Nucleon decay matrix elements from lattice QCD
Use this link to cite this item : https://ir.lib.hiroshima-u.ac.jp/00014617
ID | 14617 |
file | |
creator |
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 |
Physics
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abstract | 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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journal title |
Physical Review D
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volume | Volume 62
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start page | 014506
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date of issued | 2000
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publisher | The American Physical Society
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issn | 1550-7998
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language |
eng
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nii type |
Journal Article
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HU type |
Journal Articles
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DCMI type | text
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format | application/pdf
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text version | publisher
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rights | Copyright (c) 2000 The American Physical Society
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relation is version of URL | http://dx.doi.org/10.1103/PhysRevD.62.014506
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department |
Graduate School of Science
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