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Aaij, R; Adeva, B; Adinolfi, M; Adrover, C; Affolder, A; Agari, M; Ajaltouni, Z; Albrecht, J; Alessio, F; Alexander, M; Et. Al
Physics letters. B, 03/2011, Letnik: 698, Številka: 1Journal Article
Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays inline image and inline image are detected. Two structures are observed in the D super(0)K super(+) mass spectrum at masses consistent with the known D sub(s1(2536))u+ and inline image mesons. The measured branching fractions relative to the total inline image semileptonic rate are inline image, and inline image, where the first uncertainty is statistical and the second is systematic. This is the first observation of the inline image state in inline image decays; we also measure its mass and width.
