Measurement of the mass and width of the Ds1(2536)+ meson

J. P. Lees et al. (BABAR Collaboration)
Phys. Rev. D 83, 072003 – Published 19 April 2011

Abstract

The decay width and mass of the Ds1(2536)+ meson are measured via the decay channel Ds1+D*+KS0 using 385fb1 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(Ds1+)=0.92±0.03(stat.)±0.04(syst.)MeV. For the mass, a value of m(Ds1+)=2535.08±0.01(stat.)±0.15(syst.)MeV/c2 is obtained. The mass difference between the Ds1+ and the D*+ is measured to be m(Ds1+)m(D*+)=524.83±0.01(stat.)±0.04(syst.)MeV/c2, representing a significant improvement compared to the current world average. The unnatural spin-parity assignment for the Ds1+ meson is confirmed.

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  • Received 14 March 2011

DOI:https://doi.org/10.1103/PhysRevD.83.072003

© 2011 American Physical Society

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Vol. 83, Iss. 7 — 1 April 2011

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