Search for the Z1(4050)+ and Z2(4250)+ states in B¯0→χc1K−π+ and B+→χc1KS0π+

Le résumé fourni par la source

We search for the ${Z}_{1}(4050{)}^{+}$ and ${Z}_{2}(4250{)}^{+}$ states, reported by the Belle Collaboration, decaying to ${\ensuremath{\chi}}_{c1}{\ensuremath{\pi}}^{+}$ in the decays ${\overline{B}}^{0}\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c1}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ and ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c1}{K}_{S}^{0}{\ensuremath{\pi}}^{+}$ where ${\ensuremath{\chi}}_{c1}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\gamma}$. The data were collected with the BABAR detector at the SLAC PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider operating at center-of-mass energy 10.58 GeV, and correspond to an integrated luminosity of $429\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. In this analysis, we model the background-subtracted, efficiency-corrected ${\ensuremath{\chi}}_{c1}{\ensuremath{\pi}}^{+}$ mass distribution using the $K\ensuremath{\pi}$ mass distribution and the corresponding normalized $K\ensuremath{\pi}$ Legendre-polynomial moments, and then test the need for the inclusion of resonant structures in the description of the ${\ensuremath{\chi}}_{c1}{\ensuremath{\pi}}^{+}$ 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.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.