The cross section for open-beauty production in photon-photon collisions is measured using the whole high-energy and high-luminosity data sample collected by the L3 detector at LEP. This corresponds to 627/pb of integrated luminosity for electron-positron

80

60

Events/5 GeV

40

20

Wvis (GeV)

100

75

Events/5 GeV

50

25

Wvis (GeV)

+ +

Figure2:Visible-massspectrafortheselectedee→eehadronseventscontaining(a)an√electronor(b)amuoncandidateat