Observation of the B+ c → J/ψπ+π 0 decay
The first observation of the B c + → J / ψ...
| Main Authors: | , , , , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Springer Science and Business Media LLC
2024
|
| Online Access: | https://hdl.handle.net/1721.1/154930 |
| Summary: | The first observation of the
B
c
+
→
J
/
ψ
π
+
π
0
$$ {B}_c^{+}\to J/\psi {\pi}^{+}{\pi}^0 $$
decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of 9 fb−1, collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV. The ratio of its branching fraction relative to the
B
c
+
→
J
/
ψ
π
+
$$ {B}_c^{+}\to J/\psi {\pi}^{+} $$
channel is measured to be
B
B
c
+
→
J
/
ψ
π
+
π
0
B
B
c
+
→
J
/
ψ
π
+
=
2.80
±
0.15
±
0.11
±
0.16
,
$$ \frac{{\mathcal{B}}_{B_c^{+}\to J/\psi {\pi}^{+}{\pi}^0}}{{\mathcal{B}}_{B_c^{+}\to J/\psi {\pi}^{+}}}=2.80\pm 0.15\pm 0.11\pm 0.16, $$
where the first uncertainty is statistical, the second systematic and the third related to imprecise knowledge of the branching fractions for B+ → J/ψK*+ and
B
c
+
→
J
/
ψ
π
+
$$ {B}_c^{+}\to J/\psi {\pi}^{+} $$
decays, which are used to determine the π0 detection efficiency. The π+π0 mass spectrum is found to be consistent with the dominance of an intermediate ρ+ contribution in accordance with a model based on QCD factorisation. |
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