Observation of B $$^0$$ 0 $$\rightarrow $$ → $$\uppsi $$ ψ (2S)K $$^0_\mathrm {S}\uppi ^+\uppi ^-$$ S 0 π + π - and B $$^0_\mathrm {s}$$ s 0 $$\rightarrow $$ → $$\uppsi $$ ψ (2S)K $$^0_\mathrm {S}$$ S 0 decays
Abstract Using a data sample of $$\sqrt{s}=13\,\text {TeV}$$ s =...
| Main Authors: | , , , , , , , , , , , , , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Springer Berlin Heidelberg
2022
|
| Online Access: | https://hdl.handle.net/1721.1/142879 |
| Summary: | Abstract
Using a data sample of
$$\sqrt{s}=13\,\text {TeV}$$
s
=
13
TeV
proton-proton collisions collected by the CMS experiment at the LHC in 2017 and 2018 with an integrated luminosity of
$$103\text {~fb}^{-1}$$
103
fb
-
1
, the
$$\text {B}^{0}_{\mathrm{s}} \rightarrow \uppsi (\text {2S})\text {K}_\mathrm{S}^{0}$$
B
s
0
→
ψ
(
2S
)
K
S
0
and
$$\text {B}^{0} \rightarrow \uppsi (\text {2S})\text {K}_\mathrm{S}^{0} \uppi ^+\uppi ^-$$
B
0
→
ψ
(
2S
)
K
S
0
π
+
π
-
decays are observed with significances exceeding 5 standard deviations. The resulting branching fraction ratios, measured for the first time, correspond to
$${\mathcal {B}}(\text {B}^{0}_{\mathrm{s}} \rightarrow \uppsi (\text {2S})K_\mathrm{S}^{0})/{\mathcal {B}}(\text {B}^{0}\rightarrow \uppsi (\text {2S})K_\mathrm{S}^{0}) = (3.33 \pm 0.69 (\text {stat})\, \pm 0.11\,(\text {syst}) \pm 0.34\,(f_{\mathrm{s}}/f_{\mathrm{d}})) \times 10^{-2}$$
B
(
B
s
0
→
ψ
(
2S
)
K
S
0
)
/
B
(
B
0
→
ψ
(
2S
)
K
S
0
)
=
(
3.33
±
0.69
(
stat
)
±
0.11
(
syst
)
±
0.34
(
f
s
/
f
d
)
)
×
10
-
2
and
$${\mathcal {B}}(\text {B}^{0} \rightarrow \uppsi (\text {2S})\text {K}_\mathrm{S}^{0} \uppi ^{+} \uppi ^{-})/ {\mathcal {B}}(\text {B}^{0} \rightarrow \uppsi (\text {2S})\text {K}^{0}_{\mathrm{S}}) = 0.480 \pm 0.013\,(\text {stat}) \pm 0.032\,(\text {syst})$$
B
(
B
0
→
ψ
(
2S
)
K
S
0
π
+
π
-
)
/
B
(
B
0
→
ψ
(
2S
)
K
S
0
)
=
0.480
±
0.013
(
stat
)
±
0.032
(
syst
)
, where the last uncertainty in the first ratio is related to the uncertainty in the ratio of production cross sections of
$$\hbox {B}^{0}_{\mathrm{s}}$$
B
s
0
and
$$\hbox {B}^{0}$$
B
0
mesons,
$$f_{\mathrm{s}}/f_{\mathrm{d}}$$
f
s
/
f
d
. |
|---|