Precise measurement of the $f_s/f_d$ ratio of fragmentation fractions and of $B_s^0$ decay branching fractions

Abstract

The ratio of the $B_s^0$ and $B^0$ fragmentation fractions, $f_s/f_d$, in proton-proton collisions at the LHC, is obtained as a function of $B$-meson transverse momentum and collision centre-of-mass energy from the combined analysis of different $B$-decay channels measured by the LHCb experiment. The results are described by a linear function of the meson transverse momentum, or with a function inspired by Tsallis statistics. Precise measurements of the branching fractions of the $B_s^0\to J/\psi \varphi$ and $B_s^0\to D_s^{-}{\pi }^{+}$ decays are performed, reducing their uncertainty by about a factor of two with respect to previous world averages. Numerous $B_s^0$ decay branching fractions, measured at the LHCb experiment, are also updated using the new values of $f_s/f_d$ and branching fractions of normalisation channels. These results reduce a major source of systematic uncertainty in several searches for new physics performed through measurements of $B_s^0$ branching fractions.

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-046.html (LHCb public pages)

References in corpus (20)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Measurements of Strange Particle Production in $p+p$ Collisions at $\sqrt{s}$= 200 GeV
• Branching Ratio Measurements of $B_s$ Decays
• Observation of a new charged charmoniumlike state in B -> J/psi K pi decays
• Heavy-Quark Expansion for ${\bar{B}}_s\to D_s^{(\ast )}$ Form Factors and Unitarity Bounds beyond the $SU(3{)}_F$ Limit
• Measurement of the ratio of branching fractions BR(B0 -> K*0 gamma)/BR(Bs0 -> phi gamma) and the direct CP asymmetry in B0 -> K*0 gamma
• Measurement of the Decay B_s^0 -> D_s^- pi^+ and Evidence for B_s^0 -> D_s^{+/-} K^{-/+} in e+e- Annihilation at sqrt(s)~10.87 GeV
• A puzzle in ${\bar{B}}_{(s)}^0\to D_{(s)}^{(\ast )+}\{{\pi }^{-},K^{-}\}$ decays and extraction of the $f_s/f_d$ fragmentation fraction
• Amplitude analysis and branching fraction measurement of $D_s^{+}\to K^{+}{K}^{-}{\pi }^{+}$
• Measurement of $f_s/f_u$ variation with proton-proton collision energy and $B$-meson kinematics
• Observation of the decay $B_s^0\to \varphi {\pi }^{+}{\pi }^{-}$ and evidence for $B^0\to \varphi {\pi }^{+}{\pi }^{-}$
• Observation of the annihilation decay mode $B^0\to K^{+}{K}^{-}$
• Measurements of the branching fractions of the decays $B_s^0\to D_s^{\mp }{K}^{\pm }$ and $B_s^0\to D_s^{-}{\pi }^{+}$
• Study of $\eta -{\eta }^{\prime }$ mixing from measurement of $B_{(s)}^0\to J/\psi {\eta }^{(\prime )}$~decay rates
• Updated branching fraction measurements of $B_{(s)}^0\to K_{\mathrm{S}}^0{h}^{+}{h}^{\prime -}$ decays
• First observation of the decays ${\bar{B}}_{(s)}^0\to D_s^{+}{K}^{-}{\pi }^{+}{\pi }^{-}$ and ${\bar{B}}_s^0\to D_{s1}(2536{)}^{+}{\pi }^{-}$
• Measurement of the branching fraction of the decay $B_s^0\to K_S^0{K}_S^0$
• Measurement of the branching fraction of the $B^0\to D_s^{+}{\pi }^{-}$ decay
• Observation of the $B_s^0\to J/\psi K_{\mathrm{S}}^0{K}^{\pm }{\pi }^{\mp }$ decay
• Observation of the $B_s^0\to D^{\ast \pm }{D}^{\mp }$ decay

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