks to calculate the K -> pi l nu form factor f_+^{K pi}(0) and describe tests of our method.

preprint2010arXivOpen access
Jon A. BaileyA. BazavovC. BernardC. M. BouchardC. DeTarA. X. El-KhadraE. D. FreelandE. GamizSteven GottliebU. M. HellerJ. E. HetrickA. S. KronfeldJ. LaihoL. LevkovaP. B. MackenzieM. B. OktayJ. N. SimoneR. SugarD. ToussaintR. S. van de Water
hep-exhep-phhep-lat
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Open access20 authors3 topics
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Jon A. BaileyA. BazavovC. BernardC. M. BouchardC. DeTarA. X. El-KhadraE. D. FreelandE. GamizSteven GottliebU. M. HellerJ. E. HetrickA. S. KronfeldJ. LaihoL. LevkovaP. B. MackenzieM. B. OktayJ. N. SimoneR. SugarD. ToussaintR. S. van de Water

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