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The decay width and mass of the Ds1(2536)+ meson are measured via the decaychannel Ds1+ -> D*+KS0 using 385 fb^-1 of data recorded with the BABAR detectorin the vicinity of the Y(4S) resonance at the PEP-II asymmetric-energyelectron-positron collider. The result for the decay width is 0.92 +- 0.03(stat) +- 0.04 (syst) MeV. For the mass, a value of 2535.08 +- 0.01 +- 0.15MeV/c^2 is obtained. The mass difference between the Ds1+ and the D*+ ismeasured to be 524.83 +- 0.01 +- 0.04 MeV/c^2, representing a significantimprovement compared to the current world average. The unnatural spin-parityassignment for the Ds1+ meson is confirmed.

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