SU(3) breaking effects in hyperon beta decay from lattice QCD

Shoichi Sasaki; Takeshi Yamazaki

SU(3) breaking effects in hyperon beta decay from lattice QCD

Research output: Contribution to journal › Conference article › peer-review

Abstract

We present results of an exploratory study of flavor SU(3) breaking effects in hyperon beta decays using domain wall fermions. From phenomenological point of view, the significance of this subject is twofold: (1) to extract the element V_us of the Cabibbo-Kabayashi-Maskawa mixing matrix from the ΔS = 1 decay process, and (2) to provide vital information to analysis of the strange quark fraction of the proton spin with the polarized deep inelastic scattering data. In this study, we explore the Ξ⁰ → Σ⁺ beta decay, which is highly sensitive to the SU(3) breaking since this decay corresponds to the direct analogue of neutron beta decay under an exchange between the down quark and the strange quark. We expose the SU(3) breaking effect on g_A/g_V = g₁(0)/f₁(0) up to the first order in breaking. The second-class form factors g₂ and f₃, of which non-zero values are the direct signals of the SU(3) breaking effect, are also measured. Finally, we estimate f₁(0) up to the second-order correction and then evaluate |V_us| combined with the KTeV experiment.

Original language	English
Journal	Proceedings of Science
Volume	32
Publication status	Published - 2006 Jan 1
Externally published	Yes
Event	24th International Symposium on Lattice Field Theory, LATTICE 2006 - Tucson, United States Duration: 2006 Jul 23 → 2006 Jul 28

ASJC Scopus subject areas

General

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@article{bfc7f31d42d24169a1328670a42d475d,

title = "SU(3) breaking effects in hyperon beta decay from lattice QCD",

abstract = "We present results of an exploratory study of flavor SU(3) breaking effects in hyperon beta decays using domain wall fermions. From phenomenological point of view, the significance of this subject is twofold: (1) to extract the element Vus of the Cabibbo-Kabayashi-Maskawa mixing matrix from the ΔS = 1 decay process, and (2) to provide vital information to analysis of the strange quark fraction of the proton spin with the polarized deep inelastic scattering data. In this study, we explore the Ξ0 → Σ+ beta decay, which is highly sensitive to the SU(3) breaking since this decay corresponds to the direct analogue of neutron beta decay under an exchange between the down quark and the strange quark. We expose the SU(3) breaking effect on gA/gV = g1(0)/f1(0) up to the first order in breaking. The second-class form factors g2 and f3, of which non-zero values are the direct signals of the SU(3) breaking effect, are also measured. Finally, we estimate f1(0) up to the second-order correction and then evaluate |Vus| combined with the KTeV experiment.",

author = "Shoichi Sasaki and Takeshi Yamazaki",

year = "2006",

month = jan,

day = "1",

language = "English",

volume = "32",

journal = "Proceedings of Science",

issn = "1824-8039",

publisher = "Sissa Medialab Srl",

note = "24th International Symposium on Lattice Field Theory, LATTICE 2006 ; Conference date: 23-07-2006 Through 28-07-2006",

}

TY - JOUR

T1 - SU(3) breaking effects in hyperon beta decay from lattice QCD

AU - Sasaki, Shoichi

AU - Yamazaki, Takeshi

PY - 2006/1/1

Y1 - 2006/1/1

N2 - We present results of an exploratory study of flavor SU(3) breaking effects in hyperon beta decays using domain wall fermions. From phenomenological point of view, the significance of this subject is twofold: (1) to extract the element Vus of the Cabibbo-Kabayashi-Maskawa mixing matrix from the ΔS = 1 decay process, and (2) to provide vital information to analysis of the strange quark fraction of the proton spin with the polarized deep inelastic scattering data. In this study, we explore the Ξ0 → Σ+ beta decay, which is highly sensitive to the SU(3) breaking since this decay corresponds to the direct analogue of neutron beta decay under an exchange between the down quark and the strange quark. We expose the SU(3) breaking effect on gA/gV = g1(0)/f1(0) up to the first order in breaking. The second-class form factors g2 and f3, of which non-zero values are the direct signals of the SU(3) breaking effect, are also measured. Finally, we estimate f1(0) up to the second-order correction and then evaluate |Vus| combined with the KTeV experiment.

AB - We present results of an exploratory study of flavor SU(3) breaking effects in hyperon beta decays using domain wall fermions. From phenomenological point of view, the significance of this subject is twofold: (1) to extract the element Vus of the Cabibbo-Kabayashi-Maskawa mixing matrix from the ΔS = 1 decay process, and (2) to provide vital information to analysis of the strange quark fraction of the proton spin with the polarized deep inelastic scattering data. In this study, we explore the Ξ0 → Σ+ beta decay, which is highly sensitive to the SU(3) breaking since this decay corresponds to the direct analogue of neutron beta decay under an exchange between the down quark and the strange quark. We expose the SU(3) breaking effect on gA/gV = g1(0)/f1(0) up to the first order in breaking. The second-class form factors g2 and f3, of which non-zero values are the direct signals of the SU(3) breaking effect, are also measured. Finally, we estimate f1(0) up to the second-order correction and then evaluate |Vus| combined with the KTeV experiment.

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M3 - Conference article

AN - SCOPUS:85055676022

VL - 32

JO - Proceedings of Science

JF - Proceedings of Science

SN - 1824-8039

T2 - 24th International Symposium on Lattice Field Theory, LATTICE 2006

Y2 - 23 July 2006 through 28 July 2006

ER -