In a data sample of four million hadronic Z decays collected with the ALEPH detector at LEP, four Λb baryon candidates are exclusively reconstructed in the Λb -> Λ+cπ- channel, with the Λ+c decaying into pK- π+, pK0, or Λπ+ π+ π-. The probability of the observed signal to be due to a background fluctuation is estimated to be 4.2 × 10-4. The mass of the Λb is measured to be 5614 +/- 21 (stat.) +/- 4 (syst.) MeV/c2.
Measurement of the mass of the Λb baryon
GREGORIO, ANNA;BOSISIO, LUCIANO;GIANNINI, GIANROSSANO;
1996-01-01
Abstract
In a data sample of four million hadronic Z decays collected with the ALEPH detector at LEP, four Λb baryon candidates are exclusively reconstructed in the Λb -> Λ+cπ- channel, with the Λ+c decaying into pK- π+, pK0, or Λπ+ π+ π-. The probability of the observed signal to be due to a background fluctuation is estimated to be 4.2 × 10-4. The mass of the Λb is measured to be 5614 +/- 21 (stat.) +/- 4 (syst.) MeV/c2.File in questo prodotto:
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