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2013

K semileptonic form factor with HISQ fermions at the physical point

Gámiz, E., Bazavov, A., Bernard, C. et al.

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We present results for the form factor $f_+^{K \pi}(0)$, needed to extract the CKM matrix element $|V_{us}|$ from experimental data on semileptonic $K$ decays, on the HISQ $N_f=2+1+1$ MILC configurations.

The HISQ action is also used for the valence sector.
The data set used for our final result includes three different values of the lattice spacing and data at the physical light quark masses.
We discuss the error budget and how this calculation improves on our previous determination of $f_+^{K \pi}(0)$ on the asqtad $N_f=2+1$ MILC configurations.

K semileptonic form factor with HISQ fermions at the physical point · Around

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J. Gasser and H. Leutwyler, Nucl. Phys. B 250
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J. Bijnens, G. Colangelo and G. Ecker, JHEP 9902
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G. Amorós, J. Bijnens and P. Talavera, Nucl. Phys. B 602
2001
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C. Bernard [MILC Collaboration], Phys. Rev. D 65
2002
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J. Bijnens, P. Talavera, Nucl. Phys. B669
2003
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