$��$ Meson Decay in 2+1 Flavor Lattice QCD
| Autor: | CS Collaboration, Aoki, S., Ishikawa, K. I., Ishizuka, N., Kanaya, K., Kuramashi, Y., Namekawa, Y., Okawa, M., Taniguchi, Y., Ukawa, A., Ukita, N., Yamazaki, T., Yoshi��, T. |
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| Rok vydání: | 2011 |
| Předmět: | |
| DOI: | 10.48550/arxiv.1106.5365 |
| Popis: | We perform a lattice QCD study of the $��$ meson decay from the $N_f=2+1$ full QCD configurations generated with a renormalization group improved gauge action and a non-perturbatively $O(a)$-improved Wilson fermion action. The resonance parameters, the effective $��\to����$ coupling constant and the resonance mass, are estimated from the $P$-wave scattering phase shift for the isospin I=1 two-pion system. The finite size formulas are employed to calculate the phase shift from the energy on the lattice. Our calculations are carried out at two quark masses, $m_��=410\,{\rm MeV}$ ($m_��/m_��=0.46$) and $m_��=300\,{\rm MeV}$ ($m_��/m_��=0.35$), on a $32^3\times 64$ ($La=2.9\,{\rm fm}$) lattice at the lattice spacing $a=0.091\,{\rm fm}$. We compare our results at these two quark masses with those given in the previous works using $N_f=2$ full QCD configurations and the experiment. LaTeX2e, 24 pages, 9 eps figures, uses revtex4 and graphicx, published in PRD |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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