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Published March 16, 2012 | Published
Journal Article Open

Search for the Z_1(4050)^+ and Z_2(4250)^+ states in B̅ ^0→χ_(c1)K^-π^+ and B^+→χ_(c1)K_S^0π^+


We search for the Z_1(4050)^+ and Z_2(4250)^+ states, reported by the Belle Collaboration, decaying to χ_(c1)π^+ in the decays B̅ ^0→χ_(c1)K^-π^+ and B^+→χ_(c1)K_S^0π^+ 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 429  fb^(-1). In this analysis, we model the background-subtracted, efficiency-corrected χ_(c1)π^+ 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_(c1)π^+ 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.

Additional Information

© 2012 American Physical Society. Received 25 November 2011; published 16 March 2012. We are grateful for the extraordinary contributions of our PEP-II colleagues in achieving the excellent luminosity and machine conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and the kind hospitality extended to them. This work is supported by the US Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), the Commissariat à l'Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France), the Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), the Istituto Nazionale di Fisica Nucleare (Italy), the Foundation for Fundamental Research on Matter (The Netherlands), the Research Council of Norway, the Ministry of Education and Science of the Russian Federation, Ministerio de Ciencia e Innovaciόn (Spain), and the Science and Technology Facilities Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union), the A. P. Sloan Foundation (USA), and the Binational Science Foundation (USA-Israel).

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