Nucleon decay matrix elements from lattice QCD
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ID | 14617 |
本文ファイル | |
著者 |
JLQCD, Collaboration
Aoki, S
Fukugita, M
Hashimoto, S
Ishizuka, N
Iwasaki, Y
Kanaya, K
Kaneda, T
Kaya, S
Kuramashi, Y
Onogi, T
Tominaga, S
Tsutsui, N
Ukawa, A
Yamada, N
Yoshié, T
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NDC |
物理学
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抄録(英) | We present a model-independent calculation of hadron matrix elements for all dimension-6 operators associated with baryon number violating processes using lattice QCD. The calculation is performed with the Wilson quark action in the quenched approximation at β=6/g2=6.0 on a 282×48×80 lattice. Our results cover all the matrix elements required to estimate the partial lifetimes of (proton,neutron)→(π,K,η)+(ν̅,e+,μ+) 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 the chiral Lagrangian.
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掲載誌名 |
Physical Review D
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巻 | 62巻
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開始ページ | 014506
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出版年月日 | 2000
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出版者 | The American Physical Society
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ISSN | 1550-7998
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言語 |
英語
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NII資源タイプ |
学術雑誌論文
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広大資料タイプ |
学術雑誌論文
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DCMIタイプ | text
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フォーマット | application/pdf
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著者版フラグ | publisher
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権利情報 | Copyright (c) 2000 The American Physical Society
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関連情報URL(IsVersionOf) | http://dx.doi.org/10.1103/PhysRevD.62.014506
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部局名 |
理学研究科
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