Observations of $B_s^0\to \psi (2S)\eta$ and $B_{(s)}^0\to \psi (2S){\pi }^{+}{\pi }^{-}$ decays

Abstract

First observations of the $B_s^0\to \psi (2S)\eta$, $B^0\to \psi (2S){\pi }^{+}{\pi }^{-}$ and $B_s^0\to \psi (2S){\pi }^{+}{\pi }^{-}$ decays are made using a dataset corresponding to an integrated luminosity of 1.0~$f{b}^{-1}$ collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=7$ TeV. The ratios of the branching fractions of each of the $\psi (2S)$ modes with respect to the corresponding $J/\psi$ decays are \[ \frac{\mathcal{B}(B^0_s \rightarrow ψ(2S) η) }{\mathcal{B}(B^0_s \rightarrow J/ψη)} =0.83\pm0.14\,(stat)\pm0.12\,(syst)\pm0.02\,(\mathcalB}), \] \[ \frac{\mathcal{B}(B^0 \rightarrow ψ(2S) π^+ π^-)}{\mathcal{B}(B^0 \rightarrow J/ψπ^+ π^-)} =0.56\pm0.07\,(stat)\pm0.05\,(syst)\pm0.01\,(\mathcal{B}), \] \[ \frac{\mathcal{B}(B^0_s \rightarrow ψ(2S) π^+ π^-)}{\mathcal{B}(B^0_s \rightarrow J/ψπ^+ π^-)} =0.34\pm0.04\,(stat)\pm0.03\,(syst)\pm0.01\,(\mathcal{B}), \] where the third uncertainty corresponds to the uncertainties of the dilepton branching fractions of the $J/\psi$ and $\psi (2S)$ meson decays.

16 pages, 4 figures

References in corpus (11)

• PYTHIA 6.4 Physics and Manual
• The LHCb Trigger and its Performance in 2011
• Performance of the LHCb RICH detector at the LHC
• Performance of the LHCb muon system
• Measurement of the CP-violating phase ${\varphi }_s$ in ${\overline{B}}_s^0\to J/\psi {\pi }^{+}{\pi }^{-}$ decays
• Analysis of the resonant components in B0->J/ψpi+pi-
• Measurement of the CP-violating phase ϕs in Bs->J/ψπ+π- decays
• 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 $J/\psi {\eta }^{{}^{\prime }}$
• Measurement of the $B_s^0\to J/\psi K^{\ast 0}$ branching fraction and angular amplitudes
• Measurement of the $B_s^0\to J/\psi K_S^0$ branching fraction
• Relative rates of B meson decays into psi(2S) and J/psi mesons

Cited by in corpus (21)

• 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
• Evidence for the decay $X(3872)\to \psi (2S)\gamma$
• Observation of $B_c^{+}\to J/\psi D_s^{+}$ and $B_c^{+}\to J/\psi D_s^{\ast +}$ decays
• Precise measurement of the $f_s/f_d$ ratio of fragmentation fractions and of $B_s^0$ decay branching fractions
• The S-wave resonance contributions in the $B_s^0$ decays into $\psi (2S,3S)$ plus pion pair
• Observation of ${\Lambda }_b^0\to \psi (2S)p{K}^{-}$ and ${\Lambda }_b^0\to J/\psi {\pi }^{+}{\pi }^{-}p{K}^{-}$ decays and a measurement of the ${\Lambda }_b^0$ baryon mass
• Study of ${\chi }_b$ meson production in pp collisions at $\sqrt{s}=7$ and 8TeV and observation of the decay ${\chi }_b\to {\rm Y}(3S)\gamma$
• Quasi-two-body decays $B_{(s)}\to P{f}_2(1270)\to P\pi \pi$ in the perturbative QCD approach
• Study of $\eta -{\eta }^{\prime }$ mixing from measurement of $B_{(s)}^0\to J/\psi {\eta }^{(\prime )}$~decay rates
• $P$-wave contributions to $B\to \psi \pi \pi$ decays in perturbative QCD approach
• Quasi-two-body decays $B_{(s)}\to P{D}_0^{\ast }(2400)\to PD\pi$ in the perturbative QCD approach
• $S$-wave resonance contributions to the $B_{(s)}^0\to {\eta }_c(2S){\pi }^{+}{\pi }^{-}$ in the perturbative QCD factorization approach
• Rare $B_s$ decays in the relativistic quark model
• Quasi-two-body decays $B\to {\eta }_c(1S,2S)[\rho (770),\rho (1450),\rho (1700)\to ]\pi \pi$ in the perturbative QCD approach
• Observation of $B_s^0\to {\chi }_{c1}\varphi$ decay and study of $B^0\to {\chi }_{c1,2}{K}^{\ast 0}$ decays
• Branching ratios, $CP$ asymmetries and polarizations of $B\to \psi (2S)V$ decays
• Study of charmonium and charmonium-like contributions in $B^{+}\to J/\psi \eta K^{+}$ decays
• 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
• Observation of the very rare ${\Sigma }^{+}\to p{\mu }^{+}{\mu }^{-}$ decay