Observation of the B0 s → χc1(3872)π +π – decay
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13130_2023_Article_21296.pdf
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Author(s)
Aaij, R.
Abdelmotteleb, A. S. W.
Abellan Beteta, C.
Abudinén, F.
Ackernley, T.
Adeva, B.
Adinolfi, M.
Adlarson, P.
Afsharnia, H.
Agapopoulou, C.
Date Issued
July 11, 2023
Publisher
Springer Berlin Heidelberg
Citation
Journal of High Energy Physics. 2023 Jul 11;2023(7):84
Version
Final published version
Abstract
Abstract
The first observation of the
B
s
0
$$ {B}_s^0 $$
→ (χc1(3872) → J/ψπ+π−)π+π− decay is reported using proton-proton collision data, corresponding to integrated luminosities of 1, 2 and 6 fb−1, collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, respectively. The ratio of branching fractions relative to the
B
s
0
$$ {B}_s^0 $$
→ (ψ(2S) → J/ψπ+π−)π+π− decay is measured to be
B
B
s
0
→
χ
c
1
3872
π
+
π
−
×
B
χ
c
1
3872
→
J
/
ψ
π
+
π
−
B
B
s
0
→
ψ
2
S
π
+
π
−
×
B
ψ
2
S
→
J
/
ψ
π
+
π
−
=
6.8
±
1.1
±
0.2
×
10
−
2
,
$$ \frac{\mathcal{B}\left({B}_s^0\to {\chi}_{c1}(3872){\pi}^{+}{\pi}^{-}\right)\times \mathcal{B}\left({\chi}_{c1}(3872)\to J/\psi {\pi}^{+}{\pi}^{-}\right)}{\mathcal{B}\left({B}_s^0\to \psi (2S){\pi}^{+}{\pi}^{-}\right)\times \mathcal{B}\left(\psi (2S)\to J/\psi {\pi}^{+}{\pi}^{-}\right)}=\left(6.8\pm 1.1\pm 0.2\right)\times {10}^{-2}, $$
where the first uncertainty is statistical and the second systematic. The mass spectrum of the π+π− system recoiling against the χc1(3872) meson exhibits a large contribution from
B
s
0
$$ {B}_s^0 $$
→ χc1(3872) (f0(980) → π+π−) decays.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/JHEP07(2023)084
