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5 results on '"H.A. Rubin"'

1. Multidimensional resonance analysis of Λc+→pK−π+

Author

E.M. Aitala, S. Amato, J.C. Anjos, J.A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S.B. Bracker, P.R. Burchat, R.A. Burnstein, T. Carter, H.S. Carvalho, N.K. Copty, L.M. Cremaldi, C. Darling, K. Denisenko, S. Devmal, A. Fernandez, G.F. Fox, P. Gagnon, C. Gobel, K. Gounder, A.M. Halling, G. Herrera, G. Hurvits, C. James, P.A. Kasper, S. Kwan, D.C. Langs, J. Leslie, B. Lundberg, J. Magnin, S. MayTal-Beck, B. Meadows, J.R.T. de Mello Neto, D. Mihalcea, R.H. Milburn, J.M. de Miranda, A. Napier, A. Nguyen, A.B. d'Oliveira, K. O'Shaughnessy, K.C. Peng, L.P. Perera, M.V. Purohit, B. Quinn, S. Radeztsky, A. Rafatian, N.W. Reay, J.J. Reidy, A.C. dos Reis, H.A. Rubin, D.A. Sanders, A.K.S. Santha, A.F.S. Santoro, A.J. Schwartz, M. Sheaff, R.A. Sidwell, A.J. Slaughter, M.D. Sokoloff, J. Solano, N.R. Stanton, R.J. Stefanski, K. Stenson, D.J. Summers, S. Takach, K. Thorne, A.K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, S.M. Yang, D. Yi, S. Yoshida, R. Zaliznyak, and C. Zhang

Subjects
Baryon, Physics, Nuclear and High Energy Physics, Particle physics, Amplitude, Resonance analysis, Pi, Resonance, Lambda, Bar (unit)
Abstract

We present the results of a five-dimensional resonant amplitude analysis of the $\Lambda_c^+{\to}pK^{-}\pi^{+}$ system based on $946\pm 38$ reconstructed decays. These data were produced in 500 GeV/$c$ $\pi^-$-N interactions by Fermilab experiment E791. We report measurements of the amplitudes for $\Lambda_c^+$ decay into nonresonant $pK^-\pi^+$ and to $p\bar{K}^{*0}(890)$, $\Delta^{++}(1232)K^-$, and $\Lambda(1520)\pi^+$ and we comment on other possible resonant enhancements. This is the first complete amplitude analysis of the $\Lambda_c^{+}{\to}pK^{-}\pi^{+}$ system. We find that $(54.8\pm5.5\pm3.5)$% of the decays are nonresonant, $(19.5\pm2.6\pm1.8)$% of the decays are via the $\bar{K}^{*0}$ resonance, $(18.0\pm2.9\pm2.9)$% of the decays are via the $\Delta^{++}$ resonance, and $(7.7\pm1.8\pm1.1)$% of the decays are via the $\Lambda(1520)$ resonance. We find evidence for an increasingly negative polarization of the $\Lambda_c^+$ baryons as a function of $p_T^2$, in agreement with a recent model\cite{dha} and with a related measurement\cite{jez}.

Published
2000

2. Measurement of the form-factor ratios for D+s→φℓ+νℓ

Author

E.M. Aitala, S. Amato, J.C. Anjos, J.A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S.B. Bracker, P.R. Burchat, R.A. Burnstein, T. Carter, H.S. Carvalho, N.K. Copty, L.M. Cremaldi, C. Darling, K. Denisenko, A. Fernandez, G.F. Fox, P. Gagnon, C. Gobel, K. Gounder, A.M. Halling, G. Herrera, G. Hurvits, C. James, P.A. Kasper, S. Kwan, D.C. Langs, J. Leslie, B. Lundberg, S. MayTal-Beck, B. Meadows, J.R.T. de Mello Neto, D. Mihalcea, R.H. Milburn, J.M. de Miranda, A. Napier, A. Nguyen, A.B. d'Oliveira, K. O'Shaughnessy, K.C. Peng, L.P. Perera, M.V. Purohit, B. Quinn, S. Radeztsky, A. Rafatian, N.W. Reay, J.J. Reidy, A.C. dos Reis, H.A. Rubin, D.A. Sanders, A.K.S. Santha, A.F.S. Santoro, A.J. Schwartz, M. Sheaff, R.A. Sidwell, A.J. Slaughter, M.D. Sokoloff, J. Solano, N.R. Stanton, R.J. Stefanski, K. Stenson, D.J. Summers, S. Takach, K. Thorne, A.K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, S.M. Yang, D. Yi, S. Yoshida, R. Zaliznyak, and C. Zhang

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Electron channel, Form factor (quantum field theory), Lepton
Abstract

We have measured the form factor ratios r_V = V(0)/A_1(0) and r_2 = A_2(0)/A_1(0) for the decay D_s^+ -> phi ell^+ nu_ell, phi -> K^+ K^-, using data from charm hadroproduction experiment E791 at Fermilab. Results are based on 144 signal and 22 background events in the electron channel and 127 signal and 34 background events in the muon channel. We combine the measurements from both lepton channels to obtain r_V = 2.27 +- 0.35 +- 0.22 and r_2 = 1.57 +- 0.25 +- 0.19.

Published
1999

3. Measurement of the Ds lifetime

Author

E.M. Aitala, S. Amato, J.C. Anjos, J.A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S.B. Bracker, P.R. Burchat, R.A. Burnstein, T. Carter, H.S. Carvalho, N.K. Copty, L.M. Cremaldi, C. Darling, K. Denisenko, A. Fernandez, G.F. Fox, P. Gagnon, C. Gobel, K. Gounder, A.M. Halling, G. Herrera, G. Hurvits, C. James, P.A. Kasper, S. Kwan, D.C. Langs, J. Leslie, B. Lundberg, S. MayTal-Beck, B. Meadows, J.R.T. de Mello Neto, D. Mihalcea, R.H. Milburn, J.M. de Miranda, A. Napier, A. Nguyen, A.B. d'Oliveira, K. O'Shaughnessy, K.C. Peng, L.P. Perera, M.V. Purohit, B. Quinn, S. Radeztsky, A. Rafatian, N.W. Reay, J.J. Reidy, A.C. dos Reis, H.A. Rubin, D.A. Sanders, A.K.S. Santha, A.F.S. Santoro, A.J. Schwartz, M. Sheaff, R.A. Sidwell, A.J. Slaughter, M.D. Sokoloff, J. Solano, N.R. Stanton, R.J. Stefanski, K. Stenson, D.J. Summers, S. Takach, K. Thorne, A.K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, S.M. Yang, D. Yi, S. Yoshida, R. Zaliznyak, and C. Zhang

Subjects
Physics, High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, Particle physics, Meson, Maximum likelihood, FOS: Physical sciences, Charm (quantum number), Fermilab, Measure (mathematics), Standard deviation, High Energy Physics - Experiment
Abstract

We report the results of a precise measurement of the Ds meson lifetime based on 1662 +/- 56 fully reconstructed Ds -> phi pi decays, from the charm hadroproduction experiment E791 at Fermilab. Using an unbinned maximum likelihood fit, we measure the Ds lifetime to be 0.518 +/- 0.014 +/- 0.007 ps. The ratio of the measured Ds lifetime to the world average D0 lifetime is 1.25 +/- 0.04. This result differs from unity by six standard deviations, indicating significantly different lifetimes for the Ds and the D0., 12 pages, 3 figures, 2 table. LaTeX

Published
1999

4. Observation of D - π production correlations in 500 GeV π− - N interactions

Author

E.M. Aitala, S. Amato, J.C. Anjos, J.A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S.B. Bracker, P.R. Burchat, R.A. Burnstein, T. Carter, H.S. Carvalho, N.K. Copty, I. Costa, L.M. Cremaldi, C. Darling, K. Denisenko, A. Fernandez, P. Gagnon, S. Gerzon, K. Gounder, A.M. Halling, G. Herrera, G. Hurvits, C. James, P.A. Kasper, S. Kwan, D.C. Langs, J. Leslie, B. Lundberg, S. MayTal-Beck, B.T. Meadows, J.R.T. de Mello Neto, R.H. Milburn, J.M. de Miranda, A. Napier, A. Nguyen, A.B. d'Oliveira, K. O'Shaughnessy, K.C. Peng, L.P. Perera, M.V. Purohit, B. Quinn, S. Radeztsky, A. Rafatian, N.W. Reay, J.J. Reidy, A.C. dos Reis, H.A. Rubin, A.K.S. Santha, A.F.S. Santoro, A.J. Schwartz, M. Sheaff, R.A. Sidwell, A.J. Slaughter, M.D. Sokoloff, N.R. Stanton, K. Stenson, D.J. Summers, S. Takach, K. Thorne, A.K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, D. Yi, S. Yoshida, R. Zaliznyak, and C. Zhang

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, FOS: Physical sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), symbols.namesake, Pion, Fragmentation (mass spectrometry), Phase space, Pi, symbols, Feynman diagram, High Energy Physics::Experiment, Fermilab, Nuclear Experiment
Abstract

We study the charge correlations between charm mesons produced in 500 GeV pi- - N interactions and the charged pions produced closest to them in phase space. With 110,000 fully reconstructed D mesons from experiment E791 at Fermilab, the correlations are studied as functions of the Dpi - D mass difference and of Feynman x. We observe significant correlations which appear to originate from a combination of sources including fragmentation dynamics, resonant decays, and charge of the beam., Comment: 12 pages and 2 figures

Published
1997

5. Measurement of the branching ratio

Author

E.M. Aitala, S. Amato, J.C. Anjos, J.A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S.B. Bracker, P.R. Burchat, R.A. Burnstein, T. Carter, H.S. Carvalho, N.K. Copty, L.M. Cremaldi, C. Darling, K. Denisenko, A. Fernandez, P. Gagnon, K. Gounder, A.M. Halling, G. Herrera, G. Hurvits, C. James, P.A. Kasper, S. Kwan, D.C. Langs, J. Leslie, B. Lundberg, S. MayTal-Beck, B. Meadows, J.R.T. de Mello Neto, R.H. Milburn, J.M. de Miranda, A. Napier, A. Nguyen, A.B. d'Oliveira, K. O'Shaughnessy, K.C. Peng, L.P. Perera, M.V. Purohit, B. Quinn, S. Radeztsky, A. Rafatian, N.W. Reay, J.J. Reidy, A.C. dos Reis, H.A. Rubin, A.K.S. Santha, A.F.S. Santoro, A.J. Schwartz, M. Sheaff, R.A. Sidwell, A.J. Slaughter, M.D. Sokoloff, N.R. Stanton, K. Stenson, D.J. Summers, S. Takach, K. Thorne, A.K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, D. Yi, S. Yoshida, R. Zaliznyak, and C. Zhang

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, Charm (quantum number)
Abstract

We report a measurement of the branching ratio B(D+-->rho^0 l nu)/ B(D+-->K*0 l nu) from the Fermilab charm hadroproduction experiment E791. Based on signals of 49+-17 events in the D+--> rho^0 e nu mode and 54+-18 events in the D+--> rho^0 mu nu mode, we measure B(D+-->rho^0 e nu)/B(D+-->K*0 e nu) = 0.045+-0.014+-0.009, and B(D+-->rho^0 mu nu)/B(D+-->K*0 mu nu) = 0.051+-0.015+-0.009. Combining the results from both the electronic and muonic modes, we obtain B(D+-->rho^0 l nu)/B(D+-->K*0 l nu) = 0.047+-0.013. This result is compared to theoretical predictions.

Published
1997

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