We present new limits on resonant tb̅ production in pp̅ collisions at√ s= 1.96 TeV, using 1.9 fb ... more We present new limits on resonant tb̅ production in pp̅ collisions at√ s= 1.96 TeV, using 1.9 fb [superscript-1] of data recorded with the CDF II detector at the Fermilab Tevatron. We reconstruct a candidate tb̅ mass in events with a lepton, neutrino candidate, and two or three jets, and search for anomalous tb̅ production as modeled by W′→ tb̅. We set a new limit on a right-handed W′ with standard model-like coupling, excluding any mass below 800 GeV/c [superscript 2] at 95% CL The cross section for any narrow, resonant tb̅ ...
T. Aaltonen, J. Adelman, B. A´ lvarez Gonzalez, S. Amerio, D. Amidei, A. Anastassov, A. Annovi, J... more T. Aaltonen, J. Adelman, B. A´ lvarez Gonzalez, S. Amerio, D. Amidei, A. Anastassov, A. Annovi, J. Antos, G. Apollinari, A. Apresyan, T. Arisawa, A. Artikov, J. Asaadi, W. Ashmanskas, A. Attal, A. Aurisano, F. Azfar, W. Badgett, A. Barbaro-Galtieri, VE Barnes, BA Barnett, P. Barria, P. Bartos, G. Bauer, P.-H. Beauchemin, F. Bedeschi, D. Beecher, S. Behari, G. Bellettini, J. Bellinger, D. Benjamin, A. Beretvas, A. Bhatti, M. Binkley, D. Bisello, I. Bizjak, RE Blair, C. Blocker, B. Blumenfeld, A. Bocci, A. Bodek, V. Boisvert, D. Bortoletto, J. ...
We present a measurement of the $\ttbar$ differential cross section with respect to the $\ttbar$ ... more We present a measurement of the $\ttbar$ differential cross section with respect to the $\ttbar$ invariant mass, dSigma/dMttbar, in $\ppbar$ collisions at $\sqrt{s}=1.96$ TeV using an integrated luminosity of $2.7\invfb$ collected by the CDF II experiment. The $\ttbar$ invariant mass spectrum is sensitive to a variety of exotic particles decaying into $\ttbar$ pairs. The result is consistent with the standard model expectation, as modeled by \texttt{PYTHIA} with \texttt{CTEQ5L} parton distribution functions.
We report the first observation of two Cabibbo-suppressed decay modes of the B0_s meson. Using a ... more We report the first observation of two Cabibbo-suppressed decay modes of the B0_s meson. Using a sample of p-pbar collisions at sqrt{s}=1.96 TeV corresponding to 5.9 fb-1 of integrated luminosity collected with the CDFII detector at the Fermilab Tevatron, we search for new B0_s decay modes in a sample of events containing J/psi to mu+ mu- decays. We reconstruct a B0_s to J/psi K*(892)0 signal with K^*(892)0 to K+ pi-, observing a yield of 151 +/- 25 events with a statistical significance of 8.0 sigma. We also reconstruct a B0_s to J/psi K0_S signal with K0_S to pi+ pi-, observing a yield of 64 +/- 14 events with a statistical significance of 7.2 sigma. From these yields, we extract the branching ratios B(B0_s -> J/psi K*(892)0)= (8.3 +/- 3.8) x 10{-5} and B(B0_s -> J/psi K0)= (3.5 +/- 0.8) x 10{-5}, where statistical, systematic and fragmentation fraction uncertainties are included in the combined uncertainty.
We report a measurement of the ratio of the top-antitop to Z/gamma* production cross sections in ... more We report a measurement of the ratio of the top-antitop to Z/gamma* production cross sections in sqrt(s) = 1.96 TeV proton-antiproton collisions using data corresponding to an integrated luminosity of up to 4.6 fb-1, collected by the CDF II detector. The top-antitop cross section ratio is measured using two complementary methods, a b-jet tagging measurement and a topological approach. By multiplying the ratios by the well-known theoretical Z/gamma*->ll cross section, the extracted top-antitop cross sections are effectively insensitive to the uncertainty on luminosity. A best linear unbiased estimate is used to combine both measurements with the result sigma_(top-antitop) = 7.70 +/- 0.52 pb, for a top-quark mass of 172.5 GeV/c^2.
ABSTRACT We present a measurement of the CP-violating parameter βsJ/ψϕ using approximately 6500 B... more ABSTRACT We present a measurement of the CP-violating parameter βsJ/ψϕ using approximately 6500 Bs0→J/ψϕ decays reconstructed with the CDF II detector in a sample of pp̅ collisions at √s=1.96 TeV corresponding to 5.2 fb-1 integrated luminosity produced by the Tevatron collider at Fermilab. We find the CP-violating phase to be within the range βsJ/ψϕ∈[0.02,0.52]∪[1.08,1.55] at 68% confidence level where the coverage property of the quoted interval is guaranteed using a frequentist statistical analysis. This result is in agreement with the standard model expectation at the level of about one Gaussian standard deviation. We consider the inclusion of a potential S-wave contribution to the Bs0→J/ψK+K- final state which is found to be negligible over the mass interval 1.009<m(K+K-)<1.028 GeV/c2. Assuming the standard model prediction for the CP-violating phase βsJ/ψϕ, we find the Bs0 decay width difference to be ΔΓs=0.075±0.035(stat)±0.006(syst) ps-1. We also present the most precise measurements of the Bs0 mean lifetime τ(Bs0)=1.529±0.025(stat)±0.012(syst) ps, the polarization fractions |A0(0)|2=0.524±0.013(stat)±0.015(syst) and |A∥(0)|2=0.231±0.014(stat)±0.015(syst), as well as the strong phase δ⊥=2.95±0.64(stat)±0.07(syst) rad. In addition, we report an alternative Bayesian analysis that gives results consistent with the frequentist approach.
... 52 JR Smith,7 FD Snider,15 A. Soha,15 V. Sorin,4 H. Song,43 P. Squillaciotihh,42 M.Stancari,1... more ... 52 JR Smith,7 FD Snider,15 A. Soha,15 V. Sorin,4 H. Song,43 P. Squillaciotihh,42 M.Stancari,15 R. St ... Institute of Technology, Cambridge, Massachusetts 02139, USA 31Institute of Particle Physics: McGill University, Montréal, Québec, Canada H3A 2T8; Simon Fraser University ...
We present new limits on resonant tb̅ production in pp̅ collisions at√ s= 1.96 TeV, using 1.9 fb ... more We present new limits on resonant tb̅ production in pp̅ collisions at√ s= 1.96 TeV, using 1.9 fb [superscript-1] of data recorded with the CDF II detector at the Fermilab Tevatron. We reconstruct a candidate tb̅ mass in events with a lepton, neutrino candidate, and two or three jets, and search for anomalous tb̅ production as modeled by W′→ tb̅. We set a new limit on a right-handed W′ with standard model-like coupling, excluding any mass below 800 GeV/c [superscript 2] at 95% CL The cross section for any narrow, resonant tb̅ ...
T. Aaltonen, J. Adelman, B. A´ lvarez Gonzalez, S. Amerio, D. Amidei, A. Anastassov, A. Annovi, J... more T. Aaltonen, J. Adelman, B. A´ lvarez Gonzalez, S. Amerio, D. Amidei, A. Anastassov, A. Annovi, J. Antos, G. Apollinari, A. Apresyan, T. Arisawa, A. Artikov, J. Asaadi, W. Ashmanskas, A. Attal, A. Aurisano, F. Azfar, W. Badgett, A. Barbaro-Galtieri, VE Barnes, BA Barnett, P. Barria, P. Bartos, G. Bauer, P.-H. Beauchemin, F. Bedeschi, D. Beecher, S. Behari, G. Bellettini, J. Bellinger, D. Benjamin, A. Beretvas, A. Bhatti, M. Binkley, D. Bisello, I. Bizjak, RE Blair, C. Blocker, B. Blumenfeld, A. Bocci, A. Bodek, V. Boisvert, D. Bortoletto, J. ...
We present a measurement of the $\ttbar$ differential cross section with respect to the $\ttbar$ ... more We present a measurement of the $\ttbar$ differential cross section with respect to the $\ttbar$ invariant mass, dSigma/dMttbar, in $\ppbar$ collisions at $\sqrt{s}=1.96$ TeV using an integrated luminosity of $2.7\invfb$ collected by the CDF II experiment. The $\ttbar$ invariant mass spectrum is sensitive to a variety of exotic particles decaying into $\ttbar$ pairs. The result is consistent with the standard model expectation, as modeled by \texttt{PYTHIA} with \texttt{CTEQ5L} parton distribution functions.
We report the first observation of two Cabibbo-suppressed decay modes of the B0_s meson. Using a ... more We report the first observation of two Cabibbo-suppressed decay modes of the B0_s meson. Using a sample of p-pbar collisions at sqrt{s}=1.96 TeV corresponding to 5.9 fb-1 of integrated luminosity collected with the CDFII detector at the Fermilab Tevatron, we search for new B0_s decay modes in a sample of events containing J/psi to mu+ mu- decays. We reconstruct a B0_s to J/psi K*(892)0 signal with K^*(892)0 to K+ pi-, observing a yield of 151 +/- 25 events with a statistical significance of 8.0 sigma. We also reconstruct a B0_s to J/psi K0_S signal with K0_S to pi+ pi-, observing a yield of 64 +/- 14 events with a statistical significance of 7.2 sigma. From these yields, we extract the branching ratios B(B0_s -> J/psi K*(892)0)= (8.3 +/- 3.8) x 10{-5} and B(B0_s -> J/psi K0)= (3.5 +/- 0.8) x 10{-5}, where statistical, systematic and fragmentation fraction uncertainties are included in the combined uncertainty.
We report a measurement of the ratio of the top-antitop to Z/gamma* production cross sections in ... more We report a measurement of the ratio of the top-antitop to Z/gamma* production cross sections in sqrt(s) = 1.96 TeV proton-antiproton collisions using data corresponding to an integrated luminosity of up to 4.6 fb-1, collected by the CDF II detector. The top-antitop cross section ratio is measured using two complementary methods, a b-jet tagging measurement and a topological approach. By multiplying the ratios by the well-known theoretical Z/gamma*->ll cross section, the extracted top-antitop cross sections are effectively insensitive to the uncertainty on luminosity. A best linear unbiased estimate is used to combine both measurements with the result sigma_(top-antitop) = 7.70 +/- 0.52 pb, for a top-quark mass of 172.5 GeV/c^2.
ABSTRACT We present a measurement of the CP-violating parameter βsJ/ψϕ using approximately 6500 B... more ABSTRACT We present a measurement of the CP-violating parameter βsJ/ψϕ using approximately 6500 Bs0→J/ψϕ decays reconstructed with the CDF II detector in a sample of pp̅ collisions at √s=1.96 TeV corresponding to 5.2 fb-1 integrated luminosity produced by the Tevatron collider at Fermilab. We find the CP-violating phase to be within the range βsJ/ψϕ∈[0.02,0.52]∪[1.08,1.55] at 68% confidence level where the coverage property of the quoted interval is guaranteed using a frequentist statistical analysis. This result is in agreement with the standard model expectation at the level of about one Gaussian standard deviation. We consider the inclusion of a potential S-wave contribution to the Bs0→J/ψK+K- final state which is found to be negligible over the mass interval 1.009<m(K+K-)<1.028 GeV/c2. Assuming the standard model prediction for the CP-violating phase βsJ/ψϕ, we find the Bs0 decay width difference to be ΔΓs=0.075±0.035(stat)±0.006(syst) ps-1. We also present the most precise measurements of the Bs0 mean lifetime τ(Bs0)=1.529±0.025(stat)±0.012(syst) ps, the polarization fractions |A0(0)|2=0.524±0.013(stat)±0.015(syst) and |A∥(0)|2=0.231±0.014(stat)±0.015(syst), as well as the strong phase δ⊥=2.95±0.64(stat)±0.07(syst) rad. In addition, we report an alternative Bayesian analysis that gives results consistent with the frequentist approach.
... 52 JR Smith,7 FD Snider,15 A. Soha,15 V. Sorin,4 H. Song,43 P. Squillaciotihh,42 M.Stancari,1... more ... 52 JR Smith,7 FD Snider,15 A. Soha,15 V. Sorin,4 H. Song,43 P. Squillaciotihh,42 M.Stancari,15 R. St ... Institute of Technology, Cambridge, Massachusetts 02139, USA 31Institute of Particle Physics: McGill University, Montréal, Québec, Canada H3A 2T8; Simon Fraser University ...
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