Author: "M. Sheaff" - Searchworks@Jio Institute Digital Library Search Results

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359 results on '"M. Sheaff"'

1. Type II Cryoglobulinaemia causing Monoclonal Gammopathy of Renal Significance

Author: B, Mohidin, M, Sheaff, R D, Wheeler, and G, Khamba
Subjects: Stroke, Cryoglobulinemia, Paraproteinemias, Humans, Female, Middle Aged, Kidney, Brain Ischemia
Abstract: A 53 year old female with a background of hypertension, hypothyroidism and Raynaud's was admitted with an acute ischaemic stroke and referred to the renal team after a routine urine dip revealed microscopic haematuria and nephrotic-range proteinuria. Blood tests revealed renal impairment, a monoclonal IgM kappa paraprotein, low complement C4 concentration and a positive rheumatoid factor. Active cryoglobulinaemia was suspected and testing demonstrated type II cryoglobulins secondary to the monoclonal IgM kappa paraprotein. Bone marrow biopsy was normal. Renal biopsy revealed cryoglobulinaemia associated membranoproliferative glomerulonephritis. Treatment with steroids and rituximab improved renal function and proteinuria. This case fits within the evolving spectrum of disorders now termed Monoclonal Gammopathy of Renal Significance and highlights the value of biopsying and treating these patients early.
Published: 2021

2. Plasma cell leukemia masquerading as a relapse of the Nephrotic syndrome

Author: M Sheaff, M Blunden, and B Oliveira
Subjects: medicine.medical_specialty, Nephrotic Syndrome, Plasma Cells, Kidney, Gastroenterology, Leukemia, Plasma Cell, Diagnosis, Differential, 03 medical and health sciences, Remission induction, 0302 clinical medicine, Text mining, Recurrence, Internal medicine, medicine, Humans, Plasma cell leukemia, business.industry, Remission Induction, Kidney pathology, General Medicine, Middle Aged, medicine.disease, Leukemia, Proteinuria, 030220 oncology & carcinogenesis, Creatinine, Prednisone, Female, Creatinine blood, business, Nephrotic syndrome, 030215 immunology
Published: 2018

3. 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

4. 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

5. 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

6. 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

7. 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

8. Banff ’05 Meeting Report: Differential Diagnosis of Chronic Allograft Injury and Elimination of Chronic Allograft Nephropathy (’CAN’)

Author: P. B. Marcus, Ian W. Gibson, Roslyn B. Mannon, Daniel R. Salomon, Michael J. Mihatsch, M. Sheaff, Jeffrey L. Platt, Brian J. Nankivell, Patricia Campbell, Patricia E. Birk, Jan J. Weening, Banu Sis, L. Salinas-Madriga, Kim Solez, A. B. Collins, Mark Haas, Marilia Cascalho, Ian Roberts, Volker Nickeleit, Philip F. Halloran, Michael Mengel, Cinthia B. Drachenberg, John C. Papadimitriou, Paul C. Grimm, Daniel Serón, Parmjeet Randhawa, Robert B. Colvin, Lorraine C. Racusen, Anthony J. Demetris, Helen Liapis, Evelyne Lerut, and Other departments
Subjects: Transplantation, medicine.medical_specialty, Pathology, business.industry, Banff Classification, Cyclosporine nephrotoxicity, chemical and pharmacologic phenomena, Transplant glomerulopathy, medicine.disease, Organ transplantation, surgical procedures, operative, Allograft rejection, Chronic allograft nephropathy, Internal medicine, medicine, Immunology and Allergy, Pharmacology (medical), Differential diagnosis, business, Kidney transplantation
Abstract: The 8th Banff Conference on Allograft Pathology was held in Edmonton, Canada, 15-21 July 2005. Major outcomes included the elimination of the non-specific term "chronic allograft nephropathy" (CAN) from the Banff classification for kidney allograft pathology, and the recognition of the entity of chronic antibody-mediated rejection. Participation of B cells in allograft rejection and genomics markers of rejection were also major subjects addressed by the conference.
Published: 2007

9. 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

10. 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

11. 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

12. 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

13. 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

14. 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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15. 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

16. 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

17. 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

18. 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

19. 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

20. 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

21. 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

22. 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

23. 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

24. 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

25. 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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26. 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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27. 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

28. Angiosarcoma of the breast: a 30 year perspective with an optimistic outlook

Author: S.N. Georgiannos and M. Sheaff
Subjects: Adult, medicine.medical_specialty, medicine.medical_treatment, Hemangiosarcoma, Mammary gland, Breast Neoplasms, Breast cancer, medicine, Humans, Angiosarcoma, business.industry, General surgery, Incidence (epidemiology), Middle Aged, medicine.disease, Surgery, Radiation therapy, Treatment Outcome, medicine.anatomical_structure, Otorhinolaryngology, Adenocarcinoma, Female, Sarcoma, Differential diagnosis, business
Abstract: The aim of this study was to investigate the incidence and clinicopathological features of angiosarcoma of the breast by focusing on those cases passing through a busy general teaching hospital over a 30 year period. A search was carried out of all cases in the files of the Department of Pathology of the Royal London Hospital from 1970 to 2000. Four cases were identified as primary angiosarcomas involving the breast. The medical and surgical histories, macroscopic and microscopic features and clinical outcome with long-term follow-up are described in each case. Similarities were identified, such as initial presentation with a 'bruise' and a latent period before the diagnosis was established. Half of our cases followed irradiation for breast cancer. In all cases the prognosis after surgery was excellent. The rarity of primary mammary angiosarcoma was confirmed. In younger patients the lesion was not associated with previous radiotherapy, but the older patients presented after radiotherapy for adenocarcinoma of the breast. Although very uncommon, these tumours must be considered in the differential diagnosis, especially with the increasing use of fine-needle-aspiration and core biopsy for preoperative diagnosis. The prognosis after complete surgical excision may be better than generally believed.
Published: 2003

29. 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

30. 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

31. 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

32. 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

33. 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

34. Optical readout and control interface for the BTeV pixel vertex detector

Author: G Cancelo, M. A. Vargas, S Vergara-Limon, and M. Sheaff
Subjects: Physics, Nuclear and High Energy Physics, Large Hadron Collider, Pixel, Physics::Instrumentation and Detectors, business.industry, Optical link, Detector, Particle detector, Semiconductor detector, Data acquisition, High Energy Physics::Experiment, Fermilab, business, Instrumentation, Computer hardware
Abstract: Optical links will be used for sending data back and forth from the counting room to the detector in the data acquisition systems for future high energy physics experiments, including ATLAS and CMS in the LHC at CERN (Switzerland) and BTeV at Fermilab (USA). This is because they can be ultra-high speed and are relatively immune to electro-magnetic interference (EMI). The baseline design for the BTeV Pixel Vertex Detector includes two types of optical link, one to control and monitor and the other to read out the hit data from the multi-chip modules on each half-plane of the detector. The design and performance of the first prototype of the Optical Readout and Control Interface for the BTeV Pixel Vertex Detector is described.
Published: 2002

35. 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

36. 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

37. The development of software to characterize the Fermilab pixel readout chip, FPIX1, for the BTeV experiment

Author: M. Sheaff, M.A. Vargas, and S. Vergara
Subjects: Physics, Nuclear and High Energy Physics, Pixel, Physics::Instrumentation and Detectors, business.industry, Integrated circuit, BTeV experiment, Chip, law.invention, Data acquisition, Software, law, System integration, Fermilab, business, Instrumentation, Computer hardware
Abstract: Fermilab has designed and assembled a pixel-readout-chip sub-assembly containing five FPIX1 chips with flexible cable interconnections with which to address the technical issues involved in system integration for the proposed BTeV pixel detector. The module contains a total of 14 400 pixel cells that need to be characterized in order to test the entire module. Software has been developed within the LabVIEW framework to control a set of instruments to perform threshold and noise tests on all five readout chips. These tests take only a few hours to run.
Published: 2001

38. Search for Rare and Forbidden Charm Meson DecaysD0→Vℓ+ℓ−andhhℓℓ

Author: K. O'Shaughnessy, dos Reis Ac, K. C. Peng, A. K. Tripathi, S. M. Yang, N. R. Stanton, Alberto Santoro, A. J. Slaughter, A. Nguyen, P.A. Kasper, S. Yoshida, A. Napier, K. Denisenko, S. B. Bracker, A. Álvarez Fernández, M. Sheaff, S. Amato, D. Yi, D. C. Langs, R. Weiss-Babai, R. A. Burnstein, L. M. Cremaldi, E. Wolin, G. F. Fox, B. Quinn, A.B. d'Oliveira, A. Rafatian, E.M. Aitala, C. James, N. W. Reay, J. Leslie, N. Witchey, S. Takach, G. Hurvits, C. Zhang, S. Watanabe, de Mello Neto, M. V. Purohit, B. Lundberg, R. H. Milburn, H.S. Carvalho, A.K.S. Santha, A.M. Halling, S. Banerjee, Kevin Stenson, J. C. Anjos, J. A. Appel, R. A. Sidwell, J. Magnin, Sokoloff, R. Zaliznyak, D. J. Summers, K. Gounder, Daniel Ashery, T. Carter, A. J. Schwartz, D. A. Sanders, L. Perera, G. Blaylock, G. Herrera, K. Thorne, Simon Kwan, D. Mihalcea, S. Devmal, H. A. Rubin, S. Radeztsky, P. Gagnon, C. L. Darling, R. J. Stefanski, N. K. Copty, J. Solano, J. Wiener, J.J. Reidy, C. Göbel, S. MayTal-Beck, de Miranda Jm, B. T. Meadows, P. R. Burchat, and I. Bediaga
Subjects: Physics, Particle physics, Antiparticle, Muon, Meson, Neutral current, High Energy Physics::Phenomenology, General Physics and Astronomy, Nuclear physics, Pseudoscalar, High Energy Physics::Experiment, Vector meson, Charm (quantum number), Lepton
Abstract: We report results of a search for flavor-changing neutral current (FCNC), lepton flavor, and lepton-number violating decays of the ${D}^{0}$ (and its antiparticle) into three and four bodies. Using data from Fermilab charm hadroproduction experiment E791, we examine modes with two leptons (muons or electrons) and a ${\ensuremath{\rho}}^{0}$, ${\overline{K}}^{*0}$, or $\ensuremath{\varphi}$ vector meson or a nonresonant $\ensuremath{\pi}\ensuremath{\pi}$, $K\ensuremath{\pi}$, or $\mathrm{KK}$ pair of pseudoscalar mesons. No evidence for any of these decays is found. Therefore, we present branching-fraction upper limits at 90% confidence level for the 27 decay modes examined (18 new).
Published: 2001

39. 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

40. Study of theDs+→π−π+π+Decay and Measurement off0Masses and Widths

Author: G. F. Fox, D. J. Summers, K. Gounder, J. M. De Miranda, B. T. Meadows, M. D. Sokoloff, J. R. T. de Mello Neto, P.A. Kasper, S. B. Bracker, S. Radeztsky, S. Watanabe, J.J. Reidy, M. Sheaff, R. J. Stefanski, S. Devmal, R. A. Sidwell, S. Takach, B. Lundberg, I. Bediaga, C. Zhang, A. J. Slaughter, J. A. Appel, A. Napier, Daniel Ashery, K. Denisenko, P. Gagnon, A.M. Halling, D. Yi, K. C. Peng, H.S. Carvalho, S. M. Yang, A. Nguyen, A. Massafferri, H. A. Rubin, N. K. Copty, S. MayTal-Beck, R. Zaliznyak, Simon Kwan, S. Yoshida, A. K. Tripathi, D. C. Langs, M. V. Purohit, C. L. Darling, K. O'Shaughnessy, G. Blaylock, A.K.S. Santha, J. Solano, C. James, S. Amato, A.B. d'Oliveira, E.M. Aitala, Alberto Santoro, J. C. Anjos, N. W. Reay, J. Leslie, J. Magnin, D. A. Sanders, J. Wiener, L. Perera, D. Mihalcea, A. C. dos Reis, R. Weiss-Babai, A. Álvarez Fernández, L. M. Cremaldi, K. Thorne, Patricia R. Burchat, E. Wolin, S. Banerjee, N. Witchey, C. Göbel, A. J. Schwartz, R. H. Milburn, R. A. Burnstein, N. R. Stanton, A. Rafatian, G. Hurvits, Kevin Stenson, G. Herrera, T. Carter, and B. Quinn
Subjects: Physics, Crystallography, Particle physics, Pi, General Physics and Astronomy, Dalitz plot
Abstract: From a sample of $848\ifmmode\pm\else\textpm\fi{}44$ ${D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}$ decays, we find $\ensuremath{\Gamma}({D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+})/\ensuremath{\Gamma}({D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\varphi}{\ensuremath{\pi}}^{+})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.245\ifmmode\pm\else\textpm\fi{}{0.028}_{\ensuremath{-}0.012}^{+0.019}$. Using a Dalitz plot analysis of this three body decay, we find significant contributions from the channels ${\ensuremath{\rho}}^{0}(770){\ensuremath{\pi}}^{+}$, ${\ensuremath{\rho}}^{0}(1450){\ensuremath{\pi}}^{+}$, ${f}_{0}(980){\ensuremath{\pi}}^{+}$, ${f}_{2}(1270){\ensuremath{\pi}}^{+}$, and ${f}_{0}(1370){\ensuremath{\pi}}^{+}$. We also present the values obtained for masses and widths of the resonances ${f}_{0}(980)$ and ${f}_{0}(1370)$.
Published: 2001

41. Experimental Evidence for a Light and Broad Scalar Resonance inD+→π−π+π+Decay

Author: N. R. Stanton, N. Witchey, D.C. Langs, S. Radeztsky, S. MayTal-Beck, A. Nguyen, Alberto Santoro, Kevin Stenson, J. Magnin, A.K. Tripathi, A.M. Halling, D. J. Summers, K. Gounder, R. H. Milburn, I. Bediaga, C. Zhang, R. A. Burnstein, J. A. Appel, G. F. Fox, S. M. Yang, S. Yoshida, P.A. Kasper, J.J. Reidy, A. Massafferri, A. Rafatian, J. Wiener, R. J. Stefanski, G. Blaylock, A. Napier, H.S. Carvalho, B. Lundberg, de Miranda Jm, K. Denisenko, D. Yi, Sokoloff, N. W. Reay, J. Leslie, G. Hurvits, C. Göbel, S. Takach, S. Watanabe, R. Weiss-Babai, B. T. Meadows, Daniel Ashery, M. Sheaff, C. L. Darling, S. B. Bracker, D. A. Sanders, A. J. Schwartz, Simon Kwan, Sudeshna Banerjee, J. C. Anjos, T. Carter, G. Herrera, P. Gagnon, C. James, R. Zaliznyak, N. K. Copty, S. Amato, B. Quinn, H. A. Rubin, de Mello Neto, J. Solano, D. Mihalcea, A. J. Slaughter, M. V. Purohit, A.K.S. Santha, K. O'Shaughnessy, dos Reis Ac, S. Devmal, L.P. Perera, R. A. Sidwell, Patricia R. Burchat, A.B. d'Oliveira, E.M. Aitala, A. Álvarez Fernández, L. M. Cremaldi, E. Wolin, K. C. Peng, and K. Thorne
Subjects: Physics, Nuclear magnetic resonance, Amplitude, Scalar (mathematics), Analytical chemistry, Pi, General Physics and Astronomy, Dalitz plot, Resonance
Abstract: From a sample of 1172 +/- 61 D(+)-->pi(-)pi(+)pi(+) decays, we find gamma(D(+)-->pi(-)pi(+)pi(+))/gamma(D(+)-->K-pi(+)pi(+)) = 0.0311 +/- 0.0018(+0.0016)(-0.0026). Using a coherent amplitude analysis to fit the Dalitz plot of these decays, we find strong evidence that a scalar resonance of mass 478(+24)(-23) +/- 17 MeV/c(2) and width 324(+42)(-40) +/- 21 MeV/c(2) accounts for approximately half of all decays.
Published: 2001

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

Author: S. M. Yang, R. A. Burnstein, Kevin Stenson, S. Yoshida, A. Rafatian, C. Zhang, H.S. Carvalho, N. Witchey, M. V. Purohit, A. Nguyen, K. C. Peng, A.B. d'Oliveira, A. Fernandez, D.C. Langs, S. MayTal-Beck, B. Quinn, J. R. T. de Mello Neto, A.K.S. Santha, E.M. Aitala, A. Napier, K. Denisenko, D. Yi, R. Weiss-Babai, G. Hurvits, R. A. Sidwell, D. A. Sanders, R. J. Stefanski, N. K. Copty, A.K. Tripathi, I. Bediaga, G. Blaylock, K. Thorne, J. C. Anjos, A. J. Slaughter, T. Carter, L. M. Cremaldi, E. Wolin, D. Mihalcea, S. B. Bracker, N. R. Stanton, F.R.A. Simão, A. C. dos Reis, J. Magnin, A. J. Schwartz, C. L. Darling, J.J. Reidy, B. Lundberg, B. T. Meadows, R. Zaliznyak, M. Sheaff, M. D. Sokoloff, G. Herrera, P.A. Kasper, Sudeshna Banerjee, S. Devmal, P. R. Burchat, D. J. Summers, R. H. Milburn, L.P. Perera, K. Gounder, K. O'Shaughnessy, J. M. De Miranda, Alberto Santoro, J. Solano, Daniel Ashery, S. Amato, G. F. Fox, H. A. Rubin, S. Takach, S. Radeztsky, S. Watanabe, A.M. Halling, Simon Kwan, P. Gagnon, C. James, J. A. Appel, N. W. Reay, J. Leslie, J. Wiener, and C. Göbel
Subjects: Physics, Nuclear and High Energy Physics, media_common.quotation_subject, Lambda, Asymmetry, Baryon, Nuclear physics, symbols.namesake, Pi, symbols, Feynman diagram, Production (computer science), Fermilab, Nucleon, media_common
Abstract: We present a measurement of asymmetries in the production of Λ c + and Λ c − baryons in 500 GeV/ c π − -nucleon interactions from the E791 experiment at Fermilab. The asymmetries were measured as functions of Feynman x ( x F ) and transverse momentum squared ( p T 2 ) using a sample of 1 819±62 Λ c 's observed in the decay channel Λ c + → pK − π + . We observe more Λ c + than Λ c − baryons, with an asymmetry of (12.7±3.4±1.3)% independent of x F and p T 2 in our kinematical range (−0.1⩽ x F ⩽0.6 and 0.0⩽ p T 2 ⩽8.0 (GeV/ c ) 2 ). This Λ c asymmetry measurement is the first with data in both the positive and negative x F regions.
Published: 2000

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

Author: J. A. Appel, Michael Sokoloff, K. O'Shaughnessy, A. Napier, P.A. Kasper, A.B. d'Oliveira, E.M. Aitala, K. Denisenko, D. Yi, R. Weiss-Babai, C. James, R. Zaliznyak, S. Devmal, B. Quinn, G. Blaylock, A.J. Slaughter, A. J. Schwartz, C. L. Darling, S. Takach, A. Rafatian, L.P. Perera, K. C. Peng, S. B. Bracker, N. Witchey, J. R. T. de Mello Neto, J. Wiener, J.J. Reidy, G. Hurvits, Milind Purohit, I. Bediaga, Don Summers, A. Fernandez, D.C. Langs, R. A. Sidwell, B. Lundberg, C. Göbel, C. Zhang, A.K.S. Santha, L. M. Cremaldi, D. Ashery, E. Wolin, A. Nguyen, S. MayTal-Beck, H. A. Rubin, Kevin Stenson, M. Sheaff, N. R. Stanton, J. C. Anjos, T. Carter, A.K. Tripathi, R. H. Milburn, Alberto Santoro, F.R.A. Simão, N. K. Copty, Brian Meadows, Patricia R. Burchat, A. C. dos Reis, K. Thorne, J. Solano, G. Herrera, S. Yoshida, H.S. Carvalho, N. W. Reay, J. Leslie, Simon Kwan, David Sanders, P. Gagnon, K. Gounder, J. M. De Miranda, S. Radeztsky, A.M. Halling, J. Magnin, R.A. Burnstein, Sudeshna Banerjee, S. Amato, G. F. Fox, and S. Watanabe
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, media_common.quotation_subject, Astrophysics::Cosmology and Extragalactic Astrophysics, Asymmetry, Nuclear physics, Baryon, symbols.namesake, Transverse momentum, symbols, Feynman diagram, High Energy Physics::Experiment, Fermilab, Nuclear Experiment, Nucleon, media_common
Abstract: We present a measurement of asymmetries in the production of Λc+ and Λc− baryons in 500 GeV/c π−-nucleon interactions from the E791 experiment at Fermilab. The asymmetries were measured as functions of Feynman x (xF) and transverse momentum squared (pT2) using a sample of 1 819±62 Λc's observed in the decay channel Λc+→pK−π+. We observe more Λc+ than Λc− baryons, with an asymmetry of (12.7±3.4±1.3)% independent of xF and pT2 in our kinematical range (−0.1⩽xF⩽0.6 and 0.0⩽pT2⩽8.0 (GeV/c)2). This Λc asymmetry measurement is the first with data in both the positive and negative xF regions.
Published: 2000

44. Correlations between D and $${\overline D}$$ mesons produced in 500 GeV/cπ−-nucleon interactions

Author: D. Ashery, Patricia R. Burchat, S. Radeztsky, K. O'Shaughnessy, J. A. Appel, J.J. Reidy, H.S. Carvalho, A.M. Halling, K. Gounder, J. M. De Miranda, B. Lundberg, A.B. d'Oliveira, David Sanders, C. Göbel, E.M. Aitala, K. C. Peng, Kevin Stenson, G. Blaylock, Don Summers, C.J. Solano Salinas, L.P. Perera, R.A. Burnstein, K. Thorne, S. Takach, Milind Purohit, I. Bediaga, Sudeshna Banerjee, S. MayTal-Beck, L. M. Cremaldi, E. Wolin, J. R. T. de Mello Neto, A.K.S. Santha, A. Napier, K. Denisenko, S. Amato, D. Yi, A.J. Slaughter, A.K. Tripathi, R. Weiss-Babai, G. F. Fox, J. C. Anjos, H. A. Rubin, D. Mihalcea, R. A. Sidwell, S. Watanabe, A. Nguyen, B. Quinn, S. M. Yang, C. Zhang, A. C. dos Reis, R. J. Stefanski, S. Yoshida, T. Carter, N. Witchey, A. Fernandez, D.C. Langs, M. Sheaff, Sokoloff, N. K. Copty, N. R. Stanton, C. James, Stephen B. Bracker, J. Wiener, R. Zaliznyak, P.A. Kasper, Simon Kwan, P. Gagnon, N. W. Reay, J. Leslie, C. L. Darling, A. Rafatian, G. Hurvits, Alberto Santoro, Brian Meadows, R. H. Milburn, A. J. Schwartz, and G. Herrera
Subjects: Physics, Quantum chromodynamics, Particle physics, Meson, High Energy Physics::Phenomenology, Order (ring theory), Nuclear physics, D meson, High Energy Physics::Experiment, Production (computer science), Charm (quantum number), Nuclear Experiment, Nucleon, Event generator
Abstract: We present a study of correlations between D and $${\overline D}$$ mesons produced in 500 GeV/cπ−-nucleon interactions, based on data from experiment E791 at Fermilab. We have fully reconstructed 791 ± 44 charm meson pairs to study correlations between the transverse and longitudinal momenta of the two D mesons and the relative production rates for different types of D meson pairs. We see slight correlations between the longitudinal momenta of the D and the $${\bar D}$$ , and significant correlations between the azimuthal angle of the D and the $${\bar D}$$ . The experimental distributions are compared to a next-to-leading-order QCD calculation and to predictions of the PYTHIA/JETSET Monte Carlo event generator. We observe less correlation between transverse momenta and different correlations between longitudinal momenta than these models predict for the default values of the model parameters. Better agreement between data and theory might be achieved by tuning the model parameters or by adding higher order perturbative terms, thus contributing to a better understanding of charm production. The relative production rates for the four sets of charm pairs, $$D^0{{\overline D}^0}, D^0 D^{-}, D^+{{\overline D}^0}, D^+ D^{-}$$ as calculated in the PYTHIA/JETSET event generator with the default parameters, agree with data as far as the relative ordering, but predict too many $$D^+ {{\overline D}^0}$$ pairs and too few $$D^+ D^{-}$$ pairs.
Published: 2000

45. 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

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

Author: E.M. Aitala, S. Amato, J.C. Anjos, J.A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S.B. Bracker, P.R. Burchat, R.A. Burnstein, T. Carter, H.S. Carvalho, N.K. Copty, L.M. Cremaldi, C. Darling, K. Denisenko, S. Devmal, A. Fernandez, G.F. Fox, P. Gagnon, C. Gobel, K. Gounder, A.M. Halling, G. Herrera, G. Hurvits, C. James, P.A. Kasper, S. Kwan, D.C. Langs, J. Leslie, B. Lundberg, J. Magnin, S. MayTal-Beck, B. Meadows, J.R.T. de Mello Neto, D. Mihalcea, R.H. Milburn, J.M. de Miranda, A. Napier, A. Nguyen, A.B. d'Oliveira, K. O'Shaughnessy, K.C. Peng, L.P. Perera, M.V. Purohit, B. Quinn, S. Radeztsky, A. Rafatian, N.W. Reay, J.J. Reidy, A.C. dos Reis, H.A. Rubin, D.A. Sanders, A.K.S. Santha, A.F.S. Santoro, A.J. Schwartz, M. Sheaff, R.A. Sidwell, A.J. Slaughter, M.D. Sokoloff, J. Solano, N.R. Stanton, R.J. Stefanski, K. Stenson, D.J. Summers, S. Takach, K. Thorne, A.K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, S.M. Yang, D. Yi, S. Yoshida, R. Zaliznyak, and C. Zhang
Subjects: Baryon, Physics, Nuclear and High Energy Physics, Particle physics, Amplitude, Resonance analysis, Pi, Resonance, Lambda, Bar (unit)
Abstract: We present the results of a five-dimensional resonant amplitude analysis of the $\Lambda_c^+{\to}pK^{-}\pi^{+}$ system based on $946\pm 38$ reconstructed decays. These data were produced in 500 GeV/$c$ $\pi^-$-N interactions by Fermilab experiment E791. We report measurements of the amplitudes for $\Lambda_c^+$ decay into nonresonant $pK^-\pi^+$ and to $p\bar{K}^{*0}(890)$, $\Delta^{++}(1232)K^-$, and $\Lambda(1520)\pi^+$ and we comment on other possible resonant enhancements. This is the first complete amplitude analysis of the $\Lambda_c^{+}{\to}pK^{-}\pi^{+}$ system. We find that $(54.8\pm5.5\pm3.5)$% of the decays are nonresonant, $(19.5\pm2.6\pm1.8)$% of the decays are via the $\bar{K}^{*0}$ resonance, $(18.0\pm2.9\pm2.9)$% of the decays are via the $\Delta^{++}$ resonance, and $(7.7\pm1.8\pm1.1)$% of the decays are via the $\Lambda(1520)$ resonance. We find evidence for an increasingly negative polarization of the $\Lambda_c^+$ baryons as a function of $p_T^2$, in agreement with a recent model\cite{dha} and with a related measurement\cite{jez}.
Published: 2000

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

Author: E.M. Aitala, S. Amato, J.C. Anjos, J.A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S.B. Bracker, P.R. Burchat, R.A. Burnstein, T. Carter, H.S. Carvalho, N.K. Copty, L.M. Cremaldi, C. Darling, K. Denisenko, A. Fernandez, G.F. Fox, P. Gagnon, C. Gobel, K. Gounder, A.M. Halling, G. Herrera, G. Hurvits, C. James, P.A. Kasper, S. Kwan, D.C. Langs, J. Leslie, B. Lundberg, S. MayTal-Beck, B. Meadows, J.R.T. de Mello Neto, D. Mihalcea, R.H. Milburn, J.M. de Miranda, A. Napier, A. Nguyen, A.B. d'Oliveira, K. O'Shaughnessy, K.C. Peng, L.P. Perera, M.V. Purohit, B. Quinn, S. Radeztsky, A. Rafatian, N.W. Reay, J.J. Reidy, A.C. dos Reis, H.A. Rubin, D.A. Sanders, A.K.S. Santha, A.F.S. Santoro, A.J. Schwartz, M. Sheaff, R.A. Sidwell, A.J. Slaughter, M.D. Sokoloff, J. Solano, N.R. Stanton, R.J. Stefanski, K. Stenson, D.J. Summers, S. Takach, K. Thorne, A.K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, S.M. Yang, D. Yi, S. Yoshida, R. Zaliznyak, and C. Zhang
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Electron channel, Form factor (quantum field theory), Lepton
Abstract: We have measured the form factor ratios r_V = V(0)/A_1(0) and r_2 = A_2(0)/A_1(0) for the decay D_s^+ -> phi ell^+ nu_ell, phi -> K^+ K^-, using data from charm hadroproduction experiment E791 at Fermilab. Results are based on 144 signal and 22 background events in the electron channel and 127 signal and 34 background events in the muon channel. We combine the measurements from both lepton channels to obtain r_V = 2.27 +- 0.35 +- 0.22 and r_2 = 1.57 +- 0.25 +- 0.19.
Published: 1999

48. Search for the pentaquark via the decay

Author: R. Zaliznyak, Sudeshna Banerjee, A. Napier, K. Denisenko, T. Carter, J.J. Reidy, D. Yi, J. A. Appel, R. Weiss-Babai, S. Takach, L.P. Perera, A. J. Schwartz, S. Amato, S. Radeztsky, Simon Kwan, G. F. Fox, P.A. Kasper, N. Witchey, S. M. Yang, L. M. Cremaldi, I. Bediaga, E. Wolin, S. MayTal-Beck, A. Fernandez, S. Yoshida, D.C. Langs, S. Gerzon, A.K. Tripathi, G. Herrera, J. Lichtenstadt, S. Watanabe, D. J. Summers, K. Gounder, P. Gagnon, J. M. De Miranda, A. J. Slaughter, B. T. Meadows, M. D. Sokoloff, P. R. Burchat, K. O'Shaughnessy, Kevin Stenson, R. A. Sidwell, R. J. Stefanski, N. W. Reay, J. Leslie, S. B. Bracker, Alberto Santoro, B. Quinn, M. V. Purohit, A.M. Halling, J. C. Anjos, H.S. Carvalho, D. Mihalcea, A.K.S. Santha, J. R. T. de Mello Neto, E.M. Aitala, K. C. Peng, Daniel Ashery, R. A. Burnstein, B. Lundberg, A. C. dos Reis, A. Rafatian, G. Hurvits, H. A. Rubin, N. K. Copty, J. Solano, J. Wiener, C. Göbel, C. Zhang, C. James, M. Sheaff, A. Nguyen, D. A. Sanders, K. Thorne, G. Blaylock, R. H. Milburn, N. R. Stanton, A. B. D'Oliveira, and C. L. Darling
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Cross section (physics), Particle physics, Branching fraction, Fermilab, Beam (structure), Pentaquark
Abstract: We have searched for evidence of the production and decay of a neutral bound-state pentaquark, one of a predicted doublet of states: P 0 c s =| c suud〉 and P − c s =| c sddu〉 . Specifically, we have searched for the decay P 0 c s →K ∗0 K − p in data from Fermilab experiment E791, in which a 500 GeV/c π− beam interacted with nuclear targets. We find mass-dependent upper limits at the 90% confidence level for the ratio of cross section times branching fraction of this decay relative to that for the decay D s − →K ∗0 K − . The upper limits vary between 0.016 and 0.036 for M(P 0 c s ) between 2.75 and 2.91 GeV/c2, assuming a pentaquark lifetime of 0.4 ps.
Published: 1999

49. Measurement of the Ds lifetime

Author: E.M. Aitala, S. Amato, J.C. Anjos, J.A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S.B. Bracker, P.R. Burchat, R.A. Burnstein, T. Carter, H.S. Carvalho, N.K. Copty, L.M. Cremaldi, C. Darling, K. Denisenko, A. Fernandez, G.F. Fox, P. Gagnon, C. Gobel, K. Gounder, A.M. Halling, G. Herrera, G. Hurvits, C. James, P.A. Kasper, S. Kwan, D.C. Langs, J. Leslie, B. Lundberg, S. MayTal-Beck, B. Meadows, J.R.T. de Mello Neto, D. Mihalcea, R.H. Milburn, J.M. de Miranda, A. Napier, A. Nguyen, A.B. d'Oliveira, K. O'Shaughnessy, K.C. Peng, L.P. Perera, M.V. Purohit, B. Quinn, S. Radeztsky, A. Rafatian, N.W. Reay, J.J. Reidy, A.C. dos Reis, H.A. Rubin, D.A. Sanders, A.K.S. Santha, A.F.S. Santoro, A.J. Schwartz, M. Sheaff, R.A. Sidwell, A.J. Slaughter, M.D. Sokoloff, J. Solano, N.R. Stanton, R.J. Stefanski, K. Stenson, D.J. Summers, S. Takach, K. Thorne, A.K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, S.M. Yang, D. Yi, S. Yoshida, R. Zaliznyak, and C. Zhang
Subjects: Physics, High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, Particle physics, Meson, Maximum likelihood, FOS: Physical sciences, Charm (quantum number), Fermilab, Measure (mathematics), Standard deviation, High Energy Physics - Experiment
Abstract: We report the results of a precise measurement of the Ds meson lifetime based on 1662 +/- 56 fully reconstructed Ds -> phi pi decays, from the charm hadroproduction experiment E791 at Fermilab. Using an unbinned maximum likelihood fit, we measure the Ds lifetime to be 0.518 +/- 0.014 +/- 0.007 ps. The ratio of the measured Ds lifetime to the world average D0 lifetime is 1.25 +/- 0.04. This result differs from unity by six standard deviations, indicating significantly different lifetimes for the Ds and the D0., 12 pages, 3 figures, 2 table. LaTeX
Published: 1999

50. Measurement of the form-factor ratios for D→ℓν

Author: N. R. Stanton, S. Takach, A. Napier, K. Denisenko, D. Yi, R. Weiss-Babai, B. Lundberg, S. B. Bracker, S. M. Yang, S. Radeztsky, G. Blaylock, R. Zaliznyak, K. C. Peng, S. Yoshida, J.J. Reidy, Simon Kwan, J. R. T. de Mello Neto, R. H. Milburn, A.B. d'Oliveira, E.M. Aitala, P.A. Kasper, C. Zhang, D. C. Langs, D. J. Summers, K. Gounder, B. T. Meadows, A. Álvarez Fernández, J. M. De Miranda, Kevin Stenson, M. D. Sokoloff, L. M. Cremaldi, E. Wolin, S. MayTal-Beck, S. Amato, R. J. Stefanski, Pauline Gagnon, N. K. Copty, A. J. Slaughter, T. Carter, A. Nguyen, J. Wiener, R. A. Sidwell, S. Banerjee, C. Göbel, D. Mihalcea, C. James, A.M. Halling, J. A. Appel, A. C. dos Reis, M. V. Purohit, J. Solano, G. F. Fox, B. Quinn, D. A. Sanders, Daniel Ashery, I. Bediaga, A.K.S. Santha, S. Watanabe, N. W. Reay, J. Leslie, L. Perera, N. Witchey, C. L. Darling, K. Thorne, Patricia R. Burchat, R. A. Burnstein, A. Rafatian, G. Hurvits, K. O'Shaughnessy, Alberto Santoro, M. Sheaff, H. A. Rubin, H.S. Carvalho, J. C. Anjos, A. J. Schwartz, G. Herrera, and A. K. Tripathi
Subjects: Physics, Nuclear and High Energy Physics, chemistry, Analytical chemistry, chemistry.chemical_element, Platinum, Carbon
Published: 1998

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