Time dependent B{sup 0} {anti B}{sup 0} mixing at CDF Page: 1 of 7
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Time Dependent B0B0 Mixing at CDF a
Fritz DeJongh
Fermilab, PO Box 500 ms 318, Batavia IL 60510
George Michail
o Harvard University, 44 Oxford St., Cambridge MA 02138
We describe two measurements of Amd. The first uses B -> vtD(*) events and
Cl a same-side flavor tagging algorithm. The second uses dilepton events. From the
average of these two measurements we find Amd = 0.466 + 0.037 + 0.031 ps-1.
1 Introduction
Measurements of the frequencies for Bd and Bs mesons to oscillate into Rd and
o Bs, respectively, can potentially constrain the magnitudes of the CKM matrix
C] elements Vt8 and Vtd. These frequencies are proportional to Amd and Am8,
the mass differences between the CP eigenstates of the Bd and B mesons.
Recent measurements have provided precise determinations of Amd and lower
limits on Am8 1. The large bI cross-section in pp collisions at Vs = 1.8 GeV
has enabled the reconstruction of large B signals using the CDF detector 2.
The measurement of a time-dependent mixing probability is made possible by
a precise decay length measurement from the Silicon Vertex Detector (SVX) 3.
The charges of the decay products tag the flavor of the B at the time of decay.
To tag the flavor of the B at production, several tagging algorithms have been
developed. The measurement of the mistag probabilities of these algorithms is
also useful for future measurements of CP violation4.
We present herein two measurements of the Bd mixing frequency. The first
uses semileptonic B decays in which the charm has been fully reconstructed,
and a same-side flavor tagging algorithm using correlations between B mesons
and charged tracks. Such correlations have been observed at LEP 5 and in
B -> J/4K events at CDF 6. The second uses semileptonic B decays
in which the charm has been inclusively reconstructed, and a flavor tagging
algorithm using the semileptonic decay of the other B in the event.
aSubmitted to the Proceedings of the 1996 Meeting of the Division of Particles and Fields,
American Pbysical Society, Minneapolis MN, August 10-15, 1996.1
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CDF Collaboration. Time dependent B{sup 0} {anti B}{sup 0} mixing at CDF, article, November 1, 1996; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc679648/m1/1/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.