Λc+非轻子两体弱衰变研究与预测
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"Λc+的非轻子两体弱衰变研究"
在粒子物理学中，Λc+（2286）是一种被称为粲Λ超子的重子，它由一个粲夸克、一个上夸克和一个下夸克组成。这篇发表在《Physics Letters B》上的研究专注于Λc+的非轻子两体弱衰变过程，即Λc+衰变成一个重子Bn和一个介子M。这个领域的研究对于理解基本粒子的性质和相互作用至关重要，特别是强相互作用和弱相互作用。
该研究基于SU（3）味道对称性理论，这是一种在夸克模型中描述重子之间关系的数学框架。SU（3）对称性允许科学家预测不同粒子衰变的相对概率，从而分析实验数据。BESIII（北京正负电子对撞机III）合作组重新检查了这些衰变事件，提供了更高的测量精度。
文章指出，Λc+→pπ0的衰变概率（或称为分支比）为B(Λc+→pπ0) = (5.6±1.5)×10-4，这高于BESIII实验当前的90%置信水平下限3×10-4。此外，研究还预测了其他几个衰变通道的分支比，例如Λc+→Σ+ K0的分支比为B(Λc+→Σ+ K0) = (8.0±1.6)×10-4，Λc+→Σ+ η'的分支比为B(Λc+→Σ+ η') = (1.0+1.6 - 0.8)×10-2，以及Λc+→pη'的分支比为B(Λc+→pη') = (12.2+14.3 - 8.7)×10-4。这些结果为进一步的实验观测提供了理论依据。
非轻子两体弱衰变是研究粒子性质的重要途径，因为它涉及到弱力的传递，这是四种基本相互作用之一。通过精确测量这些衰变过程，物理学家可以测试标准模型的预言，寻找可能的新物理现象，比如超出标准模型的新粒子或新相互作用。这些衰变模式的详细研究有助于我们更深入地理解夸克的结构和它们如何通过弱相互作用转化成其他粒子。
这项工作为Λc+的非轻子两体弱衰变提供了新的理论预测，这些预测可以与未来的实验结果进行比较，以检验理论的准确性和可能的物理新发现。同时，这也是粒子物理学领域中开放获取研究的一个例子，意味着研究成果可以被全球的研究者免费访问和使用，促进了科学知识的传播和合作。
Physics Letters B 776 (2018) 265–269
Contents lists available at ScienceDirect
Physics Letters B
www.elsevier.com/locate/physletb
Non-leptonic two-body weak decays of
c
(2286)
C.Q. Geng
a,b,∗
, Y.K. Hsiao
a,b
, Yu-Heng Lin
b
, Liang-Liang Liu
a
a
School of Physics and Information Engineering, Shanxi Normal University, Linfen 041004, China
b
Department of Physics, National Tsing Hua University, Hsinchu, 300, Taiwan
a r t i c l e i n f o a b s t r a c t
Article history:
Received
18 October 2017
Received
in revised form 25 November 2017
Accepted
26 November 2017
Available
online xxxx
Editor:
J. Hisano
We study the non-leptonic two-body weak decays of
+
c
(2286) → B
n
M with B
n
(M) representing as
the baryon (meson) states. Based on the SU(3) flavor symmetry, we can describe most of the data
reexamined by the BESIII Collaboration with higher precisions. However, our result of B(
+
c
→ pπ
0
) =
(
5.6 ± 1.5) × 10
−4
is larger than the current experimental limit of 3 × 10
−4
(90% C.L.) by BESIII. In
addition, we find that B(
+
c
→
+
K
0
) = (8.0 ± 1.6) × 10
−4
, B(
+
c
→
+
η
) = (1.0
+1.6
−0.8
) × 10
−2
, and
B(
+
c
→ pη
) = (12.2
+14.3
− 8.7
) ×10
−4
, which are accessible to the BESIII experiments.
© 2017 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP
3
.
1. Introduction
Recently, the BESIII Collaboration has reanalyzed the two-body
weak decays of
+
c
(2286) with the final states to be the combina-
tions
of baryon (B
n
) and pseudoscalar meson (M) particles, where
+
c
≡
+
c
(2286) along with
+,0
c
(2470) belongs to the lowest-
lying
anti-triplet charmed baryon (B
c
) state. In particular, the de-
cay
branching ratios of
+
c
→ p
¯
K
0
, π
+
,
+
π
0
and
0
π
+
have
been measured at the level of 10
−2
with high precisions [1]. In
addition, the Cabibbo-suppressed
+
c
→ pη decay has been ob-
served
for the first time [2]. According to the measurements of the
two-body
+
c
→ B
n
M decays since 2016 [1], there have been 4
measured branching fractions listed in PDG [3], given as
B(
+
c
→ p
¯
K
0
) =(3.16 ±0.16)% ,
B(
+
c
→π
+
) =(1.30 ±0.07)% ,
B(
+
c
→
+
π
0
) =(1.24 ±0.10)% ,
B(
+
c
→
0
π
+
) =(1.29 ±0.07)% , (1)
together with the new data [2], given by
B(
+
c
→ pη) =(1.24 ±0.28 ±0.10) ×10
−3
,
B(
+
c
→ pπ
0
)<3 ×10
−4
(90% C.L.). (2)
Note that the limit of B(
+
c
→ pπ
0
) in Eq. (2) comes from the
original data of B(
+
c
→ pπ
0
) = (7.95 ± 13.61) × 10
−5
[4] by BE-
*
Corresponding author.
E-mail
address: geng@phys.nthu.edu.tw (C.Q. Geng).
SIII, while the
+
c
→
+
K
0
, pη
and
+
η
decays, along with the
neutron modes, have not been seen yet. It is interesting to see if
these current data can be understood.
Theoretically,
the factorization approach is demonstrated to
well explain the B and b-baryon decays [5–7], such that it is
also applied to the two-body
+
c
→ B
n
M decays [8], of which
the amplitudes are derived as the combination of the two com-
putable
matrix elements for the
+
c
→ B
n
transition and the me-
son
(M) production. However, the factorization approach does not
work for most of the two-body
+
c
→ B
n
M ones. For example,
the decays of
+
c
→
+
π
0
and
0
K
+
are forbidden in the fac-
torization
approach [9], but their branching ratios turn out to
be measured. As a result, several theoretical attempts to improve
the factorization by taking into account the nonfactorizable effects
have been made [10–14]. In contrast with the QCD-based mod-
els,
the SU(3) symmetry approach is independent of the detailed
dynamics, which has been widely used in the B meson [15–17],
b-baryon [18,19] and
+
c
(
c
) [9,20–23] decays. With this ad-
vantage,
the two-body
+
c
→ B
n
M decays can be related by the
SU(3) parameters, which receive possible non-perturbative and
non-factorizable contributions [9,20–24], despite of the unknown
sources. The minimum χ
2
fit with the p-value estimation [3] can
statistically test if the SU(3) flavor symmetry agrees with the
data. Being determined from the fitting also, the SU(3) param-
eters
are taken to predict the not-yet-measured modes for the
future experimental tests. However, the global fit was once un-
achievable
without the sufficient data and the use of the symmetry
for
+
c
→ B
n
M. Clearly, the reexamination with the global fit to
match the currently more accurate data is needed. Note that, to
study the
+
c
→ B
n
η
()
decays, the singlet state of η
1
should be
included [16,17]. In this report, we will extract the SU(3) param-
https://doi.org/10.1016/j.physletb.2017.11.062
0370-2693/
© 2017 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by
SCOAP
3
.
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