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Published April 1, 2011 | Published
Journal Article Open

Measurement of the mass and width of the D_(s1)(2536)^+ meson


The decay width and mass of the D_(s1)(2536)^+ meson are measured via the decay channel D_(s1) + →D^(*+)K_(S)^0 using 385 fb^(-1) of data recorded with the BABAR detector in the vicinity of the Υ(4S) resonance at the PEP-II asymmetric-energy electron-positron collider. The result for the decay width is Γ(D_(s1)^+) = 0.92 ± 0.03(stat.) ± 0.04(syst.) MeV. For the mass, a value of m(D_(s1)^+) = 2535.08±0.01(stat.) ± 0.15(syst.) MeV/c^2 is obtained. The mass difference between the D_(s1)^+ and the D^(*+) is measured to be m(D_(s1)^+) - m(D^(*+)) = 524.83 ± 0.01(stat.) ± 0.04(syst.)  MeV/c^2, representing a significant improvement compared to the current world average. The unnatural spin-parity assignment for the D_(s1)^+ meson is confirmed.

Additional Information

© 2011 American Physical Society. Received 14 March 2011; published 19 April 2011. 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 Educación y Ciencia (Spain), and the Science and Technology Facilities Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union) and the A. P. Sloan Foundation.

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