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Abstract: We report the results of a search for $Z4430^-$ decay to $J-\psi\pi^-$ or$\psi2S\pi^-$ in $B^{-,0}\to \jpsi\pi^- K^{0,+}$ and $B^{-,0}\to \psitwos\pi^- K^{0,+}$ decays. The data were collected with the BABAR detector at theSLAC PEP-II asymmetric-energy $e^+e^-$ collider operating at center of massenergy 10.58 \gev, and the sample corresponds to an integrated luminosity of413 fb$^{-1}$. Each $K\pi$ mass distribution exhibits clear $K^{\ast}892$ and$K^{\ast} 21430$ signals, and the efficiency-corrected spectrum iswell-described by a superposition of the associated Breit-Wigner intensitydistributions, together with an $S$-wave contribution obtained from the LASS$I=1-2$ $K\pi$ scattering amplitude measurements. Each $K\pi$ angulardistribution varies significantly in structure with $K\pi$ mass, and isrepresented in terms of low-order Legendre polynomial moments. We find thateach $J-\psi\pi$ or $\psi2S\pi$ mass distribution is well-described by thereflection of the measured $K\pi$ mass and angular distribution structures. Wesee no significant evidence for a $Z4430^-$ signal for any of the processesinvestigated, neither in the total $J-\psi\pi$ or $\psi2S\pi$ massdistribution, nor in the corresponding distributions for the regions of $K\pi$mass for which observation of the $Z4430^-$ signal was reported. We obtainbranching fraction upper limits ${\cal{B}}B^-\to Z^-\bar{K^0}, Z^-\toJ-\psi\pi^-<1.5\times 10^{-5}$, ${\cal{B}}B^0\to Z^-K^+, Z^-\toJ-\psi\pi^-<0.4\times 10^{-5}$, ${\cal{B}}B^-\to Z^-\bar{K^0}, Z^-\to\psi2S\pi^-<4.7\times 10^{-5}$, and ${\cal{B}}B^0\to Z^-K^+, Z^-\to\psi2S\pi^-<3.1\times 10^{-5}$ at 95% confidence level, where the$Z4430^-$ mass and width have been fixed to the reported central values.



Autor: The BABAR Collaboration: B. Aubert, et al

Fuente: https://arxiv.org/







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