Proton lifetime bounds from chirally symmetric lattice QCD

被引：51

作者：

Aoki, Y. ^{[1
]}

Boyle, P. ^{[2
]}

Cooney, P. ^{[2
]}

Del Debbio, L. ^{[2
]}

Kenway, R. ^{[2
]}

Maynard, C. M. ^{[3
]}

Soni, A. ^{[4
]}

Tweedie, R. ^{[2
]}

机构：

[1] Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA

[2] Univ Edinburgh, Sch Phys, SUPA, Edinburgh EH9 3JZ, Midlothian, Scotland

[3] Univ Edinburgh, Sch Phys, EPCC, Edinburgh EH9 3JZ, Midlothian, Scotland

[4] Brookhaven Natl Lab, High Energy Theory Grp, Upton, NY 11973 USA

来源：

PHYSICAL REVIEW D | 2008年 / 78卷 / 05期

基金：

英国科学技术设施理事会;

关键词：

D O I：

10.1103/PhysRevD.78.054505

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present results for the matrix elements relevant for proton decay in grand unified theories (GUTs). The calculation is performed at a fixed lattice spacing a(-1) = 1.73(3) GeV using 2 + 1 flavors of domain-wall fermions on lattices of size 16(3) x 32 and 24(3) x 64 with a fifth dimension of length 16. We use the indirect method which relies on an effective field theory description of proton decay, where we need to estimate the low-energy constants, alpha = -0.0112(25) GeV3 and beta = 0.0120(26) GeV3. We relate these low-energy constants to the proton decay matrix elements using leading order chiral perturbation theory. These can then be combined with experimental bounds on the proton lifetime to bound parameters of individual GUTs.

引用

页数：14

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