Observation of $${{\varXi } ^0_{b}} \rightarrow {{\varXi } ^+_{c}} {{D} ^-_{s}} $$ Ξ b 0 → Ξ c + D s - and $${{\varXi } ^-_{b}} \rightarrow {{\varXi } ^0_{c}} {{D} ^-_{s}} $$ Ξ b - → Ξ c 0 D s - decays
Name
10052_2024_Article_12443.pdf
Size
2.55 MB
Format
Adobe PDF
Checksum (MD5)
67c0901f97e9bfaedb49ee2b9c6700c5
Date Issued
March 7, 2024
Publisher
Springer Science and Business Media LLC
Citation
The European Physical Journal C. 2024 Mar 07;84(3):237
Version
Final published version
Abstract
Abstract
The
$$\Xi _b^0 \rightarrow \Xi _c^+ D_s^-$$
Ξ
b
0
→
Ξ
c
+
D
s
-
and
$$\Xi _b^- \rightarrow \Xi _c^0 D_s^-$$
Ξ
b
-
→
Ξ
c
0
D
s
-
decays are observed for the first time using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of
$$\sqrt{s}=13\,\,\textrm{TeV}$$
s
=
13
TeV
, corresponding to an integrated luminosity of
$$5.1\,\,\textrm{fb}^{-1}$$
5.1
fb
-
1
. The branching fractions times the production cross-sections of
$$\Xi _b$$
Ξ
b
baryons relative to that of
$$\Lambda _b^0$$
Λ
b
0
baryon are measured to be
$$\begin{aligned} \mathcal {R}\left( \frac{\Xi _b^0}{\Lambda _b^0}\right)&\equiv \frac{\sigma \left( \Xi _b^0\right) }{\sigma \left( \Lambda _b^0\right) } \times \frac{\mathcal {B}\left( \Xi _b^0 \rightarrow \Xi _c^+ D_s^-\right) }{\mathcal {B}\left( \Lambda _b^0 \rightarrow \Lambda _c^0 D_s^-\right) }\\&=(15.8\pm 1.1\pm 0.6\pm 7.7)\%,\\ \mathcal {R}\left( \frac{\Xi _b^-}{\Lambda _b^0}\right)&\equiv \frac{\sigma \left( \Xi _b^-\right) }{\sigma \left( \Lambda _b^0\right) } \times \frac{\mathcal {B}\left( \Xi _b^- \rightarrow \Xi _c^0 D_s^-\right) }{\mathcal {B}\left( \Lambda _b^0 \rightarrow \Lambda _c^0 D_s^-\right) } \\&=(16.9\pm 1.3\pm 0.9\pm 4.3)\%, \end{aligned}$$
R
Ξ
b
0
Λ
b
0
≡
σ
Ξ
b
0
σ
Λ
b
0
×
B
Ξ
b
0
→
Ξ
c
+
D
s
-
B
Λ
b
0
→
Λ
c
0
D
s
-
=
(
15.8
±
1.1
±
0.6
±
7.7
)
%
,
R
Ξ
b
-
Λ
b
0
≡
σ
Ξ
b
-
σ
Λ
b
0
×
B
Ξ
b
-
→
Ξ
c
0
D
s
-
B
Λ
b
0
→
Λ
c
0
D
s
-
=
(
16.9
±
1.3
±
0.9
±
4.3
)
%
,
where the first uncertainties are statistical, the second systematic, and the third due to the uncertainties on the decay branching fractions of relevant charmed baryons. The masses of
$$\Xi _b^0$$
Ξ
b
0
and
$$\Xi _b^-$$
Ξ
b
-
baryons are measured to be
$$m_{\Xi _b^0}=5791.12\pm 0.60\pm 0.45\pm 0.24\,\,\textrm{MeV}/c^2$$
m
Ξ
b
0
=
5791.12
±
0.60
±
0.45
±
0.24
MeV
/
c
2
and
$$m_{\Xi _b^-}=5797.02\pm 0.63\pm 0.49\pm 0.29\,\,\textrm{MeV}/c^2$$
m
Ξ
b
-
=
5797.02
±
0.63
±
0.49
±
0.29
MeV
/
c
2
, where the uncertainties are statistical, systematic, and those due to charmed-hadron masses, respectively.
Subjects
Physics and Astronomy (miscellaneous)
Engineering (miscellaneous)
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1140/epjc/s10052-024-12443-z
