Abstract
In a data sample of approximately collected with the D0 detector between 2002 and 2006, the orbitally excited charm state has been observed with a measured mass of via the decay mode . A first measurement is made of the branching ratio product . Assuming that production in semileptonic decay is entirely from , an extraction of the semileptonic branching ratio is made.
- Received 26 December 2007
DOI:https://doi.org/10.1103/PhysRevLett.102.051801
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