New results concerning the detection of (p) over bar d Pontecorvo reactions at rest with hidden and open strangeness in the final state are presented. A very selective 2-prong dedicated trigger has been used to collect a sample of about 8.5 x 10(6) annihilations. Evidence of the reaction (p) over bar d --> phi n is shown with a branching ratio of [5.3 +/- 0.6(stat.) +/- 0.3(syst.)] x 10(-6). Moreover, the reactions (p) over bar d --> Lambda K* and (p) over bar d --> Lambda K-L(0) have been identified through the reconstruction of the decay Lambda(0) --> p pi(-). The preliminary result for the branching ratio is Br((p) over bar d --> Lambda(0)K(L)(0)) = [5 +/- 1(stat.)+/- 2(syst)] x 10(-7).
Strangeness production in (p)over-bar-d Pontecorvo reactions at rest
BALESTRA, Ferruccio;BOTTA, Elena;BRESSANI, Tullio;BUSSA, Maria Pia;BUSSO, Luigi;COSTA, Sergio;FERRERO, Livio;GARFAGNINI, Raffaello;GRASSO, Antonino;MARCELLO, Simonetta;PANZIERI, Daniele;ZOSI, Gianfranco;
1996-01-01
Abstract
New results concerning the detection of (p) over bar d Pontecorvo reactions at rest with hidden and open strangeness in the final state are presented. A very selective 2-prong dedicated trigger has been used to collect a sample of about 8.5 x 10(6) annihilations. Evidence of the reaction (p) over bar d --> phi n is shown with a branching ratio of [5.3 +/- 0.6(stat.) +/- 0.3(syst.)] x 10(-6). Moreover, the reactions (p) over bar d --> Lambda K* and (p) over bar d --> Lambda K-L(0) have been identified through the reconstruction of the decay Lambda(0) --> p pi(-). The preliminary result for the branching ratio is Br((p) over bar d --> Lambda(0)K(L)(0)) = [5 +/- 1(stat.)+/- 2(syst)] x 10(-7).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.