A search for new particles (X) that decay to electron or muon pairs has been performed using approximately 200 pb{sup -1} of pp collision data at {radical}(s)=1.96 TeV collected by the CDF II ...experiment at the Fermilab Tevatron. Limits on {sigma}(pp{yields}X)BR(X{yields}ll) are presented as a function of dilepton invariant mass m{sub ll}>150 GeV/c{sup 2}, for different spin hypotheses (0, 1, or 2). The limits are approximately 25 fb for m{sub ll}>600 GeV/c{sup 2}. Lower mass bounds for X from representative models beyond the standard model including heavy neutral gauge bosons are presented.
We search for decays of the type B{sub (s)}{sup 0}{yields}h{sup +}h{sup '-} (where h,h{sup '}=K or {pi}) in 180 pb{sup -1} of pp collisions collected at the Tevatron by the upgraded Collider Detector ...at Fermilab. We report the first observation of the new mode B{sub s}{sup 0}{yields}K{sup +}K{sup -} with a yield of 236{+-}32 events, corresponding to (f{sub s}/f{sub d})xB(B{sub s}{sup 0}{yields}K{sup +}K{sup -})/B(B{sup 0}{yields}K{sup +}{pi}{sup -})=0.46{+-}0.08(stat){+-}0.07(syst), where f{sub s}/f{sub d} is the ratio of production fractions of B{sub s}{sup 0} and B{sup 0}. We find results in agreement with world averages for the B{sup 0} modes, and set the following new limits at 90% C.L.: B(B{sub s}{sup 0}{yields}K{sup -}{pi}{sup +})<5.6x10{sup -6} and B(B{sub s}{sup 0}{yields}{pi}{sup +}{pi}{sup -})<1.7x10{sup -6}.
We search for excited and exotic muon states {mu}* using an integrated luminosity of 371 pb{sup -1} of pp collision data at {radical}(s)=1.96 TeV. We search for associated production of {mu}{mu}* ...followed by the decay {mu}*{yields}{mu}{gamma}. We compare the data to model predictions as a function of the mass of the excited muon M{sub {mu}}{sub *}, the compositeness energy scale {lambda}, and the gauge coupling factor f. No signal above the standard model expectation is observed. We exclude 107<M{sub {mu}}{sub *}<853 GeV/c{sup 2} for {lambda}=M{sub {mu}}{sub *} in the contact interaction model, and 100<M{sub {mu}}{sub *}<410 GeV/c{sup 2} for f/{lambda}=10{sup -2} GeV{sup -1} in the gauge-mediated model, both at the 95% confidence level.
We report on a search for B{sub s}{sup 0}{yields}{mu}{sup +}{mu}{sup -} and B{sub d}{sup 0}{yields}{mu}{sup +}{mu}{sup -} decays in pp collisions at {radical}(s)=1.96 TeV using 364 pb{sup -1} of data ...collected by the CDF II detector at the Fermilab Tevatron Collider. After applying all selection requirements, we observe no candidates inside the B{sub s}{sup 0} or B{sub d}{sup 0} mass windows. The resulting upper limits on the branching fractions are B(B{sub s}{sup 0}{yields}{mu}{sup +}{mu}{sup -})<1.5x10{sup -7} and B(B{sub d}{sup 0}{yields}{mu}{sup +}{mu}{sup -})<3.9x10{sup -8} at 90% confidence level.
We present the results of a search for new physics in the jets plus missing transverse energy data sample collected from 368 pb{sup -1} of pp collisions at {radical}(s)=1.96 TeV recorded by the ...Collider Detector at Fermilab. We compare the number of events observed in the data with a data-based estimate of the standard model backgrounds contributing to this signature. We observe no significant excess of events, and we interpret this null result in terms of lower limits on the fundamental Planck scale for a large extra dimensions scenario.
We present the results of a search for standard model Higgs boson production with decay to WW*, identified through the leptonic final states e{sup +}e{sup -}{nu}{nu},e{sup {+-}}{mu}{sup {+-}}{nu}{nu} ...and {mu}{sup +}{mu}{sup -}{nu}{nu}. This search uses 360 pb{sup -1} of data collected from pp collisions at {radical}(s)=1.96 TeV by the upgraded Collider Detector at Fermilab (CDF II). We observe no signal excess and set 95% confidence level upper limits on the production cross section times branching ratio for the Higgs boson to WW* or any new scalar particle with similar decay products. These upper limits range from 5.5 to 3.2 pb for Higgs boson masses between 120 and 200 GeV/c{sup 2}.
We present a measurement of the top quark pair production cross section in pp collisions at {radical}(s)=1.96 TeV using 318 pb{sup -1} of data collected with the Collider Detector at Fermilab. We ...select tt decays into the final states e{nu}+jets and {mu}{nu}+jets, in which at least one b quark from the t-quark decays is identified using a secondary vertex-finding algorithm. Assuming a top quark mass of 178 GeV/c{sup 2}, we measure a cross section of 8.7{+-}0.9(stat){sub -0.9}{sup +1.1}(syst) pb. We also report the first observation of tt with significance greater than 5{sigma} in the subsample in which both b quarks are identified, corresponding to a cross section of 10.1{sub -1.4}{sup +1.6}(stat){sub -1.3}{sup +2.0}(syst) pb.
We present the first precise measurement of the B{sub s}{sup 0}-B{sub s}{sup 0} oscillation frequency {delta}m{sub s}. We use 1 fb{sup -1} of data from pp collisions at {radical}(s)=1.96 TeV ...collected with the CDF II detector at the Fermilab Tevatron. The sample contains signals of 3600 fully reconstructed hadronic B{sub s} decays and 37 000 partially reconstructed semileptonic B{sub s} decays. We measure the probability as a function of proper decay time that the B{sub s} decays with the same, or opposite, flavor as the flavor at production, and we find a signal consistent with B{sub s}{sup 0}-B{sub s}{sup 0} oscillations. The probability that random fluctuations could produce a comparable signal is 0.2%. Under the hypothesis that the signal is due to B{sub s}{sup 0}-B{sub s}{sup 0} oscillations, we measure {delta}m{sub s}=17.31{sub -0.18}{sup +0.33}(stat){+-}0.07(syst) ps{sup -1} and determine vertical bar V{sub td}/V{sub ts} vertical bar =0.208{sub -0.002}{sup +0.001}(expt){sub -0.006}{sup +0.008}(theor)
40 patients with acute myocardial infarction had serial determinations of CK, CKMB and an addition of serum myoglobin (SMb) by radioimmunoassay. In 10 patients with normal values on admission SMb ...rose earlier than CK and CKMB. In another 20 patients SMb was pathologically increased while CK and CKMB were normal and in 10 patients all parameters were elevated on admission. In all 40 patients SMb was significantly elevated in between 10 hrs after beginning of angina, and peak myoglobin occurred 10 hrs before CK and CKMB. In 10 patients peak SMb correlated with infarct size as determined by angiocardiography in the chronic stage (r = 0.863; p less than 0.01). Peak SMb also correlated with infarct size as estimated by CK release (r = 0.73; p less than 0.001). Thus determination of SMb is a sensitive method in diagnosing early myocardial infarction, and peak serum myoglobin allows early prediction of infarct size.
Terbium-149 (T
= 4.1 h, E
= 3.98 MeV (16.7%), 28 µm range in tissue) is a radionuclide with potential for targeted alpha therapy. Due to the negligible emission of α-emitting daughter nuclides, ...toxicity to healthy tissue may be reduced in comparison with other α-particle emitters. In this study, terbium-149 was produced via 1.4 GeV proton irradiation of a tantalum target at the CERN-ISOLDE facility. The spallation products were mass separated and implanted on zinc-coated foils and, later, radiochemically processed. Terbium-149 was separated from the co-produced isobaric radioisotopes and the zinc coating from the implantation foil, using cation-exchange and extraction chromatographic techniques, respectively. At the end of separation, up to 260 MBq terbium-149 were obtained with > 99% radionuclidic purity. Radiolabeling experiments were performed with DOTATATE, achieving 50 MBq/nmol apparent molar activity with radiochemical purity > 99%. The chemical purity was determined by inductively coupled plasma-mass spectrometry measurements, which showed lead, copper, iron and zinc only at ppb level. The radiolabeling of the somatostatin analogue DOTATATE with
TbTbCl
and the subsequent in vivo PET/CT scans conducted in xenografted mice, showing good tumor uptake, further demonstrated product quality and its ability to be used in a preclinical setting.
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