Inclusive and exclusive measurements of $B$ decays to ${\chi }_{c1}$ and ${\chi }_{c2}$ at Belle

Abstract

We report inclusive and exclusive measurements for ${\chi }_{c1}$ and ${\chi }_{c2}$ production in $B$ decays. We measure $\mathcal{B}(B\to {\chi }_{c1}X)$= $(3.03 \pm 0.05(\mbox{stat}) \pm 0.24(\mbox{syst})) \times 10^{-3}$ and $\mathcal{B}(B\to {\chi }_{c2}X)$= $(0.70 \pm 0.06(\mbox{stat}) \pm 0.10(\mbox{syst})) \times 10^{-3}$. For the first time, ${\chi }_{c2}$ production in exclusive $B$ decays in the modes $B^0\to {\chi }_{c2}{\pi }^{-}{K}^{+}$ and $B^{+}\to {\chi }_{c2}{\pi }^{+}{\pi }^{-}{K}^{+}$ has been observed, along with first evidence for the $B^{+}\to {\chi }_{c2}{\pi }^{+}{K}_S^0$ decay mode. For ${\chi }_{c1}$ production, we report the first observation in the $B^{+}\to {\chi }_{c1}{\pi }^{+}{\pi }^{-}{K}^{+}$, $B^0\to {\chi }_{c1}{\pi }^{+}{\pi }^{-}{K}_S^0$ and $B^0\to {\chi }_{c1}{\pi }^0{\pi }^{-}{K}^{+}$ decay modes. Using these decay modes, we observe a difference in the production mechanism of ${\chi }_{c2}$ in comparison to ${\chi }_{c1}$ in $B$ decays. In addition, we report searches for $X(3872)$ and ${\chi }_{c1}(2P)$ in the $B^{+}\to ({\chi }_{c1}{\pi }^{+}{\pi }^{-})K^{+}$ decay mode. The reported results use $772\times 10^6$ $B\overline{B}$ events collected at the ${\rm Y}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider.

arXiv comment14 Pages, 8 Figures,4 Tables; Published in PRD 93, 052016 (2016)

References in corpus (20)

• Big-Bang Nucleosynthesis
• A Unified Approach to the Classical Statistical Analysis of Small Signals
• sPlot: a statistical tool to unfold data distributions
• Determination of the X(3872) meson quantum numbers
• Low-energy Universality and the New Charmonium Resonance at 3870 MeV
• Observation of two resonance-like structures in the pi+ chi_c1 mass distribution in exclusive B0-bar --> K- pi+ chi_c1 decays
• Analysis of the Quantum Numbers $J^{PC}$ of the X(3872) Particle
• An inclusive measurement of the photon energy spectrum in b->s gamma decays
• Evidence for X(3872) --> psi(2S) gamma in B+/- --> X(3872) K+/- decays, and a study of B --> ccbar gamma K
• Bounds on the width, mass difference and other properties of X(3872) --> pi+pi-J/psi decays
• Estimate for the X(3872) to gamma J/psi decay width
• Observation of $X(3872)\to J/\psi \gamma$ and search for $X(3872)\to {\psi }^{\prime }\gamma$ in B decays
• P-Wave Charmonium Production in B-Meson Decays
• Study of Inclusive Production of Charmonium Mesons in B Decay
• Time-Dependent CP-Violating Asymmetries in b -> s qbar q Transitions
• Measurement of Branching Fractions and Charge Asymmetries for Two-Body B Meson Decays with Charmonium
• Study of the K+ pi+ pi- Final State in B+ -> J/psi K+ pi+ pi- and B+ -> psi-prime K+ pi+ pi-
• Observation of $B_s^0\to {\chi }_{c1}\varphi$ decay and study of $B^0\to {\chi }_{c1,2}{K}^{\ast 0}$ decays
• Observation of chi_c2 Production in B-meson Decay
• Measurement of Branching Fractions for $B\to {\chi }_{c1(2)}K(K^{\ast })$ at Belle

Cited by in corpus (21)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• The $XYZ$ states: experimental and theoretical status and perspectives
• Exotics: Heavy Pentaquarks and Tetraquarks
• 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
• Observation of the decays ${\Lambda }_b^0\to {\chi }_{c1}p{K}^{-}$ and ${\Lambda }_b^0\to {\chi }_{c2}p{K}^{-}$
• Exploring the resonances $X(4140)$ and $X(4274)$ through their decay channels
• Measurements of the absolute branching fractions of $B^{+}\to X_{c\bar{c}}{K}^{+}$ and $B^{+}\to {\bar{D}}^{(\ast )0}{\pi }^{+}$ at Belle
• Correlation of the hidden-charm molecular tetraquarks and the charmoniumlike structures existing in the $B\to XYZ+K$
• Probing the $P$-wave charmonium decays of $B_c$ meson
• Where are ${\chi }_{cJ}(3P)$?
• Triangle singularities in ${\bar{B}}^0\to {\chi }_{c1}{K}^{-}{\pi }^{+}$ relevant to $Z_1(4050)$ and $Z_2(4250)$
• Search for $X(3872)$ and $X(3915)$ decay into ${\chi }_{c1}{\pi }^0$ in $B$ decays at Belle
• Study of charmonium decays to $K_S^{0}K\pi$ in the $B\to (K_S^{0}K\pi )K$ channels
• Decay properties of the $X(3872)$ through the Fierz rearrangement
• Search for the decay ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}{\chi }_{c1}$
• $S$-wave contributions to the $B_{(s)}\to {\chi }_{c1}(\pi \pi ,K\pi ,KK)$ decays
• Statistical biases in measurements with multiple candidates
• Observation of the decay $\overline{B_s^0}\to {\chi }_{c2}{K}^{+}{K}^{-}$ in the $\phi$ mass region
• Study of charmonium production using decays to hadronic final states with the LHCb experiment
• The virtual contributions from $K^{\ast }$ in the $B\to K^{\ast }\pi h$ and $B\to K\rho h$ decays