ep - e x / 02 06 00 2 v 1 3 1 M ay 2 00 2 Observation of the η c ( 2 S ) in exclusive B → KK S K − π + decays
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چکیده
We report the observation of a narrow peak in the KSK −π+ invariant mass distribution in a sample of exclusive B → KKSKπ decays collected with the Belle detector at the KEKB asymmetric e+e− collider. The measured mass of the peak is M = 3654±6(stat)±8(syst) MeV/c2 and we place a 90% confidence level upper limit on the width of Γ < 55 MeV/c2. The properties agree with heavy-quark potential model expectations for the ηc(2S) meson, the n = 2 singlet S charmonium state. Typeset using REVTEX
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تاریخ انتشار 2002