Measurement of the branching fraction and $$C\!P$$ C P asymmetry in $${{{B} ^+}} \!\rightarrow {{J /\psi }} {{\rho } ^+} $$ B + → J / ψ ρ + decays
Author(s)
Aaij, R.; Beteta, C. A; Adeva, B.; Adinolfi, M.; Aidala, C. A; Ajaltouni, Z.; Akar, S.; Albicocco, P.; Albrecht, J.; Alessio, F.; Alexander, M.; Albero, A. A; Alkhazov, G.; Alvarez Cartelle, P.; Alves, A. A; Amato, S.; Amerio, S.; Amhis, Y.; An, L.; Anderlini, L.; ... Show more Show less
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Abstract
The branching fraction and direct
$$C\!P$$
C
P
asymmetry of the decay
$${{{B} ^+}} \!\rightarrow {{J /\psi }} {{\rho } ^+} $$
B
+
→
J
/
ψ
ρ
+
are measured using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV, corresponding to a total integrated luminosity of 3
$$\,\text{ fb }^{-1}$$
fb
-
1
. The following results are obtained:
$$\begin{aligned} \mathcal {B}({{B} ^+} \!\rightarrow {{J /\psi }} {{\rho } ^+} )&= (3.81^{+0.25}_{-0.24} \pm 0.35) \times 10^{-5},\\ \mathcal {A}^{{C\!P}} ({{B} ^+} \!\rightarrow {{J /\psi }} {{\rho } ^+} )&= -0.045^{+0.056}_{-0.057} \pm 0.008, \end{aligned}$$
B
(
B
+
→
J
/
ψ
ρ
+
)
=
(
3
.
81
-
0.24
+
0.25
±
0.35
)
×
10
-
5
,
A
C
P
(
B
+
→
J
/
ψ
ρ
+
)
=
-
0
.
045
-
0.057
+
0.056
±
0.008
,
where the first uncertainties are statistical and the second systematic. Both measurements are the most precise to date.
Date issued
2019-06-24Department
Massachusetts Institute of Technology. Department of PhysicsPublisher
Springer Berlin Heidelberg
Citation
The European Physical Journal C. 2019 Jun 24;79(6):537
Version: Final published version