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18 results on '"K. O'Shaughnessy"'

1. Asymmetries in the production of Λc+ and Λc− baryons in 500 GeV/c π− nucleon interactions

Author

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

Subjects
Physics, Nuclear and High Energy Physics, media_common.quotation_subject, Lambda, Asymmetry, Baryon, Nuclear physics, symbols.namesake, Pi, symbols, Feynman diagram, Production (computer science), Fermilab, Nucleon, media_common
Abstract

We present a measurement of asymmetries in the production of Λ c + and Λ c − baryons in 500 GeV/ c π − -nucleon interactions from the E791 experiment at Fermilab. The asymmetries were measured as functions of Feynman x ( x F ) and transverse momentum squared ( p T 2 ) using a sample of 1 819±62 Λ c 's observed in the decay channel Λ c + → pK − π + . We observe more Λ c + than Λ c − baryons, with an asymmetry of (12.7±3.4±1.3)% independent of x F and p T 2 in our kinematical range (−0.1⩽ x F ⩽0.6 and 0.0⩽ p T 2 ⩽8.0 (GeV/ c ) 2 ). This Λ c asymmetry measurement is the first with data in both the positive and negative x F regions.

Published
2000
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2. Asymmetries in the production of Λ0, Ξ−, and hyperons in 500 GeV/c π−–nucleon interactions

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, media_common.quotation_subject, Astrophysics::Cosmology and Extragalactic Astrophysics, Asymmetry, Nuclear physics, Baryon, symbols.namesake, Transverse momentum, symbols, Feynman diagram, High Energy Physics::Experiment, Fermilab, Nuclear Experiment, Nucleon, media_common
Abstract

We present a measurement of asymmetries in the production of Λc+ and Λc− baryons in 500 GeV/c π−-nucleon interactions from the E791 experiment at Fermilab. The asymmetries were measured as functions of Feynman x (xF) and transverse momentum squared (pT2) using a sample of 1 819±62 Λc's observed in the decay channel Λc+→pK−π+. We observe more Λc+ than Λc− baryons, with an asymmetry of (12.7±3.4±1.3)% independent of xF and pT2 in our kinematical range (−0.1⩽xF⩽0.6 and 0.0⩽pT2⩽8.0 (GeV/c)2). This Λc asymmetry measurement is the first with data in both the positive and negative xF regions.

Published
2000
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3. Search for the pentaquark via the decay

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Cross section (physics), Particle physics, Branching fraction, Fermilab, Beam (structure), Pentaquark
Abstract

We have searched for evidence of the production and decay of a neutral bound-state pentaquark, one of a predicted doublet of states: P 0 c s =| c suud〉 and P − c s =| c sddu〉 . Specifically, we have searched for the decay P 0 c s →K ∗0 K − p in data from Fermilab experiment E791, in which a 500 GeV/c π− beam interacted with nuclear targets. We find mass-dependent upper limits at the 90% confidence level for the ratio of cross section times branching fraction of this decay relative to that for the decay D s − →K ∗0 K − . The upper limits vary between 0.016 and 0.036 for M(P 0 c s ) between 2.75 and 2.91 GeV/c2, assuming a pentaquark lifetime of 0.4 ps.

Published
1999
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4. 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
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5. Branching fractions for D0→K+K− and D0→π+π−, and a search for CP violation in D0 decays

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, media_common.quotation_subject, CP violation, Fermilab, Charm (quantum number), Branching (polymer chemistry), Asymmetry, High Energy Physics - Experiment, media_common
Abstract

Using the large hadroproduced charm sample collected in experiment E791 at Fermilab, we have measured ratios of branching fractions for the two-body singly-Cabibbo-suppressed charged decays of the D0: (D0 -> KK)/(D0 -> Kpi) = 0.109 +- 0.003 +- 0.003, (D0 -> pipi)/(D0 -> Kpi) = 0.040 +- 0.002 +- 0.003, and (D0 -> KK)/(D0 -> pipi) = 2.75 +- 0.15 +- 0.16. We have looked for differences in the decay rates of D0 and D0bar to the CP eigenstates K+K- and pi+pi-, and have measured the CP asymmetry parameters A_CP(K+K-) = -0.010 +- 0.049 +- 0.012 and A_CP(pi+pi-) = -0.049 +- 0.078 +- 0.030, both consistent with zero., Comment: 10 Postscript pages, including 2 figures. Submitted to Phys. Lett. B

Published
1998
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6. Study of the decay D0→K−K+π−π+

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Amplitude, Branching fraction, Analytical chemistry, Fermilab, Measure (mathematics)
Abstract

Using data from Fermilab fixed-target experiment E791, we measure the branching ratio for D 0 → K − K + π − π + and its resonant components. We find Γ(D 0 →K − K + π − π + ) Γ(D 0 →K − π + π − π + ) =(3.13±0.37±0.36) %. A coherent amplitude analysis is used to estimate the resonant components. We measure the ratios Γ(D 0 →f) Γ(D 0 →K − π + π − π + ) to be (2.0±0.9±0.8)% for f = φρ 0 , (0.9±0.4±0.5)% for f = φπ + π − , f=K ∗0 (892) K ∗0 (892) , and f= K ∗0 (892)K + π − or K ∗0 (892)K − π + .

Published
1998
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7. Asymmetries between the production of D− and D+ mesons from 500 GeV/c π− nucleon interaction as functions of x and p2

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Meson, High Energy Physics::Lattice, media_common.quotation_subject, Nuclear Theory, High Energy Physics::Phenomenology, Asymmetry, Charm quark, Nuclear physics, High Energy Physics::Experiment, Fermilab, Nuclear Experiment, Nucleon, media_common
Abstract

We present measurements of the production of Ds− mesons relative to Ds+ mesons as functions of xF and of pt2 for a sample of 2445 Ds decays to φπ. The Ds mesons were produced in Fermilab experiment E791 with 500 GeV/c π− mesons incident on one platinum and four carbon foil targets. The acceptance-corrected integrated asymmetry in the xF range −0.1 to 0.5 for Ds± mesons is 0.032 ± 0.022 ± 0.022, consistent with no net asymmetry. We compare the results as functions of xF and pt2 to predictions and to the large production asymmetry observed for D± mesons in the same experiment. These comparisons support the hypothesis that production asymmetries come from the fragmentation process and not from the charm quark production itself.

Published
1997
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8. The doubly Cabibbo-suppressed decay D+ → K+ π− π+

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Branching fraction, Analytical chemistry, Dalitz plot, Fermilab
Abstract

We report the observation of the doubly Cabibbo-suppressed decay D + → K + π − π + in data from Fermilab charm hadroproduction experiment E791. With a signal of 59 ± 13 events we measured the ratio of the branching fraction for this mode to that of the Cabibbo-favored decay D + → K − π + π + to be B (D + → K + π − π + ) / B ( D + → K − π + π + ) = (7.7 ± 1.7 ± 0.8) × 10 −3 . A Dalitz plot analysis was performed to search for resonant structures.

Published
1997
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9. 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
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10. Search forD0D¯0Mixing in Semileptonic Decay Modes

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, 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, 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, K. Sugano, 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 physics, Semileptonic decay, chemistry, Bar (music), High Energy Physics::Phenomenology, General Physics and Astronomy, chemistry.chemical_element, High Energy Physics::Experiment, Fermilab, Carbon, Mixing (physics)
Abstract

We report the result of a search for D0 - D0_bar mixing in the data from hadroproduction experiment E791 at Fermilab. We use the D* tag and semileptonic decay vertices of D0 to look for wrong-sign decays with mixing time dependence.

Published
1996
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11. Asymmetries between the production of D+ and D− mesons from 500 GeV/c π−-nucleus interactions as a function of xF and pt2

Author

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

Subjects
Physics, Quark, Nuclear and High Energy Physics, Particle physics, Meson, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, FOS: Physical sciences, Function (mathematics), High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Pi, High Energy Physics::Experiment, Production (computer science), Fermilab, Nuclear Experiment, Nucleon, Beam (structure)
Abstract

We present asymmetries between the production of D+ and D- mesons in Fermilab experiment E791 as a function of xF and pt**2. The data used here consist of 74,000 fully-reconstructed charmed mesons produced by a 500 GeV/c pi- beam on C and Pt foils. The measurements are compared to results of models which predict differences between the production of heavy-quark mesons that have a light quark in common with the beam (leading particles) and those that do not (non-leading particles). While the default models do not agree with our data, we can reach agreement with one of them, PYTHIA, by making a limited number of changes to parameters used.

Published
1996
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12. Publisher’s Note: Model-independent measurement ofS-waveK−π+systems usingD+→Kππdecays from Fermilab E791 [Phys. Rev. D 73, 032004 (2006)]

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Particle decay, S-wave, Pi, Fermilab
Published
2006
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13. BEAM TESTS OF THE ZEUS BARREL CALORIMETER

Author

ZEUS Collaboration M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, S. Repond, R. Stanek, R. L. Talaga, J. Thron Argonne National Laboratory, Argonne, IL, USA 47 F. Arzarello, R. Ayad l, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini 2, M. Chiarini, L. Cifarelli, F. Cindolo, F. Ciralli, A. Contin, S. D'Auria, C. Del Papa, F. Frasconi, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, Q. Lin, B. Lisowski, G. Maccarrone, A. Margotti, T. Massam, R. Nania, C. Nemoz, F. Palmonari, G. Sartorelli, R. Timellini, Y. Zamora Garcia l, A. Zichichi University, INFN Bologna, Bologna, Italy 39 A. Bargende, J. Crittenden, K. Desch, B. Diekmann, T. Doeker, A. Frey, M. Geerts, G. Geitz, H. Hartmann, D. Haun, K. Heinloth, E. Hilger, H. P. Jakob, S. Kramarczyk, M. Kiickes 3, A. Mass, S. Mengel, J. Mollen, D. Monaldi4, H. Miisch 5, E. Paul, R. Schattevoy, J. L. Schneider, D. Schramm, R. Wedemeyer Physikalisches Institut der Universitiit Bonn, Bonn, Federal Republic of Germany 36 A. Cassidy, D. G. Cussans, N. Dyce, B. Foster, R. Gilmore, G. P. Heath, H. F. Heath, M. Lancaster, T. J. Llewellyn, J. Malos, C. J. S. Morgado, R. J. Tapper, S. S. Wilson, R. Yoshida H. H. Wills Physics Laboratory, University of Bristol, Bristol, UK 46 R. R. Rau Brookhaven National Laboratory, Upton, L. I., USA 47 M. Arneodo, M. Schioppa, G. Susinno Calabria University, Physics Department, INFN, Cosenza, Italy 39 A. Bernstein, A. Caldwell, I. Gialas, J. A. Parsons, S. Ritz, F. Sciulli 6, P. B. Straub, L. Wai, S. Yang Columbia University, Nevis Labs, Irvington on Hudson, USA 48 P. Borzemski, J. Chwastowski 7, A. Dwura~ny, A. Eskreys, Z. Jakubowski 8 B. Niziot, K. Piotrzkowski, M. Zachara, L. Zawiejski Institute of Nuclear Physics, Cracow, Poland 43 L. Adamczyk, B. Bednarek, K. Eskreys, K. Jelefi, D. Kisielewska, T. Kowalski, E. Rulikowska Zar~bska, L. Suszycki, J. Zaj0c Faculty of Physics, Nuclear T.e.c.h.n.i.q.u.e.s. Academy of Mining, Metallurgy, Cracow, Poland 43 T. Kgdzierski, A. Kotafiski, M. Przybyciefi Jagellonian University, Department of Physics, Poland 43 L. A. T. Bauerdick, U. Behrens, J. K. Bienlein, S. B6ttcher, C. Coldewey, A. Dannemann, G. Drews, P. Erhard 9, M. Flasifiski 10, I. Fleck, R. Gl~iser l. l, p. G6ttlicher, B. Gutjahr, T. Haas, L. Hagge, W. Hain, D. Hasell, H. Hultschig, G. Jahnen 12, p. Joos, M. Kasemann, R. Klanner, W. Koch, L. K6pke, U. K6tz, H. Kowalski, W. Kr6ger, J. Kriiger, J. Labs, A. Ladage, B. L6hr, M. L6we, D. Lfike, J. Mainusch, O. Manczak, M. Momayezi 13, J. S. T. Ng, S. Nickel, D. Notz, K. U. P6snecker 14, M. Rohde, J. Roldfin 15, E. Ros 7, U. Schneekloth, J. Schroeder, W. Schulz, F. Selonke, E. Stiliaris 15, E. Tscheslog 17, T. Tsurugai, W. Vogel 17, G. Wolf, C. Youngman Deutsches Elektronen Synchrotron DESE Hamburg, Federal Republic of Germany H. J. Grabosch, A. Leich, A. Meyer, C. Rethfeldt, S. Schlenstedt DESY Zeuthen, Institut fiir Hochenergiephysik, Zeuthen, Federal Republic of Germany G. Barbagli, A. Francescato, M. Nuti, P. Pelfer University, INFN, Florence, Italy 39 G. Anzivino, R. Casaccia, S. De Pasquale, S. Qian, L. Votano INFN, Laboratori Nazionali di Frascati, Frascati, Italy 39 A. Bamberger, A. Freidhof, T. Poser, S. S61dner Rembold, G. Theisen, T. Trefzger Physikalisches Institut der Universitgit Freiburg, Freiburg, Federal Republic of Germany 36 N. H. Brook, P. J. Bussey, A. T. Doyle, J. R. Forbes, V. A. Jamieson, C. Raine, D. H. Saxon Department of Physics, Astronomy, University of Glasgow, Glasgow, UK 46 H. Brtickmann 18, G. Gloth, U. Holm, H. Kammerlocher, B. Krebs, T. Neumann, K. Wick Hamburg University, 1st Institute of Experimental Physics, Hamburg, Federal Republic of Germany 36 A. Fiirtjes, E. Lohrmann, J. Milewski 19, M. Nakahata 2°, N. Pavel, G. Poelz, W. Schott, J. Terron 15, F. Zetsche Hamburg U.n.i.v.e.r.s.i.t.y. Hnd Institute ofExperimental Physics, Federal Republic of Germany 36 T. C. Bacon, R. Beuselinck, I. Butterworth, E. Gallo, V. L. Harris, D. B. Miller, A. Prinias, J. K. Sedgbeer, A. Vorvolakos, A. Whitfield Imperial College London, High Energy Nuclear Physics Group, London, UK 46 T. Bienz, H. Kreutzmann, U. Mallik, E. McCliment, M. Roco, M. Z. Wang University of lowa, Physics, Astronomy Department, Iowa City, USA 47 P. Cloth, D. Filges Forschungszentrum Jiilich, lnstitut fiir Kernphysik, J.i.i.l.i.c.h. Federal Republic of Germany S. H. An, S. M. Hong, C. O. Kim, T. Y. Kim, S. W. Nam, S. K. Park, M. H. Suh, S. H. Yon Korea University, Seou[, Korea 4] R. Imlay, S. Kartik, H. J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla Louisiana State University, Department ~ Physics, Baton Rouge, USA 47 F. Barreiro 21, G. Cases, L. Herv~s 22, L. Labarga 22, j. del Peso, J. F. de Troc6niz 23 U.n.i.v.e.r. Aut6noma Madrid, Depto de Fisica Te6rlca, Madrid, Spain 45 F. Ikraiam, J. K. Mayer, G. R. Smith University of Manitoba, Winnipeg, Manitoba, Canada 34 F. Corriveau, D. J. Gilkinson, D. S. Hanna 6, j. Hartmann, L. W. Hung, J. N. Lira, R. Meijer Drees, J. W. Mitchell, P. M. Patel, L. E. Sinclair, D. G. Stairs, M. S.t. Laurent, R. Ullmann McGill University, Montreal, Quebec, Canada 34, 35 G. L. Bashindzhagyan, P. F. Ermolov, L. K. Gladilin, Y. A. Golubkov, V. A. Kuzmin, E. N. Kuznetsov, A. A. Savin, A. G. Voronin, N. P. Zotov Moscow State University, Institute of Nuclear Pysics, Moscow, Russia 44 S. Bentvelsen, M. Botje, A. Dake, J. Engelen, P. de Jong, M. de Kamps, P. Kooijman, A. Kruse, H. van der Lugt, V. O'Dell, A. Tenner, H. Tiecke, H. Uijterwaa124, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg N1KHEF Amsterdam, Amsterdam, Netherlands 42 B. Bylsma, L. S. Durkin, K. Honscheid, C. Li, T. Y. Ling, K. W. McLean, W. N. Murray, I. H. Park, T. A. Romanowski 25 R. Seidlein Ohio State University, Columbus, OH, USA 47 G. A. Blair, A. Byrne, R. J. Cashmore, A. M. Cooper Sarkar, R. C. E. Devenish, D. M. Gingrich 26, P. M. Hallam Baker 7 N. Harnew, T. Khatri, K. R. Long, P. Luffman, 1. McArthur, P. Morawitz, J. Nash, S. J. P. Smith 27, N. C. Roocroft, F. F. Wilson Department of Physics, University of Oxford, Oxford, UK 46 G. Abbiendi, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, F. Gasparini, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci Dipartimento di Fisica dell Universita, INFN, Padova, ltaly 39 J. M. Butterworth, J. Bulmahn, G. Feild, B. Y. Oh 28, j. Whitmore 29 Pennsylvania State University, University Park, USA 48 U. Contino, G. D'Agostini, M. Guida 30, M. Iori, G. Marini, M. Mattioli, A. Nigro Dipartimento di Fisica, Universiffz 'La Sapienza, INFN, Rome, Italy 39 J. C. Hart, N. A. McCubbin, K. Prytz, T. P. Shah, T. L. Short Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, UK 46 E. Barberis, N. Cartiglia, C. Heusch, B. Hubbard, J. Leslie, W. Lockman, K. O'Shaughnessy, H. F. Sadrozinski, A. Seiden, D. Zer Zion University of California, Santa Cruz, USA 47 E. Badura, J. Biltzinger, R. J. Seifert, A. H. Walenta, G. Zech Fachbereich Physik der Universitgit Gesamthochschule Siegen, Siegen, Federal Republic of Germany 36 S. Dagan 31, A. Levy School of Physics, Tel Aviv University, Tel Aviv, Israel 38 T. Hasegawa, M. Hazumi, T. Ishii, S. Kasai 32, M. Kuze, S. Mine, Y. Nagasawa, T. Nagira, M. Nakao, H. Okuno, I. Suzuki, K. Tokushuku, S. Yamada, Y. Yamazaki Institute for Nuclear Study, University of Tokyo, Tokyo, Japan 4° M. Chiba, R. Hamatsu, T. Hirose, S. Kitamura, S. Nagayama, Y. Nakamitsu Tokyo Metropolitan University, Japan 4° R. Cirio, M. Costa, M. I. Ferrero, L. Lamberti, S. Maselli, C. Peroni, A. Solano, A. Staiano Universith di Torino, Dipartimento di Fisica Sperimentale, INFN, Torino, Italy 39 M. Dardo Facultd di Scienze, University of Torino, Alessandria, INFN Sezione di Torino, Torino, Italy 39 D. C. Bailey, D. Bandyopadhyay, F. Benard, S. Bhadra, M. Brkic, B. D. Burow, F. S. Chlebana, M. B. Crombie, G. F. Hartner, G. M. Levman, J. F. Martin, R. S. Orr, J. D. Prentice, C. R. Sampson, G. G. Stairs, R. J. Teuscher, T. S. Yoon University of Toronto, Toronto, O.n.t., Canada 34 F. W. Bullock, C. D. Catterall, J. C. Giddings, T. W. Jones, A. M. Khan, J. B. Lane, P. L. Makkar, D. Shaw, J. Shulman University College London, UK 46 K. Blankenship, J. Kochocki, B. Lu, L. W. Mo Virginia Polytechnic Institute, State University, Blacksburg, VA, USA 48 K. Charchuta, J. Ciborowski, J. Gajewski, G. Grzelak, M. Kasprzak, M. Krzyzanowski, K. Muchorowski, R. J. Nowak, J. M. Pawlak, A. Stopczyfiski, T. Tymieniecka, R. Walczak, A. K. Wr6blewski, J. A. Zakrzewski, A. F. Zarnecki Warsaw University, Institute of Experimental Physics, Warsaw, Poland 43 M. Adamus Institute for Nuclear Studies, Poland 43 H. Abramowicz 19, y. Eisenberg, C. Glasman 33, U. Karshon 31, A. Montag 3J, D. Revel, A. Shapira Weizmann Institute, Nuclear Physics Department, Rehovot, Israel 37 C. Foudas, C. Fordham, R. J. Loveless, A. Goussiou, I. Ali, B. Behrens, S. Dasu, D. D. Reeder, W. H. Smith, S. Silverstein University of Wisconsin, Madison, W1, USA 47 W. R. Frisken, K. M. Furutani, Y. Iga York University, North York, O.n.t., MARI, Stefano Maria, ZEUS Collaboration M., Derrick, D., Krakauer, S., Magill, B., Musgrave, J., Repond, S., Repond, R., Stanek, R. L., Talaga, J., Thron Argonne National Laboratory, Argonne, Il, USA 47 F., Arzarello, R., Ayad l, G., Bari, M., Basile, L., Bellagamba, D., Boscherini, A., Bruni, G., Bruni, P., Bruni, G., Cara Romeo, G., Castellini 2, M., Chiarini, L., Cifarelli, F., Cindolo, F., Ciralli, A., Contin, S., D'Auria, C., Del Papa, F., Frasconi, P., Giusti, G., Iacobucci, G., Laurenti, G., Levi, Q., Lin, B., Lisowski, G., Maccarrone, A., Margotti, T., Massam, R., Nania, C., Nemoz, F., Palmonari, G., Sartorelli, R., Timellini, Y., Zamora Garcia l, A., Zichichi University, Infn, Bologna, Bologna, Italy 39 A., Bargende, J., Crittenden, K., Desch, B., Diekmann, T., Doeker, A., Frey, M., Geert, G., Geitz, H., Hartmann, D., Haun, K., Heinloth, E., Hilger, H. P., Jakob, S., Kramarczyk, M., Kiickes 3, A., Ma, S., Mengel, J., Mollen, D., Monaldi4, H., Miisch 5, E., Paul, R., Schattevoy, J. L., Schneider, D., Schramm, R., Wedemeyer Physikalisches Institut der Universitiit Bonn, Bonn, Federal Republic of Germany 36 A., Cassidy, D. G., Cussan, N., Dyce, B., Foster, R., Gilmore, G. P., Heath, H. F., Heath, M., Lancaster, T. J., Llewellyn, J., Malo, C. J. S., Morgado, R. J., Tapper, S. S., Wilson, R. Yoshida H. H., Wills Physics Laboratory, University of, Bristol, Bristol, UK 46 R. R., Rau Brookhaven National Laboratory, Upton, L. I., Ny, USA 47 M., Arneodo, M., Schioppa, G., Susinno Calabria University, Physics, Department, Infn, Cosenza, Italy 39 A., Bernstein, A., Caldwell, I., Giala, J. A., Parson, S., Ritz, F., Sciulli 6, P. B., Straub, L., Wai, S., Yang Columbia University, Nevis, Lab, Irvington on, Hudson, USA 48 P., Borzemski, J., Chwastowski 7, A., Dwura~ny, A., Eskrey, Z. Jakubowski 8 B., Niziot, K., Piotrzkowski, M., Zachara, L., Zawiejski Institute of Nuclear Physic, Cracow, Poland 43 L., Adamczyk, B., Bednarek, K., Eskrey, K., Jelefi, D., Kisielewska, T., Kowalski, E., Rulikowska Zar~bska, L., Suszycki, J., Zaj0c Faculty of Physic, Academy of Mining, Nuclear T. e. c. h. n. i. q. u. e. s., Metallurgy, Cracow, Poland 43 T., Kgdzierski, A., Kotafiski, M., Przybyciefi Jagellonian University, Department of, Physic, Poland 43 L. A. T., Bauerdick, U., Behren, J. K., Bienlein, S., B6ttcher, C., Coldewey, A., Dannemann, G., Drew, P., Erhard 9, M., Flasifiski 10, I., Fleck, R. Gl~iser l., L, P., G6ttlicher, B., Gutjahr, T., Haa, L., Hagge, W., Hain, D., Hasell, H., Hultschig, G., Jahnen 12, P., Joo, M., Kasemann, R., Klanner, W., Koch, L., K6pke, U., K6tz, H., Kowalski, W., Kr6ger, J., Kriiger, J., Lab, A., Ladage, B., L6hr, M., L6we, D., Lfike, J., Mainusch, O., Manczak, M., Momayezi 13, J. S. T., Ng, S., Nickel, D., Notz, K. U., P6snecker 14, M., Rohde, J., Roldfin 15, E., Ros 7, U., Schneekloth, J., Schroeder, W., Schulz, F., Selonke, E., Stiliaris 15, E., Tscheslog 17, T., Tsurugai, W., Vogel 17, G., Wolf, C., Youngman Deutsches Elektronen Synchrotron DESE Hamburg, Federal Republic of Germany H. J., Grabosch, A., Leich, A., Meyer, C., Rethfeldt, S., Schlenstedt DESY Zeuthen, Institut fiir, Hochenergiephysik, Zeuthen, Federal Republic of Germany G., Barbagli, A., Francescato, M., Nuti, P., Pelfer University, Infn, Florence, Italy 39 G., Anzivino, R., Casaccia, S., De Pasquale, S., Qian, L., Votano INFN, Laboratori Nazionali di, Frascati, Frascati, Italy 39 A., Bamberger, A., Freidhof, T., Poser, S., S61dner Rembold, G., Theisen, T., Trefzger Physikalisches Institut der Universitgit Freiburg, Freiburg, Federal Republic of Germany 36 N. H., Brook, P. J., Bussey, A. T., Doyle, J. R., Forbe, V. A., Jamieson, C., Raine, D. H., Saxon Department of Physic, Astronomy, University of, Glasgow, Glasgow, UK 46 H., Brtickmann 18, G., Gloth, U., Holm, H., Kammerlocher, B., Kreb, T., Neumann, K., Wick Hamburg University, 1st Institute of Experimental, Physic, Hamburg, Federal Republic of Germany 36 A., Fiirtje, E., Lohrmann, J., Milewski 19, M., Nakahata 2°, N., Pavel, G., Poelz, W., Schott, J., Terron 15, Hnd Institute ofExperimental Physics, F. Zetsche Hamburg U. n. i. v. e. r. s. i. t. y., Federal Republic of Germany 36 T. C., Bacon, R., Beuselinck, I., Butterworth, E., Gallo, V. L., Harri, D. B., Miller, A., Prinia, J. K., Sedgbeer, A., Vorvolako, A., Whitfield Imperial College London, High Energy Nuclear Physics, Group, London, UK 46 T., Bienz, H., Kreutzmann, U., Mallik, E., Mccliment, M., Roco, M. Z., Wang University of lowa, Physics, Astronomy, Department, Iowa, City, USA 47 P., Cloth, D., Filges Forschungszentrum Jiilich, lnstitut fiir, Kernphysik, J. i. i. l. i. c. h. Federal Republic of Germany S. H., An, S. M., Hong, C. O., Kim, T. Y., Kim, S. W., Nam, S. K., Park, M. H., Suh, S. H., Yon Korea University, Seou[, Korea 4] R., Imlay, S., Kartik, H. J., Kim, R. R., Mcneil, W., Metcalf, V. K., Nadendla Louisiana State University, Department, ~ Physic, Baton, Rouge, La, USA 47 F., Barreiro 21, G., Case, L., Herv~s 22, L., Labarga 22, J., del Peso, Aut6noma Madrid, J. F. de Troc6niz 23 U. n. i. v. e. r., Depto de Fisica, Te6rlca, Madrid, Spain 45 F., Ikraiam, J. K., Mayer, G. R., Smith University of Manitoba, Winnipeg, Manitoba, Canada 34 F., Corriveau, D. J., Gilkinson, D. S., Hanna 6, J., Hartmann, L. W., Hung, J. N., Lira, R., Meijer Dree, J. W., Mitchell, P. M., Patel, L. E., Sinclair, D. G., Stair, Laurent, M. S. t., R., Ullmann McGill University, Montreal, Quebec, Canada, 34, 35 G. L., Bashindzhagyan, P. F., Ermolov, L. K., Gladilin, Y. A., Golubkov, V. A., Kuzmin, E. N., Kuznetsov, A. A., Savin, A. G., Voronin, N. P., Zotov Moscow State University, Institute of Nuclear, Pysic, Moscow, Russia 44 S., Bentvelsen, M., Botje, A., Dake, J., Engelen, P., de Jong, M., de Kamp, P., Kooijman, A., Kruse, H., van der Lugt, V., O'Dell, A., Tenner, H., Tiecke, H., Uijterwaa124, M., Vreeswijk, L., Wigger, E., de Wolf, R., van Woudenberg N1KHEF Amsterdam, Amsterdam, Netherlands 42 B., Bylsma, L. S., Durkin, K., Honscheid, C., Li, T. Y., Ling, K. W., Mclean, W. N., Murray, I. H., Park, T. A. Romanowski 25 R., Seidlein Ohio State University, Columbus, Oh, USA 47 G. A., Blair, A., Byrne, R. J., Cashmore, A. M., Cooper Sarkar, R. C. E., Devenish, D. M., Gingrich 26, P. M. Hallam Baker 7 N., Harnew, T., Khatri, K. R., Long, P., Luffman, 1., Mcarthur, P., Morawitz, J., Nash, S. J. P., Smith 27, N. C., Roocroft, F. F., Wilson Department of Physic, University of, Oxford, Oxford, UK 46 G., Abbiendi, R., Brugnera, R., Carlin, F., Dal Corso, M., De Giorgi, U., Dosselli, F., Gasparini, S., Limentani, M., Morandin, M., Posocco, L., Stanco, R., Stroili, C., Voci Dipartimento di Fisica dell Universita, Infn, Padova, ltaly 39 J. M., Butterworth, J., Bulmahn, G., Feild, B. Y., Oh 28, J., Whitmore 29 Pennsylvania State University, University, Park, Pa, USA 48 U., Contino, G., D'Agostini, M., Guida 30, M., Iori, Mari, Stefano Maria, G., Marini, M., Mattioli, A., Nigro Dipartimento di Fisica, Universiffz 'La, Sapienza, Infn, Rome, Italy 39 J. C., Hart, N. A., Mccubbin, K., Prytz, T. P., Shah, T. L., Short Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, UK 46 E., Barberi, N., Cartiglia, C., Heusch, B., Hubbard, J., Leslie, W., Lockman, K., O'Shaughnessy, H. F., Sadrozinski, A., Seiden, D., Zer Zion University of California, Santa, Cruz, Ca, USA 47 E., Badura, J., Biltzinger, R. J., Seifert, A. H., Walenta, G., Zech Fachbereich Physik der Universitgit Gesamthochschule Siegen, Siegen, Federal Republic of Germany 36 S., Dagan 31, A., Levy School of Physic, Tel Aviv, University, Tel, Aviv, Israel 38 T., Hasegawa, M., Hazumi, T., Ishii, S., Kasai 32, M., Kuze, S., Mine, Y., Nagasawa, T., Nagira, M., Nakao, H., Okuno, I., Suzuki, K., Tokushuku, S., Yamada, Y., Yamazaki Institute for Nuclear Study, University of, Tokyo, Tokyo, Japan 4° M., Chiba, R., Hamatsu, T., Hirose, S., Kitamura, S., Nagayama, Y., Nakamitsu Tokyo Metropolitan University, Japan 4° R., Cirio, M., Costa, M. I., Ferrero, L., Lamberti, S., Maselli, C., Peroni, A., Solano, A., Staiano Universith di Torino, Dipartimento di Fisica, Sperimentale, Infn, Torino, Italy 39 M., Dardo Facultd di Scienze, University of, Torino, Alessandria, INFN Sezione di, Torino, Torino, Italy 39 D. C., Bailey, D., Bandyopadhyay, F., Benard, S., Bhadra, M., Brkic, B. D., Burow, F. S., Chlebana, M. B., Crombie, G. F., Hartner, G. M., Levman, J. F., Martin, R. S., Orr, J. D., Prentice, C. R., Sampson, G. G., Stair, R. J., Teuscher, T. S., Yoon University of Toronto, Toronto, O. n. t., Canada 34 F. W., Bullock, C. D., Catterall, J. C., Gidding, T. W., Jone, A. M., Khan, J. B., Lane, P. L., Makkar, D., Shaw, J., Shulman University College London, UK 46 K., Blankenship, J., Kochocki, B., Lu, L. W., Mo Virginia Polytechnic Institute, State, University, Blacksburg, Va, USA 48 K., Charchuta, J., Ciborowski, J., Gajewski, G., Grzelak, M., Kasprzak, M., Krzyzanowski, K., Muchorowski, R. J., Nowak, J. M., Pawlak, A., Stopczyfiski, T., Tymieniecka, R., Walczak, A. K., Wr6blewski, J. A., Zakrzewski, A. F., Zarnecki Warsaw University, Institute of Experimental, Physic, Warsaw, Poland 43 M., Adamus Institute for Nuclear Studie, Poland 43 H., Abramowicz 19, Y., Eisenberg, C., Glasman 33, U., Karshon 31, A., Montag 3J, D., Revel, A., Shapira Weizmann Institute, Nuclear Physics, Department, Rehovot, Israel 37 C., Fouda, C., Fordham, R. J., Lovele, A., Goussiou, I., Ali, B., Behren, S., Dasu, D. D., Reeder, W. H., Smith, S., Silverstein University of Wisconsin, Madison, W1, USA 47 W. R., Frisken, K. M., Furutani, Y., Iga York University, North, York, and O. n., T.

Subjects
Physics, Nuclear and High Energy Physics, ZEUS (particle detector), Spectrometer, Physics::Instrumentation and Detectors, DESY, HERA, Particle detector, Calorimeter, Nuclear physics, Physics::Accelerator Physics, High Energy Physics::Experiment, Fermilab, Instrumentation, Beam (structure)
Abstract

A fully compensating uranium—scintillator calorimeter was constructed for the ZEUS detector at HERA. Several of the barrel calorimeter modules were subjected to beam tests at Fermilab before shipping them to DESY for installation. The calibrations of the modules used beams of electrons and hadrons, measuring the uniformity of the response, and checking the resolution. The runs also provided opportunity to test a large fraction of the actual ZEUS calorimeter readout system in an integrated beam environment more than one year before HERA turn on. The experiment utilized two computer controlled mechanical structures, one of which was capable of holding up to four modules in order to study shower containment, and a magnetic spectrometer with a high resolution beam tracking system. During two running periods, beams of 6 to 110 GeV containing e, μ, π, and p were used. The results show energy resolutions of 35%/ E for hadrons and 19%/ E for electrons, uniformities at the 1% level, energy nonlinearity less than 1%, and equal response for electrons and hadrons.

Published
1993

14. Differential cross sections, charge production asymmetry, and spin-density matrix elements for D*(2010) produced in 500 GeV/c pi^- nucleon interactions

Author

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

Subjects
Physics, Scattering cross-section, Nuclear and High Energy Physics, media_common.quotation_subject, FOS: Physical sciences, Polarization (waves), Asymmetry, High Energy Physics - Experiment, Nuclear physics, symbols.namesake, High Energy Physics - Experiment (hep-ex), Transverse momentum, symbols, Feynman diagram, High Energy Physics::Experiment, Fermilab, Atomic physics, Spin density, Nucleon, Nuclear Experiment, media_common
Abstract

We report differential cross sections for the production of D*(2010) produced in 500 GeV/c pi^- nucleon interactions from experiment E791 at Fermilab, as functions of Feynman-x (x_F) and transverse momentum squared (p_T^2). We also report the D* +/- charge asymmetry and spin-density matrix elements as functions of these variables. Investigation of the spin-density matrix elements shows no evidence of polarization. The average values of the spin alignment are \eta= 0.01 +- 0.02 and -0.01 +- 0.02 for leading and non-leading particles, respectively., Comment: LaTeX2e (elsart.cls). 13 pages, 6 figures (eps files). Submitted to Physics Letters B

Published
2002

15. Direct measurement of the pion valence-quark momentum distribution, the pion light-cone wave function squared

Author

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

Subjects
Quark, Physics, Particle physics, Valence (chemistry), General Physics and Astronomy, FOS: Physical sciences, Square (algebra), High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pion, Light cone, Transverse momentum, High Energy Physics::Experiment, Fermilab, Wave function, Nuclear Experiment
Abstract

We present the first direct measurements of the pion valence quark momentum distribution which is related to the square of the pion light-cone wave function. The measurements were carried out using data on diffractive dissociation of 500 GeV/c $��^-$ into di-jets from a platinum target at Fermilab experiment E791. The results show that the $|q\bar {q}>$ light-cone asymptotic wave function, which was developed using perturbative QCD methods, describes the data well for $Q^2 \sim 10 ~{\rm (GeV/c)^2}$ or more. We also measured the transverse momentum distribution of the diffractive di-jets., 13 pages, 4 figures

Published
2000

16. Search for Rare and Forbidden Dilepton Decays of the D+, Ds, and D0 Charmed Mesons

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
Physics, Nuclear and High Energy Physics, Antiparticle, Particle physics, Muon, Meson, Neutral current, High Energy Physics::Phenomenology, FOS: Physical sciences, Electron, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics::Experiment, Fermilab, Charm (quantum number)
Abstract

We report the results of a search for flavor-changing neutral current, lepton-flavor violating, and lepton-number violating decays of D+, Ds, and D0 mesons (and their antiparticles) into modes containing muons and electrons. Using data from Fermilab charm hadroproduction experiment E791, we examine the pi,l,l and K,l,l decay modes of D+ and Ds and the l+l- decay modes of D0. No evidence for any of these decays is found. Therefore, we present branching-fraction upper limits at 90% confidence level for the 24 decay modes examined. Eight of these modes have no previously reported limits, and fourteen are reported with significant improvements over previously published results., Comment: 12 pages, 3 figures, LaTeX, elsart.cls, epsf.sty, amsmath.sty Submitted to Physics Letters B

Published
1999
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17. Recent results from Fermilab E791

Author

S. B. Bracker, Daniel Ashery, T. Dubbs, N. R. Stanton, M. Aryal, H. A. Rubin, A. J. Slaughter, S. Watanabe, C. Zhang, T. Carter, J. Wiener, D. C. Langs, R. Weiss, S. MayTal-Beck, S. Radeztsky, A. Nguyen, A. Napier, K. Denisenko, D. Yi, M. V. Purohit, A.K.S. Santha, M. Sheaff, B. T. Meadows, M. D. Sokoloff, J. G. Smith, B. P. Quinn, A. C. dos Reis, J.J. Reidy, Ignacio Bediaga, B. Lundberg, Hermes Carvalho, D. J. Summers, R. A. Sidwell, I. Costa, S. Amato, J. Lichtenstadt, K. Gounder, L. Perera, J. M. De Miranda, K. Thorne, A.B. d'Oliveira, E.M. Aitala, G. Hurwitz, A. Álvarez Fernández, L. M. Cremaldi, E. Wolin, J. R. T. de Mello Neto, Patricia R. Burchat, J. A. Appel, A. K. Tripathi, K. C. Peng, D. Granite, M. Halling, N. Witchey, C. James, S. Takach, P.A. Kasper, A. J. Schwartz, P. Gagnon, G. Herrera, R. Zaliznyak, S. Gerson, N. W. Reay, C. L. Darling, J. Leslie, R. H. Milburn, Simon Kwan, K. O'Shaughnessy, Alberto Santoro, R. A. Burnstein, A. Rafatian, J. C. Anjos, G. Blaylock, K. Sugano, and S. Banerjee

Subjects
Nuclear physics, Physics, Particle decay, Pion, Meson, Branching fraction, Flavor-changing neutral current, High Energy Physics::Experiment, Charm (quantum number), Fermilab, Lepton
Abstract

Fermilab E791 is a high statistics charm experiment using a 500 GeV/c π− beam incident on a segmented target. We present results based on one third of the 1991‐1992 data, with particular emphasis on a search for the flavor changing neutral current decay D+→π+μ+μ−.

Published
1995
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18. Search for CP violation in charged D meson decays

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, 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, 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, media_common.quotation_subject, FOS: Physical sciences, Asymmetry, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), D meson, Pi, CP violation, Charm (quantum number), Fermilab, media_common
Abstract

We report results of a search for CP violation in the singly Cabibbo-suppressed decays D+ -> K- K+ pi+, phi pi+, K*(892)0 K+, and pi- pi+ pi+ based on data from the charm hadroproduction experiment E791 at Fermilab. We search for a difference in the D+ and D- decay rates for each of the final states. No evidence for a difference is seen. The decay rate asymmetry parameters A(CP), defined as the difference in the D+ and D- decay rates divided by the sum of the decay rates, are measured to be: A(CP)(K K pi) = -0.014 +/- 0.029, A(CP)(phi pi) = -0.028 +/- 0.036, A(CP)(K*(892) K) = -0.010 +/- 0.050, and A(CP)(pi pi pi) = -0.017 +/- 0.042., 13 pages, 5 figures, 1 table; Elsevier LaTeX

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