Abstract
A search for the rare decay is performed using collision data collected with the LHCb dete-ctor at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. No significant signal of the decay is observed and an upper limit of at 90% confidence level is set on the branching fraction.
Highlights
The B0 →J/ψK + K − decay was first observed by the LHCb experiment with a branching fraction of (2.51±0.35 ± 0.19) × 10−6 [1]
The K + K − pair can come either directly from the B0 decay via an s spair created in the vacuum, or from the decay of intermediate states that contain both ddand s scomponents, such as the a0 (980) resonance
Under the assumption that the dominant contribution is via a small ddcomponent in the φ wave-function, arising from ω − φ mixing (Fig. 1(a)), the branching fraction of the B0 →J/ψφ decay is predicted to be of the order of 10−7 [5]
Summary
Received 16 November 2020; Accepted 12 December 2020; Published online 12 January 2021.
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