We search for the Z 1(4050) + and Z 2(4250) + states, reported by the Belle Collaboration, decaying to χ c1π + in the decays B ̄0→χ c1K -π + and B +→χ c1KS0π + where χ c1→J/ψγ. 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 429fb -1. In this analysis, we model the background-subtracted, efficiency-corrected χ c1π + mass distribution using the Kπ mass distribution and the corresponding normalized Kπ Legendre-polynomial moments, and then test the need for the inclusion of resonant structures in the description of the χ c1π + 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. © 2012 American Physical Society.
Search for the Z 1(4050) + and Z 2(4250) + states in B ̄0→χ c1K -π + and B +→χ c1KS0π +
BETTONI, Diego;BOZZI, Concezio;CALABRESE, Roberto;CIBINETTO, Gianluigi;FIORAVANTI, Elisa;GARZIA, Isabella;LUPPI, Eleonora;SANTORO, Valentina;
2012
Abstract
We search for the Z 1(4050) + and Z 2(4250) + states, reported by the Belle Collaboration, decaying to χ c1π + in the decays B ̄0→χ c1K -π + and B +→χ c1KS0π + where χ c1→J/ψγ. 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 429fb -1. In this analysis, we model the background-subtracted, efficiency-corrected χ c1π + mass distribution using the Kπ mass distribution and the corresponding normalized Kπ Legendre-polynomial moments, and then test the need for the inclusion of resonant structures in the description of the χ c1π + 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. © 2012 American Physical Society.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
