Measurement of the B-0(B)over-bar-(0) oscillation frequency using l(-)D *(+) pairs and lepton flavor tags

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doi:10.1103/PhysRevD.60.112004

The oscillation frequency Delta m(d) of B-0(B) over bar(0) mixing is measured using the partially reconstructed semileptonic decay (B) over bar(0) --> l(-) <(nu)over bar>D*(+) X. The data sample was collected with the CDF detector at the Fermilab Tevatron collider during 1992-1995 by triggering on the existence of two lepton candidates in an event, and corresponds to about 110 pb(-1) of (p) over bar p collisions at root s = 1.8 TeV. We estimate the proper decay time of the (B) over bar(0) meson from the measured decay length and reconstructed momentum of the l(-) D*(+) system. The charge of the lepton in the final state identifies the flavor of the (B) over bar(0) meson at its decay. The second lepton in the event is used to infer the flavor of the (B) over bar(0) meson at production. We measure the oscillation frequency to be Delta m(d)=0.516 +/- 0.099(-0.035)(+0.029) ps(-1), where the first uncertainty is statistical and the second is systematic. [S0556-2821(99)04623-8].