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

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 $B_s^0 \to \phi \phi$ branching fraction is measured to be $\mathcal{B}(B_s^0 \to \phi \phi) = ( 1.84 \pm 0.05 (\text{stat}) \pm 0.07 (\text{syst}) \pm 0.11 (f_s/f_d) \pm 0.12 (\text{norm}) ) \times 10^{-5},$ where $f_s/f_d$ represents the ratio of the $B_s^0$ to $B^0$ production cross-sections, and the $B^0 \to \phi K^*(892)^0$ 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 $B^0 \to \phi \phi$ is also made. No signal is observed, and an upper limit on the branching fraction is set as $\mathcal{B}(B^0 \to \phi \phi) < 2.8 \times 10^{-8}$ at 90% confidence level. This is a factor of seven improvement compared to the previous best limit.

http://hal.in2p3.fr/in2p3-01184641
Contributor : Danielle Cristofol <>
Submitted on : Monday, August 17, 2015 - 10:45:51 AM
Last modification on : Friday, May 29, 2020 - 12:56:02 PM

Citation

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, et al.. Measurement of the $B_s^0 \to \phi \phi$ branching fraction and search for the decay $B^0 \to \phi \phi$. Journal of High Energy Physics, Springer Verlag (Germany), 2015, 10, pp.053. ⟨10.1007/JHEP10(2015)053⟩. ⟨in2p3-01184641⟩

Record views