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
Abstract The $$\Xi _b^0 \rightarrow \Xi _c^+ D_s^-$$ Ξ b 0...
Other Authors: | |
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Format: | Article |
Language: | English |
Published: |
Springer Science and Business Media LLC
2024
|
Subjects: | |
Online Access: | https://hdl.handle.net/1721.1/153649 |
Summary: | 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. |
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