Study of B s 0 $$ {\mathrm{B}}_{\mathrm{s}}^0 $$ → J/ψπ+π−K+K− decays
Abstract The decays B s 0 $$ {\mathrm{B}}_{\mathr...
| Main Authors: | , , , , , , , , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Springer Berlin Heidelberg
2021
|
| Online Access: | https://hdl.handle.net/1721.1/131949 |
| Summary: | Abstract
The decays
B
s
0
$$ {\mathrm{B}}_{\mathrm{s}}^0 $$
→ J/ψπ+π−K+K− are studied using a data set corresponding to an integrated luminosity of 9 fb−1, collected with the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The decays
B
s
0
$$ {\mathrm{B}}_{\mathrm{s}}^0 $$
→
J
/
ψK
∗
0
K
¯
∗
0
$$ \mathrm{J}/{\uppsi \mathrm{K}}^{\ast 0}{\overline{\mathrm{K}}}^{\ast 0} $$
and
B
s
0
$$ {\mathrm{B}}_{\mathrm{s}}^0 $$
→ χc1(3872)K+K−, where the K+K−pair does not originate from a ϕ meson, are observed for the first time. Precise measurements of the ratios of branching fractions between intermediate χc1(3872)ϕ,
J
/
ψK
∗
0
K
¯
∗
0
$$ \mathrm{J}/{\uppsi \mathrm{K}}^{\ast 0}{\overline{\mathrm{K}}}^{\ast 0} $$
, ψ(2S)ϕ and χc1(3872)K+K− states are reported. A structure, denoted as X(4740), is observed in the J/ψϕ mass spectrum and, assuming a Breit-Wigner parameterisation, its mass and width are determined to be
m
X
4740
=
4741
±
6
±
6
MeV
/
c
2
,
Γ
X
4740
=
53
±
15
±
11
MeV
,
$$ {\displaystyle \begin{array}{c}{m}_{\mathrm{X}(4740)}=4741\pm 6\pm 6\kern0.5em \mathrm{MeV}/{c}^2,\\ {}{\Gamma}_{\mathrm{X}(4740)}=53\pm 15\pm 11\kern0.5em \mathrm{MeV},\end{array}} $$
where the first uncertainty is statistical and the second is systematic. In addition, the most precise single measurement of the mass of the
B
s
0
$$ {\mathrm{B}}_{\mathrm{s}}^0 $$
meson is performed and gives a value of
m
B
s
0
=
5366.98
±
0.07
±
0.13
MeV
/
c
2
.
$$ {m}_{{\mathrm{B}}_{\mathrm{s}}^0}=5366.98\pm 0.07\pm 0.13\kern0.5em \mathrm{MeV}/{c}^2. $$ |
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