In a data sample of four million hadronic Z decays collected with the ALEPH detector at LEP, four Lambda(b) baryon candidates are exclusively reconstructed in the Lambda(b) --> Lambda(c)(+) pi(-) channel, with the Lambda(c)(+) decaying into pK(-) pi(+), p(K)over bar (0) or Lambda pi(+) pi(+) pi(-). The probability of the observed signal to be due to a background fluctuation is estimated to be 4.2 x 10(-4). The mass of the Lambda(b) is measured to be 5614 +/- 21 (stat.) +/- 4 (syst.) MeV/c(2).
Measurement of the mass of the Lambda(b) baryon
BATIGNANI, GIOVANNI;BETTARINI, STEFANO;CIOCCI, MARIA AGNESE;FERRANTE, ISIDORO;FORTI, FRANCESCO;GIORGI, MARCELLO;MESSINEO, ALBERTO MARIA;RIZZO, GIULIANA;TONELLI, GUIDO EMILIO;
1996-01-01
Abstract
In a data sample of four million hadronic Z decays collected with the ALEPH detector at LEP, four Lambda(b) baryon candidates are exclusively reconstructed in the Lambda(b) --> Lambda(c)(+) pi(-) channel, with the Lambda(c)(+) decaying into pK(-) pi(+), p(K)over bar (0) or Lambda pi(+) pi(+) pi(-). The probability of the observed signal to be due to a background fluctuation is estimated to be 4.2 x 10(-4). The mass of the Lambda(b) is measured to be 5614 +/- 21 (stat.) +/- 4 (syst.) MeV/c(2).File in questo prodotto:
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