Chiral corrections to hyperon vector form-factors

Anderson, Jeffrey; Luty, Markus A.

doi:10.1103/PhysRevD.47.4975

Chiral corrections to hyperon vector form-factors

Jeffrey Anderson
(
- LBL, Berkeley
)
,
Markus A. Luty
(
- LBL, Berkeley
)

Jan, 1993

11 pages

Published in:

Phys.Rev.D 47 (1993) 4975-4980

e-Print:

hep-ph/9301219 [hep-ph]

DOI:

10.1103/PhysRevD.47.4975

Report number:

LBL-33435

View in:

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Abstract:

We show that the leading

SU(3)

-breaking corrections to the

\Delta S = 1

f_1

vector form factors of hyperons are

O(m_s)

and

O(m_s~{3/2})

, and are expected to be

\sim 20

--

30\%

by dimensional analysis. This is consistent with the Ademollo--Gatto theorem, in a sense that we explain. We compute the

O(m_s)

corrections and a subset of the

O(m_s~{3/2})

corrections using an effective lagrangian in which the baryons are treated as heavy particles. All of these corrections are surprisingly small,

\sim 5\%

; combining them, we obtain

\sim 5

--

10\%

corrections. The pattern of corrections is very different than that predicted by quark models.

hyperon: decay
decay: hyperon
form factor: vector
vector: form factor
quark
perturbation theory: chiral
symmetry breaking: SU(3) x SU(3)
effective Lagrangian
Feynman graph: higher-order
numerical calculations

References(14)

Figures(0)

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