Search for the $Z_1(4050)^+$ and $Z_2(4250)^+$ states in $\bar B^0 \to χ_{c1} K^- π^+$ and $B^+ \to χ_{c1} K^0_S π^+$

Details Search for the $Z_1(4050)^+$ and $Z_2(4250)^+$ states in $\bar B^0 \to χ_{c1} K^- π^+$ and $B^+ \to χ_{c1} K^0_S π^+$ Search for the $Z_1(4050)^+$ and $Z_2(4250)^+$ states in $\bar B^0 \to χ_{c1} K^- π^+$ and $B^+ \to χ_{c1} K^0_S π^+$

2011-11-25

arxiv.org/abs/1111.5919v2

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages, 12 postscript figures, to be published in Phys. Rev. D

Scientific paper

We search for the $Z_1(4050)^+$ and $Z_2(4250)^+$ states, reported by the Belle Collaboration, decaying to $\chi_{c1} \pi^+$ in the decays $\bar B^0 \to \chi_{c1} K^- \pi^+$ and $B^+ \to \chi_{c1} K^0_S \pi^+$ where $\chi_{c1} \to \jpsi \gamma$. 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 correspond to an integrated luminosity of 429 fb$^{-1}$. In this analysis, we model the background-subtracted, efficiency-corrected $\chi_{c1}\pi$ mass distribution using the $K \pi$ mass distribution and the corresponding normalized $K \pi$ Legendre polynomial moments, and then test the need for the inclusion of resonant structures in the description of the $\chi_{c1}\pi$ mass distribution. No evidence is found for the $Z_1(4050)^+$ and $Z_2(4250)^+$ resonances, and 90% confidence level upper limits on the branching fractions are reported for the corresponding $B$-meson decay modes.

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