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Nonleptonic two-body weak decays of charmed baryons
Authors
Chia-Wei Liu
Publication date
15 August 2023
Publisher
View
on
arXiv
Abstract
We systematically analyze the two-body nonleptonic weak decays of charmed baryons, employing the pole approximation in tandem with the
S
U
(
3
)
F
SU(3)_F
S
U
(
3
)
F
β
symmetry. Leveraging the K\"orner-Patti-Woo theorem, we demonstrate a significant reduction in the number of free parameters. Within the general pole scenario, we successfully explain most of the experimental data of
B
c
A
β
B
n
P
{\bf B}_c^A \to {\bf B}_nP
B
c
A
β
β
B
n
β
P
, though some inconsistencies are detected and recommended for reexamination in future research. Assuming the dominance of low-lying intermediate baryons, we are able to make novel predictions for decay channels such as
Ξ©
c
0
β
B
n
P
\Omega_c^0 \to {\bf B}_n P
Ξ©
c
0
β
β
B
n
β
P
and
B
c
c
β
B
c
A
,
S
P
{\bf B}_{cc}\to {\bf B}_c^{A,S} P
B
cc
β
β
B
c
A
,
S
β
P
. Here,
B
n
{\bf B}_n
B
n
β
,
B
c
A
{\bf B}_{c}^A
B
c
A
β
,
B
c
S
{\bf B}_c^S
B
c
S
β
and
B
c
c
{\bf B}_{cc}
B
cc
β
are the low-lying octet, antitriplet charmed, sextet charmed and doubly charmed baryons, respectively, and
P
P
P
is the pseudoscalar meson. Our findings also reveal that the fitted effective Wilson coefficient
C
+
=
0.469
{\cal C}_+=0.469
C
+
β
=
0.469
is notably smaller than the na\"ive expectation, and the low-lying pole scenario fails to account for
B
(
Ξ
c
+
β
n
Ο
+
,
Ξ
0
K
+
)
{\cal B}(\Lambda_c^+ \to n \pi^+ , \Xi^0 K^+)
B
(
Ξ
c
+
β
β
n
Ο
+
,
Ξ
0
K
+
)
, despite consistencies with the soft meson limit. We further recommend the decay channel
Ξ
c
c
+
β
Ξ
c
0
Ο
+
β
Ξ
β
Ο
+
Ο
+
Ο
+
Ο
β
\Xi_{cc}^+ \to \Xi_c^0 \pi^+ \to \Xi^- \pi^+\pi^+\pi^+\pi^-
Ξ
cc
+
β
β
Ξ
c
0
β
Ο
+
β
Ξ
β
Ο
+
Ο
+
Ο
+
Ο
β
for exploring evidence of
Ξ
c
c
+
\Xi_{cc}^+
Ξ
cc
+
β
, estimating the branching fraction at
(
1.1
Β±
0.6
)
Γ
1
0
β
3
(1.1\pm 0.6)\times 10^{-3}
(
1.1
Β±
0.6
)
Γ
1
0
β
3
. The predictions for nonleptonic weak decay channels are compiled in the appendices, providing valuable references for future experimental validation.Comment: 37 pages, 3 figure
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oai:arXiv.org:2308.07754
Last time updated on 18/08/2023