Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
1999-11-23
Phys.Rev. D62 (2000) 014506
Physics
High Energy Physics
High Energy Physics - Lattice
53 pages, 18 eps figures
Scientific paper
10.1103/PhysRevD.62.014506
We present a model-independent calculation of hadron matrix elements for all dimension-six operators associated with baryon number violating processes using lattice QCD. The calculation is performed with the Wilson quark action in the quenched approximation at $\beta=6/g^2=6.0$ on a $28^2\times 48\times 80$ lattice. Our results cover all the matrix elements required to estimate the partial lifetimes of (proton,neutron)$\to$($\pi,K,\eta$) +(${\bar \nu},e^+,\mu^+$) decay modes. We point out the necessity of disentangling two form factors that contribute to the matrix element; previous calculations did not make the separation, which led to an underestimate of the physical matrix elements. With a correct separation, we find that the matrix elements have values 3-5 times larger than the smallest estimates employed in phenomenological analyses of the nucleon decays, which could give strong constraints on several GUT models. We also find that the values of the matrix elements are comparable with the tree-level predictions of chiral lagrangian.
Aoki Sadao
Fukugita Masaaka
Hashimoto Shigehira
Ishikawa Kei-Ichi
Ishizuka Naruhito
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