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187 results on '"I. Gaines"'

1. The K−π+ S-wave from the D+→K−π+π+ decay

Author: F. L. Fabbri, Y. Zhang, John Perry Cumalat, M. Boschini, A. Paris, K. B. Lee, L. Cinquini, V. Arena, D. Lopes Pegna, M. S. Nehring, P. H. Garbincius, M. Sheaff, Luigi Benussi, Kyung-Suk Cho, G. Chiodini, Iuri Muniz Pepe, C. Göbel, Harry Cheung, A. Sanchez-Hernandez, J. M. Link, S. Carrillo, R. Mitchell, M. H.L.S. Wang, A. Rahimi, Paolo Vitulo, V. Frisullo, C. M. Castromonte, P. D'Angelo, Erica Polycarpo, James R. Wilson, Luigi Moroni, J. Magnin, J. S. Kang, J. M. De Miranda, T. F. Davenport, Dario Menasce, S. Barberis, E. Luiggi, H. Hernandez, Germano Bonomi, G. Liguori, A. M. Lopez, J. W. Kwak, S. P. Ratti, Eric Wayne Vaandering, Marco A. Reyes, F. Vázquez, D. Y. Kim, Erik Gottschalk, A. C. dos Reis, J. Quinones, Stefano Bianco, S. Sala, A. Zallo, Cristina Riccardi, D. Engh, A. A. Machado, P. M. Yager, L. A. Garren, M. DiCorato, B. R. Ko, B. O'Reilly, J. N. Butler, G. Boca, Gianluca Alimonti, M. Mezzadri, James E Wiss, F. Leveraro, H. Park, T. Handler, A. Massafferri, Sandra Malvezzi, J. E. Moore, Daniele Pedrini, E. Casimiro, Ignacio Bediaga, P. Inzani, F. Prelz, L. Edera, Gabriele Gianini, I. Gaines, P. H. Kasper, Michael S. Webster, Robert Gardner, J. Otalora, Marco Rovere, C. Pontoglio, Kevin Stenson, Paul Sheldon, D. Pantea, A. E. Kreymer, C. Uribe, J. E. Ramirez, J. C. Anjos, C. Cawlfield, S. Erba, W. E. Johns, I. Segoni, E. Cuautle, Paolo Dini, M. Hosack, Agustín Cobos Cerutti, L. Agostino, A. Kryemadhi, M. M. Merlo, R. Kutschke, Y. S. Chung, and H. Mendez
Subjects: Physics, Nuclear and High Energy Physics, Amplitude, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Partial wave analysis, S-wave, Pi, Dalitz plot, High Energy Physics::Experiment, Statistical analysis, Atomic physics
Abstract: Using data from FOCUS (E831) experiment at Fermilab, we present a model independent partial-wave analysis of the K{sup -}{pi}{sup +} S-wave amplitude from the decay D{sup +} {yields} K{sup -}{pi}{sup +}{pi}{sup +}. The S-wave is a generic complex function to be determined directly from the data fit. The P- and D-waves are parameterized by a sum of Breit-Wigner amplitudes. The measurement of the S-wave amplitude covers the whole elastic range of the K{sup -}{pi}{sup +} system.
Published: 2009

2. Search for a pentaquark decaying to Ξ−π−

Author: C. Pontoglio, B. O'Reilly, Kevin Stenson, E. W. Vaandering, Paolo Dini, M. Hosack, E. Casimiro, Agustín Cobos Cerutti, Germano Bonomi, J. Magnin, I. Segoni, A. E. Kreymer, Daniele Pedrini, Gianluca Alimonti, S. Barberis, P. M. Yager, C. Uribe, J. E. Ramirez, Y. Zhang, Marco A. Reyes, James R. Wilson, G. Liguori, Stefano Bianco, P. Inzani, Robert K. Kutschke, C. M. Castromonte, D. Y. Kim, E. Luiggi, V. Arena, M. DiCorato, Gabriele Gianini, C. Cawlfield, D. Lopes Pegna, Cristina Riccardi, F. Vázquez, Luigi Benussi, P. D'Angelo, H. Park, D. Pantea, John Perry Cumalat, M. H.L.S. Wang, L. Cinquini, J. W. Kwak, S. P. Ratti, A. Rahimi, C. Göbel, Paolo Vitulo, James E Wiss, F. Leveraro, S. Sala, L. A. Garren, G. Chiodini, Sandra Malvezzi, J. M. Link, A. Zallo, S. Erba, A. Kryemadhi, D. Engh, M. Mezzadri, Ignacio Bediaga, B. R. Ko, F. L. Fabbri, Dario Menasce, F. Prelz, Kyung-Suk Cho, Erica Polycarpo, K. B. Lee, M. Sheaff, J. C. Anjos, V. Frisullo, Paul Sheldon, L. Edera, J. S. Kang, Harry Cheung, M. S. Nehring, J. Otalora, S. Carrillo, Erik Gottschalk, H. Hernandez, E. Cuautle, G. Boca, J. M. De Miranda, T. F. Davenport, W. E. Johns, M. M. Merlo, A. A. Machado, P. H. Kasper, Y. S. Chung, Iuri Muniz Pepe, H. Mendez, J. N. Butler, A. M. Lopez, I. Gaines, A. Paris, M. Boschini, P. H. Garbincius, A. Sanchez-Hernandez, L. Agostino, J. Quinones, Michael S. Webster, Robert Gardner, Marco Rovere, Luigi Moroni, A. C. dos Reis, R. Mitchell, T. Handler, and A. Massafferri
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Cascade, Branching fraction, Yield (chemistry), Pi, High Energy Physics::Experiment, Nuclear Experiment, Pentaquark
Abstract: We present a search for a pentaquark decaying strongly to $\Xi^-\pi^-$ in $\gamma N$ collisions at a center-of-mass energy up to 25 GeV/c^2. Finding no evidence for such a state in the mass range of 1480 MeV/c^2 to 2400 MeV/c^2, we set limits on the yield and on the cross section times branching ratio relative to $\Xi^*(1530)^0$.
Published: 2008

3. Study of Cabibbo suppressed decays of the Ds+ charmed-strange meson involving a KS0

Author: S. Barberis, H. Mendez, James E Wiss, L. Agostino, F. Leveraro, Luigi Moroni, D. Y. Kim, S. Erba, A. Kryemadhi, M. DiCorato, H. Park, J. Magnin, James R. Wilson, C. Cawlfield, Dario Menasce, G. Chiodini, Paul Sheldon, L. Edera, A. C. dos Reis, I. Segoni, E. Cuautle, Michael S. Webster, G. Liguori, M. H.L.S. Wang, A. Rahimi, G. Boca, D. Pantea, R. Kutschke, Robert Gardner, Marco Rovere, John Perry Cumalat, J. Otalora, C. Göbel, P. H. Kasper, Y. S. Chung, F. Vázquez, S. Sala, L. Cinquini, Paolo Vitulo, V. Arena, R. S. Tucker, Eric Wayne Vaandering, D. Lopes Pegna, Luigi Benussi, Germano Bonomi, Daniele Pedrini, I. Gaines, Marco A. Reyes, Erica Polycarpo, Kyung-Suk Cho, Gianluca Alimonti, M. Sheaff, Ignacio Bediaga, S. Carrillo, M. M. Merlo, J. M. Link, Paolo Dini, T. Handler, A. Massafferri, M. Hosack, E. Casimiro, Sandra Malvezzi, M. Mezzadri, A. E. Kreymer, L. A. Garren, P. Inzani, J. M. De Miranda, Agustín Cobos Cerutti, T. F. Davenport, B. O'Reilly, F. L. Fabbri, C. Uribe, J. E. Ramirez, F. Prelz, A. M. Lopez, Erik Gottschalk, Y. Zhang, Iuri Muniz Pepe, J. N. Butler, P. M. Yager, A. A. Machado, M. Boschini, Gabriele Gianini, J. W. Kwak, S. P. Ratti, P. H. Garbincius, M. S. Nehring, A. Sanchez-Hernandez, D. Engh, A. Paris, B. R. Ko, V. Frisullo, J. S. Kang, W. E. Johns, J. C. Anjos, E. Luiggi, H. Hernandez, R. Mitchell, A. Zallo, C. Pontoglio, Kevin Stenson, C. M. Castromonte, P. D'Angelo, J. Quinones, K. B. Lee, Harry Cheung, Stefano Bianco, and Cristina Riccardi
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Branching fraction, Mass spectrum
Abstract: We study the decay of D s + mesons into final states involving a K S 0 and report the discovery of Cabibbo suppressed decay modes D s + → K S 0 π − π + π + ( 179 ± 36 events) and D s + → K S 0 π + ( 113 ± 26 events). The branching fraction ratios for the new modes are Γ ( D s + → K S 0 π − π + π + ) Γ ( D s + → K S 0 K − π + π + ) = 0.18 ± 0.04 ± 0.05 and Γ ( D s + → K S 0 π + ) Γ ( D s + → K S 0 K + ) = 0.104 ± 0.024 ± 0.014 .
Published: 2008

4. Dalitz plot analysis of the D+→K−π+π+ decay in the FOCUS experiment

Author: V. Arena, D. Lopes Pegna, Luigi Benussi, K. B. Lee, Harry Cheung, Ignacio Bediaga, Stefano Bianco, Cristina Riccardi, J. Magnin, Dario Menasce, L. Edera, Paolo Dini, M. Hosack, E. Casimiro, Michael R. Pennington, J. Otalora, Agustín Cobos Cerutti, Erik Gottschalk, S. Carrillo, Michael S. Webster, Robert Gardner, Marco Rovere, Paul Sheldon, J. M. De Miranda, T. F. Davenport, James E Wiss, F. Leveraro, L. Agostino, A. A. Machado, E. Luiggi, H. Hernandez, Kyung-Suk Cho, J. Quinones, Gianluca Alimonti, W. E. Johns, Luigi Moroni, B. R. Ko, Marco A. Reyes, S. Erba, A. C. dos Reis, A. M. Lopez, R. Mitchell, Sandra Malvezzi, A. Kryemadhi, D. Pantea, C. Cawlfield, C. M. Castromonte, Eric Wayne Vaandering, Germano Bonomi, P. D'Angelo, F. Prelz, G. Chiodini, J. C. Anjos, J. W. Kwak, S. P. Ratti, R. Kutschke, D. Y. Kim, L. A. Garren, C. Göbel, P. M. Yager, M. Sheaff, D. Engh, Y. S. Chung, Daniele Pedrini, P. Inzani, Paolo Vitulo, Erica Polycarpo, A. Paris, M. H.L.S. Wang, A. Rahimi, H. Mendez, G. Boca, Iuri Muniz Pepe, M. Mezzadri, M. M. Merlo, S. Barberis, John Perry Cumalat, B. O'Reilly, Y. Zhang, A. E. Kreymer, C. Uribe, J. E. Ramirez, V. Frisullo, I. Segoni, E. Cuautle, T. Handler, A. Massafferri, L. Cinquini, J. S. Kang, J. N. Butler, I. Gaines, P. H. Kasper, M. Boschini, P. H. Garbincius, A. Sanchez-Hernandez, J. M. Link, A. Zallo, C. Pontoglio, Kevin Stenson, Gabriele Gianini, M. DiCorato, H. Park, James R. Wilson, G. Liguori, F. Vázquez, F. L. Fabbri, M. S. Nehring, and S. Sala
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Chiral perturbation theory, Distribution (mathematics), Scattering, Isospin, Dalitz plot, High Energy Physics::Experiment, State (functional analysis), Fermilab, Perturbation theory
Abstract: Using data collected by the high energy photoproduction experiment FOCUS at Fermilab we performed a Dalitz plot analysis of the Cabibbo favored decay D{sup +} {yields} K{sup -}{pi}{sup +}{pi}{sup +}. This study uses 53653 Dalitz-plot events with a signal fraction of {approx} 97%, and represents the highest statistics, most complete Dalitz plot analysis for this channel. Results are presented and discussed using two different formalisms. The first is a simple sum of Breit-Wigner functions with freely fitted masses and widths. It is the model traditionally adopted and serves as comparison with the already published analyses. The second uses a K-matrix approach for the dominant S-wave, in which the parameters are fixed by first fitting K{pi} scattering data and continued to threshold by Chiral Perturbation Theory. We show that the Dalitz plot distribution for this decay is consistent with the assumption of two body dominance of the final state interactions and the description of these interactions is in agreement with other data on the K{pi} final state.
Published: 2007

5. A non-parametric approach to measuring the K−π+ amplitudes in D+→K−K+π+ decay

Author: Marco A. Reyes, I. Segoni, E. Cuautle, Germano Bonomi, R. Kutschke, Willard Johns, Y. S. Chung, B. O'Reilly, Paolo Dini, M. Hosack, E. Casimiro, V. Frisullo, J. S. Kang, T. Handler, A. Massafferri, Agustín Cobos Cerutti, Eric Wayne Vaandering, K. B. Lee, P. M. Yager, D. Y. Kim, M. Boschini, P. H. Garbincius, A. Sanchez-Hernandez, M. M. Merlo, Paul Sheldon, M. DiCorato, L. A. Garren, A. Paris, Michael S. Webster, Robert Gardner, H. Mendez, Sandra Malvezzi, G. Boca, Marco Rovere, Y. Zhang, D. Engh, G. Chiodini, Gianluca Alimonti, Gabriele Gianini, J. Magnin, H. Park, Daniele Pedrini, Dario Menasce, Harry Cheung, C. Pontoglio, Kevin Stenson, F. Prelz, P. Inzani, J. M. Link, C. Göbel, S. Erba, B. R. Ko, John Perry Cumalat, Kyung-Suk Cho, Luigi Moroni, M. Sheaff, J. Quinones, L. Agostino, V. Arena, M. H.L.S. Wang, A. Rahimi, L. Cinquini, R. Mitchell, D. Lopes Pegna, A. Kryemadhi, A. C. dos Reis, A. Zallo, Luigi Benussi, Erica Polycarpo, Iuri Muniz Pepe, J. C. Anjos, M. S. Nehring, A. M. Lopez, S. Barberis, Paolo Vitulo, J. W. Kwak, Stefano Bianco, C. Cawlfield, Cristina Riccardi, James R. Wilson, G. Liguori, C. M. Castromonte, P. D'Angelo, F. Vázquez, Erik Gottschalk, A. A. Machado, M. Mezzadri, Fabrizio Fabbri, D. Pantea, E. Luiggi, H. Hernandez, A. E. Kreymer, C. Uribe, J. E. Ramirez, I. Gaines, P. H. Kasper, J. N. Butler, James E Wiss, F. Leveraro, L. Edera, J. Otalora, S. Sala, Sergio P Ratti, Ignacio Bediaga, S. Carrillo, J. M. De Miranda, and T. F. Davenport
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Crystallography, Amplitude, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Bar (unit), Large sample
Abstract: Using a large sample of D{sup +} {yields} K{sup -}K{sup +}{pi}{sup +} decays collected by the FOCUS photoproduction experiment at Fermilab, we present the first non-parametric analysis of the K{sup -}{pi}{sup +} amplitudes in D{sup +} {yields} K{sup -}K{sup +}{pi}{sup +} decay. The technique is similar to the technique used for our non-parametric measurements of the D{sup +} {yields} {bar K}*{sup 0} e{sup +}{nu} form factors. Although these results are in rough agreement with those of E687, we observe a wider S-wave contribution for the {bar K}*{sub 0}{sup 0}(1430) contribution than the standard, PDG [1] Breit-Wigner parameterization. We have some weaker evidence for the existence of a new, D-wave component at low values of the K{sup -}{pi}{sup +} mass.
Published: 2007

6. Reflections on the Semiotics of Relationships and Love in the Movie 'Her'

Author: Elliot I. Gaines
Subjects: media_common.quotation_subject, Semiotics, Art history, Art, media_common
Published: 2015

7. New measurement of BR(D+→ρ0μ+ν)BR(D+→K¯∗0μ+ν) branching ratio

Author: I. Gaines, P. H. Kasper, M. Bertani, J. N. Butler, M. Boschini, P. H. Garbincius, A. Sanchez-Hernandez, D. Y. Kim, P. M. Yager, Kyung-Suk Cho, Gianluca Alimonti, A. M. Lopez, K. B. Lee, G. Boca, Eric Wayne Vaandering, Harry Cheung, Germano Bonomi, M. H.L.S. Wang, A. Rahimi, L. A. Garren, F. Vá, J. S. Kang, A. Paris, Stefano Bianco, J. C. Anjos, M. Mezzadri, L. Agostino, J. W. Kwak, S. P. Ratti, S. Erba, B. O'Reilly, Y. Zhang, Cristina Riccardi, D. Engh, A. Kryemadhi, Daniele Pedrini, C. Cawlfield, I. Segoni, P. Inzani, E. Cuautle, Sandra Malvezzi, C. Gö, Luigi Moroni, C. M. Castromonte, James R. Wilson, P. D'Angelo, Paolo Dini, G. Liguori, W. E. Johns, F. Prelz, M. Hosack, S. Barberis, E. Casimiro, Gabriele Gianini, M. M. Merlo, A. C. dos Reis, H. Mendez, Agustín Cobos Cerutti, M. DiCorato, Michael S. Webster, Robert Gardner, C. Pontoglio, Paul Sheldon, Marco Rovere, Kevin Stenson, J. E. Moore, H. Park, R. Kutschke, John Perry Cumalat, F. L. Fabbri, Y. S. Chung, L. Cinquini, M. Sheaff, R. Mitchell, Marco A. Reyes, Iuri Muniz Pepe, A. Zallo, J. Quinones, M. S. Nehring, B. R. Ko, T. Handler, A. Massafferri, J. M. Link, Erica Polycarpo, G. Chiodini, Paolo Vitulo, S. Sala, Erik Gottschalk, Ignacio Bediaga, S. Carrillo, A. A. Machado, J. M. De Miranda, T. F. Davenport, S. Pacetti, L. Edera, J. Otalora, James E Wiss, F. Leveraro, J. Magnin, Dario Menasce, V. Arena, D. Lopes Pegna, Luigi Benussi, D. Pantea, A. E. Kreymer, C. Uribe, J. E. Ramirez, E. Luiggi, and H. Hernandez
Subjects: Physics, Nuclear and High Energy Physics, Branching fraction, Analytical chemistry, Charm (quantum number)
Abstract: Using data collected by the FOCUS experiment at Fermilab, we present a new measurement of the charm semileptonic branching ratio BR ( D + → ρ 0 μ + ν ) BR ( D + → K ¯ ∗ 0 μ + ν ) . From a sample of 320 ± 44 and 11372 ± 161 D + → ρ 0 μ + ν and D + → K − π + μ + ν events respectively, we find BR ( D + → ρ 0 μ + ν ) BR ( D + → K ¯ ∗ 0 μ + ν ) = 0.041 ± 0.006 ( stat ) ± 0.004 ( syst ) .
Published: 2006

8. Study of the decay asymmetry parameter and CP violation parameter in the Λc+→Λπ+ decay

Author: Eric Wayne Vaandering, M. Boschini, D. Y. Kim, P. H. Garbincius, Y. Zhang, J. Olatora, L. A. Garren, A. Sanchez-Hernandez, J. E. Moore, M. Sheaff, Germano Bonomi, B. O'Reilly, A. E. Kreymer, Michael S. Webster, Robert Gardner, C. Uribe, J. E. Ramirez, Stefano Bianco, Cristina Riccardi, G. Chiodini, L. Edera, V. Arena, S. Barberis, D. Lopes Pegna, Iuri Muniz Pepe, P. M. Yager, Marco Rovere, K. B. Lee, Kyung-Suk Cho, Paolo Dini, Gabriele Gianini, Luigi Benussi, M. Hosack, E. Casimiro, S. Carrillo, C. Göbel, Harry Cheung, Paolo Vitulo, James R. Wilson, Agustín Cobos Cerutti, E. Luiggi, H. Hernandez, Marco A. Reyes, J. M. De Miranda, T. F. Davenport, G. Liguori, D. Pantea, Erica Polycarpo, L. Agostino, J. Quinones, C. Cawlfield, M. Mezzadri, I. Segoni, E. Cuautle, F. Vázquez, A. Kryemadhi, S. Erba, M. DiCorato, S. Pacetti, C. M. Castromonte, P. D'Angelo, S. Sala, A. Zallo, P. H. Kasper, Erik Gottschalk, F. L. Fabbri, H. Park, C. Pontoglio, John Perry Cumalat, Paul Sheldon, A. A. Machado, Kevin Stenson, James E Wiss, F. Leveraro, H. Mendez, L. Cinquini, Gianluca Alimonti, Ignacio Bediaga, M. S. Nehring, J. Magnin, Dario Menasce, M. M. Merlo, R. Kutschke, J. M. Link, Y. S. Chung, Sandra Malvezzi, F. Prelz, W. E. Johns, J. C. Anjos, Daniele Pedrini, P. Inzani, G. Boca, J. S. Kang, J. W. Kwak, S. P. Ratti, D. Engh, B. R. Ko, M. Bertani, A. M. Lopez, R. Mitchell, A. Paris, J. N. Butler, T. Handler, A. Massafferri, M. H.L.S. Wang, A. Rahimi, I. Gaines, Luigi Moroni, and A. C. dos Reis
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Antiparticle, media_common.quotation_subject, Particle, CP violation, Fermilab, Asymmetry, media_common
Abstract: Using data from the FOCUS (E831) experiment at Fermilab, we present a new measurement of the weak decay-asymmetry parameter α Λ c in Λ c + → Λ π + decay. Comparing particle with antiparticle decays, we obtain the first measurement of the CP violation parameter A ≡ α Λ c + α Λ ¯ c α Λ c − α Λ ¯ c . We obtain α Λ c = − 0.78 ± 0.16 ± 0.19 and A = − 0.07 ± 0.19 ± 0.24 where errors are statistical and systematic.
Published: 2006

9. A non-parametric approach to the D+→K¯∗0μ+ν form factors

Author: D. Y. Kim, A. Paris, C. Pontoglio, S. Carrillo, L. Agostino, Kevin Stenson, C. Cawlfield, J. M. De Miranda, A. Kryemadhi, T. F. Davenport, Marco A. Reyes, Germano Bonomi, F. L. Fabbri, D. Engh, M. Mezzadri, D. Pantea, M. Bertani, Daniele Pedrini, J. C. Anjos, B. R. Ko, P. D'Angelo, M. DiCorato, Erik Gottschalk, H. Park, S. Sala, M. S. Nehring, Sandra Malvezzi, A. E. Kreymer, C. Uribe, J. E. Ramirez, P. Inzani, Ignacio Bediaga, J. N. Butler, A. A. Machado, Kyung-Suk Cho, James E Wiss, F. Leveraro, M. M. Merlo, Paolo Dini, F. Prelz, W. E. Johns, Gabriele Gianini, B. O'Reilly, M. Hosack, E. Casimiro, Eric Wayne Vaandering, G. Boca, Luigi Moroni, Agustín Cobos Cerutti, L. Edera, Y. Zhang, J. S. Kang, R. Kutschke, L. A. Garren, A. C. dos Reis, J. Magnin, S. Barberis, Dario Menasce, G. Chiodini, Y. S. Chung, T. Handler, J. E. Moore, James R. Wilson, J. W. Kwak, S. P. Ratti, A. Massafferri, G. Liguori, A. Zallo, I. Gaines, E. Luiggi, H. Hernandez, P. M. Yager, John Perry Cumalat, C. Göbel, Paolo Vitulo, J. Quinones, F. Vázquez, I. Segoni, V. Arena, L. Cinquini, E. Cuautle, R. Mitchell, D. Lopes Pegna, Michael S. Webster, Robert Gardner, M. Boschini, P. H. Kasper, Marco Rovere, Luigi Benussi, Erica Polycarpo, P. H. Garbincius, A. Sanchez-Hernandez, H. Mendez, J. M. Link, Paul Sheldon, M. Sheaff, Iuri Muniz Pepe, S. Erba, Gianluca Alimonti, A. M. Lopez, K. B. Lee, Harry Cheung, M. H.L.S. Wang, A. Rahimi, Stefano Bianco, and Cristina Riccardi
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Form factor (quantum field theory), Nonparametric statistics, Fermilab, Helicity basis, Focus (optics), Helicity, Large sample
Abstract: Using a large sample of D + → K − π + μ + ν decays collected by the FOCUS photoproduction experiment at Fermilab, we present the first measurements of the helicity basis form factors free from the assumption of spectroscopic pole dominance. We also present the first information on the form factor that controls the s -wave interference discussed in a previous paper by the FOCUS Collaboration. We find reasonable agreement with the usual assumption of spectroscopic pole dominance and measured form factor ratios.
Published: 2006

10. Application of genetic programming to high energy physics event selection

Author: D. Y. Kim, S. Carrillo, Erik Gottschalk, B. R. Ko, Stefano Bianco, A. A. Machado, Y. Zhang, S. Pacetti, Cristina Riccardi, I. Segoni, John Perry Cumalat, E. Cuautle, S. Barberis, L. Cinquini, A. E. Kreymer, Daniele Pedrini, C. Uribe, J. E. Ramirez, Marco A. Reyes, S. Sala, Eric Wayne Vaandering, P. H. Kasper, J. C. Anjos, P. Inzani, M. Sheaff, Erica Polycarpo, Kyung-Suk Cho, J. W. Kwak, S. P. Ratti, J. M. De Miranda, A. C. Dos Reis, S. Erba, Gabriele Gianini, L. A. Garren, D. Engh, R. Kutschke, James R. Wilson, J. Magnin, K. B. Lee, T. Handler, A. Massafferri, G. Liguori, Dario Menasce, James E Wiss, P. M. Yager, C. Cawlfield, G. Chiodini, T.F. Davenport, Iuri Muniz Pepe, L. Edera, C. M. Castromonte, J. E. Moore, E. Luiggi, H. Hernandez, Germano Bonomi, P. D'Angelo, Harry Cheung, C. Göbel, Y. S. Chung, R. Mitchell, Paolo Vitulo, G. Boca, Gianluca Alimonti, H. Mendez, A. Zallo, D. Pantea, C. Pontoglio, B. O'Reilly, Kevin Stenson, I. Bediaga, F. Vázquez, J. Quinones, M. M. Merlo, W. E. Johns, V. Arena, L. Agostino, M. Mezzadri, A. Kryemadhi, D. Lopes Pegna, Luigi Benussi, J. M. Link, Michael S. Webster, Robert Gardner, F. L. Fabbri, F. Leveraro, Marco Rovere, M. Boschini, P. H. Garbincius, M. S. Nehring, A. Sanchez-Hernandez, M. Bertani, Luigi Moroni, Sandra Malvezzi, F. Prelz, J. N. Butler, I. Gaines, Paul Sheldon, A. Paris, M. H.L.S. Wang, A. Rahimi, A. Cerutti, Paolo Dini, M. Hosack, E. Casimiro, A. M. Lopez, M. DiCorato, H. Park, and J. S. Kang
Subjects: Event selection, Physics, High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, Particle physics, Theoretical physics, FOS: Physical sciences, Genetic programming, Focus (optics), Instrumentation, Analysis method, High Energy Physics - Experiment
Abstract: We review genetic programming principles, their application to FOCUS data samples, and use the method to study the doubly Cabibbo suppressed decay D+ -> K+ pi+ pi- relative to its Cabibbo favored counterpart, D+ -> K- pi+ pi+. We find that this technique is able to improve upon more traditional analysis methods. To our knowledge, this is the first application of the genetic programming technique to High Energy Physics data., 39 pages
Published: 2005

11. Search for Λc+→pK+π− and Ds+→K+K+π− using genetic programming event selection

Author: M. DiCorato, H. Park, Sandra Malvezzi, F. L. Fabbri, R. Kutschke, Germano Bonomi, S. Sala, G. Boca, V. Arena, F. Prelz, Y. S. Chung, E. Luiggi, H. Hernandez, M. Boschini, P. H. Garbincius, A. Sanchez-Hernandez, D. Lopes Pegna, Luigi Benussi, M. S. Nehring, C. Cawlfield, S. Erba, Kyung-Suk Cho, P. M. Yager, A. E. Kreymer, B. O'Reilly, J. C. Anjos, C. Uribe, Ignacio Bediaga, J. E. Ramirez, Y. Zhang, J. M. Link, James E Wiss, F. Leveraro, Paolo Dini, M. Hosack, E. Casimiro, D. Y. Kim, Eric Wayne Vaandering, K. B. Lee, L. Edera, Erica Polycarpo, James R. Wilson, D. Pantea, Gianluca Alimonti, J. Magnin, John Perry Cumalat, L. Cinquini, M. M. Merlo, S. Carrillo, Dario Menasce, G. Liguori, L. A. Garren, W. E. Johns, J. Quinones, Harry Cheung, F. Vázquez, Gabriele Gianini, Daniele Pedrini, Erik Gottschalk, J. M. De Miranda, L. Agostino, M. Bertani, P. Inzani, T. F. Davenport, A. A. Machado, A. Kryemadhi, J. N. Butler, S. Barberis, I. Segoni, C. M. Castromonte, S. Pacetti, I. Gaines, P. H. Kasper, J. S. Kang, E. Cuautle, Marco A. Reyes, P. D'Angelo, Paul Sheldon, A. Zallo, Stefano Bianco, G. Chiodini, M. Mezzadri, Cristina Riccardi, C. Pontoglio, C. Göbel, Paolo Vitulo, Kevin Stenson, H. Mendez, J. E. Moore, J. W. Kwak, S. P. Ratti, D. Engh, R. Mitchell, A. M. Lopez, T. Handler, A. Massafferri, M. H.L.S. Wang, A. Rahimi, A. Cerutti, A. Paris, Luigi Moroni, A. C. dos Reis, Michael S. Webster, Robert Gardner, Marco Rovere, B. R. Ko, M. Sheaff, and Iuri Muniz Pepe
Subjects: Physics, Event selection, Nuclear and High Energy Physics, Crystallography
Abstract: We apply a genetic programming technique to search for the doubly Cabibbo suppressed decays Λ c + → p K + π − and D s + → K + K + π − . We normalize these decays to their Cabibbo favored partners and find BR ( Λ c + → p K + π − ) / BR ( Λ c + → p K − π + ) = ( 0.05 ± 0.26 ± 0.02 ) % and BR ( D s + → K + K + π − ) / BR ( D s + → K − K + π + ) = ( 0.52 ± 0.17 ± 0.11 ) % where the first errors are statistical and the second are systematic. Expressed as 90% confidence levels (CL), we find
Published: 2005

12. Search for T violation in charm meson decays

Author: M. Boschini, A. Paris, Kyung-Suk Cho, P. H. Garbincius, A. Sanchez-Hernandez, S. Sala, J. M. Link, B. R. Ko, S. Barberis, M. Sheaff, M. Mezzadri, John Perry Cumalat, L. Cinquini, James E Wiss, C. Cawlfield, D. Y. Kim, J. Magnin, Erik Gottschalk, Dario Menasce, Paul Sheldon, M. H.L.S. Wang, A. Rahimi, M. M. Merlo, J. E. Moore, A. Cerutti, E. Luiggi, H. Hernandez, A. A. Machado, A. E. Kreymer, Gianluca Alimonti, Sandra Malvezzi, C. Uribe, J. E. Ramirez, R. Kutschke, I. Gaines, P. H. Kasper, Michael S. Webster, Iuri Muniz Pepe, Robert Gardner, Marco Rovere, S. Carrillo, G. Boca, F. Prelz, Eric Wayne Vaandering, M. Bertani, Y. S. Chung, D. Engh, T. F. Davenport, A. M. Lopez, L. A. Garren, Gabriele Gianini, S. Erba, C. Pontoglio, L. Agostino, K. B. Lee, G. Chiodini, S. Pacetti, Kevin Stenson, Luigi Moroni, J. N. Butler, D. Pantea, A. Kryemadhi, P. M. Yager, C. Göbel, Paolo Vitulo, F. L. Fabbri, J. W. Kwak, S. P. Ratti, J. M. De Miranda, F. Leveraro, Harry Cheung, Erica Polycarpo, M. S. Nehring, A. C. Dos Reis, James R. Wilson, L. Edera, G. Liguori, Stefano Bianco, F. Vázquez, Cristina Riccardi, A. Zallo, H. Mendez, I. Segoni, E. Cuautle, Germano Bonomi, B. O'Reilly, Y. Zhang, J. S. Kang, I. Bediaga, Daniele Pedrini, P. Inzani, J. Quinones, V. Arena, D. Lopes Pegna, C. M. Castromonte, Luigi Benussi, P. D'Angelo, M. DiCorato, H. Park, Paolo Dini, M. Hosack, E. Casimiro, J. C. Anjos, T. Handler, A. Massafferri, W. E. Johns, R. Mitchell, and Marco A. Reyes
Subjects: Physics, High Energy Physics - Experiment (hep-ex), Particle physics, Nuclear and High Energy Physics, Meson, CPT symmetry, media_common.quotation_subject, FOS: Physical sciences, Charm (quantum number), Atomic physics, Asymmetry, media_common, High Energy Physics - Experiment
Abstract: Using data from the FOCUS (E831) experiment, we have searched for T violation in charm meson decays using the four-body decay channels $D^0 \to K^-K^+\pi^-\pi^+$, $D^+ \to K^0_SK^+\pi^-\pi^+$, and $D^+_s \to K^0_SK^+\pi^-\pi^+$. The T violation asymmetry is obtained using triple-product correlations and assuming the validity of the CPT theorem. We find the asymmetry values to be $A_Tviol (D^0) = 0.010 \pm 0.057(stat.) \pm 0.037(syst.)$, $A_Tviol (D^+) = 0.023 \pm 0.062(stat.) \pm 0.022(syst.)$, and $A_Tviol (D^+_s) = -0.036 \pm 0.067(stat.) \pm 0.023(syst.)$. Each measurement is consistent with no T violation. New measurements of the CP asymmetries for some of these decay modes are also presented., Comment: 17 pages,6 figures,submitted to Phys.Lett.B
Published: 2005
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13. Study of Λc+ Cabibbo favored decays containing a Λ baryon in the final state

Author: Erik Gottschalk, Marco A. Reyes, A. A. Machado, J. M. Link, C. Pontoglio, M. Mezzadri, Paolo Dini, M. Hosack, E. Casimiro, A. Sánchez-Herńndez, Y. Zhang, Kevin Stenson, J. E. Moore, S. Carrillo, B. R. Ko, C. Cawlfield, James R. Wilson, M. Sheaff, S. Erba, G. Liguori, J. Quinones, D. Engh, S. Barberis, T. Handler, A. Massafferri, G. Boca, J. M. De Miranda, Erica Polycarpo, T. F. Davenport, F. Vázquez, F. L. Fabbri, Gianluca Alimonti, R. Mitchell, R. Kutschke, Iuri Muniz Pepe, V. Arena, Stefano Bianco, D. Pantea, Eric Wayne Vaandering, Gabriele Gianini, D. Lopes Pegna, John Perry Cumalat, Cristina Riccardi, M. S. Nehring, C. M. Castromonte, Y. S. Chung, L. Cinquini, Luigi Benussi, P. D'Angelo, K. B. Lee, P. M. Yager, S. Pacetti, Germano Bonomi, L. A. Garren, Sandra Malvezzi, H. Mendez, Harry Cheung, Paul Sheldon, L. Agostino, A. E. Kreymer, A. Zallo, J. W. Kwak, S. P. Ratti, C. Uribe, J. E. Ramirez, A. Kryemadhi, B. O'Reilly, L. Edera, I. Segoni, F. Prelz, E. Cuautle, M. M. Merlo, S. Sala, E. Luiggi, H. Hernandez, G. Chiodini, James E Wiss, F. Leveraro, Ignacio Bediaga, C. Göbel, J. S. Kang, Paolo Vitulo, J. Magnin, Dario Menasce, M. DiCorato, H. Park, A. M. Lopez, I. Gaines, P. H. Kasper, M. Bertani, J. N. Butler, Daniele Pedrini, M. H.L.S. Wang, A. Rahimi, A. Cerutti, M. Boschini, P. Inzani, P. H. Garbincius, J. C. Anjos, A. Paris, W. E. Johns, Kyung-Suk Cho, D. Y. Kim, Luigi Moroni, A. C. dos Reis, Michael S. Webster, Robert Gardner, and Marco Rovere
Subjects: Physics, Baryon, Nuclear and High Energy Physics, Crystallography, Quantum mechanics, Mass spectrum, Hyperon, Lambda
Abstract: Using data from the FOCUS experiment (FNAL–E831), we study the decay of Λ c + baryons into final states containing a Λ hyperon. The branching fractions of Λ c + into Λ π + , Λ π + π + π − and Λ K ¯ 0 K + relative to that into p K − π + are measured to be 0.217 ± 0.013 ± 0.020 , 0.508 ± 0.024 ± 0.024 and 0.142 ± 0.018 ± 0.022 , respectively. We also report new measurements of Γ ( Λ c + → Σ 0 π + ) Γ ( Λ c + → Λ π + ) = 1.09 ± 0.11 ± 0.19 , Γ ( Λ c + → Σ 0 π + π + π − ) Γ ( Λ c + → Λ π + π + π − ) = 0.26 ± 0.06 ± 0.09 and Γ ( Λ c + → Ξ ( 1690 ) 0 ( Λ K ¯ 0 ) K + ) Γ ( Λ c + → Λ K ¯ 0 K + ) = 0.32 ± 0.10 ± 0.04 . Further, an analysis of the subresonant structure for the Λ c + → Λ π + π + π − decay mode is presented.
Published: 2005

14. Hadronic mass spectrum analysis of D+→K−π+μ+ν decay and measurement of the K∗(892)0 mass and width

Author: J.M. Link, P.M. Yager, J.C. Anjos, I. Bediaga, C. Göbel, A.A. Machado, J. Magnin, A. Massafferri, J.M. de Miranda, I.M. Pepe, E. Polycarpo, A.C. dos Reis, S. Carrillo, E. Casimiro, E. Cuautle, A. Sánchez-Hernández, C. Uribe, F. Vázquez, L. Agostino, L. Cinquini, J.P. Cumalat, B. O'Reilly, I. Segoni, K. Stenson, J.N. Butler, H.W.K. Cheung, G. Chiodini, I. Gaines, P.H. Garbincius, L.A. Garren, E. Gottschalk, P.H. Kasper, A.E. Kreymer, R. Kutschke, M. Wang, L. Benussi, M. Bertani, S. Bianco, F.L. Fabbri, A. Zallo, M. Reyes, C. Cawlfield, D.Y. Kim, A. Rahimi, J. Wiss, R. Gardner, A. Kryemadhi, Y.S. Chung, J.S. Kang, B.R. Ko, J.W. Kwak, K.B. Lee, K. Cho, H. Park, G. Alimonti, S. Barberis, M. Boschini, A. Cerutti, P. D'Angelo, M. DiCorato, P. Dini, L. Edera, S. Erba, P. Inzani, F. Leveraro, S. Malvezzi, D. Menasce, M. Mezzadri, L. Moroni, D. Pedrini, C. Pontoglio, F. Prelz, M. Rovere, S. Sala, T.F. Davenport, V. Arena, G. Boca, G. Bonomi, G. Gianini, G. Liguori, D. Lopes Pegna, M.M. Merlo, D. Pantea, S.P. Ratti, C. Riccardi, P. Vitulo, H. Hernandez, A.M. Lopez, H. Mendez, A. Paris, J. Quinones, J.E. Ramirez, Y. Zhang, J.R. Wilson, T. Handler, R. Mitchell, D. Engh, M. Hosack, W.E. Johns, E. Luiggi, J.E. Moore, M. Nehring, P.D. Sheldon, E.W. Vaandering, M. Webster, and M. Sheaff
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Branching fraction, Hadron, Analytical chemistry, Mass spectrum, Spectrum analysis, Mass spectrum analysis
Abstract: We present a Kπ mass spectrum analysis of the four-body semileptonic charm decay D+→K−π+μ+ν in the range of 0.65GeV/c2
Published: 2005

15. Study of the D0→K+K−π+π− decay

Author: V. Arena, D. Lopes Pegna, Luigi Benussi, I. Gaines, K. B. Lee, A. M. Lopez, T. Handler, A. Massafferri, I. Segoni, D. Y. Kim, Marco A. Reyes, A. E. Kreymer, M. Boschini, E. Cuautle, Gianluca Alimonti, L. Agostino, C. Uribe, P. H. Garbincius, J. E. Ramirez, M. Mezzadri, A. Sanchez-Hernandez, S. Erba, Y. Zhang, P. H. Kasper, A. Kryemadhi, Harry Cheung, J. W. Kwak, S. P. Ratti, M. Bertani, J. S. Kang, Michael S. Webster, Robert Gardner, J. E. Moore, James E Wiss, Erica Polycarpo, Marco Rovere, L. Edera, D. Engh, B. R. Ko, P. M. Yager, M. H.L.S. Wang, R. Mitchell, A. Rahimi, D. Pantea, Kyung-Suk Cho, Sandra Malvezzi, F. Leveraro, J. N. Butler, M. Sheaff, P. D'Angelo, M. M. Merlo, J. Magnin, Stefano Bianco, A. Zallo, F. Prelz, Erik Gottschalk, Dario Menasce, S. Carrillo, R. Kutschke, A. A. Machado, Cristina Riccardi, Daniele Pedrini, A. Paris, Y. S. Chung, J. M. De Miranda, T. F. Davenport, John Perry Cumalat, P. Inzani, G. Chiodini, J. Quinones, C. Göbel, L. Cinquini, Paolo Vitulo, Gabriele Gianini, C. Cawlfield, H. Mendez, C. Pontoglio, Paolo Dini, M. Hosack, E. Casimiro, E. Luiggi, H. Hernandez, S. Sala, Kevin Stenson, Agustín Cobos Cerutti, Germano Bonomi, Paul Sheldon, S. Barberis, Eric Wayne Vaandering, Luigi Moroni, G. Boca, Ignacio Bediaga, A. C. dos Reis, L. A. Garren, B. O'Reilly, Iuri Muniz Pepe, M. DiCorato, H. Park, W. E. Johns, J. C. Anjos, James R. Wilson, G. Liguori, F. Vázquez, J. M. Link, F. L. Fabbri, and M. S. Nehring
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Crystallography, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Order (ring theory)
Abstract: Using data from the FOCUS (E831) experiment at Fermilab, the authors present a new measurement for the Cabibbo-suppressed decay mode D{sup 0} {yields} K{sup +}K{sup -}{pi}{sup +}{pi}{sup -}. They measure: {Lambda}(D{sup 0} {yields} K{sup +}K{sup -}{pi}{sup +}{pi}{sup -})/{Lambda}(D{sup 0} {yields} K{sup -}{pi}{sup -}{pi}{sup +}{pi}{sup +}) = 0.0295 {+-} 0.0011 {+-} 0.0008. An amplitude analysis has been performed in order to determine the resonant substructure of this decay mode. The dominant components are the decays D{sup 0} {yields} K{sub 1}(1270){sup +} K{sup -}, D{sup 0} {yields} K{sub 1}(1400){sup +}K{sup -} and D{sup 0} {yields} {rho}(770){sup 0}{phi}(1020).
Published: 2005

16. Analysis of the semileptonic decay D0→K¯0π−μ+ν

Author: Erik Gottschalk, A. A. Machado, C. Cawlfield, John Perry Cumalat, L. Cinquini, G. Boca, M. Boschini, P. H. Garbincius, B. R. Ko, A. Sanchez-Hernandez, S. Erba, P. M. Yager, W. E. Johns, Y. Zhang, Kyung-Suk Cho, G. Chiodini, Daniele Pedrini, S. Barberis, Paolo Dini, M. Hosack, James E Wiss, F. Leveraro, C. Göbel, H. Park, P. Inzani, A. Zallo, E. Casimiro, M. DiCorato, L. Agostino, Marco A. Reyes, M. Bertani, Paolo Vitulo, M. Sheaff, Sandra Malvezzi, V. Arena, J. M. Link, D. Lopes Pegna, Luigi Benussi, Erica Polycarpo, D. Y. Kim, J. S. Kang, J. C. Anjos, J. W. Kwak, S. P. Ratti, Iuri Muniz Pepe, James R. Wilson, F. Prelz, A. Kryemadhi, J. Magnin, J. N. Butler, Dario Menasce, D. Engh, G. Liguori, Gabriele Gianini, P. D'Angelo, F. Vázquez, C. Pontoglio, Germano Bonomi, F. L. Fabbri, Kevin Stenson, I. Gaines, P. H. Kasper, Gianluca Alimonti, M. S. Nehring, I. Segoni, Stefano Bianco, E. Cuautle, B. O'Reilly, Paul Sheldon, H. Mendez, Cristina Riccardi, K. B. Lee, J. Quinones, Harry Cheung, M. M. Merlo, J. E. Moore, R. Kutschke, Y. S. Chung, Eric Wayne Vaandering, L. A. Garren, M. Mezzadri, A. E. Kreymer, C. Uribe, J. E. Ramirez, A. Rahimi, A. Cerutti, A. M. Lopez, A. Paris, E. Luiggi, H. Hernandez, D. Pantea, T. Handler, A. Massafferri, L. Edera, S. Sala, R. Mitchell, Ignacio Bediaga, S. Carrillo, J. M. De Miranda, T. F. Davenport, Michael S. Webster, Robert Gardner, Marco Rovere, Luigi Moroni, Michael Wang, and A. C. dos Reis
Subjects: Nuclear physics, Quantum chromodynamics, Physics, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, Amplitude, Branching fraction, Form factor (quantum field theory), Fermilab, Measure (mathematics), Particle identification
Abstract: Using data collected by the fixed target Fermilab experiment FOCUS, we present several first measurements for the semileptonic decay D0→K¯0π−μ+ν. Using a model that includes a K¯0π− s-wave component, we measure the form factor ratios to be rv=1.71±0.68±0.34 and r2=0.91±0.37±0.10 and the s-wave amplitude to be A=0.35±0.22±0.05GeV−1. Finally, we measure the vector semileptonic branching ratio Γ(D0→K*(892)−μ+ν)Γ(D0→K¯0π−π+)=0.337±0.034±0.013.
Published: 2005

17. A study of D0→KS0KS0X decay channels

Author: Michael S. Webster, Robert Gardner, Marco Rovere, M. M. Merlo, J. Quinones, T. Handler, A. Massafferri, P. M. Yager, E. Luiggi, H. Hernandez, D. Y. Kim, S. Carrillo, Marco A. Reyes, Eric Wayne Vaandering, Y. Zhang, R. Mitchell, M. Mezzadri, P. D'Angelo, L. Agostino, Luigi Moroni, J. M. De Miranda, A. M. Lopez, L. A. Garren, D. Pantea, H. Mendez, J. E. Moore, Gianluca Alimonti, D. Engh, B. R. Ko, A. Kryemadhi, T. F. Davenport, A. C. dos Reis, G. Chiodini, Kyung-Suk Cho, A. Zallo, A. E. Kreymer, S. Erba, C. Göbel, C. Uribe, J. E. Ramirez, R. Kutschke, Paolo Vitulo, G. Boca, Y. S. Chung, I. Segoni, E. Cuautle, Paolo Dini, P. H. Kasper, M. H.L.S. Wang, A. Rahimi, Erica Polycarpo, M. Hosack, E. Casimiro, Germano Bonomi, John Perry Cumalat, Agustín Cobos Cerutti, L. Cinquini, S. Sala, J. W. Kwak, S. P. Ratti, Gabriele Gianini, A. Paris, B. O'Reilly, C. Cawlfield, C. Pontoglio, Kevin Stenson, S. Barberis, Sandra Malvezzi, F. Prelz, Erik Gottschalk, Paul Sheldon, W. E. Johns, A. A. Machado, V. Arena, J. C. Anjos, D. Lopes Pegna, Luigi Benussi, Ignacio Bediaga, M. Sheaff, J. Magnin, Dario Menasce, L. Edera, Iuri Muniz Pepe, James E Wiss, F. Leveraro, Stefano Bianco, Cristina Riccardi, K. B. Lee, Harry Cheung, Daniele Pedrini, I. Gaines, P. Inzani, M. Bertani, J. N. Butler, M. Boschini, P. H. Garbincius, M. DiCorato, A. Sanchez-Hernandez, H. Park, J. S. Kang, J. M. Link, James R. Wilson, G. Liguori, F. Vázquez, F. L. Fabbri, and M. S. Nehring
Subjects: Physics, Nuclear and High Energy Physics, Crystallography, Meson, Branching fraction, Atomic physics
Abstract: Using data from the FOCUS experiment (FNAL-E831), we report on the decay of D 0 mesons into final states containing more than one K S 0 . We present evidence for two Cabibbo favored decay modes, D 0 → K S 0 K S 0 K − π + and D 0 → K S 0 K S 0 K + π − , and measure their combined branching fraction relative to D 0 → K ¯ 0 π + π − to be Γ ( D 0 → K S 0 K S 0 K ± π ∓ ) Γ ( D 0 → K ¯ 0 π + π − ) = 0.0106 ± 0.0019 ± 0.0010 . Further, we report new measurements of Γ ( D 0 → K S 0 K S 0 K S 0 ) Γ ( D 0 → K ¯ 0 π + π − ) = 0.0179 ± 0.0027 ± 0.0026 , Γ ( D 0 → K 0 K ¯ 0 ) Γ ( D 0 → K ¯ 0 π + π − ) = 0.0144 ± 0.0032 ± 0.0016 , and Γ ( D 0 → K S 0 K S 0 π + π − ) Γ ( D 0 → K ¯ 0 π + π − ) = 0.0208 ± 0.0035 ± 0.0021 where the first error is statistical and the second is systematic.
Published: 2005

18. Measurement of the branching ratio of the decay D0→π−μ+ν relative to D0→K−μ+ν

Author: M. Boschini, P. H. Garbincius, M. Sheaff, John Perry Cumalat, L. Cinquini, G. Boca, Germano Bonomi, James E Wiss, F. Leveraro, Marco A. Reyes, J. E. Moore, D. Pantea, P. M. Yager, L. Agostino, F. L. Fabbri, Iuri Muniz Pepe, B. O'Reilly, S. Sala, Erica Polycarpo, Y. Zhang, S. Erba, Kyung-Suk Cho, Luigi Moroni, J. Magnin, Dario Menasce, Eric Wayne Vaandering, Gabriele Gianini, A. Kryemadhi, Stefano Bianco, M. S. Nehring, C. Cawlfield, C. Pontoglio, Cristina Riccardi, P. D'Angelo, Kevin Stenson, E. Luiggi, H. Hernandez, Ignacio Bediaga, A. E. Kreymer, T. Handler, A. Massafferri, Gianluca Alimonti, C. Uribe, J. E. Ramirez, L. A. Garren, S. Barberis, B. R. Ko, Sandra Malvezzi, S. Carrillo, J. W. Kwak, S. P. Ratti, K. B. Lee, V. Arena, A. C. dos Reis, D. Lopes Pegna, Michael S. Webster, R. Mitchell, Erik Gottschalk, J. M. De Miranda, A. A. Machado, T. F. Davenport, Luigi Benussi, Robert Gardner, J. M. Link, Marco Rovere, F. Prelz, H. Mendez, Harry Cheung, M. Mezzadri, D. Engh, James R. Wilson, G. Liguori, A. Zallo, L. Edera, F. Vázquez, M. DiCorato, M. M. Merlo, H. Park, R. Kutschke, G. Chiodini, Y. S. Chung, I. Segoni, E. Cuautle, C. Göbel, Paolo Vitulo, Paul Sheldon, J. Quinones, Paolo Dini, M. Hosack, E. Casimiro, Daniele Pedrini, P. Inzani, J. C. Anjos, J. S. Kang, M. H.L.S. Wang, A. Rahimi, A. Cerutti, W. E. Johns, A. M. Lopez, A. Paris, A. Sanchez-Hernandez, M. Bertani, J. N. Butler, I. Gaines, P. H. Kasper, and D. Y. Kim
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Branching fraction, Form factor (quantum field theory), Analytical chemistry
Abstract: We present a new measurement of the branching ratio of the Cabibbo suppressed decay D 0 → π − μ + ν relative to the Cabibbo favored decay D 0 → K − μ + ν and an improved measurement of the ratio | f + π ( 0 ) / f + K ( 0 ) | . Our results are 0.074 ± 0.008 ± 0.007 for the branching ratio and 0.85 ± 0.04 ± 0.04 ± 0.01 for the form factor ratio, respectively.
Published: 2005

19. Measurements of the q2 dependence of the D0→K−μ+ν and D0→π−μ+ν form factors

Author: V. Arena, D. Lopes Pegna, Luigi Benussi, M. Mezzadri, J. E. Moore, A. E. Kreymer, S. Barberis, D. Y. Kim, A. Paris, G. Boca, R. Mitchell, Gabriele Gianini, C. Uribe, J. E. Ramirez, L. Edera, James E Wiss, S. Erba, F. Leveraro, Germano Bonomi, C. Pontoglio, Daniele Pedrini, John Perry Cumalat, M. M. Merlo, Stefano Bianco, Kevin Stenson, Paul Sheldon, B. O'Reilly, M. Sheaff, M. H.L.S. Wang, A. Rahimi, A. Cerutti, P. Inzani, L. Cinquini, Y. Zhang, S. Carrillo, L. Agostino, James R. Wilson, P. D'Angelo, G. Liguori, Cristina Riccardi, Luigi Moroni, J. Magnin, M. Boschini, H. Mendez, P. H. Garbincius, D. Pantea, Sandra Malvezzi, Dario Menasce, J. M. De Miranda, A. M. Lopez, A. Kryemadhi, F. Vázquez, T. F. Davenport, F. L. Fabbri, A. Sanchez-Hernandez, J. S. Kang, Marco A. Reyes, J. C. Anjos, F. Prelz, A. C. dos Reis, J. M. Link, M. S. Nehring, P. M. Yager, I. Segoni, E. Cuautle, Michael S. Webster, R. Kutschke, S. Sala, Robert Gardner, K. B. Lee, P. H. Kasper, Marco Rovere, Y. S. Chung, A. Zallo, Iuri Muniz Pepe, M. Bertani, T. Handler, Ignacio Bediaga, Harry Cheung, Paolo Dini, M. Hosack, A. Massafferri, E. Casimiro, E. Luiggi, H. Hernandez, J. N. Butler, Gianluca Alimonti, I. Gaines, B. R. Ko, J. Quinones, W. E. Johns, M. DiCorato, C. Cawlfield, H. Park, Eric Wayne Vaandering, L. A. Garren, Kyung-Suk Cho, D. Engh, Erik Gottschalk, J. W. Kwak, S. P. Ratti, A. A. Machado, G. Chiodini, C. Göbel, Paolo Vitulo, and Erica Polycarpo
Subjects: Physics, Nuclear and High Energy Physics, Form factor (quantum field theory), Lattice QCD, Atomic physics, Large sample
Abstract: Using a large sample of D 0 → K − μ + ν and D 0 → π − μ + ν decays collected by the FOCUS photoproduction experiment at Fermilab, we present new measurements of the q 2 dependence for the f + ( q 2 ) form factor. These measured f + ( q 2 ) form factors are fit to common parameterizations such as the pole dominance form and compared to recent unquenched Lattice QCD calculations. We find m pole = 1.93 ± 0.05 ± 0.03 GeV / c 2 for D 0 → K − μ + ν and m pole = 1.91 −0.15 +0.30 ± 0.07 GeV / c 2 for D 0 → π − μ + ν and f − ( K ) ( 0 ) / f + ( K ) ( 0 ) = − 1.7 −1.4 +1.5 ± 0.3 .
Published: 2005

20. Hepatopulmonary syndrome

Author: David I, Gaines and Michael B, Fallon
Subjects: Hepatology, Humans, Hepatopulmonary Syndrome
Abstract: The hepatopulmonary syndrom occurs when pulmonary microvacular dilatation causes hypoxemia in cirrhosis. It is found in between 15-20% of patients with chronic liver diseases and should be considered in the differential diagnosis of dyspnea or abnormal arterial oxygenation in this group. The presence of HPS appears to significantly increase mortality in affected patients with cirrhosis. The mediators of intrapulmonary vasodilatation and HPS are not fully characterized although pulmonary nitric oxide overproduction appears to be a key event in human and experimental models. Contrast echocardiography is the best screening test for pulmonary vasodilatation. Currently there are no effective medical therapies for HPS, although liver transplantation results in reversal of HPS in most cases. However, mortality is higher in patients with HPS undergoing transplantation relative to those without HPS.
Published: 2004

21. Measurement of the ratio of the vector to pseudoscalar charm semileptonic decay rate Γ(D+→K¯*0μ+νμ)/Γ(D+→K¯0μ+νμ)

Author: Marco A. Reyes, Paolo Dini, Luigi Moroni, Michael Wang, M. Hosack, E. Casimiro, L. Edera, P. M. Yager, A. C. dos Reis, Gabriele Gianini, S. Sala, Paul Sheldon, A. M. Lopez, I. Gaines, P. H. Kasper, D. Pantea, M. DiCorato, J. C. Anjos, James E Wiss, F. Leveraro, S. Carrillo, M. Boschini, C. Pontoglio, P. H. Garbincius, J. M. De Miranda, A. D. Bryant, D. Engh, T. F. Davenport, Michael S. Webster, S. Barberis, Kevin Stenson, Kyung-Suk Cho, L. Bertani, Robert Gardner, Daniele Pedrini, James R. Wilson, A. Sanchez-Hernandez, K. B. Lee, A. Rahimi, A. Cerutti, G. Liguori, John Perry Cumalat, Marco Giammarchi, Sandra Malvezzi, L. Cinquini, P. Inzani, R. Mitchell, A. Paris, D. Y. Kim, Gianluca Alimonti, F. Vázquez, F. Prelz, Harry Cheung, I. Segoni, E. Cuautle, A. Zallo, W. E. Johns, J. S. Kang, S. Erba, E. Luiggi, H. Hernandez, H. Mendez, A. E. Kreymer, C. Uribe, J. E. Ramirez, Stefano Bianco, J. N. Butler, M. Sheaff, Cristina Riccardi, M. Mezzadri, J. M. Link, Iuri Muniz Pepe, F. L. Fabbri, Erik Gottschalk, Eric Wayne Vaandering, B. R. Ko, A. A. Machado, M. S. Nehring, L. A. Garren, C. Cawlfield, T. Handler, A. Massafferri, J. Magnin, Dario Menasce, V. Arena, D. Lopes Pegna, G. Chiodini, Luigi Benussi, C. Göbel, H. Park, Paolo Vitulo, G. Boca, Marco Rovere, Erica Polycarpo, Germano Bonomi, J. W. Kwak, S. P. Ratti, B. O'Reilly, Y. Zhang, P. D'Angelo, J. Quinones, I. Bediaga, M. M. Merlo, L. Agostino, A. Kryemadhi, R. Kutschke, and Y. S. Chung
Subjects: Physics, Nuclear physics, Hadronic decay, Pseudoscalar, Semileptonic decay, Nuclear and High Energy Physics, Branching fraction, Analytical chemistry, Particle Data Group
Abstract: Using a high statistics sample of photo-produced charm particles from the FOCUS experiment at Fermilab, we report on the measurement of the ratio of semileptonic rates Γ ( D + → K π μ + ν μ ) / Γ ( D + → K ¯ 0 μ + ν μ ) = 0.625 ± 0.045 ± 0.034 . Allowing for the Kπ S-wave interference measured in [J.M. Link, et al., FOCUS Collaboration, Phys. Lett. B 544 (2002) 89], we extract the vector to pseudoscalar ratio Γ ( D + → K ¯ * 0 μ + ν μ ) / Γ ( D + → K ¯ 0 μ + ν μ ) = 0.594 ± 0.043 ± 0.033 and the ratio Γ ( D + → K ¯ 0 μ + ν μ ) / Γ ( D + → K − π + π + ) = 1.019 ± 0.076 ± 0.065 . Our results show a lower ratio for Γ ( D → K * l ν ) / Γ ( D → K l ν ) than has been reported recently and indicate the current world average branching fractions for the decays D + → K ¯ 0 ( μ + , e + ) ν μ , e are low. Using the world average B ( D + → K − π + π + ) [K. Hagiwara, et al., Particle Data Group Collaboration, Phys. Rev. D 66 (2002) 010001, and 2003 partial update for edition 2004 ( http://pdg.lbl.gov )] we extract B ( D + → K ¯ 0 μ + ν ) = ( 9.27 ± 0.69 ± 0.59 ± 0.61 ) % .
Published: 2004

22. Measurement of masses and widths of excited charm mesons D and evidence for broad states

Author: J.M. Link, P.M. Yager, J.C. Anjos, I. Bediaga, C. Göbel, A.A. Machado, J. Magnin, A. Massafferri, J.M. de Miranda, I.M. Pepe, E. Polycarpo, A.C. dos Reis, S. Carrillo, E. Casimiro, E. Cuautle, A. Sánchez-Hernández, C. Uribe, F. Vázquez, L. Agostino, L. Cinquini, J.P. Cumalat, B. O'Reilly, I. Segoni, M. Wahl, J.N. Butler, H.W.K. Cheung, G. Chiodini, I. Gaines, P.H. Garbincius, L.A. Garren, E. Gottschalk, P.H. Kasper, A.E. Kreymer, R. Kutschke, M. Wang, L. Benussi, M. Bertani, S. Bianco, F.L. Fabbri, A. Zallo, M. Reyes, C. Cawlfield, D.Y. Kim, A. Rahimi, J. Wiss, R. Gardner, A. Kryemadhi, Y.S. Chung, J.S. Kang, B.R. Ko, J.W. Kwak, K.B. Lee, K. Cho, H. Park, G. Alimonti, S. Barberis, M. Boschini, A. Cerutti, P. D'Angelo, M. DiCorato, P. Dini, L. Edera, S. Erba, M. Giammarchi, P. Inzani, F. Leveraro, S. Malvezzi, D. Menasce, M. Mezzadri, L. Moroni, D. Pedrini, C. Pontoglio, F. Prelz, M. Rovere, S. Sala, T.F. Davenport, V. Arena, G. Boca, G. Bonomi, G. Gianini, G. Liguori, M.M. Merlo, D. Pantea, D. Lopes Pegna, S.P. Ratti, C. Riccardi, P. Vitulo, H. Hernandez, A.M. Lopez, E. Luiggi, H. Mendez, A. Paris, J.E. Ramirez, Y. Zhang, J.R. Wilson, T. Handler, R. Mitchell, D. Engh, M. Hosack, W.E. Johns, M. Nehring, P.D. Sheldon, K. Stenson, E.W. Vaandering, M. Webster, and M. Sheaff
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Meson, Excited state, Resonance, Invariant mass, Charm (quantum number), State (functional analysis), Atomic physics
Abstract: Using data from the FOCUS experiment we analyze the D+π− and D0π+ invariant mass distributions. We measure the D 2 ∗0 mass M D 2 ∗0 =(2464.5±1.1±1.9) MeV /c 2 and width Γ D 2 ∗0 =(38.7±5.3±2.9) MeV /c 2 , and the D 2 ∗+ mass M D 2 ∗+ =(2467.6±1.5±0.76) MeV /c 2 and width Γ D 2 ∗+ =(34.1±6.5±4.2) MeV /c 2 . We find evidence for broad structures over background in both the neutral and charged final state. If each is interpreted as evidence for a single L=1, jq=1/2 excited charm meson resonance, the masses and widths are M 1/2 0 =(2407±21±35) MeV /c 2 , Γ 1/2 0 =(240±55±59) MeV /c 2 , and M 1/2 + =(2403±14±35) MeV /c 2 , Γ 1/2 + =(283±24±34) MeV /c 2 , respectively.
Published: 2004

23. New measurements of the D+→φμ+ν form factor ratios

Author: J.M. Link, P.M. Yager, J.C. Anjos, I. Bediaga, C. Göbel, A.A. Machado, J. Magnin, A. Massafferri, J.M. de Miranda, I.M. Pepe, E. Polycarpo, A.C. dos Reis, S. Carrillo, E. Casimiro, E. Cuautle, A. Sánchez-Hernández, C. Uribe, F. Vázquez, L. Agostino, L. Cinquini, J.P. Cumalat, J. Jacobs, B. O'Reilly, I. Segoni, K. Stenson, J.N. Butler, H.W.K. Cheung, G. Chiodini, I. Gaines, P.H. Garbincius, L.A. Garren, E. Gottschalk, P.H. Kasper, A.E. Kreymer, R. Kutschke, M. Wang, L. Benussi, M. Bertani, S. Bianco, F.L. Fabbri, A. Zallo, M. Reyes, C. Cawlfield, D.Y. Kim, A. Rahimi, J. Wiss, R. Gardner, Y.S. Chung, J.S. Kang, B.R. Ko, J.W. Kwak, K.B. Lee, K. Cho, H. Park, G. Alimonti, S. Barberis, M. Boschini, A. Cerutti, P. D'Angelo, M. DiCorato, P. Dini, L. Edera, S. Erba, M. Giammarchi, P. Inzani, F. Leveraro, S. Malvezzi, D. Menasce, M. Mezzadri, L. Moroni, D. Pedrini, C. Pontoglio, F. Prelz, M. Rovere, S. Sala, T.F. Davenport, V. Arena, G. Boca, G. Bonomi, G. Gianini, G. Liguori, M.M. Merlo, D. Pantea, D. Lopes Pegna, S.P. Ratti, C. Riccardi, P. Vitulo, H. Hernandez, A.M. Lopez, H. Mendez, A. Paris, J.E. Ramirez, Y. Zhang, J.R. Wilson, T. Handler, R. Mitchell, D. Engh, M. Hosack, W.E. Johns, E. Luiggi, M. Nehring, P.D. Sheldon, E.W. Vaandering, M. Webster, and M. Sheaff
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Analytical chemistry, Form factor (quantum field theory), Large sample
Abstract: Using a large sample of D s + → φμ + ν decays collected by the FOCUS photoproduction experiment at Fermilab, we present new measurements of two semileptonic form factor ratios: r v and r 2 . We find r v =1.549±0.250±0.148 and r 2 =0.713±0.202±0.284. These values are consistent with r v and r 2 form factors measured for the process D + → K ∗0 l + ν l .
Published: 2004

24. Charm–anticharm baryon production asymmetries in photon–nucleon interactions

Author: J.M Link, P.M Yager, J.C Anjos, I Bediaga, C Göbel, A.A Machado, J Magnin, A Massafferri, J.M de Miranda, I.M Pepe, E Polycarpo, A.C dos Reis, S Carrillo, E Casimiro, E Cuautle, A Sánchez-Hernández, F Vázquez, C Uribe, L Agostino, L Cinquini, J.P Cumalat, B O'Reilly, I Segoni, M Wahl, J.N Butler, H.W.K Cheung, G Chiodini, I Gaines, P.H Garbincius, L.A Garren, E Gottschalk, P.H Kasper, A.E Kreymer, R Kutschke, M Wang, L Benussi, M Bertani, S Bianco, F.L Fabbri, A Zallo, M Reyes, C Cawlfield, D.Y Kim, A Rahimi, J Wiss, R Gardner, A Kryemadhi, Y.S Chung, J.S Kang, B.R Ko, J.W Kwak, K.B Lee, K Cho, H Park, G Alimonti, S Barberis, M Boschini, A Cerutti, P D'Angelo, M DiCorato, P Dini, L Edera, S Erba, M Giammarchi, P Inzani, F Leveraro, S Malvezzi, D Menasce, M Mezzadri, L Moroni, D Pedrini, C Pontoglio, F Prelz, M Rovere, S Sala, T.F Davenport, V Arena, G Boca, G Bonomi, G Gianini, G Liguori, M.M Merlo, D Pantea, D Lopes Pegna, S.P Ratti, C Riccardi, P Vitulo, H Hernandez, A.M Lopez, E Luiggi, H Mendez, A Paris, J.E Ramirez, Y Zhang, J.R Wilson, T Handler, R Mitchell, D Engh, M Hosack, W.E Johns, M Nehring, P.D Sheldon, K Stenson, E.W Vaandering, M Webster, and M Sheaff
Subjects: Physics, Particle physics, Nuclear and High Energy Physics, Photon, media_common.quotation_subject, FOS: Physical sciences, Asymmetry, High Energy Physics - Experiment, Baryon, High Energy Physics - Experiment (hep-ex), Excited state, Production (computer science), Charm (quantum number), Fermilab, Nucleon, media_common
Abstract: We report measurements of the charm-anticharm production asymmetries for $\Lambda_c^+$, $\Sigma_c^{++}$, $\Sigma_c^0$, $\Sigma_c^{++*}$, $\Sigma_c^{0*}$, and $\Lambda_c^+(2625)$ baryons from the Fermilab photoproduction experiment FOCUS (E831). These asymmetries are integrated over the region where the spectrometer has good acceptance. In addition, we have obtained results for the photoproduction asymmetries of the $\Lambda_c$ baryons as functions of $p_L$, $p_T^2$, and $x_F$. The integrated asymmetry for $\Lambda_c^+$ production, $(\sigma_{\Lambda_c^+} - \sigma_{\Lambda_c^-}) / (\sigma_{\Lambda_c^+} + \sigma_{\Lambda_c^-})$, is $0.111 \pm 0.018 \pm 0.012$, significantly different from zero. The asymmetries of the excited states are consistent with the $\Lambda_c$ asymmetry., Comment: 12 pages, 9 figures, 1 table
Published: 2004
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25. Studies of correlations between D and D mesons in high energy photoproduction

Author: J.M. Link, P.M. Yager, J.C. Anjos, I. Bediaga, C. Göbel, J. Magnin, A. Massafferri, J.M. de Miranda, I.M. Pepe, E. Polycarpo, A.C. dos Reis, S. Carrillo, E. Casimiro, E. Cuautle, A. Sánchez-Hernández, C. Uribe, F. Vázquez, L. Agostino, L. Cinquini, J.P. Cumalat, B. O'Reilly, I. Segoni, M. Wahl, J.N. Butler, H.W.K. Cheung, G. Chiodini, I. Gaines, P.H. Garbincius, L.A. Garren, E.E. Gottschalk, P.H. Kasper, A.E. Kreymer, R. Kutschke, M. Wang, L. Benussi, M. Bertani, S. Bianco, F.L. Fabbri, A. Zallo, M. Reyes, C. Cawlfield, D.Y. Kim, A. Rahimi, J. Wiss, R. Gardner, A. Kryemadhi, Y.S. Chung, J.S. Kang, B.R. Ko, J.W. Kwak, K.B. Lee, K. Cho, H. Park, G. Alimonti, S. Barberis, M. Boschini, A. Cerutti, P. D'Angelo, M. DiCorato, P. Dini, L. Edera, S. Erba, M. Giammarchi, P. Inzani, F. Leveraro, S. Malvezzi, D. Menasce, M. Mezzadri, L. Moroni, D. Pedrini, C. Pontoglio, F. Prelz, M. Rovere, S. Sala, T.F. Davenport, V. Arena, G. Boca, G. Bonomi, G. Gianini, G. Liguori, D. Lopes Pegna, M.M. Merlo, D. Pantea, S.P. Ratti, C. Riccardi, P. Vitulo, H. Hernandez, A.M. Lopez, E. Luiggi, H. Mendez, A. Paris, J. Quinones, J.E. Ramirez, Y. Zhang, J.R. Wilson, T. Handler, R. Mitchell, D. Engh, M. Hosack, W.E. Johns, M. Nehring, P.D. Sheldon, K. Stenson, E.W. Vaandering, M. Webster, and M. Sheaff
Subjects: Quark, Physics, High energy, Particle physics, Nuclear and High Energy Physics, Meson, Bar (music), Nuclear Theory, High Energy Physics::Phenomenology, FOS: Physical sciences, Large sample, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Production (computer science), High Energy Physics::Experiment, Fermilab, Charm (quantum number), Nuclear Experiment
Abstract: Studies of $D{\bar D}$ correlations for a large sample of events containing fully and partially reconstructed pairs of charmed $D$ mesons recorded by the Fermilab photoproduction experiment FOCUS (FNAL-E831) are presented. Correlations between $D$ and ${\bar D}$ mesons are used to study heavy quark production dynamics. We present results for fully and partially reconstructed charm pairs and comparisons to a recent version of \textsc{Pythia} with default parameter settings. We also comment on the production of $\psi(3770)$ in our data., Comment: 14 pages, 4 figures
Published: 2003
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26. Measurement of the Ωc0 lifetime

Author: J.M Link, M Reyes, P.M Yager, J.C Anjos, I Bediaga, C Göbel, J Magnin, A Massafferri, J.M de Miranda, I.M Pepe, A.C dos Reis, S Carrillo, E Casimiro, E Cuautle, A Sánchez-Hernández, C Uribe, F Vázquez, L Agostino, L Cinquini, J.P Cumalat, B O'Reilly, J.E Ramirez, I Segoni, M Wahl, J.N Butler, H.W.K Cheung, G Chiodini, I Gaines, P.H Garbincius, L.A Garren, E Gottschalk, P.H Kasper, A.E Kreymer, R Kutschke, L Benussi, S Bianco, F.L Fabbri, A Zallo, C Cawlfield, D.Y Kim, A Rahimi, J Wiss, R Gardner, A Kryemadhi, C.H Chang, Y.S Chung, J.S Kang, B.R Ko, J.W Kwak, K.B Lee, K Cho, H Park, G Alimonti, S Barberis, M Boschini, A Cerutti, P D'Angelo, M DiCorato, P Dini, L Edera, S Erba, M Giammarchi, P Inzani, F Leveraro, S Malvezzi, D Menasce, M Mezzadri, L Moroni, D Pedrini, C Pontoglio, F Prelz, M Rovere, S Sala, T.F Davenport, V Arena, G Boca, G Bonomi, G Gianini, G Liguori, M.M Merlo, D Pantea, D Lopes Pegna, S.P Ratti, C Riccardi, P Vitulo, H Hernandez, A.M Lopez, E Luiggi, H Mendez, A Paris, J Quinones, W Xiong, Y Zhang, J.R Wilson, T Handler, R Mitchell, D Engh, M Hosack, W.E Johns, M Nehring, P.D Sheldon, K Stenson, E.W Vaandering, M Webster, and M Sheaff
Subjects: Physics, Baryon, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences, Omega
Abstract: The FOCUS experiment(FNAL-E831) has used two channels, $\Omega^- \pi^+$ and $\Xi^-K^- \pi^+ \pi^+$,to measure the lifetime of the $\Omega_c^0$ charmed baryon. From a sample of $64 \pm 14$ signal events at a mass of 2.698 GeV/$c^2$, we measure an $\Omega_c^0$ lifetime of $72 \pm 11$ (stat.) $\pm 11$ (sys.) fs, substantially improving upon the current world average.
Published: 2003

27. New measurements of the D→μν form factor ratios

Author: D. Y. Kim, D. Engh, I. Segoni, E. Cuautle, Erik Gottschalk, S. Carrillo, Marco A. Reyes, J. M. De Miranda, J. S. Kang, T. F. Davenport, Luigi Benussi, A. Paris, R. Kutschke, M. DiCorato, Luigi Moroni, H. Mendez, Y. Zhang, S. Sala, Y. S. Chung, Daniele Pedrini, S. Erba, Kyung-Suk Cho, J. Magnin, M. Boschini, A. C. dos Reis, John Perry Cumalat, A. Rahimi, A. Cerutti, Marco Giammarchi, Dario Menasce, A. Zallo, W. E. Johns, P. Inzani, P. H. Garbincius, L. Agostino, L. Cinquini, Sandra Malvezzi, L. Edera, P. M. Yager, H. Hernandez, Harry Cheung, A. Kryemadhi, F. Prelz, A. M. Lopez, Germano Bonomi, Gianluca Alimonti, Paolo Dini, A. Sanchez-Hernandez, G. Boca, A. E. Kreymer, V. Arena, J. E. Ramirez, K. H. Chang, Paul Sheldon, C. Uribe, G. Chiodini, J. M. Link, James E Wiss, K. B. Lee, M. Hosack, E. Casimiro, Gabriele Gianini, K. S. Park, F. Leveraro, B. O'Reilly, B. R. Ko, C. Göbel, Stefano Bianco, C. Pontoglio, Paolo Vitulo, S. Barberis, M. Sheaff, J. Quinones, Michael S. Webster, Cristina Riccardi, M. M. Merlo, James R. Wilson, G. Liguori, Kevin Stenson, M. Mezzadri, J. N. Butler, J. C. Anjos, Robert Gardner, D. Pantea, Marco Rovere, W. Xiong, H. K. Park, Iuri Muniz Pepe, F. Vázquez, I. Gaines, P. H. Kasper, P. D'Angelo, J. W. Kwak, S. P. Ratti, M. S. Nehring, Fabrizio Fabbri, I. Bediaga, C. Cawlfield, Eric Wayne Vaandering, L. A. Garren, R. Mitchell, T. Handler, and A. Massafferri
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Form factor (quantum field theory), Fermilab, Focus (optics), Large sample
Abstract: Using a large sample of D + → K − π + μ + ν decays collected by the FOCUS photoproduction experiment at Fermilab, we present new measurements of two semileptonic form factor ratios: r v and r 2 . We find r v =1.504±0.057±0.039 and r 2 =0.875±0.049±0.064. Our form factor results include the effects of the s -wave interference discussed in Phys. Lett. B 535 (2002) 43.
Published: 2002

28. New measurements of the and branching ratios

Author: I. Gaines, J. Magnin, Dario Menasce, J. S. Kang, Kyung-Suk Cho, C. Cawlfield, S. Carrillo, J. C. Anjos, Germano Bonomi, Stefano Bianco, Sandra Malvezzi, Cristina Riccardi, W. Xiong, A. M. Lopez, K. B. Lee, J. M. De Miranda, T. F. Davenport, Harry Cheung, John Perry Cumalat, Paolo Dini, Marco Giammarchi, M. Hosack, E. Casimiro, J. W. Kwak, S. P. Ratti, F. Prelz, J. N. Butler, L. Cinquini, James E Wiss, Daniele Pedrini, D. Pantea, F. Leveraro, H. Mendez, Agustín Cobos Cerutti, K. H. Chang, D. Engh, M. Boschini, P. H. Garbincius, D. Y. Kim, B. O'Reilly, B. R. Ko, A. Sanchez-Hernandez, P. Inzani, Y. Zhang, J. Quinones, V. Arena, A. E. Kreymer, Luigi Benussi, L. Edera, A. Paris, S. Barberis, Luigi Moroni, P. M. Yager, C. Uribe, J. E. Ramirez, Paul Sheldon, J. M. Link, M. DiCorato, W. E. Johns, I. Segoni, A. C. dos Reis, E. Cuautle, F. L. Fabbri, Michael S. Webster, P. H. Kasper, H. Park, Robert Gardner, Marco Rovere, M. S. Nehring, James R. Wilson, G. Liguori, F. Vázquez, R. Kutschke, A. Rahimi, Eric Wayne Vaandering, Y. S. Chung, P. D'Angelo, A. Zallo, M. Sheaff, L. A. Garren, T. Handler, H. Hernandez, A. Massafferri, Iuri Muniz Pepe, M. M. Merlo, L. Agostino, R. Mitchell, A. Kryemadhi, Gabriele Gianini, K. S. Park, C. Pontoglio, Kevin Stenson, Erik Gottschalk, S. Erba, Gianluca Alimonti, G. Chiodini, C. Göbel, Paolo Vitulo, G. Boca, S. Sala, Ignacio Bediaga, M. Mezzadri, and Marco A. Reyes
Subjects: Physics, Nuclear and High Energy Physics, Nuclear magnetic resonance, Analytical chemistry, Large sample
Abstract: Using a large sample of charm semileptonic decays collected by the FOCUS photoproduction experiment at Fermilab, we present new measurements of two semileptonic branching ratios. We obtain values of Γ(D + → K ∗0 μ + ν) Γ(D + →K − π + π + ) =0.602±0.010( stat )±0.021( sys ) and Γ(D s + →φμ + ν) Γ(D s + →φπ + ) =0.54±0.033( stat )±0.048( sys ) . Our D + → K ∗0 μ + ν result includes the effects of the s-wave interference discussed in Phys. Lett. B 535 (2002) 43.
Published: 2002

29. A new measurement of the Ξ0 lifetime

Author: J.M Link, M Reyes, P.M Yager, J.C Anjos, I Bediaga, C Göbel, J Magnin, A Massafferri, J.M de Miranda, I.M Pepe, A. C dos Reis, S Carrillo, E Casimiro, E Cuautle, A Sánchez-Hernández, C Uribe, F Vázquez, L Agostino, L Cinquini, J.P Cumalat, B O'Reilly, J.E Ramirez, I Segoni, J.N Butler, H.W.K Cheung, G Chiodini, I Gaines, P.H Garbincius, L.A Garren, E Gottschalk, P.H Kasper, A.E Kreymer, R Kutschke, L Benussi, S Bianco, F.L Fabbri, A Zallo, C Cawlfield, D.Y Kim, K.S Park, A Rahimi, J Wiss, R Gardner, A Kryemadhi, K.H Chang, Y.S Chung, J.S Kang, B.R Ko, J.W Kwak, K.B Lee, K Cho, H Park, G Alimonti, S Barberis, A Cerutti, M Boschini, P D'Angelo, M DiCorato, P Dini, L Edera, S Erba, M Giammarchi, P Inzani, F Leveraro, S Malvezzi, D Menasce, M Mezzadri, L Moroni, D Pedrini, C Pontoglio, F Prelz, M Rovere, S Sala, T.F Davenport, V Arena, G Boca, G Bonomi, G Gianini, G Liguori, M.M Merlo, D Pantea, S.P Ratti, C Riccardi, P Vitulo, H Hernandez, A.M Lopez, H Mendez, L Mendez, E Montiel, D Olaya, A Paris, J Quinones, C Rivera, W Xiong, Y Zhang, J.R Wilson, T Handler, R Mitchell, D Engh, M Hosack, W.E Johns, M Nehring, P.D Sheldon, K Stenson, E.W Vaandering, M Webster, and M Sheaff
Subjects: Physics, Baryon, Nuclear and High Energy Physics, Crystallography, Particle physics, Omega, High Energy Physics - Experiment
Abstract: Using data collected by the Fermilab experiment FOCUS, we measure the lifetime of the charmed baryon (\Xi_{c}^{o}) using the decay channels (\Xi_{c}^{o}\to \Xi ^{-}\pi ^{+}) and (\Xi_{c}^{o}\to \Omega ^{-}K^{+}). From a combined sample of (110\pm 17) events we find (\tau (\Xi_{c}^{o}) =~118^{+ 14}_{- 12} \pm5) fs, where the first and second errors are statistical and systematic, respectively., Comment: 13 pages, 5 figures
Published: 2002

30. Measurements of relative branching ratios of Λ+ decays into states containing Σ

Author: J.M. Link, M. Reyes, P.M. Yager, J.C. Anjos, I. Bediaga, C. Göbel, J. Magnin, A. Massafferri, J.M. de Miranda, I.M. Pepe, A.C. dos Reis, S. Carrillo, E. Casimiro, E. Cuautle, A. Sánchez-Hernández, C. Uribe, F. Vázquez, L. Agostino, L. Cinquini, J.P. Cumalat, B. O'Reilly, J.E. Ramirez, I. Segoni, J.N. Butler, H.W.K. Cheung, G. Chiodini, I. Gaines, P.H. Garbincius, L.A. Garren, E. Gottschalk, P.H. Kasper, A.E. Kreymer, R. Kutschke, L. Benussi, S. Bianco, F.L. Fabbri, A. Zallo, C. Cawlfield, D.Y. Kim, K.S. Park, A. Rahimi, J. Wiss, R. Gardner, A. Kryemadhi, K.H. Chang, Y.S. Chung, J.S. Kang, B.R. Ko, J.W. Kwak, K.B. Lee, K. Cho, H. Park, G. Alimonti, S. Barberis, A. Cerutti, M. Boschini, P. D'Angelo, M. DiCorato, P. Dini, L. Edera, S. Erba, M. Giammarchi, P. Inzani, F. Leveraro, S. Malvezzi, D. Menasce, M. Mezzadri, L. Moroni, D. Pedrini, C. Pontoglio, F. Prelz, M. Rovere, S. Sala, T.F. Davenport, V. Arena, G. Boca, G. Bonomi, G. Gianini, G. Liguori, M.M. Merlo, D. Pantea, S.P. Ratti, C. Riccardi, P. Vitulo, H. Hernandez, A.M. Lopez, H. Mendez, L. Mendez, E. Montiel, D. Olaya, A. Paris, J. Quinones, C. Rivera, W. Xiong, Y. Zhang, J.R. Wilson, T. Handler, R. Mitchell, D. Engh, M. Hosack, W.E. Johns, M. Nehring, P.D. Sheldon, K. Stenson, E.W. Vaandering, M. Webster, and M. Sheaff
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Crystallography, High Energy Physics::Phenomenology, Sigma, High Energy Physics::Experiment, Astrophysics::Cosmology and Extragalactic Astrophysics, Branching (polymer chemistry), Lambda, Astrophysics::Galaxy Astrophysics
Abstract: We have studied the Cabibbo suppressed decay (\Lambda_{c}^{+}\to \Sigma ^{+}K^{*0}(892)) and the Cabibbo favored decays (\Lambda_{c}^{+}\to \Sigma ^{+}K^{+}K^{-}), (\Lambda_{c}^{+}\to \Sigma ^{+}\phi) and (\Lambda_{c}^{+}\to \Xi ^{*0}(\Sigma^{+}K^{-})K^{+}) and measured their branching ratios relative to (\Lambda_{c}^{+}\to \Sigma ^{+}\pi ^{+}\pi ^{-}) to be ((7.8\pm 1.8\pm 1.3)%), ((7.1\pm 1.1\pm 1.1)%), ((8.7\pm 1.6\pm 0.6)%) and ((2.2\pm 0.6\pm 0.6)%), respectively. The first error is statistical and the second is systematic. We also report two 90% confidence level limits (\Gamma (\Lambda_{c}^{+}\to \Sigma ^{-}K^{+}\pi ^{+})/\Gamma (\Lambda_{c}^{+}\to \Sigma^{+}K^{*0}(892))
Published: 2002

31. Evidence for new interference phenomena in the decay D+→K−π+μ+ν

Author: A. E. Kreymer, C. Uribe, D. Engh, W. Xiong, V. Arena, R. Mitchell, M. Boschini, Eric Wayne Vaandering, Luigi Benussi, D. Pantea, P. H. Garbincius, A. Sanchez-Hernandez, K. B. Lee, S. Erba, G. Chiodini, S. Sala, L. A. Garren, R. Kutschke, Sandra Malvezzi, J. M. Link, J. W. Kwak, S. P. Ratti, M. Mezzadri, Gianluca Alimonti, B. R. Ko, P. D'Angelo, Y. S. Chung, H. Mendez, C. Göbel, J. Quinones, Harry Cheung, Paolo Vitulo, C. Cawlfield, F. Prelz, Erik Gottschalk, Kyung-Suk Cho, J. Magnin, Dario Menasce, G. Boca, H. Hernandez, I. Segoni, Paolo Dini, Stefano Bianco, I. Gaines, E. Cuautle, S. Carrillo, T. Handler, A. Massafferri, Cristina Riccardi, C. Rivera, P. H. Kasper, M. Hosack, E. Casimiro, Marco Giammarchi, I. Bediaga, M. Sheaff, D. Y. Kim, M. DiCorato, L. Milazzo, Germano Bonomi, M. M. Merlo, Gabriele Gianini, H. K. Park, Y. Zhang, P. M. Yager, James E Wiss, F. Leveraro, J. M. De Miranda, T. F. Davenport, J. N. Butler, C. Pontoglio, B. O'Reilly, A. M. Lopez, Iuri Muniz Pepe, Kevin Stenson, E. Montiel, L. Agostino, A. Kryemadhi, D. Olaya, L. Edera, A. Rahimi, J. E. Ramirez, James R. Wilson, G. Liguori, A. Zallo, F. Vázquez, F. L. Fabbri, Paul Sheldon, M. S. Nehring, Daniele Pedrini, S. Barberis, P. Inzani, W. E. Johns, Marco A. Reyes, L. Mendez, J. C. Anjos, John Perry Cumalat, J. S. Kang, L. Cinquini, A. Paris, Michael S. Webster, Robert Gardner, Marco Rovere, Luigi Moroni, and A. C. dos Reis
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Amplitude, Pion, Mass distribution, Resonance, High Energy Physics::Experiment, Charm (quantum number), Fermilab, Interference (wave propagation), Spin-½
Abstract: Using a large sample of charm semileptonic decays collected by the FOCUS photoproduction experiment at Fermilab, we present evidence for a small, even spin K−π+ amplitude that interferes with the dominant K ∗0 component in the D+→K−π+μ+ν final state. Although this interference significantly distorts the D+→K−π+μ+ν decay angular distributions, the new amplitude creates only a very small distortion to the observed kaon pion mass distribution when integrated over the other kinematic variables describing the decay. Our data can be described by K ∗0 interference with either a constant amplitude or broad spin zero resonance.
Published: 2002

32. Measurement of natural widths of Σ0 and Σ++ baryons

Author: Y. Zhang, V. Arena, L. A. Garren, E. Montiel, Michael S. Webster, Robert Gardner, W. Xiong, Marco Rovere, D. Olaya, J. W. Kwak, S. P. Ratti, L. Méndez, D. Engh, B. R. Ko, Paolo Dini, M. Hosack, E. Casimiro, S. Erba, G. Boca, Luigi Moroni, Sandra Malvezzi, James E Wiss, F. Leveraro, Paul Sheldon, D. Pantea, A. C. dos Reis, Germano Bonomi, F. Prelz, R. Mitchell, Hyangkyu Park, M. DiCorato, L. Milazzo, Gianluca Alimonti, S. Sala, J. Magnin, Dario Menasce, B. O'Reilly, J. M. Link, Erik Gottschalk, P. M. Yager, A. E. Kreymer, Stefano Bianco, K. Cho, C. Uribe, C. Rivera, Cristina Riccardi, W. E. Johns, James R. Wilson, M. M. Merlo, G. Liguori, P. D'Angelo, S. Barberis, D. Y. Kim, Daniele Pedrini, K. B. Lee, F. Vázquez, Harry Cheung, P. Inzani, R. Kutschke, F. L. Fabbri, J. C. Anjos, Y. S. Chung, J. S. Kang, M. S. Nehring, H. Hernandez, John Perry Cumalat, Gabriele Gianini, C. Cawlfield, L. Agostino, L. Cinquini, A. Kryemadhi, A. Zallo, C. Pontoglio, Kevin Stenson, I. Gaines, Marco A. Reyes, M. Boschini, J. Quinones, P. H. Garbincius, Ignacio Bediaga, S. Carrillo, M. Sheaff, A. Sanchez-Hernandez, G. Chiodini, T. Handler, C. Göbel, A. Massafferri, Paolo Vitulo, J. M. De Miranda, Marco Giammarchi, J. N. Butler, M. Mezzadri, L. Edera, T.F. Davenport, Iuri Muniz Pepe, J. E. Ramirez, H. Mendez, I. Segoni, E. Cuautle, P. H. Kasper, A. Rahimi, A. Paris, A. M. Lopez, and Eric Wayne Vaandering
Subjects: Physics, Baryon, Nuclear physics, Nuclear and High Energy Physics, Particle physics
Abstract: In this Letter we present a measurement of the natural widths of Σ c 0 and Σ c ++ . Using data from the FOCUS experiment, we find Γ ( Σ c 0 )=1.55 +0.41 −0.37 ±0.38 MeV/ c 2 and Γ ( Σ c ++ )=2.05 +0.41 −0.38 ±0.38 MeV/ c 2 . The first errors are statistical, the second systematic. These results are obtained with a sample of 913 Σ c 0 →Λ c + π − decays and 1110 Σ c ++ →Λ c + π + decays. These results are compared with recent theoretical predictions.
Published: 2002

33. Implementation of an object oriented track reconstruction model into multiple LHC experiments

Author: I. Gaines, S. Gonzalez, and Si-Jin Qian
Subjects: Object-oriented programming, Theoretical computer science, Tracking model, Large Hadron Collider, Programming language, business.industry, Computer science, Software development, General Physics and Astronomy, Kalman filter, Track circuit, computer.software_genre, law.invention, Software framework, Software, Hardware and Architecture, law, business, computer
Abstract: An Object Oriented (OO) model (Gaines et al., 1996; 1997; Gaines and Qian, 1998; 1999) for track reconstruction by the Kalman filtering method has been designed for high energy physics experiments at high luminosity hadron colliders. The model has been coded in the C++ programming language and has been successfully implemented into the OO computing environments of both the CMS (1994) and ATLAS (1994) experiments at the future Large Hadron Collider (LHC) at CERN. We shall report: (1) how the OO model was adapted, with largely the same code, to different scenarios and serves the different reconstruction aims in different experiments (i.e. the level-2 trigger software for ATLAS and the offline software for CMS); (2) how the OO model has been incorporated into different OO environments with a similar integration structure (demonstrating the ease of re-use of OO program); (3) what are the OO model's performance, including execution time, memory usage, track finding efficiency and ghost rate, etc.; and (4) additional physics performance based on use of the OO tracking model. We shall also mention the experience and lessons learned from the implementation of the OO model into the general OO software framework of the experiments. In summary, our practice shows that the OO technology really makes the software development and the integration issues straightforward and convenient; this may be particularly beneficial for the general non-computer-professional physicists.
Published: 2001

34. Evidence for a narrow dip structure at 1.9 GeV/c2 in 3π+3π− diffractive photoproduction

Author: P.L. Frabetti, H.W.K. Cheung, J.P. Cumalat, C. Dallapiccola, J.F. Ginkel, W.E. Johns, M.S. Nehring, E.W. Vaandering, J.N. Butler, S. Cihangir, I. Gaines, P.H. Garbincius, L. Garren, S.A. Gourlay, D.J. Harding, P. Kasper, A. Kreymer, P. Lebrun, S. Shukla, M. Vittone, R. Baldini-Ferroli, S. Bianco, F.L. Fabbri, S. Sarwar, A. Zallo, C. Cawlfield, R. Culbertson, R.W. Gardner, E. Gottschalk, R. Greene, K. Park, A. Rahimi, J. Wiss, G. Alimonti, G. Bellini, M. Boschini, D. Brambilla, B. Caccianiga, L. Cinquini, M. DiCorato, P. Dini, M. Giammarchi, P. Inzani, F. Leveraro, S. Malvezzi, D. Menasce, E. Meroni, L. Milazzo, L. Moroni, D. Pedrini, L. Perasso, F. Prelz, A. Sala, S. Sala, D. Torretta, D. Buchholz, D. Claes, B. Gobbi, B. O'Reilly, J.M. Bishop, N.M. Cason, C.J. Kennedy, G.N. Kim, T.F. Lin, D.L. Puseljic, R.C. Ruchti, W.D. Shephard, J.A. Swiatek, Z.Y. Wu, V. Arena, G. Boca, G. Bonomi, C. Castoldi, G. Gianini, M. Merlo, S.P. Ratti, C. Riccardi, L. Viola, P. Vitulo, A.M. Lopez, L. Mendez, A. Mirles, E. Montiel, D. Olaya, J.E. Ramirez, C. Rivera, Y. Zhang, J.M. Link, V.S. Paolone, P.M. Yager, J.R. Wilson, J. Cao, M. Hosack, P.D. Sheldon, F. Davenport, K. Cho, K. Danyo, T. Handler, B.G. Cheon, Y.S. Chung, J.S. Kang, K.Y. Kim, K.B. Lee, and S.S. Myung
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Structure (category theory), Fermilab, High Energy Physics - Experiment
Abstract: A narrow dip structure has been observed at 1.9 GeV/c$^2$ in a study of diffractive photoproduction of the $~3\pi^+3\pi^-$ final state performed by the Fermilab experiment E687., Comment: The data of Figure 6 can be obtained by downloading the raw data file e687_6pi.txt. v5 (2nov2018): added Fig. 7, the 6 pion energy distribution as requested by a reader
Published: 2001

35. Measurement of the relative branching ratio BR(Ξc+→p+K−π+)/BR(Ξc+→Ξ−π+π+)

Author: J.M. Link, M. Reyes, P.M. Yager, J.C. Anjos, I. Bediaga, C. Göbel, J. Magnin, A. Massafferri, J.M. de Miranda, I.M. Pepe, A.C. dos Reis, F.R.A. Simão, S. Carrillo, E. Casimiro, A. Sánchez-Hernández, C. Uribe, F. Vázquez, L. Cinquini, J.P. Cumalat, B. O'Reilly, J.E. Ramirez, E.W. Vaandering, J.N. Butler, H.W.K. Cheung, I. Gaines, P.H. Garbincius, L.A. Garren, E. Gottschalk, P.H. Kasper, A.E. Kreymer, R. Kutschke, S. Bianco, F.L. Fabbri, S. Sarwar, A. Zallo, C. Cawlfield, D.Y. Kim, A. Rahimi, J. Wiss, R. Gardner, Y.S. Chung, J.S. Kang, B.R. Ko, J.W. Kwak, K.B. Lee, H. Park, G. Alimonti, M. Boschini, B. Caccianiga, P. D'Angelo, M. DiCorato, P. Dini, M. Giammarchi, P. Inzani, F. Leveraro, S. Malvezzi, D. Menasce, M. Mezzadri, L. Milazzo, L. Moroni, D. Pedrini, C. Pontoglio, F. Prelz, M. Rovere, A. Sala, S. Sala, T.F. Davenport III, L. Agostino, V. Arena, G. Boca, G. Bonomi, G. Gianini, G. Liguori, M.M. Merlo, D. Pantea, S.P. Ratti, C. Riccardi, I. Segoni, L. Viola, P. Vitulo, H. Hernandez, A.M. Lopez, H. Mendez, L. Mendez, A. Mirles, E. Montiel, D. Olaya, A. Paris, J. Quinones, C. Rivera, W. Xiong, Y. Zhang, J.R. Wilson, K. Cho, T. Handler, D. Engh, M. Hosack, W.E. Johns, M. Nehring, P.D. Sheldon, K. Stenson, M. Webster, and M. Sheaff
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, Pi, Analytical chemistry
Abstract: We report the observation of the Cabibbo suppressed decay \Xi_c^+ \to p K^-\pi^+ using data collected with the FOCUS spectrometer during the 1996--97 Fermilab fixed target run. We find a \Xi_c^+ signal peak of 202\pm35 events. We have measured the relative branching ratios BR(\Xi^+_c\to p K^-\pi^+)/BR(\Xi^+_c\to\Xi^-\pi^+\pi^+)= 0.234 \pm 0.047 \pm 0.022 and BR(\Xi^+_c\to p \bar{K}^*(892)^0)/BR(\Xi^+_c\to p K^-\pi^+)= 0.54 \pm 0.09 \pm 0.05 .
Published: 2001

36. Study of the DecayD0→K+π−

Author: Robert K. Kutschke, D. Engh, P. D'Angelo, B. R. Ko, M. Sheaff, Y. S. Chung, John Perry Cumalat, Erik Gottschalk, B. Caccianiga, Y. Zhang, L. Cinquini, C. Göbel, Paolo Vitulo, S. Sarwar, J. Magnin, K. B. Lee, M. DiCorato, L. Milazzo, Paul Sheldon, C. Cawlfield, Marco A. Reyes, A. Sala, I. Bediaga, B. O'Reilly, L. Méndez, E. W. Vaandering, A. Paris, A. Zallo, Harry Cheung, F. R.A. Simão, H. Park, Paolo Dini, Germano Bonomi, Iuri Muniz Pepe, L. Agostino, M. Hosack, E. Casimiro, Fabrizio Fabbri, W. Xiong, A. Massafferi, M. S. Nehring, Daniele Pedrini, J. Quinones, J. N. Butler, Stefano Bianco, D. Olaya, J. W. Kwak, S. P. Ratti, P. M. Yager, C. Pontoglio, I. Segoni, Cristina Riccardi, S. Carrillo, Sandra Malvezzi, H. Hernandez, James E Wiss, F. Leveraro, A. E. Kreymer, J. M. De Miranda, James R. Wilson, Dario Menasce, F. Prelz, M. Mezzadri, T. F. Davenport, C. Uribe, J. E. Ramirez, G. Liguori, C. Rivera, G. Boca, S. Sala, V. Arena, Gianluca Alimonti, Kerstin M. Stenson, F. Vázquez, T. Handler, H. Mendez, A. M. Lopez, M. M. Merlo, I. Gaines, D. Pantea, M. Boschini, P. H. Garbincius, L. A. Garren, E. Montiel, J. M. Link, A. Sanchez-Hernandez, P. Inzani, P. H. Kasper, Gabriele Gianini, A. Rahimi, J. S. Kang, W. E. Johns, Kyung-Suk Cho, J. C. Anjos, Marco Giammarchi, D. Y. Kim, A. Mirles, Michael S. Webster, Robert Gardner, Marco Rovere, L. Viola, Luigi Moroni, and A. C. dos Reis
Subjects: Physics, Meson, Yield (chemistry), Pi, Analytical chemistry, General Physics and Astronomy, Charm (quantum number), Large sample
Abstract: Using a large sample of photoproduced charm mesons from the FOCUS experiment at Fermilab (FNAL-E831), we observe the decay D0-->K+pi- with a signal yield of 149+/-31 events compared to a similarly cut sample consisting of 36 760+/-195 D0-->K-pi+ events. We use the observed ratio of D0-->K+pi- to D0-->K-pi+ (0.404+/-0.085+/-0.025)% to obtain a relationship between the D0 mixing and doubly Cabibbo suppressed decay parameters.
Published: 2001

37. Measurements of the Σ0 and Σ++ mass splittings

Author: L. A. Garren, E. Montiel, H. Mendez, D Brambilla, Luigi Moroni, Y. J. Kwon, J. E. Ramirez, E. W. Vaandering, F. R.A. Simão, P. D'Angelo, F. L. Fabbri, A. C. dos Reis, S. Carrillo, M. V. Purohit, I. Gaines, J. M. De Miranda, T. F. Davenport, Y. Zhang, Kevin Stenson, V. Arena, N. K. Copty, A. M. Lopez, Michael S. Webster, V. Paolone, M. Boschini, Robert Gardner, Marco Rovere, P. H. Garbincius, S. Sala, M. S. Nehring, J. W. Kwak, S. P. Ratti, John Perry Cumalat, L. Méndez, A. Sanchez-Hernandez, A. Sala, Paolo Dini, M. Hosack, E. Casimiro, J. C. Anjos, Ignacio Bediaga, Marco Giammarchi, L. Cinquini, D. Engh, P. Torre, S. S. Myung, A Calandrino, B. R. Ko, Germano Bonomi, H. Hernandez, A. Rahimi, G. Boca, James R. Wilson, C. Cawlfield, D. Y. Kim, Marco A. Reyes, G. Liguori, A. E. Kreymer, M Sales, M. DiCorato, L. Viola, J. Magnin, L. Milazzo, J. Quinones, K. Cho, P. M. Yager, B. O'Reilly, Dario Menasce, F. Vázquez, A. Zallo, C. Rivera, P. H. Kasper, Stephen A. Gourlay, M. Mezzadri, M. M. Merlo, J. N. Butler, Sandra Malvezzi, B. Caccianiga, C. Göbel, J. M. Link, R. Kutschke, Paul Sheldon, Gabriele Gianini, K. S. Park, Y. S. Chung, James E Wiss, F. Leveraro, D. Pantea, F. Prelz, W. E. Johns, C. Uribe, Paolo Vitulo, Gianluca Alimonti, T. Handler, Erik Gottschalk, D. Olaya, Stefano Bianco, Cristina Riccardi, S. Sarwar, K. B. Lee, Harry Cheung, Hyangkyu Park, A. Mirles, Daniele Pedrini, P. Inzani, J. S. Kang, M. Sheaff, and Iuri Muniz Pepe
Subjects: Nuclear physics, Charmed baryons, Physics, Nuclear and High Energy Physics, Isospin, Analytical chemistry, Fermilab
Abstract: Using a high statistics sample of photoproduced charmed particles from the FOCUS experiment at Fermilab (FNAL-E831), we measure the mass splittings of the charmed baryons Σ c 0 and Σ c ++ . We find M(Σ c 0 −Λ c + ) =167.38 ±0.21 ±0.13 MeV /c 2 and M(Σ c ++ −Λ c + ) =167.35 ±0.19 ±0.12 MeV /c 2 with samples of 362±36 and 461±39 events, respectively. We measure the isospin mass splitting M(Σ c ++ −Σ c 0 ) to be −0.03 ±0.28 ±0.11 MeV /c 2 . The first errors are statistical and the second are systematic.
Published: 2000

38. Observation of a narrow state decaying into Ξ0π+

Author: C. J. Kennedy, F. Prelz, P. H. Garbincius, Robert Gardner, V. Arena, P. M. Yager, Germano Bonomi, Y. Zhang, I. Gaines, E. Meroni, S. S. Myung, F. L. Fabbri, A. Mirles, C. Rivera, J. F. Ginkel, N. M. Cason, Sandra Malvezzi, J. N. Butler, K. Y. Kim, M. S. Nehring, B. Gobbi, G. N. Kim, Daniele Pedrini, T. Handler, E. Gottschalk, L. A. Garren, James R. Wilson, Randy Ruchti, P. Inzani, A. Zallo, S. P. Ratti, E. Ramirez, D. Claes, S. Shukla, C. Castoldi, A. Rahimi, L. Milazzo, F. Leveraro, S. Sarwar, K. B. Lee, D. J. Harding, E. Montiel, D. L. Puseljic, J. S. Kang, R. Culbertson, Marco Giammarchi, B. O'Reilly, J. M. Link, Harry Cheung, C. Dallapiccola, D. Olaya, Paolo Dini, S. Cihangir, D. Torretta, M. Hosack, G. Alimonti, M. Boschini, A. E. Kreymer, P. Lebrun, W. D. Shephard, Stefano Bianco, Cristina Riccardi, L. Mendez, James E Wiss, Paul Sheldon, W. E. Johns, M. Di Corato, Gabriele Gianini, K. S. Park, John Perry Cumalat, L. Cinquini, Dario Menasce, F. Davenport, J. M. Bishop, J. Gao, Paolo Vitulo, Stephen A. Gourlay, R. Greene, J. A. Swiatek, M. M. Merlo, P. L. Frabetti, Y. S. Chung, A. Sala, D. Brambilla, K. Danyo, G. Boca, V. Paolone, Alan D. Lopez, S. Sala, D. Buchholz, L. Perasso, P. H. Kasper, T. F. Lin, C. Cawlfield, Z. Y. Wu, B. G. Cheon, M. Vittone, B. Caccianiga, G. Bellini, E. W. Vaandering, Luigi Moroni, L. Viola, and K. Cho
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, chemistry, chemistry.chemical_element, State (functional analysis), Beryllium, Atomic physics
Abstract: We report the observation of the Ξ c ∗+ state decaying into Ξc0π+ with Ξ c 0 →Λ K 0 π + π − or ΛK−π+π+π−. We have observed 47±11 candidate events for the Ξ c ∗+ state and measured its mass to be 177.1±0.5±1.1 MeV/ c 2 above the Ξc0 mass. We have also measured the Ξc0 mass to be 2470.0±2.8±2.6 MeV/ c 2 .
Published: 1998

39. A new measurement of the lifetime of the Ξ+

Author: S. Shukla, W. D. Shephard, Stefano Bianco, Cristina Riccardi, L. Perasso, James R. Wilson, E. Gottschalk, L. A. Garren, Randy Ruchti, B. Gobbi, D. L. Puseljic, P. Inzani, A. Zallo, Kisoo Lee, Harry Cheung, C. Rivera, V. Arena, C. Dallapiccola, Germano Bonomi, V. Paolone, Gabriele Gianini, K. S. Park, J. F. Ginkel, Y. Zhang, C. J. Kennedy, S. Cihangir, R. Culbertson, N. M. Cason, M. Vittone, Marco Giammarchi, C. Castoldi, D. J. Harding, Alan D. Lopez, M. S. Nehring, F. Prelz, E. Meroni, T. F. Lin, T. Handler, Luigi Moroni, J. N. Butler, S. Sarwar, F. Leveraro, M. Boschini, J. Cao, G. Alimonti, P. M. Yager, A. E. Kreymer, P. Lebrun, J. M. Link, A. Rahimi, B. O'Reilly, Dario Menasce, M. Di Corato, D. Olaya, John Perry Cumalat, Paolo Dini, M. Hosack, Paul Sheldon, W. E. Johns, Fabrizio Fabbri, I. Gaines, Robert Gardner, L. Mendez, D. Buchholz, B. Caccianiga, L. Cinquini, G. N. Kim, P. H. Garbincius, D. Brambilla, E. Ramirez, J. S. Kang, P. H. Kasper, J. M. Bishop, K. Danyo, L. Milazzo, J. A. Swiatek, G. Boca, G. Bellini, K. Y. Kim, E. W. Vaandering, James E Wiss, L. Viola, C. Cawlfield, K. Cho, Daniele Pedrini, Z. Y. Wu, S. Sala, D. Claes, B. G. Cheon, A. Mirles, Richard L. Greene, D. Torretta, S. P. Ratti, Paolo Vitulo, S. S. Myung, Sandra Malvezzi, P. L. Frabetti, E. Montiel, F. Davenport, Stephen A. Gourlay, M. M. Merlo, Y. S. Chung, and A. Sala
Subjects: Physics, Nuclear physics, Hadronic decay, Nuclear and High Energy Physics, High energy, chemistry, Mass spectrum, chemistry.chemical_element, Fermilab, Atomic physics, Beryllium
Abstract: New measurements of the lifetime and mass of the Ξ c + are presented. The Ξ c + has been reconstructed through the two decay channels Ξ − π + π + and Σ + K − π + . The data were accumulated by the Fermilab high energy photoproduction experiment E687. The lifetime is measured to be 0.34 +0.07 −0.05 (stat.)±0.02 (syst.) ps while the mass is measured to be 2465.8±1.9 (stat.)±2.5 (syst.) MeV/c 2 .
Published: 1998

40. Analysis of the D+, D+ → π−π+π+ Dalitz plots

Author: C. Rivera, J. F. Ginkel, L. Mendez, R. Greene, G. Bellini, E. W. Vaandering, J. N. Butler, S. S. Myung, Luigi Moroni, John Perry Cumalat, C. J. Kennedy, A. Zallo, L. Perasso, F. Davenport, T. Handler, E. Meroni, G. P. Grim, Gianluca Alimonti, N. M. Cason, Z. Y. Wu, P. M. Yager, Sandra Malvezzi, J. S. Kang, P. L. Frabetti, Stephen A. Gourlay, Paul Sheldon, L. Cinquini, L. Milazzo, D. J. Harding, B. G. Cheon, B. Caccianiga, M. M. Merlo, J. M. Bishop, R. Culbertson, Dario Menasce, F. Prelz, W. E. Johns, B. O'Reilly, I. Gaines, L. Viola, Marco Giammarchi, A. E. Kreymer, P. Lebrun, S. P. Ratti, J. M. Link, M. Vittone, E. Ramirez, D. Brambilla, Paolo Dini, M. Boschini, P. H. Garbincius, S. Sarwar, K. Danyo, Germano Bonomi, D. Olaya, M. Hosack, B. Gobbi, Y. S. Chung, M. Di Corato, K. Y. Kim, G. Boca, F. L. Fabbri, V. Arena, Robert Gardner, Y. Zhang, Paolo Vitulo, Gabriele Gianini, W. D. Shephard, Stefano Bianco, J. Hughes, Cristina Riccardi, D. Buchholz, M. S. Nehring, J. A. Swiatek, Daniele Pedrini, G. N. Kim, P. Inzani, James R. Wilson, K. B. Lee, D. Claes, D. L. Puseljic, A. Sala, James E Wiss, F. Leveraro, C. Castoldi, D. Torretta, Harry Cheung, P. H. Kasper, A. Rahimi, V. Paolone, Alan D. Lopez, C. Dallapiccola, S. Sala, T. F. Lin, C. Cawlfield, J. Cao, S. Shukla, L. A. Garren, E. Montiel, Randy Ruchti, and S. Cihangir
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Amplitude, Dalitz plot, Fermilab
Abstract: An amplitude analysis of the D+, Ds+ → π−π+π+ Dalitz plots is presented using data collected by the Fermilab high-energy photoproduction experiment E687. The data are fitted to a model consisting of a sum of relativistic Breit-Wigner amplitudes for the intermediate two-body resonant decay modes plus a flat non-resonant contribution. From the fit we derive decay fractions and relative phases. We also present measurements of Γ(D + →π − π + π + ) Γ(D + →K − π + π + ) and Γ(D s + →π − π + π + ) Γ(D s + →K − K + π + ) .
Published: 1997

41. Study of charged hadronic five-body decays of the D+ and D+ mesons

Author: J. F. Ginkel, G. Bellini, S. Cihangir, V. Arena, D. Buchholz, J. R. Wilson, A. Lopeze, D. Brambilla, K. Danyo, G. Boca, N. M. Cason, James E Wiss, F. Leveraro, R. Culbertson, Gianluca Alimonti, M. Vittone, Marco Giammarchi, R. Greene, P. H. Kasper, S. Sarwar, B. Gobbi, D. L. Puseljic, A. Sala, V. Paolone, I. Gaines, Fabrizio Fabbri, C. Dallapiccola, L. Perasso, M. Boschini, B. O'Reilly, S. Shukla, Harry Cheung, P. H. Garbincius, M. Gullotta, G. N. Kim, Z. Y. Wu, T. Handler, Sandra Malvezzi, Daniele Pedrini, P. L. Frabetti, B. Caccianiga, W. D. Shephard, Stefano Bianco, Dario Menasce, C. J. Kennedy, A. E. Kreymer, P. Lebrun, L. A. Garren, Cristina Riccardi, W. E. Johns, B. G. Cheon, F. Prelz, Randy Ruchti, Paolo Vitulo, P. Inzani, D. Claes, K. Y. Kim, E. Meroni, G. P. Grim, P. M. Yager, M. Di Corato, C. Castoldi, J. S. Kang, D. Torretta, S. P. Ratti, John Perry Cumalat, L. Cinquini, J. M. Bishop, M. S. Nehring, F. Davenport, Stephen A. Gourlay, D. J. Harding, A. Zallo, Gabriele Gianini, L. Viola, S. Sala, T. F. Lin, Luigi Moroni, Robert Gardner, J. A. Swiatek, Paul Sheldon, and J. N. Butler
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Meson, Hadron, Fermilab
Abstract: Charged hadronic five-body decays of D + and D s + mesons have been studied in the E687 photoproduction experiment at Fermilab. We report the first compelling evidence of the decay mode D + , D s + → π − π − β + π + π + and the measurements of the decays D + → K − π − π + π + π + , D s + → K − K + π − π + π + and D s + → φπ − π + π + . An analysis of the D + → K − π − π + π + π + resonance structure is also presented.
Published: 1997

42. Search for rare and forbidden decays of the charmed meson D+

Author: S. Cihangir, A. Rahimi, John Perry Cumalat, C. Castoldi, J. Hughes, T. Handler, L. Milazzo, L. Cinquini, S. S. Myung, D. Brambilla, A. E. Kreymer, P. Lebrun, K. Danyo, L. A. Garren, Randy Ruchti, S. Shukla, W. E. Johns, Luigi Moroni, J. N. Butler, G. Boca, M. Di Corato, Daniele Pedrini, J. M. Bishop, T. F. Lin, Sandra Malvezzi, P. L. Frabetti, M. Boschini, E. Ramirez, J. Cao, R. Greene, P. Inzani, D. Claes, P. H. Garbincius, Dario Menasce, F. Prelz, K. Y. Kim, J. R. Wilson, J. M. Link, C. Dallapiccola, F. Davenport, G. N. Kim, D. Olaya, S. Sala, G. Bellini, D. Buchholz, D. L. Puseljic, A. Sala, E. W. Vaandering, Robert Gardner, D. Torretta, L. Perasso, Harry Cheung, A. Zallo, M. S. Nehring, Kisoo Lee, F. Leveraro, R. Culbertson, P. H. Kasper, Marco Giammarchi, Z. Y. Wu, Stephen A. Gourlay, C. J. Kennedy, N. M. Cason, M. M. Merlo, B. G. Cheon, S. P. Ratti, C. Cawlfield, J. A. Swiatek, B. O'Reilly, Paul Sheldon, L. Méndez, I. Gaines, Alan D. Lopez, Gabriele Gianini, Paolo Dini, B. Gobbi, W. D. Shephard, Stefano Bianco, M. Hosack, C. Rivera, M. Vittone, V. Arena, Y. S. Chung, Cristina Riccardi, J. F. Ginkel, L. Viola, P. M. Yager, D. J. Harding, E. Montiel, Fabrizio Fabbri, James E Wiss, S. Sarwar, Germano Bonomi, E. Meroni, G. P. Grim, Y. Zhang, Gianluca Alimonti, J. S. Kang, V. S. Paolone, B. Caccianiga, and Paolo Vitulo
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Flavor-changing neutral current, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Fermilab, Lepton number, Lepton
Abstract: We report on the results of a search for fourteen flavor changing neutral current, lepton number violating, or lepton family number violating decays of the charmed meson D + in the large charm sample recorded by the Fermilab photoproduction experiment E687. No evidence is seen for these rare and standard-model-forbidden decays, of the form D + → h ± l ∓ l + (with h = π , K and l = e , μ ); we determine 90% confidence level upper limits on their absolute branching fractions in the range (9–20) × 10 −5 .
Published: 1997

43. Observation of the vector meson Cabibbo suppressed decay D+ → ρ0π+ν

Author: Daniele Pedrini, N. M. Cason, V. S. Paolone, S. Cihangir, C. J. Kennedy, D. Claes, P. M. Yager, B. O'Reilly, R. Culbertson, Marco Giammarchi, Dario Menasce, R. Greene, M. Boschini, Paolo Vitulo, B. Gobbi, E. Meroni, G. P. Grim, Paul Sheldon, W. E. Johns, D. Brambilla, K. Danyo, J. S. Kang, S. Shukla, F. Leveraro, G. Boca, T. F. Lin, L. Viola, V. Arena, K. Y. Kim, S. Sala, L. A. Garren, Robert Gardner, Randy Ruchti, J. A. Swiatek, James E Wiss, James R. Wilson, Luigi Moroni, A. Sala, F. L. Fabbri, M. S. Nehring, D. J. Harding, F. Davenport, Gabriele Gianini, S. P. Ratti, Stephen A. Gourlay, P. Inzani, A. Zallo, I. Gaines, J. F. Ginkel, John Perry Cumalat, L. Cinquini, J. M. Bishop, J. N. Butler, P. H. Garbincius, G. Alimonti, A. E. Kreymer, C. Dallapiccola, P. Lebrun, Z. Y. Wu, M. Di Corato, B. G. Cheon, G. N. Kim, M. Vittone, Sandra Malvezzi, C. Castoldi, W. D. Shephard, Stefano Bianco, D. Buchholz, P. L. Frabetti, B. Caccianiga, Cristina Riccardi, G. Bellini, L. Perasso, P. H. Kasper, S. Sarwar, D. L. Puseljic, Alan D. Lopez, Harry Cheung, F. Prelz, D. Torretta, and T. Handler
Subjects: Semileptonic decay, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, Vector meson, Fermilab, Measure (mathematics)
Abstract: We report on the first statistically significant observation of the vector meson Cabibbo suppressed semileptonic decay D+ → ρ0μ+ν. We measure the branching ratio of the decay mode D+ → ρ0μ+ν (plus possible unobserved γ from D+ → η′μ+ν, η′ → γρ0) with respect to the decay mode D + → K ∗0 μ + ν to be BR (D + → ρ 0 μ + ν) BR (D + → K ∗0 μ + ν) = 0.079 ± 0.019 ( stat ) ± 0.013 ( syst ) . Data were collected by Fermilab photoproduction experiment E687.
Published: 1997

44. Analysis of the Cabibbo suppressed decay D0 → π−l+ν

Author: D. L. Puseljic, C. Castoldi, V. Arena, Harry Cheung, G. R. Blackett, D. J. Harding, Z. Y. Wu, N. M. Cason, B. Gobbi, Paolo Vitulo, S. Cihangir, B. G. Cheon, F. Prelz, James E Wiss, T. F. Lin, V. S. Paolone, F. Davenport, W. D. Shephard, Stefano Bianco, F. L. Fabbri, M. Vittone, C. J. Kennedy, G. N. Kim, D. Torretta, Dario Menasce, Cristina Riccardi, L. Perasso, Alan D. Lopez, S. Shukla, R. Culbertson, P. M. Yager, Marco Giammarchi, B. O'Reilly, G. Alimonti, A. E. Kreymer, P. Inzani, John Perry Cumalat, P. Lebrun, A. Zallo, L. Cinquini, S. Sala, Daniele Pedrini, M. Pisharody, M. Di Corato, D. Buchholz, M. S. Nehring, B. Caccianiga, J. M. Bishop, M. Boschini, L. A. Garren, P. H. Kasper, D. Claes, Gabriele Gianini, S. Sarwar, F. Leveraro, W. E. Johns, Randy Ruchti, Paul Sheldon, G. Bellini, J. S. Kang, James R. Wilson, K. Y. Kim, E. Meroni, G. P. Grim, Sandra Malvezzi, P. L. Frabetti, R. Greene, D. Brambilla, K. Danyo, G. Boca, Stephen A. Gourlay, A. Sala, J. F. Ginkel, J. N. Butler, P. H. Garbincius, S. P. Ratti, I. Gaines, Luigi Moroni, T. Handler, L. Viola, C. Dallapiccola, Robert Gardner, and J. A. Swiatek
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Muon, Branching fraction, Analytical chemistry, Electron, Fermilab
Abstract: Results for the Cabibbo suppressed semileptonic decays D 0 → π − e + ν and D 0 → π − μ + ν (charge conjugates are implied) are reported by Fermilab photoproduction experiment E687. We find 45.4 ± 13.3 events in the electron mode and 45.6 ± 11.8 in the muon mode. The relative branching ratio BR (D 0 →π − l + v) BR (D 0 →K − l + v) for the combined sample is measured to be 0.101 ± 0.020 (stat.) ± 0.003 (syst.) 14 .
Published: 1996

45. Charm-anticharm asymmetries in high energy photoproduction

Author: G. N. Kim, J. S. Kang, I. Gaines, S. Shukla, C. Castoldi, S. P. Ratti, S. Sarwar, Sandra Malvezzi, Paolo Vitulo, B. O'Reilly, T. Handler, D. L. Puseljic, A. Sala, P. L. Frabetti, Dario Menasce, John Perry Cumalat, W. E. Johns, Byung Gu Cheon, B. Gobbi, V. S. Paolone, F. Davenport, Harry Cheung, F. Prelz, L. Cinquini, James E Wiss, Daniele Pedrini, P. Inzani, M. Pisharody, D. Claes, L. A. Garren, J. M. Bishop, B. Caccianiga, E. Meroni, G. P. Grim, J. F. Ginkel, Randy Ruchti, S. Cihangir, J. R. Wilson, V. Arena, Alan D. Lopez, W. D. Shephard, Stefano Bianco, Cristina Riccardi, A. E. Kreymer, Gabriele Gianini, P. Lebrun, M. Boschini, M. S. Nehring, P. H. Garbincius, Paul Sheldon, N. M. Cason, R. Culbertson, M. Di Corato, Marco Giammarchi, D. J. Harding, Gianluca Alimonti, Stephen A. Gourlay, L. Perasso, C. Dallapiccola, K. Y. Kim, A. Zallo, G. R. Blackett, D. Buchholz, P. H. Kasper, F. Leveraro, D. Torretta, J. N. Butler, S. Sala, T. F. Lin, C. J. Kennedy, P. M. Yager, M. Vittone, Fabrizio Fabbri, R. Greene, Luigi Moroni, G. Bellini, L. Viola, Robert Gardner, J. A. Swiatek, Z. Y. Wu, D. Brambilla, K. Danyo, and G. Boca
Subjects: Physics, Nuclear and High Energy Physics, High energy, Particle physics, Meson, High Energy Physics::Lattice, media_common.quotation_subject, Nuclear Theory, High Energy Physics::Phenomenology, Asymmetry, Charm quark, Baryon, Nuclear physics, High Energy Physics::Experiment, Fermilab, Nuclear Experiment, media_common
Abstract: We report measurements of charm particle production asymmetries from the Fermilab photoproduction experiment E687. An asymmetry in the rate of production of charm versus anticharm particles is expected to arise primarily from fragmentation effects. We observe statistically significant asymmetries in the photoproduction of D+, D ∗+ and D0 mesons and find small (but statistically weak) asymmetries in the production of the Ds+ meson and the Λc+ baryon. Our inclusive photoproduction asymmetries are compared to predictions from nonperturbative models of charm quark fragmentation.
Published: 1996

46. Study of higher mass charm baryons decaying to Λ+

Author: B. O'Reilly, T. F. Lin, V. S. Paolone, F. Davenport, R. Greene, W. E. Johns, Sandra Malvezzi, C. Castoldi, B. Caccianiga, P. L. Frabetti, D. Buchholz, B. Gobbi, Z. Y. Wu, Dario Menasce, P. Lebrun, Stephen A. Gourlay, K. Y. Kim, F. Prelz, F. L. Fabbri, M. Boschini, B. G. Cheon, James E Wiss, P. H. Garbincius, S. Shukla, F. Leveraro, M. S. Nehring, D. Torretta, D. Brambilla, G. Bellini, S. Sala, P. H. Kasper, C. J. Kennedy, K. Danyo, R. Culbertson, James R. Wilson, L. Viola, Marco Giammarchi, L. Perasso, N. M. Cason, G. R. Blackett, G. Boca, S. Sarwar, T. Handler, M. Vittone, E. Meroni, John Perry Cumalat, G. P. Grim, Gianluca Alimonti, L. A. Garren, V. Arena, L. Cinquini, Alan D. Lopez, P. M. Yager, Luigi Moroni, J. F. Ginkel, Randy Ruchti, Paolo Vitulo, W. D. Shephard, Stefano Bianco, S. Cihangir, J. M. Bishop, Cristina Riccardi, S. P. Ratti, J. S. Kang, Robert Gardner, J. N. Butler, J. A. Swiatek, Daniele Pedrini, D. L. Puseljic, A. Sala, Paul Sheldon, P. Inzani, D. Claes, Harry Cheung, A. Zallo, I. Gaines, D. J. Harding, M. Pisharody, Gabriele Gianini, G. N. Kim, A. E. Kreymer, M. Di Corato, and C. Dallapiccola
Subjects: Baryon, Physics, Nuclear and High Energy Physics, Branching fraction, Analytical chemistry, State (functional analysis), Charm (quantum number), Atomic physics, Lower limit
Abstract: We report on the study of charm baryons decaying to Λ c + : Λ c ★+ (2625) → Λ c + π + π − , Λ c ★+ (2593) → Λ c + π + π − , Σ c 0 → Λ c + π − and Σ c ++ → Λ c + π + . We present a confirmation of the state Λ c ∗+ (2593) and determine its mass difference to be M ( Λ c ★+ (2593)) − M ( Λ c + ) = 309.2 ± 0.7 ± 0.3 MeV/ c 2 . We determine the lower limit on the resonant branching ratio to be BR (Λ c ★+ (2593) → Σ c π ± Λ c ★+ (2593) → Λ c + π + π − ) > 0.51 (90% c.l.). We also measure the mass differences M ( Σ c 0 ) − M ( Λ c + ) = 166.6±0.5±0.6 MeV/ c 2 and M ( Σ c ++ ) − M ( Λ c + ) = 167.6±0.6±0.6 MeV/ c 2 . Finally, we measure the relative photoproduction cross sections for Λ c ★+ and Σ c with respect to the (inclusive) photoproduction cross section for Λ c + .
Published: 1996

47. Analysis of the decay mode D0 → K−μ+ν

Author: P. Inzani, D. Claes, S. Sarwar, D. L. Puseljic, W. D. Shephard, Stefano Bianco, Cristina Riccardi, A. Spallone, James E Wiss, R. Diaferia, D. J. Harding, James R. Wilson, R. Yoshida, F. Leveraro, Paul Sheldon, G. Boca, M. Vittone, B. O'Reilly, L. Garren, J. S. Kang, E. Meroni, G. P. Grim, John Perry Cumalat, S. Cihangir, Sandra Malvezzi, D. Torretta, Gianluca Alimonti, T. Handler, Alan D. Lopez, V. S. Paolone, L. Cinquini, I. Gaines, Senta Greene, C. W. Bogart, P. L. Frabetti, T. F. Lin, B. Caccianiga, N. M. Cason, J. M. Bishop, A. Zallo, J. F. Ginkel, Marco Giammarchi, Dario Menasce, K. Y. Kim, J. N. Butler, H. Mendez, Paolo Vitulo, J. F. Filasetta, M. Pisharody, E. J. Mannel, B. Gobbi, G. R. Blackett, P. H. Garbincius, D. Buchholz, S. Sala, J. D. Cunningham, P. M. Yager, S. Culy, K. Lingel, Gabriele Gianini, Fabrizio Fabbri, Z. Y. Wu, R. Greene, R. J. Mountain, S. P. Ratti, H. W.K. Cheung, B. G. Cheon, L. Perasso, R. Culbertson, P. H. Kasper, V. Arena, F. Davenport, Randy Ruchti, G. Jaross, Willard Johns, S. Shukla, Stephen A. Gourlay, G. N. Kim, J. K. Busenitz, C. J. Kenney, C. Castoldi, S. Park, A. E. Kreymer, P. Lebrun, M. Di Corato, Luigi Moroni, Robert Gardner, J. A. Swiatek, M. E. Zanabria, C. Dallapicola, M. S. Nehring, G. Bellini, and Daniele Pedrini
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Branching fraction, Analytical chemistry, Charge (physics), Electron
Abstract: Fermilab high-energy photoproduction experiment E687 provides a high statistics sample of the decay mode D + → K ∗0 μ + ν (charge conjugates are implied). Our analysis yields a branching ratio of Γ (D + → K ∗0 μ + ν) Γ (D + → K − π + π + ) = 0.56±0.04±0.06 . The ratios of the form factors governing the decay are measured to be R ν = 1.74 ±0.27±0.28 and R 2 = 0.78±0.18±0.10, implying a polarization of Γ l Γ t = 1.20±0.13 ±0.13 for the electron decay. Finally, we report new limits on the decay modes D + → K − π + μ + ν (nonresonent) and D + → K ∗0 π 0 μ + ν .
Published: 1995

48. Search for the decay of D+ and D+ mesons to three charged kaons

Author: Robert Gardner, D. L. Puseljic, A. Sala, M. Boschini, P. Inzani, D. Brambilla, K. Danyo, A. Zallo, G. N. Kim, G. Boca, G. Bellini, J. A. Swiatek, James E Wiss, N. M. Cason, Paul Sheldon, S. Sala, B. O'Reilly, A. E. Kreymer, D. J. Harding, P. Lebrun, J. R. Wilson, Gianluca Alimonti, R. Culbertson, J. S. Kang, Luigi Moroni, G. R. Blackett, Randy Ruchti, M. Vittone, W. D. Shephard, Stefano Bianco, M. Pisharody, M. Di Corato, Cristina Riccardi, John Perry Cumalat, S. Shukla, L. Perasso, K. Y. Kim, L. Viola, T. F. Lin, Dario Menasce, Gabriele Gianini, S. P. Ratti, Fabrizio Fabbri, C. Castoldi, J. M. Bishop, Sandra Malvezzi, L. Cinquini, Daniele Pedrini, Marco Giammarchi, P. L. Frabetti, J. F. Ginkel, B. Caccianiga, Z. Y. Wu, D. Buchholz, F. Davenport, C. J. Kennedy, S. Cihangir, L. Garren, E. Meroni, G. P. Grim, B. G. Cheon, S. Sarwar, T. Handler, D. Claes, V. Arena, B. Gobbi, P. H. Kasper, Stephen A. Gourlay, V. S. Paolone, P. M. Yager, Alan D. Lopez, D. Torretta, M. S. Nehring, J. N. Butler, I. Gaines, R. Greene, P. H. Garbincius, F. Leveraro, Willard Johns, H. W.K. Cheung, Paolo Vitulo, C. Dallapiccola, and F. Prelz
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, High energy, Meson, Branching fraction
Abstract: We report the results of a search for the doubly Cabibbo suppressed decays D+ → K+K−K+ and D+ → ΦK+, and the singly Cabibbo suppressed decays Ds+ → K+K−K+ and Ds+ → ΦK+. Our measurements are all consistent with zero branching ratio, and we set 90% confidence level upper limits on the relative D+ branching ratios: BR(ΦK + ) BR(Φπ + ) , BR(K + K − K + ) BR(Φπ + ) and BR(K + K − K + ) BR(K − π + π + ) , and the relative Ds+ branching ratios: BR(ΦK + ) BR(Φπ + ) and BR(K + K − K + ) BR(Φπ + ) . The data were accumulated by the Fermilab high energy photoproduction experiment E687.
Published: 1995

49. Doubly and singly Cabibbo suppressed charm decays into the K+π−π+ final state

Author: M. S. Nehring, S. Sala, M. Vittone, V. S. Paolone, John Perry Cumalat, Willard Johns, Paul Sheldon, James E Wiss, F. Leveraro, D. J. Harding, L. Cinquini, J. F. Ginkel, J. S. Kang, T. F. Lin, J. M. Bishop, L. A. Garren, J. N. Butler, B. Caccianiga, E. Meroni, B. O'Reilly, Sandra Malvezzi, M. Boschini, G. P. Grim, K. Y. Kim, Gianluca Alimonti, P. H. Garbincius, Randy Ruchti, P. L. Frabetti, Marco Giammarchi, F. L. Fabbri, Z. Y. Wu, Alan D. Lopez, A. Zallo, S. Shukla, C. Castoldi, M. Pisharody, Dario Menasce, F. Prelz, V. Arena, B. G. Cheon, I. Gaines, D. Buchholz, G. R. Blackett, N. M. Cason, B. Gobbi, P. H. Kasper, Gabriele Gianini, D. Brambilla, L. Perasso, R. Culbertson, S. Cihangir, G. Boca, James R. Wilson, R. Greene, G. Bellini, G. N. Kim, D. Torretta, T. Handler, A. E. Kreymer, P. Lebrun, M. Di Corato, Daniele Pedrini, P. Inzani, D. Claes, H. W.K. Cheung, L. Viola, S. P. Ratti, W. D. Shephard, Stefano Bianco, Luigi Moroni, Cristina Riccardi, C. J. Kennedy, F. Davenport, Robert Gardner, P. M. Yager, S. Sarwar, D. L. Puseljic, A. Sala, J. A. Swiatek, Stephen A. Gourlay, C. Dallapiccola, and Paolo Vitulo
Subjects: Physics, Nuclear and High Energy Physics, Crystallography
Abstract: Branching ratios and upper limits at 90% confidence level for D+ and Ds+ → K+π−π+ decays collected in Fermilab photoproduction experiment E-687 are reported. The D+ results are: Γ(D + → K + π − π + ) Γ(D + → K − π + π + ) = (7.2 ± 2.3 ± 1.7) × 10 −3 , Γ(D + → K ∗0 (892)π + ) Γ(D + → K − π + π + ) , and Γ(D + → K + ϱ 0 (770)) Γ(D + → K − π + π + ) . The Ds+ results are: Γ(D s + → K + π − π + ) Γ(D s + → Φ(1020)π + ) = 0.28 ± 0.06 ± 0.05 , Γ(D s + → K ∗0 (892)π + Γ(D s + → Φ(1020)π + ) = 0.18 ± 0.05 ± 0.04 , and Γ(D s + → K + ϱ 0 (770)) Γ(D s + → Φ(1020)π + ) .
Published: 1995

50. First measurement of the lifetime of the Ω

Author: G. N. Kim, M. Vittone, L. A. Garren, C. Castoldi, Randy Ruchti, B. Gobbi, D. Brambilla, D. J. Harding, Sandra Malvezzi, James E Wiss, S. Sala, K. Danyo, R. Culbertson, B. Caccianiga, P. L. Frabetti, G. Boca, Daniele Pedrini, M. Boschini, N. M. Cason, F. Prelz, S. Cihangir, C. Dallapiccola, F. Davenport, D. Claes, G. Bellini, Paul Sheldon, E. Meroni, V. Arena, G. P. Grim, R. Greene, Luigi Moroni, D. Buchholz, Marco Giammarchi, G. Alimonti, A. E. Kreymer, P. Lebrun, T. Handler, H. W.K. Cheung, F. L. Fabbri, Senta Greene, S. Shukla, I. Gaines, Dario Menasce, Z. Y. Wu, L. Cinquini, M. Di Corato, P. H. Garbincius, C. J. Kennedy, V. S. Paolone, Robert Gardner, A. Sala, M. S. Nehring, S. P. Ratti, D. Torretta, P. Inzani, J. S. Kang, A. Zallo, P. M. Yager, B. G. Cheon, J. F. Ginkel, P. H. Kasper, John Perry Cumalat, J. A. Swiatek, J. N. Butler, M. Pisharody, Stephen A. Gourlay, F. Leveraro, Willard Johns, Gabriele Gianini, Alan D. Lopez, J. M. Bishop, Paolo Vitulo, L. Viola, James R. Wilson, S. Sarwar, G. R. Blackett, B. O'Reilly, D. L. Puseljic, W. D. Shephard, Stefano Bianco, Cristina Riccardi, L. Perasso, K. Y. Kim, and T. F. Lin
Subjects: Hadronic decay, Physics, Nuclear and High Energy Physics, High energy, Nuclear Theory, chemistry.chemical_element, Sigma, Nuclear physics, Charmed baryons, Baryon, chemistry, High Energy Physics::Experiment, Statistical analysis, Fermilab, Beryllium, Nuclear Experiment
Abstract: We present the first measurement of the lifetime of the Ω c 0 baryon. The data were collected in the Fermilab high energy photoproduction experiment E687. The measured lifetime is τ = 86−20+27(stat.) ± 28(syst.) fr. Thus the Ω c 0 has one of the shorter lifetimes among the weakly decaying singly charmed baryons.
Published: 1995

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