Observation of the B0 s → χc1(3872)π +π – decay
Abstract The first observation of the B s 0 $$ {B...
| Main Authors: | , , , , , , , , , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Springer Berlin Heidelberg
2023
|
| Online Access: | https://hdl.handle.net/1721.1/152388 |
| Summary: | Abstract
The first observation of the
B
s
0
$$ {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. |
|---|