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# 36th Annual International Symposium on Lattice Field Theory

22-28 July 2018
Kellogg Hotel and Conference Center
EST timezone

## Calculation of $K \to \pi l \nu$ form factor in $N_f = 2+1$ QCD at physical point on $(10 {\rm fm})^3$ volume

Jul 25, 2018, 2:20 PM
20m
103 (Kellogg Hotel and Conference Center)

### 103

#### Kellogg Hotel and Conference Center

219 S Harrison Rd, East Lansing, MI 48824
Weak Decays and Matrix Elements

### Speaker

Mr Junpei Kakazu (Univ. of Tsukuba)

### Description

We present our preliminary result of the form factor of $K \to \pi l \nu$ semileptonic decays on the large volume configuration, $L \approx 10$ fm, with the physical $m_{\pi}$ and $m_{K}$ using the stout-smearing clover quark and Iwasaki gauge actions at $a^{-1}=2.333$ GeV. From an interpolation using the data in small momentum transfers, we determine the semileptonic decay form factors at zero momentum transfer. The result is compared with the previous lattice calculations. We also estimate the value of $|V_{us}|$ by combining our result with the experimental value of the kaon semileptonic decay.

### Primary author

Mr Junpei Kakazu (Univ. of Tsukuba)

### Co-authors

Dr Ken-Ichi Ishikawa (Graduate School of Science, Hiroshima University) Dr Naruhito Ishizuka (CCS University of Tsukuba) Takeshi Yamazaki (Univerity of Tsukuba) Prof. Yoshinobu Kuramashi (University of Tsukuba) Dr Yusuke Namekawa (University of Tsukuba) Prof. Yusuke Taniguchi (University of Tsukuba) naoya ukita (Tsukuba University) Dr tomoteru yoshie (CCS University of Tsukuba) Dr yoshifumi Nakamura (RIKEN CCS)

 Slides