Observation of the B+ c → J/ψπ+π 0 decay
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13130_2024_Article_23275.pdf
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Author(s)
Aaij, R.
Abdelmotteleb, A. S. W.
Abellan Beteta, C.
Abudinén, F.
Ackernley, T.
Adams, J. A.
Adefisoye, A. A.
Adeva, B.
Adinolfi, M.
Adlarson, P.
Date Issued
April 30, 2024
Publisher
Springer Science and Business Media LLC
Citation
The LHCb collaboration., Aaij, R., Abdelmotteleb, A.S.W. et al. Observation of the 𝐵+𝑐→𝐽/𝜓𝜋+𝜋0 decay. J. High Energ. Phys. 2024, 151 (2024).
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/jhep04(2024)151
