Study of $$ {B}_c^{+}\to {\chi}_c{\pi}^{+} $$ decays
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13130_2024_Article_22883.pdf
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Author(s)
Aaij, R.
Abdelmotteleb, A. S. W.
Abellan Beteta, C.
Abudinén, F.
Ackernley, T.
Adefisoye, A. A.
Adeva, B.
Adinolfi, M.
Adlarson, P.
Agapopoulou, C.
Date Issued
February 22, 2024
Publisher
Springer Science and Business Media LLC
Citation
Journal of High Energy Physics. 2024 Feb 22;2024(2):173
Version
Final published version
Abstract
A study of
B
c
+
→
χ
c
π
+
$$ {B}_c^{+}\to {\chi}_c{\pi}^{+} $$
decays is reported using proton-proton collision data, collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. The decay
B
c
+
→
χ
c
2
π
+
$$ {B}_c^{+}\to {\chi}_{c2}{\pi}^{+} $$
is observed for the first time, with a significance exceeding seven standard deviations. The relative branching fraction with respect to the
B
c
+
→
J
/
ψ
π
+
$$ {B}_c^{+}\to J/\psi {\pi}^{+} $$
decay is measured to be
B
B
c
+
→
χ
c
2
π
+
B
B
c
+
→
J
/
ψ
π
+
=
0.37
±
0.06
±
0.02
±
0.01
,
$$ \frac{{\mathcal{B}}_{B_c^{+}\to {\chi}_{c2}{\pi}^{+}}}{{\mathcal{B}}_{B_c^{+}\to J/\psi {\pi}^{+}}}=0.37\pm 0.06\pm 0.02\pm 0.01, $$
where the first uncertainty is statistical, the second is systematic, and the third is due to the knowledge of the χc2 → J/ψγ branching fraction. No significant
B
c
+
→
χ
c
1
π
+
$$ {B}_c^{+}\to {\chi}_{c1}{\pi}^{+} $$
signal is observed and an upper limit for the relative branching fraction for the
B
c
+
→
χ
c
1
π
+
$$ {B}_c^{+}\to {\chi}_{c1}{\pi}^{+} $$
and
B
c
+
→
χ
c
2
π
+
$$ {B}_c^{+}\to {\chi}_{c2}{\pi}^{+} $$
decays of
B
B
c
+
→
χ
c
1
π
+
B
B
c
+
→
χ
c
2
π
+
=
<
0.49
$$ \frac{{\mathcal{B}}_{B_c^{+}\to {\chi}_{c1}{\pi}^{+}}}{{\mathcal{B}}_{B_c^{+}\to {\chi}_{c2}{\pi}^{+}}}=<0.49 $$
is set at the 90% confidence level.
Subjects
Nuclear and High Energy Physics
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/jhep02(2024)173
