Measurement of the $B_s^0\to \varphi \varphi$ branching fraction and search for the decay $B^0\to \varphi \varphi$

Abstract

Using a dataset corresponding to an integrated luminosity of 3.0 fb${}^{-1}$ collected in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV, the $B_s^0\to \varphi \varphi$ branching fraction is measured to be \[ \mathcal{B}(B_s^0 \to ϕϕ) = ( 1.84 \pm 0.05 (\text{stat}) \pm 0.07 (\text{syst}) \pm 0.11 (f_s/f_d) \pm 0.12 (\text{norm}) ) \times 10^{-5}, \] where $f_s/f_d$ represents the ratio of the $B_s^0$ to $B^0$ production cross-sections, and the $B^0\to \varphi K^{\ast }(892{)}^0$ decay mode is used for normalization. This is the most precise measurement of this branching fraction to date, representing a factor five reduction in the statistical uncertainty compared with the previous best measurement. A search for the decay $B^0\to \varphi \varphi$ is also made. No signal is observed, and an upper limit on the branching fraction is set as \[ \mathcal{B}(B^0 \to ϕϕ) < 2.8 \times 10^{-8} \] at 90% confidence level. This is a factor of seven improvement compared to the previous best limit.

References in corpus (11)

• PYTHIA 6.4 Physics and Manual
• Big-Bang Nucleosynthesis
• LHCb Detector Performance
• Performance of the LHCb Vertex Locator
• Branching fractions, polarisation and asymmetries of B -> VV decays
• Measurement of the track reconstruction efficiency at LHCb
• Branching Ratio Measurements of $B_s$ Decays
• Improved Estimates of The $B_{(s)}\to VV$ Decays in Perturbative QCD Approach
• Sensitivity of searches for new signals and its optimization
• Measurement of polarization amplitudes and CP asymmetries in $B^0\to \varphi K^{\ast }(892{)}^0$
• Measurement of the polarization amplitudes and triple product asymmetries in the B_s^0 -> phi phi decay

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