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Search for
B
c
+
→
π
+
μ
+
μ
−
{{B} _{c} ^+} \!\rightarrow {{\pi } ^+} {\mu ^+\mu ^-}
B
c
+
→
π
+
μ
+
μ
−
decays and measurement of the branching fraction ratio
B
(
B
c
+
→
ψ
(
2
S
)
π
+
)
/
B
(
B
c
+
→
J
/
ψ
π
+
)
{\mathcal {B}} ({{B} _{c} ^+} \!\rightarrow {\psi {(2S)}} {{\pi } ^+} )/{\mathcal {B}} ({{B} _{c} ^+} \!\rightarrow {{J \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }} {{\pi } ^+} )
B
(
B
c
+
→
ψ
(
2
S
)
π
+
)
/
B
(
B
c
+
→
J
/
ψ
π
+
)
Authors
R Aaij
ASW Abdelmotteleb
+1096 more
F Goncalves Abrantes
F Abudinén
T Ackernley
B Adeva
M Adinolfi
P Adlarson
C Agapopoulou
CA Aidala
Z Ajaltouni
S Akar
K Akiba
A Alfonso Albero
P Albicocco
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M Alexander
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Publication date
7 May 2024
Publisher
The European Physical Journal C
Abstract
AbstractThe first search for nonresonant
B
c
+
→
π
+
μ
+
μ
−
{{B} _{c} ^+} \!\rightarrow {{\pi } ^+} {\mu ^+\mu ^-}
B
c
+
→
π
+
μ
+
μ
−
B c + → π + μ + μ - decays is reported. The analysis uses proton–proton collision data collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9
fb
−
1
\,\text {fb} ^{-1}
fb
−
1
fb - 1 . No evidence for an excess of signal events over background is observed and an upper limit is set on the branching fraction ratio
{\mathcal {B}} ({{B} _{c} ^+} \!\rightarrow {{\pi } ^+} {\mu ^+\mu ^-} )/{\mathcal {B}} ({{B} _{c} ^+} \!\rightarrow {{J \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }} {{\pi } ^+} ) < 2.1\times 10^{-4}
B ( B c + → π + μ + μ - ) / B ( B c + → J / ψ π + ) < 2.1 × 10 - 4 at
90
%
90\%
90%
90 % confidence level. Additionally, an updated measurement of the ratio of the
B
c
+
→
ψ
(
2
S
)
π
+
{{B} _{c} ^+} \!\rightarrow {\psi {(2S)}} {{\pi } ^+}
B
c
+
→
ψ
(
2
S
)
π
+
B c + → ψ ( 2 S ) π + and
B
c
+
→
J
/
ψ
π
+
{{B} _{c} ^+} \!\rightarrow {{J \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }} {{\pi } ^+}
B
c
+
→
J
/
ψ
π
+
B c + → J / ψ π + branching fractions is reported. The ratio
B
(
B
c
+
→
ψ
(
2
S
)
π
+
)
/
B
(
B
c
+
→
J
/
ψ
π
+
)
{\mathcal {B}} ({{B} _{c} ^+} \!\rightarrow {\psi {(2S)}} {{\pi } ^+} )/{\mathcal {B}} ({{B} _{c} ^+} \!\rightarrow {{J \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }} {{\pi } ^+} )
B
(
B
c
+
→
ψ
(
2
S
)
π
+
)
/
B
(
B
c
+
→
J
/
ψ
π
+
)
B ( B c + → ψ ( 2 S ) π + ) / B ( B c + → J / ψ π + ) is measured to be
0.254
±
0.018
±
0.003
±
0.005
0.254\pm 0.018 \pm 0.003 \pm 0.005
0.254
±
0.018
±
0.003
±
0.005
0.254 ± 0.018 ± 0.003 ± 0.005 , where the first uncertainty is statistical, the second systematic, and the third is due to the uncertainties on the branching fractions of the leptonic
J
/
ψ
{J \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }
J
/
ψ
J / ψ and
ψ
(
2
S
)
\psi {(2S)}
ψ
(
2
S
)
ψ ( 2 S ) decays. This measurement is the most precise to date and is consistent with previous LHCb results.</jats:p
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Last time updated on 13/05/2024