First observation of $B_s^0\to J/\psi \eta$ and $B_s^0\to J/\psi {\eta }^{\prime }$

Abstract

We report first observations of $B_s^0\to J/\psi \eta$ and $B_s^0\to J/\psi {\eta }^{\prime }$. The results are obtained from 121.4 fb^{-1} of data collected at the ${\rm Y}(5S)$ resonance with the Belle detector at the KEKB $e^{+}{e}^{-}$ collider. We obtain the branching fractions Br(B_s^0\to J/ψη)= [5.10\pm 0.50(stat.)\pm 0.25(syst.)^{+1.14}_{-0.79}(N_{B_s^(*)\bar B_s^(*))] \times 10^{-4}, and Br(B_s^0\to J/ψη')=[3.71\pm 0.61(stat.)\pm 0.18(syst.)^{+0.83}_{-0.57}(N_{B_s^(*)\bar B_s^(*))] \times 10^{-4}. The ratio of the two branching fractions is measured to be $\frac{Br(B_s\to J/\psi {\eta }^{\prime })}{Br(B_s\to J/\psi \eta )}=0.73\pm 0.14(stat.)\pm 0.02(syst.)$.

5 pages, 3 figures, 2 tables

References in corpus (11)

• In Pursuit of New Physics with B_s Decays
• A global fit to determine the pseudoscalar mixing angle and the gluonium content of the eta' meson
• Composition of the Pseudoscalar Eta and Eta' Mesons
• Observation of $B_s^0\to J/\psi f_0(980)$ and Evidence for $B_s^0\to J/\psi f_0(1370)$
• Nonleptonic $B_s$ to charmonium decays: analyses in pursuit of determining the weak phase ${\beta }_s$
• 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
• Exploring CP Violation and $\eta$-${\eta }^{\prime }$ Mixing with the $B_{s,d}^0\to J/\psi {\eta }^{(\prime )}$ Systems
• Measurement of inclusive $D_s$, $D^0$, and $J/\psi$ rates and determination of the $B_s^{(\ast )}{\bar{B}}_s^{(\ast )}$ production fraction in $b\bar{b}$ events at the Y(5S) resonance
• Evidence for B^(*)_s bar{B}^(*)_s Production at the Upsilon(5S)
• First Evidence and Measurement of B_s^(*) barB_s^(*) Production at the Upsilon(5S)
• Branching ratios for B_{d,s}->J/psi eta and B_{d,s}->eta l+l-, extracting gamma from B_{d,s}->J/psi eta, and possibilities for constraining C_{10A} in semileptonic B decays

Cited by in corpus (16)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• The Status of Glueballs
• Evidence for the decay $B^0\to J/\psi \omega$ and measurement of the relative branching fractions of $B_s^0$ meson decays to $J/\psi \eta$ and $J/\psi {\eta }^{{}^{\prime }}$
• Implications on $\eta$-${\eta }^{\prime }$-glueball mixing from $B_{d/s}\to J/\Psi {\eta }^{{(}^{\prime })}$ Decays
• Observations of $B_s^0\to \psi (2S)\eta$ and $B_{(s)}^0\to \psi (2S){\pi }^{+}{\pi }^{-}$ decays
• Study of $\eta -{\eta }^{\prime }$ mixing from measurement of $B_{(s)}^0\to J/\psi {\eta }^{(\prime )}$~decay rates
• Calibration and performance of the LHCb calorimeters in Run 1 and 2 at the LHC
• Rare $B_s$ decays in the relativistic quark model
• Decays $B_s\to J/\psi +\eta$ and $B_s\to J/\psi +{\eta }^{\prime }$ in the framework of covariant quark model
• Results in $B_s$ physics and bottomonium spectroscopy using the Belle ${\rm Y}(5S)$ data
• The physics of the $\eta$--${\eta }^{\prime }$ system versus $B^0\to J/\Psi \eta ({\eta }^{\prime })$ and $B_s\to J/\Psi \eta ({\eta }^{\prime })$ decays
• An exploration of $B_s\to J/\psi s\bar{s}$
• CP violation with Bs
• CP Violation in Other Bs Decays