Search for B decays to final states with the eta_c meson

Abstract

We report a search for $B$ decays to selected final states with the ${\eta }_c$ meson: $B^{\pm }\to K^{\pm }{\eta }_c{\pi }^{+}{\pi }^{-}$, $B^{\pm }\to K^{\pm }{\eta }_c\omega$, $B^{\pm }\to K^{\pm }{\eta }_c\eta$ and $B^{\pm }\to K^{\pm }{\eta }_c{\pi }^0$. The analysis is based on $772\times 10^6$ $B\bar{B}$ pairs collected at the ${\rm Y}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. We set 90\% confidence level upper limits on the branching fractions of the studied $B$ decay modes, independent of intermediate resonances, in the range $(0.6-5.3)\times 10^{-4}$. We also search for molecular-state candidates in the $D^0{\bar{D}}^{\ast 0}-{\bar{D}}^0{D}^{\ast 0}$, $D^0{\bar{D}}^0+{\bar{D}}^0{D}^0$ and $D^{\ast 0}{\bar{D}}^{\ast 0}+{\bar{D}}^{\ast 0}{D}^{\ast 0}$ combinations, neutral partners of the $Z(3900{)}^{\pm }$ and $Z(4020{)}^{\pm }$, and a poorly understood state $X(3915)$ as possible intermediate states in the decay chain, and set 90\% confidence level upper limits on the product of branching fractions to the mentioned intermediate states and decay branching fractions of these states in the range $(0.6-6.9)\times 10^{-5}$.

11 pages, 12 figures, accepted to JHEP

References in corpus (4)

• Big-Bang Nucleosynthesis
• X(3872) and Other Possible Heavy Molecular States
• Evidence for the decay $X(3872)\to \psi (2S)\gamma$
• Hadronic molecule structure of the Y(3940) and Y(4140)

Cited by in corpus (12)

• The $XYZ$ states: experimental and theoretical status and perspectives
• Non-Standard Heavy Mesons and Baryons, an Experimental Review
• ${\chi }_{c0}^{}(3915)$ As the Lightest $c\bar{c}s\bar{s}$ State
• Spectrum of the Hidden-Bottom and the Hidden-Charm/Strange Exotics in the Dynamical Diquark Model
• Probing the nature of Z_c states via the eta_c rho decay
• $X(3915)$ as a $D_s{\bar{D}}_s$ bound state
• Study of the hidden charm $D{\bar{D}}^{\ast }$ interactions in chiral effective field theory
• Study of the $B^{-}\to K^{-}\eta {\eta }_c$ decay due to the $D\bar{D}$ bound state
• The XYZ mesons: what they aren't
• Comment on the X(3915) nonstandard hadron candidate
• Development of Bethe-Salpeter theory for dealing with unstable system
• Calculation of mass and width of unstable molecular state using the developed Bethe-Salpeter theory