English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

A search for the rare decays $B_s^0 \to \pi^+\pi^-\mu^+\mu^-$ and $B^0 \to\pi^+\pi^-\mu^+\mu^-$ is performed in a data set corresponding to an integratedluminosity of 3.0 fb$^{-1}$ collected by the LHCb detector in proton-protoncollisions at centre-of-mass energies of 7 and 8 TeV. Decay candidates withpion pairs that have invariant mass in the range 0.5-1.3 GeV/$c^2$ and withmuon pairs that do not originate from a resonance are considered. The firstobservation of the decay $B_s^0 \to \pi^+\pi^-\mu^+\mu^-$ and the firstevidence of the decay $B^0 \to \pi^+\pi^-\mu^+\mu^-$ are obtained and thebranching fractions, restricted to the dipion-mass range considered, aremeasured to be $\mathcal{B}(B_s^0 \to \pi^+\pi^-\mu^+\mu^-)=(8.6\pm 1.5\,({\rmstat}) \pm 0.7\,({\rm syst})\pm 0.7\,({\rm norm}))\times 10^{-8}$ and$\mathcal{B}(B^0 \to \pi^+\pi^-\mu^+\mu^-)=(2.11\pm 0.51\,({\rm stat}) \pm0.15\,({\rm syst})\pm 0.16\,({\rm norm}) )\times 10^{-8}$, where the thirduncertainty is due to the branching fraction of the decay $B^0\to J/\psi(\to\mu^+\mu^-)K^*(890)^0(\to K^+\pi^-)$, used as a normalisation.

Study of the rare $B_s^0$ and $B^0$ decays into the $\pi^+\pi^-\mu^+\mu^-$ final state