Search for the Z(4430)^- at BABAR

Abstract

We report the results of a search for $Z(4430{)}^{-}$ decay to $J/\psi {\pi }^{-}$ or $\psi (2S){\pi }^{-}$ in $B^{-,0}\to \jpsiπ^- K^{0,+}$ and $B^{-,0}\to \psitwos π^- K^{0,+}$ decays. The data were collected with the BABAR detector at the SLAC PEP-II asymmetric-energy $e^{+}{e}^{-}$ collider operating at center of mass energy 10.58 \gev, and the sample corresponds to an integrated luminosity of 413 fb${}^{-1}$. Each $K\pi$ mass distribution exhibits clear $K^{\ast }(892)$ and $K_2^{\ast }(1430)$ signals, and the efficiency-corrected spectrum is well-described by a superposition of the associated Breit-Wigner intensity distributions, together with an $S$-wave contribution obtained from the LASS $I=1/2$ $K\pi$ scattering amplitude measurements. Each $K\pi$ angular distribution varies significantly in structure with $K\pi$ mass, and is represented in terms of low-order Legendre polynomial moments. We find that each $J/\psi \pi$ or $\psi (2S)\pi$ mass distribution is well-described by the reflection of the measured $K\pi$ mass and angular distribution structures. We see no significant evidence for a $Z(4430{)}^{-}$ signal for any of the processes investigated, neither in the total $J/\psi \pi$ or $\psi (2S)\pi$ mass distribution, nor in the corresponding distributions for the regions of $K\pi$ mass for which observation of the $Z(4430{)}^{-}$ signal was reported. We obtain branching fraction upper limits $\mathcal{B}(B^{-}\to Z^{-}\overline{K^0},Z^{-}\to J/\psi {\pi }^{-})<1.5\times 10^{-5}$, $\mathcal{B}(B^0\to Z^{-}{K}^{+},Z^{-}\to J/\psi {\pi }^{-})<0.4\times 10^{-5}$, $\mathcal{B}(B^{-}\to Z^{-}\overline{K^0},Z^{-}\to \psi (2S){\pi }^{-})<4.7\times 10^{-5}$, and $\mathcal{B}(B^0\to Z^{-}{K}^{+},Z^{-}\to \psi (2S){\pi }^{-})<3.1\times 10^{-5}$ at 95% confidence level, where the $Z(4430{)}^{-}$ mass and width have been fixed to the reported central values.

37 pages, 36 figures Submitted to Phys. Rev. D

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