F. Abe

Observation of HadronicWDecays intt¯Events with the Collider Detector at Fermilab

We observe hadronic W decays in t{ovr t}{yields}W({yields}{ell}V)+{>=}4 jet events using a 109 pb{sup -1} data sample of p{ovr p}{sup -1} data sample of p{ovr p} collisions at sqrt[s] = 1.8 TeV collected with the Collider Detector at Fermilab. A peak in the dijet invariant mass distribution is obtained that is consistent with W decay and inconsistent with the background prediction by 3.3 {sigma}. From this peak we measure the W mass to be 77.2{+-}4.6(stat+syst) GeV/c{sup 2}. This result demonstrates the presence of a second W boson in t{ovr t} candidates in the W({yields}{ell}v)+{>=}4 jet channel.

Search for B{sup degree ovr sub s}-{ovr B}{sup degree ovr sub s} oscillations using the semileptonic decay B{sup degree ovr sub s} {r_arrow} {phi} {ell} {sup +}X{nu}.

A search for B{sub s}{sup 0}-{ovr B}{sub s}{sup 0} oscillations is performed in a sample of B{sub s}{sup 0} semileptonic decays collected using dilepton triggers at the Tevatron Collider during 1992-1995. The B{sub s}{sup 0} is reconstructed using phiv meson-lepton correlations; its initial flavor is determined with the second lepton in the event. From a signal of 1068 with a B{sub s}{sup 0} purity of 61%, we obtain a limit on the B{sub 2}{sup 0}-{ovr B}{sub s}{sup 0} oscillation frequency of {Delta}m{sub s}>5.8 ps{sup -1} at 95% confidence level.

Measurement of the B{sup degree}-{ovr B}{sup degree} flavor oscillations using jet-charge and lepton flavor tagging in p{ovr p} collisions at {radical ovr s} = 1.8 TeV.

We present a measurement of the mass difference {Delta}m{sub d} for the B{sup 0} meson and the statistical power of the b flavor tagging methods used. The measurement uses 90 pb{sup -1} of data from p{ovr p} collisions at sqrt[s]=1.8 TeV collected with the CDF detector. An inclusive lepton trigger is used to collect a large sample of B hadron semileptonic decays. The mass difference {Delta}m{sub d} is determined from the proper time dependence of the fraction of B hadrons that undergo flavor oscillations. The flavor at decay is inferred from the charge of the lepton from semileptonic B decay. The initial flavor is inferred by determining the flavor of the other B hadron produced in the collision, either from its semileptonic decay (soft-lepton tag) or from its jet charge. The measurement yields {Delta}m{sub d}=(0.500{+-}0.052{+-}0.043){Dirac_h} ps{sup -1}, where the first uncertainty is statistical and the second uncertainty is systematic. The statistical powers ({var_epsilon}D{sup 2}) of the soft-lepton and jet-charge flavor taggers are (0.91{+-}0.10{+-}0.11)% and (0.78{+-}0.12{+-}0.08)%, respectively.

Measurement of the CP-violation parameter sin(2{beta}) in B{sup 0}{sub d}/{ovr B}{sup 0}{sub d} {yields} J/{psi}K{sup 0}{sub s} decays.

We present a measurement of the time-dependent asymmetry in the rate for {ovr B}{sub d}{sup 0} versus B{sub d}{sup 0} decays to J/{psi}K{sub s}{sup 0}. A nonzero asymmetry would be an indication of CP violation, and within the standard model this may be used to measure the CP-violation parameter sin(2{beta}). A total of 198{+-}17 B{sub d}{sup 0}/{ovr B}{sub d}{sup 0} decays were observed in p{ovr p} collisions at sqrt[s] = 1.8 TeV by the CDF detector at the Fermilab Tevatron. B{sub d}{sup 0} and {ovr B}{sub d}{sup 0} are distinguished by a technique based on charge correlations from hadronization of the b quark. Our analysis results in sin(2{beta}) = 1.8{+-}1.1(stat){+-}0.3(syst).We present a measurement of the time-dependent asymmetry in the rate for

Measurement of the B{sup 0}-{ovr B}{sup 0} oscillation frequency using {pi} -B meson charge-flavor correlations in p{ovr p} collisions at {radical}{ovr s} = 1.8 TeV.

\bar{B}{^0_d}

Search for the decays B{sup 0}{sub s}, B{sup 0}{sub d} {yields} e{+-}{mu}{-+} and Pati-Salam leptoquarks.

versus

Searches for new physics in diphoton events in p{ovr p} collisions at {radical}{ovr s} = 1.8 TeV.

B^0_d

Observation of the B{sub_c} Meson in p{ovr p} collisions at {radical}{ovr s} = 1.8 TeV.

decays to

Search for long-lived parents of Z{sup 0} bosons in p{ovr p} collisions at {radical}{ovr s} = 1.8 TeV.

J/\psi K^0_S

Observation of B{sup +}{yields}{psi}(2S)K{sup +} and B{sup 0} {yields}{psi}(2S)K{sup *}(892){sup 0} decays and measurements of B-meson branching fractions into J/{psi} and {psi}(2S) final states.

. In the context of the Standard Model this is interpreted as a measurement of the CP-violation parameter