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1. Observation of a narrow state decaying into Ξ0π+

Author

C. J. Kennedy, F. Prelz, P. H. Garbincius, Robert Gardner, V. Arena, P. M. Yager, Germano Bonomi, Y. Zhang, I. Gaines, E. Meroni, S. S. Myung, F. L. Fabbri, A. Mirles, C. Rivera, J. F. Ginkel, N. M. Cason, Sandra Malvezzi, J. N. Butler, K. Y. Kim, M. S. Nehring, B. Gobbi, G. N. Kim, Daniele Pedrini, T. Handler, E. Gottschalk, L. A. Garren, James R. Wilson, Randy Ruchti, P. Inzani, A. Zallo, S. P. Ratti, E. Ramirez, D. Claes, S. Shukla, C. Castoldi, A. Rahimi, L. Milazzo, F. Leveraro, S. Sarwar, K. B. Lee, D. J. Harding, E. Montiel, D. L. Puseljic, J. S. Kang, R. Culbertson, Marco Giammarchi, B. O'Reilly, J. M. Link, Harry Cheung, C. Dallapiccola, D. Olaya, Paolo Dini, S. Cihangir, D. Torretta, M. Hosack, G. Alimonti, M. Boschini, A. E. Kreymer, P. Lebrun, W. D. Shephard, Stefano Bianco, Cristina Riccardi, L. Mendez, James E Wiss, Paul Sheldon, W. E. Johns, M. Di Corato, Gabriele Gianini, K. S. Park, John Perry Cumalat, L. Cinquini, Dario Menasce, F. Davenport, J. M. Bishop, J. Gao, Paolo Vitulo, Stephen A. Gourlay, R. Greene, J. A. Swiatek, M. M. Merlo, P. L. Frabetti, Y. S. Chung, A. Sala, D. Brambilla, K. Danyo, G. Boca, V. Paolone, Alan D. Lopez, S. Sala, D. Buchholz, L. Perasso, P. H. Kasper, T. F. Lin, C. Cawlfield, Z. Y. Wu, B. G. Cheon, M. Vittone, B. Caccianiga, G. Bellini, E. W. Vaandering, Luigi Moroni, L. Viola, and K. Cho

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, chemistry, chemistry.chemical_element, State (functional analysis), Beryllium, Atomic physics
Abstract

We report the observation of the Ξ c ∗+ state decaying into Ξc0π+ with Ξ c 0 →Λ K 0 π + π − or ΛK−π+π+π−. We have observed 47±11 candidate events for the Ξ c ∗+ state and measured its mass to be 177.1±0.5±1.1 MeV/ c 2 above the Ξc0 mass. We have also measured the Ξc0 mass to be 2470.0±2.8±2.6 MeV/ c 2 .

Published
1998

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

Author

S. Shukla, W. D. Shephard, Stefano Bianco, Cristina Riccardi, L. Perasso, James R. Wilson, E. Gottschalk, L. A. Garren, Randy Ruchti, B. Gobbi, D. L. Puseljic, P. Inzani, A. Zallo, Kisoo Lee, Harry Cheung, C. Rivera, V. Arena, C. Dallapiccola, Germano Bonomi, V. Paolone, Gabriele Gianini, K. S. Park, J. F. Ginkel, Y. Zhang, C. J. Kennedy, S. Cihangir, R. Culbertson, N. M. Cason, M. Vittone, Marco Giammarchi, C. Castoldi, D. J. Harding, Alan D. Lopez, M. S. Nehring, F. Prelz, E. Meroni, T. F. Lin, T. Handler, Luigi Moroni, J. N. Butler, S. Sarwar, F. Leveraro, M. Boschini, J. Cao, G. Alimonti, P. M. Yager, A. E. Kreymer, P. Lebrun, J. M. Link, A. Rahimi, B. O'Reilly, Dario Menasce, M. Di Corato, D. Olaya, John Perry Cumalat, Paolo Dini, M. Hosack, Paul Sheldon, W. E. Johns, Fabrizio Fabbri, I. Gaines, Robert Gardner, L. Mendez, D. Buchholz, B. Caccianiga, L. Cinquini, G. N. Kim, P. H. Garbincius, D. Brambilla, E. Ramirez, J. S. Kang, P. H. Kasper, J. M. Bishop, K. Danyo, L. Milazzo, J. A. Swiatek, G. Boca, G. Bellini, K. Y. Kim, E. W. Vaandering, James E Wiss, L. Viola, C. Cawlfield, K. Cho, Daniele Pedrini, Z. Y. Wu, S. Sala, D. Claes, B. G. Cheon, A. Mirles, Richard L. Greene, D. Torretta, S. P. Ratti, Paolo Vitulo, S. S. Myung, Sandra Malvezzi, P. L. Frabetti, E. Montiel, F. Davenport, Stephen A. Gourlay, M. M. Merlo, Y. S. Chung, and A. Sala

Subjects
Physics, Nuclear physics, Hadronic decay, Nuclear and High Energy Physics, High energy, chemistry, Mass spectrum, chemistry.chemical_element, Fermilab, Atomic physics, Beryllium
Abstract

New measurements of the lifetime and mass of the Ξ c + are presented. The Ξ c + has been reconstructed through the two decay channels Ξ − π + π + and Σ + K − π + . The data were accumulated by the Fermilab high energy photoproduction experiment E687. The lifetime is measured to be 0.34 +0.07 −0.05 (stat.)±0.02 (syst.) ps while the mass is measured to be 2465.8±1.9 (stat.)±2.5 (syst.) MeV/c 2 .

Published
1998

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

Author

C. Rivera, J. F. Ginkel, L. Mendez, R. Greene, G. Bellini, E. W. Vaandering, J. N. Butler, S. S. Myung, Luigi Moroni, John Perry Cumalat, C. J. Kennedy, A. Zallo, L. Perasso, F. Davenport, T. Handler, E. Meroni, G. P. Grim, Gianluca Alimonti, N. M. Cason, Z. Y. Wu, P. M. Yager, Sandra Malvezzi, J. S. Kang, P. L. Frabetti, Stephen A. Gourlay, Paul Sheldon, L. Cinquini, L. Milazzo, D. J. Harding, B. G. Cheon, B. Caccianiga, M. M. Merlo, J. M. Bishop, R. Culbertson, Dario Menasce, F. Prelz, W. E. Johns, B. O'Reilly, I. Gaines, L. Viola, Marco Giammarchi, A. E. Kreymer, P. Lebrun, S. P. Ratti, J. M. Link, M. Vittone, E. Ramirez, D. Brambilla, Paolo Dini, M. Boschini, P. H. Garbincius, S. Sarwar, K. Danyo, Germano Bonomi, D. Olaya, M. Hosack, B. Gobbi, Y. S. Chung, M. Di Corato, K. Y. Kim, G. Boca, F. L. Fabbri, V. Arena, Robert Gardner, Y. Zhang, Paolo Vitulo, Gabriele Gianini, W. D. Shephard, Stefano Bianco, J. Hughes, Cristina Riccardi, D. Buchholz, M. S. Nehring, J. A. Swiatek, Daniele Pedrini, G. N. Kim, P. Inzani, James R. Wilson, K. B. Lee, D. Claes, D. L. Puseljic, A. Sala, James E Wiss, F. Leveraro, C. Castoldi, D. Torretta, Harry Cheung, P. H. Kasper, A. Rahimi, V. Paolone, Alan D. Lopez, C. Dallapiccola, S. Sala, T. F. Lin, C. Cawlfield, J. Cao, S. Shukla, L. A. Garren, E. Montiel, Randy Ruchti, and S. Cihangir

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Amplitude, Dalitz plot, Fermilab
Abstract

An amplitude analysis of the D+, Ds+ → π−π+π+ Dalitz plots is presented using data collected by the Fermilab high-energy photoproduction experiment E687. The data are fitted to a model consisting of a sum of relativistic Breit-Wigner amplitudes for the intermediate two-body resonant decay modes plus a flat non-resonant contribution. From the fit we derive decay fractions and relative phases. We also present measurements of Γ(D + →π − π + π + ) Γ(D + →K − π + π + ) and Γ(D s + →π − π + π + ) Γ(D s + →K − K + π + ) .

Published
1997

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

Author

J. F. Ginkel, G. Bellini, S. Cihangir, V. Arena, D. Buchholz, J. R. Wilson, A. Lopeze, D. Brambilla, K. Danyo, G. Boca, N. M. Cason, James E Wiss, F. Leveraro, R. Culbertson, Gianluca Alimonti, M. Vittone, Marco Giammarchi, R. Greene, P. H. Kasper, S. Sarwar, B. Gobbi, D. L. Puseljic, A. Sala, V. Paolone, I. Gaines, Fabrizio Fabbri, C. Dallapiccola, L. Perasso, M. Boschini, B. O'Reilly, S. Shukla, Harry Cheung, P. H. Garbincius, M. Gullotta, G. N. Kim, Z. Y. Wu, T. Handler, Sandra Malvezzi, Daniele Pedrini, P. L. Frabetti, B. Caccianiga, W. D. Shephard, Stefano Bianco, Dario Menasce, C. J. Kennedy, A. E. Kreymer, P. Lebrun, L. A. Garren, Cristina Riccardi, W. E. Johns, B. G. Cheon, F. Prelz, Randy Ruchti, Paolo Vitulo, P. Inzani, D. Claes, K. Y. Kim, E. Meroni, G. P. Grim, P. M. Yager, M. Di Corato, C. Castoldi, J. S. Kang, D. Torretta, S. P. Ratti, John Perry Cumalat, L. Cinquini, J. M. Bishop, M. S. Nehring, F. Davenport, Stephen A. Gourlay, D. J. Harding, A. Zallo, Gabriele Gianini, L. Viola, S. Sala, T. F. Lin, Luigi Moroni, Robert Gardner, J. A. Swiatek, Paul Sheldon, and J. N. Butler

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Meson, Hadron, Fermilab
Abstract

Charged hadronic five-body decays of D + and D s + mesons have been studied in the E687 photoproduction experiment at Fermilab. We report the first compelling evidence of the decay mode D + , D s + → π − π − β + π + π + and the measurements of the decays D + → K − π − π + π + π + , D s + → K − K + π − π + π + and D s + → φπ − π + π + . An analysis of the D + → K − π − π + π + π + resonance structure is also presented.

Published
1997

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

Author

S. Cihangir, A. Rahimi, John Perry Cumalat, C. Castoldi, J. Hughes, T. Handler, L. Milazzo, L. Cinquini, S. S. Myung, D. Brambilla, A. E. Kreymer, P. Lebrun, K. Danyo, L. A. Garren, Randy Ruchti, S. Shukla, W. E. Johns, Luigi Moroni, J. N. Butler, G. Boca, M. Di Corato, Daniele Pedrini, J. M. Bishop, T. F. Lin, Sandra Malvezzi, P. L. Frabetti, M. Boschini, E. Ramirez, J. Cao, R. Greene, P. Inzani, D. Claes, P. H. Garbincius, Dario Menasce, F. Prelz, K. Y. Kim, J. R. Wilson, J. M. Link, C. Dallapiccola, F. Davenport, G. N. Kim, D. Olaya, S. Sala, G. Bellini, D. Buchholz, D. L. Puseljic, A. Sala, E. W. Vaandering, Robert Gardner, D. Torretta, L. Perasso, Harry Cheung, A. Zallo, M. S. Nehring, Kisoo Lee, F. Leveraro, R. Culbertson, P. H. Kasper, Marco Giammarchi, Z. Y. Wu, Stephen A. Gourlay, C. J. Kennedy, N. M. Cason, M. M. Merlo, B. G. Cheon, S. P. Ratti, C. Cawlfield, J. A. Swiatek, B. O'Reilly, Paul Sheldon, L. Méndez, I. Gaines, Alan D. Lopez, Gabriele Gianini, Paolo Dini, B. Gobbi, W. D. Shephard, Stefano Bianco, M. Hosack, C. Rivera, M. Vittone, V. Arena, Y. S. Chung, Cristina Riccardi, J. F. Ginkel, L. Viola, P. M. Yager, D. J. Harding, E. Montiel, Fabrizio Fabbri, James E Wiss, S. Sarwar, Germano Bonomi, E. Meroni, G. P. Grim, Y. Zhang, Gianluca Alimonti, J. S. Kang, V. S. Paolone, B. Caccianiga, and Paolo Vitulo

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Flavor-changing neutral current, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Fermilab, Lepton number, Lepton
Abstract

We report on the results of a search for fourteen flavor changing neutral current, lepton number violating, or lepton family number violating decays of the charmed meson D + in the large charm sample recorded by the Fermilab photoproduction experiment E687. No evidence is seen for these rare and standard-model-forbidden decays, of the form D + → h ± l ∓ l + (with h = π , K and l = e , μ ); we determine 90% confidence level upper limits on their absolute branching fractions in the range (9–20) × 10 −5 .

Published
1997

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

Author

Daniele Pedrini, N. M. Cason, V. S. Paolone, S. Cihangir, C. J. Kennedy, D. Claes, P. M. Yager, B. O'Reilly, R. Culbertson, Marco Giammarchi, Dario Menasce, R. Greene, M. Boschini, Paolo Vitulo, B. Gobbi, E. Meroni, G. P. Grim, Paul Sheldon, W. E. Johns, D. Brambilla, K. Danyo, J. S. Kang, S. Shukla, F. Leveraro, G. Boca, T. F. Lin, L. Viola, V. Arena, K. Y. Kim, S. Sala, L. A. Garren, Robert Gardner, Randy Ruchti, J. A. Swiatek, James E Wiss, James R. Wilson, Luigi Moroni, A. Sala, F. L. Fabbri, M. S. Nehring, D. J. Harding, F. Davenport, Gabriele Gianini, S. P. Ratti, Stephen A. Gourlay, P. Inzani, A. Zallo, I. Gaines, J. F. Ginkel, John Perry Cumalat, L. Cinquini, J. M. Bishop, J. N. Butler, P. H. Garbincius, G. Alimonti, A. E. Kreymer, C. Dallapiccola, P. Lebrun, Z. Y. Wu, M. Di Corato, B. G. Cheon, G. N. Kim, M. Vittone, Sandra Malvezzi, C. Castoldi, W. D. Shephard, Stefano Bianco, D. Buchholz, P. L. Frabetti, B. Caccianiga, Cristina Riccardi, G. Bellini, L. Perasso, P. H. Kasper, S. Sarwar, D. L. Puseljic, Alan D. Lopez, Harry Cheung, F. Prelz, D. Torretta, and T. Handler

Subjects
Semileptonic decay, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, Vector meson, Fermilab, Measure (mathematics)
Abstract

We report on the first statistically significant observation of the vector meson Cabibbo suppressed semileptonic decay D+ → ρ0μ+ν. We measure the branching ratio of the decay mode D+ → ρ0μ+ν (plus possible unobserved γ from D+ → η′μ+ν, η′ → γρ0) with respect to the decay mode D + → K ∗0 μ + ν to be BR (D + → ρ 0 μ + ν) BR (D + → K ∗0 μ + ν) = 0.079 ± 0.019 ( stat ) ± 0.013 ( syst ) . Data were collected by Fermilab photoproduction experiment E687.

Published
1997

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

Author

D. L. Puseljic, C. Castoldi, V. Arena, Harry Cheung, G. R. Blackett, D. J. Harding, Z. Y. Wu, N. M. Cason, B. Gobbi, Paolo Vitulo, S. Cihangir, B. G. Cheon, F. Prelz, James E Wiss, T. F. Lin, V. S. Paolone, F. Davenport, W. D. Shephard, Stefano Bianco, F. L. Fabbri, M. Vittone, C. J. Kennedy, G. N. Kim, D. Torretta, Dario Menasce, Cristina Riccardi, L. Perasso, Alan D. Lopez, S. Shukla, R. Culbertson, P. M. Yager, Marco Giammarchi, B. O'Reilly, G. Alimonti, A. E. Kreymer, P. Inzani, John Perry Cumalat, P. Lebrun, A. Zallo, L. Cinquini, S. Sala, Daniele Pedrini, M. Pisharody, M. Di Corato, D. Buchholz, M. S. Nehring, B. Caccianiga, J. M. Bishop, M. Boschini, L. A. Garren, P. H. Kasper, D. Claes, Gabriele Gianini, S. Sarwar, F. Leveraro, W. E. Johns, Randy Ruchti, Paul Sheldon, G. Bellini, J. S. Kang, James R. Wilson, K. Y. Kim, E. Meroni, G. P. Grim, Sandra Malvezzi, P. L. Frabetti, R. Greene, D. Brambilla, K. Danyo, G. Boca, Stephen A. Gourlay, A. Sala, J. F. Ginkel, J. N. Butler, P. H. Garbincius, S. P. Ratti, I. Gaines, Luigi Moroni, T. Handler, L. Viola, C. Dallapiccola, Robert Gardner, and J. A. Swiatek

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Muon, Branching fraction, Analytical chemistry, Electron, Fermilab
Abstract

Results for the Cabibbo suppressed semileptonic decays D 0 → π − e + ν and D 0 → π − μ + ν (charge conjugates are implied) are reported by Fermilab photoproduction experiment E687. We find 45.4 ± 13.3 events in the electron mode and 45.6 ± 11.8 in the muon mode. The relative branching ratio BR (D 0 →π − l + v) BR (D 0 →K − l + v) for the combined sample is measured to be 0.101 ± 0.020 (stat.) ± 0.003 (syst.) 14 .

Published
1996

8. Charm-anticharm asymmetries in high energy photoproduction

Author

G. N. Kim, J. S. Kang, I. Gaines, S. Shukla, C. Castoldi, S. P. Ratti, S. Sarwar, Sandra Malvezzi, Paolo Vitulo, B. O'Reilly, T. Handler, D. L. Puseljic, A. Sala, P. L. Frabetti, Dario Menasce, John Perry Cumalat, W. E. Johns, Byung Gu Cheon, B. Gobbi, V. S. Paolone, F. Davenport, Harry Cheung, F. Prelz, L. Cinquini, James E Wiss, Daniele Pedrini, P. Inzani, M. Pisharody, D. Claes, L. A. Garren, J. M. Bishop, B. Caccianiga, E. Meroni, G. P. Grim, J. F. Ginkel, Randy Ruchti, S. Cihangir, J. R. Wilson, V. Arena, Alan D. Lopez, W. D. Shephard, Stefano Bianco, Cristina Riccardi, A. E. Kreymer, Gabriele Gianini, P. Lebrun, M. Boschini, M. S. Nehring, P. H. Garbincius, Paul Sheldon, N. M. Cason, R. Culbertson, M. Di Corato, Marco Giammarchi, D. J. Harding, Gianluca Alimonti, Stephen A. Gourlay, L. Perasso, C. Dallapiccola, K. Y. Kim, A. Zallo, G. R. Blackett, D. Buchholz, P. H. Kasper, F. Leveraro, D. Torretta, J. N. Butler, S. Sala, T. F. Lin, C. J. Kennedy, P. M. Yager, M. Vittone, Fabrizio Fabbri, R. Greene, Luigi Moroni, G. Bellini, L. Viola, Robert Gardner, J. A. Swiatek, Z. Y. Wu, D. Brambilla, K. Danyo, and G. Boca

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

We report measurements of charm particle production asymmetries from the Fermilab photoproduction experiment E687. An asymmetry in the rate of production of charm versus anticharm particles is expected to arise primarily from fragmentation effects. We observe statistically significant asymmetries in the photoproduction of D+, D ∗+ and D0 mesons and find small (but statistically weak) asymmetries in the production of the Ds+ meson and the Λc+ baryon. Our inclusive photoproduction asymmetries are compared to predictions from nonperturbative models of charm quark fragmentation.

Published
1996

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

Author

B. O'Reilly, T. F. Lin, V. S. Paolone, F. Davenport, R. Greene, W. E. Johns, Sandra Malvezzi, C. Castoldi, B. Caccianiga, P. L. Frabetti, D. Buchholz, B. Gobbi, Z. Y. Wu, Dario Menasce, P. Lebrun, Stephen A. Gourlay, K. Y. Kim, F. Prelz, F. L. Fabbri, M. Boschini, B. G. Cheon, James E Wiss, P. H. Garbincius, S. Shukla, F. Leveraro, M. S. Nehring, D. Torretta, D. Brambilla, G. Bellini, S. Sala, P. H. Kasper, C. J. Kennedy, K. Danyo, R. Culbertson, James R. Wilson, L. Viola, Marco Giammarchi, L. Perasso, N. M. Cason, G. R. Blackett, G. Boca, S. Sarwar, T. Handler, M. Vittone, E. Meroni, John Perry Cumalat, G. P. Grim, Gianluca Alimonti, L. A. Garren, V. Arena, L. Cinquini, Alan D. Lopez, P. M. Yager, Luigi Moroni, J. F. Ginkel, Randy Ruchti, Paolo Vitulo, W. D. Shephard, Stefano Bianco, S. Cihangir, J. M. Bishop, Cristina Riccardi, S. P. Ratti, J. S. Kang, Robert Gardner, J. N. Butler, J. A. Swiatek, Daniele Pedrini, D. L. Puseljic, A. Sala, Paul Sheldon, P. Inzani, D. Claes, Harry Cheung, A. Zallo, I. Gaines, D. J. Harding, M. Pisharody, Gabriele Gianini, G. N. Kim, A. E. Kreymer, M. Di Corato, and C. Dallapiccola

Subjects
Baryon, Physics, Nuclear and High Energy Physics, Branching fraction, Analytical chemistry, State (functional analysis), Charm (quantum number), Atomic physics, Lower limit
Abstract

We report on the study of charm baryons decaying to Λ c + : Λ c ★+ (2625) → Λ c + π + π − , Λ c ★+ (2593) → Λ c + π + π − , Σ c 0 → Λ c + π − and Σ c ++ → Λ c + π + . We present a confirmation of the state Λ c ∗+ (2593) and determine its mass difference to be M ( Λ c ★+ (2593)) − M ( Λ c + ) = 309.2 ± 0.7 ± 0.3 MeV/ c 2 . We determine the lower limit on the resonant branching ratio to be BR (Λ c ★+ (2593) → Σ c π ± Λ c ★+ (2593) → Λ c + π + π − ) > 0.51 (90% c.l.). We also measure the mass differences M ( Σ c 0 ) − M ( Λ c + ) = 166.6±0.5±0.6 MeV/ c 2 and M ( Σ c ++ ) − M ( Λ c + ) = 167.6±0.6±0.6 MeV/ c 2 . Finally, we measure the relative photoproduction cross sections for Λ c ★+ and Σ c with respect to the (inclusive) photoproduction cross section for Λ c + .

Published
1996

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

Author

P. Inzani, D. Claes, S. Sarwar, D. L. Puseljic, W. D. Shephard, Stefano Bianco, Cristina Riccardi, A. Spallone, James E Wiss, R. Diaferia, D. J. Harding, James R. Wilson, R. Yoshida, F. Leveraro, Paul Sheldon, G. Boca, M. Vittone, B. O'Reilly, L. Garren, J. S. Kang, E. Meroni, G. P. Grim, John Perry Cumalat, S. Cihangir, Sandra Malvezzi, D. Torretta, Gianluca Alimonti, T. Handler, Alan D. Lopez, V. S. Paolone, L. Cinquini, I. Gaines, Senta Greene, C. W. Bogart, P. L. Frabetti, T. F. Lin, B. Caccianiga, N. M. Cason, J. M. Bishop, A. Zallo, J. F. Ginkel, Marco Giammarchi, Dario Menasce, K. Y. Kim, J. N. Butler, H. Mendez, Paolo Vitulo, J. F. Filasetta, M. Pisharody, E. J. Mannel, B. Gobbi, G. R. Blackett, P. H. Garbincius, D. Buchholz, S. Sala, J. D. Cunningham, P. M. Yager, S. Culy, K. Lingel, Gabriele Gianini, Fabrizio Fabbri, Z. Y. Wu, R. Greene, R. J. Mountain, S. P. Ratti, H. W.K. Cheung, B. G. Cheon, L. Perasso, R. Culbertson, P. H. Kasper, V. Arena, F. Davenport, Randy Ruchti, G. Jaross, Willard Johns, S. Shukla, Stephen A. Gourlay, G. N. Kim, J. K. Busenitz, C. J. Kenney, C. Castoldi, S. Park, A. E. Kreymer, P. Lebrun, M. Di Corato, Luigi Moroni, Robert Gardner, J. A. Swiatek, M. E. Zanabria, C. Dallapicola, M. S. Nehring, G. Bellini, and Daniele Pedrini

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Branching fraction, Analytical chemistry, Charge (physics), Electron
Abstract

Fermilab high-energy photoproduction experiment E687 provides a high statistics sample of the decay mode D + → K ∗0 μ + ν (charge conjugates are implied). Our analysis yields a branching ratio of Γ (D + → K ∗0 μ + ν) Γ (D + → K − π + π + ) = 0.56±0.04±0.06 . The ratios of the form factors governing the decay are measured to be R ν = 1.74 ±0.27±0.28 and R 2 = 0.78±0.18±0.10, implying a polarization of Γ l Γ t = 1.20±0.13 ±0.13 for the electron decay. Finally, we report new limits on the decay modes D + → K − π + μ + ν (nonresonent) and D + → K ∗0 π 0 μ + ν .

Published
1995

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

Author

Robert Gardner, D. L. Puseljic, A. Sala, M. Boschini, P. Inzani, D. Brambilla, K. Danyo, A. Zallo, G. N. Kim, G. Boca, G. Bellini, J. A. Swiatek, James E Wiss, N. M. Cason, Paul Sheldon, S. Sala, B. O'Reilly, A. E. Kreymer, D. J. Harding, P. Lebrun, J. R. Wilson, Gianluca Alimonti, R. Culbertson, J. S. Kang, Luigi Moroni, G. R. Blackett, Randy Ruchti, M. Vittone, W. D. Shephard, Stefano Bianco, M. Pisharody, M. Di Corato, Cristina Riccardi, John Perry Cumalat, S. Shukla, L. Perasso, K. Y. Kim, L. Viola, T. F. Lin, Dario Menasce, Gabriele Gianini, S. P. Ratti, Fabrizio Fabbri, C. Castoldi, J. M. Bishop, Sandra Malvezzi, L. Cinquini, Daniele Pedrini, Marco Giammarchi, P. L. Frabetti, J. F. Ginkel, B. Caccianiga, Z. Y. Wu, D. Buchholz, F. Davenport, C. J. Kennedy, S. Cihangir, L. Garren, E. Meroni, G. P. Grim, B. G. Cheon, S. Sarwar, T. Handler, D. Claes, V. Arena, B. Gobbi, P. H. Kasper, Stephen A. Gourlay, V. S. Paolone, P. M. Yager, Alan D. Lopez, D. Torretta, M. S. Nehring, J. N. Butler, I. Gaines, R. Greene, P. H. Garbincius, F. Leveraro, Willard Johns, H. W.K. Cheung, Paolo Vitulo, C. Dallapiccola, and F. Prelz

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, High energy, Meson, Branching fraction
Abstract

We report the results of a search for the doubly Cabibbo suppressed decays D+ → K+K−K+ and D+ → ΦK+, and the singly Cabibbo suppressed decays Ds+ → K+K−K+ and Ds+ → ΦK+. Our measurements are all consistent with zero branching ratio, and we set 90% confidence level upper limits on the relative D+ branching ratios: BR(ΦK + ) BR(Φπ + ) , BR(K + K − K + ) BR(Φπ + ) and BR(K + K − K + ) BR(K − π + π + ) , and the relative Ds+ branching ratios: BR(ΦK + ) BR(Φπ + ) and BR(K + K − K + ) BR(Φπ + ) . The data were accumulated by the Fermilab high energy photoproduction experiment E687.

Published
1995

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

Author

M. S. Nehring, S. Sala, M. Vittone, V. S. Paolone, John Perry Cumalat, Willard Johns, Paul Sheldon, James E Wiss, F. Leveraro, D. J. Harding, L. Cinquini, J. F. Ginkel, J. S. Kang, T. F. Lin, J. M. Bishop, L. A. Garren, J. N. Butler, B. Caccianiga, E. Meroni, B. O'Reilly, Sandra Malvezzi, M. Boschini, G. P. Grim, K. Y. Kim, Gianluca Alimonti, P. H. Garbincius, Randy Ruchti, P. L. Frabetti, Marco Giammarchi, F. L. Fabbri, Z. Y. Wu, Alan D. Lopez, A. Zallo, S. Shukla, C. Castoldi, M. Pisharody, Dario Menasce, F. Prelz, V. Arena, B. G. Cheon, I. Gaines, D. Buchholz, G. R. Blackett, N. M. Cason, B. Gobbi, P. H. Kasper, Gabriele Gianini, D. Brambilla, L. Perasso, R. Culbertson, S. Cihangir, G. Boca, James R. Wilson, R. Greene, G. Bellini, G. N. Kim, D. Torretta, T. Handler, A. E. Kreymer, P. Lebrun, M. Di Corato, Daniele Pedrini, P. Inzani, D. Claes, H. W.K. Cheung, L. Viola, S. P. Ratti, W. D. Shephard, Stefano Bianco, Luigi Moroni, Cristina Riccardi, C. J. Kennedy, F. Davenport, Robert Gardner, P. M. Yager, S. Sarwar, D. L. Puseljic, A. Sala, J. A. Swiatek, Stephen A. Gourlay, C. Dallapiccola, and Paolo Vitulo

Subjects
Physics, Nuclear and High Energy Physics, Crystallography
Abstract

Branching ratios and upper limits at 90% confidence level for D+ and Ds+ → K+π−π+ decays collected in Fermilab photoproduction experiment E-687 are reported. The D+ results are: Γ(D + → K + π − π + ) Γ(D + → K − π + π + ) = (7.2 ± 2.3 ± 1.7) × 10 −3 , Γ(D + → K ∗0 (892)π + ) Γ(D + → K − π + π + ) , and Γ(D + → K + ϱ 0 (770)) Γ(D + → K − π + π + ) . The Ds+ results are: Γ(D s + → K + π − π + ) Γ(D s + → Φ(1020)π + ) = 0.28 ± 0.06 ± 0.05 , Γ(D s + → K ∗0 (892)π + Γ(D s + → Φ(1020)π + ) = 0.18 ± 0.05 ± 0.04 , and Γ(D s + → K + ϱ 0 (770)) Γ(D s + → Φ(1020)π + ) .

Published
1995

13. First measurement of the lifetime of the Ω

Author

G. N. Kim, M. Vittone, L. A. Garren, C. Castoldi, Randy Ruchti, B. Gobbi, D. Brambilla, D. J. Harding, Sandra Malvezzi, James E Wiss, S. Sala, K. Danyo, R. Culbertson, B. Caccianiga, P. L. Frabetti, G. Boca, Daniele Pedrini, M. Boschini, N. M. Cason, F. Prelz, S. Cihangir, C. Dallapiccola, F. Davenport, D. Claes, G. Bellini, Paul Sheldon, E. Meroni, V. Arena, G. P. Grim, R. Greene, Luigi Moroni, D. Buchholz, Marco Giammarchi, G. Alimonti, A. E. Kreymer, P. Lebrun, T. Handler, H. W.K. Cheung, F. L. Fabbri, Senta Greene, S. Shukla, I. Gaines, Dario Menasce, Z. Y. Wu, L. Cinquini, M. Di Corato, P. H. Garbincius, C. J. Kennedy, V. S. Paolone, Robert Gardner, A. Sala, M. S. Nehring, S. P. Ratti, D. Torretta, P. Inzani, J. S. Kang, A. Zallo, P. M. Yager, B. G. Cheon, J. F. Ginkel, P. H. Kasper, John Perry Cumalat, J. A. Swiatek, J. N. Butler, M. Pisharody, Stephen A. Gourlay, F. Leveraro, Willard Johns, Gabriele Gianini, Alan D. Lopez, J. M. Bishop, Paolo Vitulo, L. Viola, James R. Wilson, S. Sarwar, G. R. Blackett, B. O'Reilly, D. L. Puseljic, W. D. Shephard, Stefano Bianco, Cristina Riccardi, L. Perasso, K. Y. Kim, and T. F. Lin

Subjects
Hadronic decay, Physics, Nuclear and High Energy Physics, High energy, Nuclear Theory, chemistry.chemical_element, Sigma, Nuclear physics, Charmed baryons, Baryon, chemistry, High Energy Physics::Experiment, Statistical analysis, Fermilab, Beryllium, Nuclear Experiment
Abstract

We present the first measurement of the lifetime of the Ω c 0 baryon. The data were collected in the Fermilab high energy photoproduction experiment E687. The measured lifetime is τ = 86−20+27(stat.) ± 28(syst.) fr. Thus the Ω c 0 has one of the shorter lifetimes among the weakly decaying singly charmed baryons.

Published
1995

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

Author

C. Dallapiccola, F. Davenport, M. Pisharody, Robert Gardner, P. H. Garbincius, Z. Y. Wu, C. Castoldi, D. L. Puseljic, B. Gobbi, S. Shukla, B. G. Cheon, F. Prelz, Alan D. Lopez, Sandra Malvezzi, Gabriele Gianini, L. Garren, E. Meroni, J. A. Swiatek, Stephen A. Gourlay, S. P. Ratti, P. L. Frabetti, G. P. Grim, C. J. Kennedy, T. F. Lin, L. Cinquini, J. F. Ginkel, Luigi Moroni, P. Inzani, P. M. Yager, J. N. Butler, G. R. Blackett, A. Zallo, Daniele Pedrini, M. S. Nehring, B. O'Reilly, John Perry Cumalat, G. Bellini, N. M. Cason, M. Boschini, G. N. Kim, Paolo Vitulo, D. J. Harding, James E Wiss, S. Sala, W. D. Shephard, Stefano Bianco, I. Gaines, D. Buchholz, D. Brambilla, Marco Giammarchi, Randy Ruchti, D. Claes, Cristina Riccardi, G. Alimonti, A. E. Kreymer, S. Cihangir, Paul Sheldon, P. Lebrun, F. Leveraro, L. Viola, V. S. Paolone, M. Vittone, L. Perasso, P. H. Kasper, J. M. Bishop, Willard Johns, M. Di Corato, A. Sala, J. S. Kang, Dario Menasce, G. Boca, Fabrizio Fabbri, B. Caccianiga, D. Torretta, R. Culbertson, R. Greene, S. Sarwar, V. Arena, James R. Wilson, Senta Greene, H. W.K. Cheung, K. Y. Kim, and T. Handler

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, High energy, Nuclear magnetic resonance, Amplitude, Fermilab, Branching (polymer chemistry)
Abstract

Amplitude analyses of the D+ and Ds+ → K+K−π+ Dalitz plots are presented using data collected by the Fermilab high energy photoproduction experiment E687. Our data are fit to a model consisting of a sum of Breit-Wigner amplitudes for the intermediate two-body resonant decay modes. We extract decay fractions and relative phases. These results are used to infer new branching ratios for D+ → K+K−π+ inclusive as well as the Φπ+ and K ∗ (892) 0 K + channels.

Published
1995

15. Charm meson decay into the final states K0K+ and KK

Author

M. Pisharody, W. D. Shephard, Stefano Bianco, Alan D. Lopez, Cristina Riccardi, Gabriele Gianini, B. Gobbi, A. Zallo, C. J. Kennedy, T. F. Lin, Luigi Moroni, B. O'Reilly, J. S. Kang, John Perry Cumalat, D. J. Harding, S. Sarwar, D. Buchholz, F. Davenport, D. L. Puseljic, A. Sala, P. M. Yager, L. Cinquini, D. Torretta, P. H. Kasper, F. L. Fabbri, S. Sala, Daniele Pedrini, S. P. Ratti, Marco Giammarchi, N. M. Cason, J. M. Bishop, S. Shukla, Stephen A. Gourlay, R. Greene, P. Inzani, D. Claes, H. W.K. Cheung, Robert Gardner, Sandra Malvezzi, P. L. Frabetti, Dario Menasce, J. A. Swiatek, G. R. Blackett, T. Handler, James R. Wilson, L. Perasso, R. Culbertson, Senta Greene, Willard Johns, S. Cihangir, K. Y. Kim, L. A. Garren, G. Boca, I. Gaines, Randy Ruchti, C. Dallapiccola, J. F. Ginkel, G. Bellini, J. N. Butler, P. H. Garbincius, Paul Sheldon, M. Vittone, A. E. Kreymer, P. Lebrun, Z. Y. Wu, B. G. Cheon, M. Di Corato, V. Arena, James E Wiss, F. Leveraro, G. N. Kim, C. Castoldi, M. S. Nehring, Paolo Vitulo, E. Meroni, G. P. Grim, Gianluca Alimonti, V. S. Paolone, and B. Caccianiga

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

We have made a new measurement of the branching ratio Γ(D + → K 0 K + ) Γ(D + → K 0 π + ) and the first measurement of Γ(D + → K 0 K ∗+ ) Γ(D + → K 0 π + ) . The data were accumulated in the 1990–1991 fixed target running period of Fermilab high energy photoproduction experiment E687. We measure Γ(D + → K 0 K + ) Γ(D + → K 0 π + ) = 0.25 ± 0.04 ± 0.02 and Γ(D + → K 0 K ∗+ ) Γ(D + → K 0 π + ) = 1.1 ± 0.3 ± 0.4 .

Published
1995

16. Branching ratios of the decays and D0 → KS0KS0KS0

Author

C. Castoldi, A. Sala, G. R. Blackett, D. J. Harding, M. S. Nehring, V. Arena, John Perry Cumalat, Senta Greene, J. M. Bishop, B. Caccianiga, M. Vittone, B. Gobbi, G. Alimonti, A. E. Kreymer, P. Lebrun, F. L. Fabbri, R. Culbertson, C. Dallapiccola, Robert Gardner, G. Bellini, Paolo Vitulo, P. Inzani, A. Zallo, S. Sala, S. Cihangir, M. Di Corato, D. Buchholz, M. Pisharody, S. P. Ratti, J. A. Swiatek, G. N. Kim, Z. Y. Wu, C. J. Kennedy, F. Davenport, F. Leveraro, Gabriele Gianini, G. Boca, Luigi Moroni, Willard Johns, B. G. Cheon, N. M. Cason, Sandra Malvezzi, T. Handler, K. Y. Kim, P. H. Kasper, V. S. Paolone, B. O'Reilly, Paul Sheldon, P. L. Frabetti, D. Torretta, L. A. Garren, R. Greene, P. M. Yager, Stephen A. Gourlay, James R. Wilson, Dario Menasce, Randy Ruchti, T. F. Lin, Marco Giammarchi, H. W.K. Cheung, S. Shukla, L. Cinquini, Alan D. Lopez, James E Wiss, D. L. Puseljic, S. Sarwar, W. D. Shephard, Stefano Bianco, J. S. Kang, Cristina Riccardi, I. Gaines, L. Perasso, P. H. Garbincius, E. Meroni, G. P. Grim, Daniele Pedrini, J. F. Ginkel, J. N. Butler, and D. Claes

Subjects
Physics, Nuclear and High Energy Physics, High energy, Crystallography, Atomic physics, Branching (polymer chemistry)
Abstract

The branching ratios of D 0 → K 0 K 0 and D0 → Ks0Ks0Ks0 relative to D 0 → K 0 π + π − are reported. The data were accumulated in the 1990–1991 fixed target running period of the Fermilab high energy photoproduction experiment E687. Γ (D 0 → K 0 K 0 )/Γ (D 0 → K 0 π + π − is measured to be 0.039±0.013±0.013 and Γ (D 0 →K s 0 K s 0 K s 0 )/Γ (D 0 → K 0 π + π − ) is measured to be 0.035±0.012±0.006. We also measure Γ (D 0 → K 0 π + π − /Γ (D 0 → K − π + ) to be 1.61±0.10±0.15.

Published
1994

17. Observation and mass measurement of

Author

James E Wiss, F. Leveraro, Senta Greene, G. N. Kim, L. Garren, E. Meroni, G. P. Grim, Gianluca Alimonti, W. D. Shephard, Stefano Bianco, James R. Wilson, S. Sarwar, Daniele Pedrini, Cristina Riccardi, K. Y. Kim, L. Perasso, R. Culbertson, Sandra Malvezzi, T. Handler, P. Inzani, D. Claes, C. Castoldi, P. L. Frabetti, B. O'Reilly, G. R. Blackett, Paolo Vitulo, Fabrizio Fabbri, Alan D. Lopez, Marco Giammarchi, D. L. Puseljic, A. Sala, V. S. Paolone, J. S. Kang, Dario Menasce, John Perry Cumalat, L. Cinquini, Willard Johns, A. E. Kreymer, C. Dallapiccola, R. Greene, B. Caccianiga, P. Lebrun, B. Gobbi, G. Bellini, G. Boca, S. P. Ratti, J. M. Bishop, V. Arena, H. W.K. Cheung, D. Buchholz, M. Di Corato, Z. Y. Wu, P. H. Kasper, B. G. Cheon, M. S. Nehring, Paul Sheldon, C. J. Kennedy, P. M. Yager, D. Torretta, M. Pisharody, Gabriele Gianini, J. F. Ginkel, Robert Gardner, S. Sala, J. A. Swiatek, J. N. Butler, T. F. Lin, L. Viola, D. J. Harding, P. H. Garbincius, Luigi Moroni, M. Vittone, A. Zallo, I. Gaines, F. Davenport, Stephen A. Gourlay, N. M. Cason, Randy Ruchti, S. Shukla, and S. Cihangir

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, High energy, chemistry, chemistry.chemical_element, Fermilab, Beryllium, Atomic physics, Mass measurement
Abstract

We present evidence for the Ω c 0 in a new decay mode Ω c 0 → Σ + K − K − π + , for which we find 42.5 ± 8.8 events with a mass of 2699.9 ± 1.5 ± 2.5 MeV/c 2 . The data are from Fermilab high energy photoproduction experiment E687.

Published
1994

18. New results on heavy-flavor photoproduction from the E687 experiment at FNAL

Author

Robert Gardner, G. R. Blackett, Fabrizio Fabbri, M. Pisharody, J. A. Swiatek, M. Vittone, J. F. Filaseta, L. Perasso, R. Culbertson, A. Zallo, Gabriele Gianini, D. Buchholz, W. D. Shephard, Stefano Bianco, Cristina Riccardi, F. Davenport, Randy Ruchti, D. J. Harding, Z. Y. Wu, Luigi Moroni, John Perry Cumalat, V. S. Paolone, S. Cihangir, B. G. Cheon, P. H. Kasper, D. L. Puseljic, A. Sala, Stephen A. Gourlay, T. Handler, N. M. Cason, B. O'Reilly, D. Perdini, L. Cinquini, R. Greene, Alan D. Lopez, James R. Wilson, Senta Greene, J. M. Bishop, J. S. Kang, S. Shukla, S. P. Ratti, H. W.K. Cheung, Willard Johns, P. M. Yager, B. Gobbi, G. Bellini, Paul Sheldon, K. Y. Kim, S. Sarwar, G. N. Kim, C. Dallapiccola, Sandra Malvezzi, M. S. Nehring, P. L. Frabetti, Dario Menasce, T. F. Lin, G. P. Grim, P. Inzani, D. Claes, A. E. Kreymer, D. Torretta, P. Lebrun, S. Sala, M. Di Corato, V. Arena, C. Castoldi, F. Leveraro, J. F. Ginkel, J. N. Butler, G. Boca, C. J. Kennedy, Marco Giammarchi, I. Gaines, P. H. Garbincius, B. Caccianiga, Paolo Vitulo, James E Wiss, L. Garren, E. Meroni, and Gianluca Alimonti

Subjects
Physics, Nuclear physics, Particle physics, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Cover (algebra), High statistic, Charm (quantum number), Nuclear Experiment
Abstract

The new results on charm from E687 photoproduction experiment are presented. They follow from very high statistic measurents and cover a wide variety of physics items in the charm sector. Charm photoproduction studies, very accurate lifetime measurements, analysis of several semi-leptonic decays and hadronic decays are discussed. Particular attention has been devoted to compare E687 results with other experiments.

Published
1994

19. Search forCPviolation in charm meson decay

Author

L. A. Garren, D. Buchholz, N. M. Cason, P. H. Kasper, G. Bellini, V. Paolone, Alan D. Lopez, Randy Ruchti, G. Boca, Gianluca Alimonti, Z. Y. Wu, Richard L. Greene, S. Cihangir, M. Vittone, B. G. Cheon, S. Sarwar, S. Shukla, B. O'Reilly, F. Davenport, P. Lebrun, Stephen A. Gourlay, Senta Greene, S. Sala, A. Zallo, S. P. Ratti, Sandra Malvezzi, P. L. Frabetti, Dario Menasce, Daniele Pedrini, G. R. Blackett, C. Dallapiccola, Robert Gardner, John Perry Cumalat, L. Cinquini, P. Inzani, M. S. Nehring, W. D. Shephard, Stefano Bianco, J. M. Bishop, L. Perasso, Fabrizio Fabbri, R. Culbertson, J. A. Swiatek, Cristina Riccardi, M. Pisharody, W. E. Johns, K. Y. Kim, J. S. Kang, Luigi Moroni, James E Wiss, D. L. Puseljic, A. Sala, Harry Cheung, G. N. Kim, Paul Sheldon, D. Torretta, C. Castoldi, Gabriele Gianini, A. E. Kreymer, M. Di Corato, D. J. Harding, J. N. Butler, T. F. Lin, T. Handler, D. R. Claes, J. R. Wilson, Marco Giammarchi, V. Arena, B. Gobbi, C. J. Kennedy, I. Gaines, J. F. Ginkel, P. M. Yager, B. Caccianiga, F. Leveraro, J. F. Filasetta, P. H. Garbincius, Paolo Vitulo, E. Meroni, and G. P. Grim

Subjects
Combinatorics, Physics, Particle physics, High energy, Meson, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, CP violation
Abstract

We report the results of a search for [ital CP]-violating decay rate asymmetries ([ital A][sub [ital CP]]) in the charm decay modes [ital D][sup +][r arrow][ital K][sup [minus]][ital K][sup +][pi][sup +], [ital D][sup +][r arrow][ital [bar K]][sup *0][ital K][sup +], [ital D][sup +][r arrow][phi][pi][sup +], and [ital D][sup 0][r arrow][ital K][sup +][ital K][sup [minus]]. Our measurements are all consistent with zero asymmetry: [ital A][sub [ital CP]]([ital KK][pi])=[minus]0.031[plus minus]0.068, [ital A][sub [ital CP]]([ital K][sup *][ital K])=[minus]0.12[plus minus]0.13, [ital A][sub [ital CP]]([phi][pi])=0.066[plus minus]0.086, and [ital A][sub [ital CP]]([ital KK])=0.024[plus minus]0.084. The data were accumulated by the Fermilab high energy photoproduction experiment E687.

Published
1994

20. Analysis of three D → Kππ Dalitz plots

Author

Daniele Pedrini, V. Arena, P. Inzani, B. Gobbi, G. Bellini, N. M. Cason, D. Claes, I. Gaines, M. Vittone, Z. Y. Wu, P. Lebrum, J. F. Ginkel, B. G. Cheon, Fabrizio Fabbri, D. Torretta, J. N. Butler, C. Castoldi, Paolo Vitulo, K. Y. Kim, M. S. Nehring, John Perry Cumalat, P. H. Garbincius, F. Leveraro, Paul Sheldon, James E Wiss, D. Buchholz, L. Cinquini, C. J. Kennedy, V. S. Paolone, B. O'Reilly, M. Pisharody, Senta Greene, L. Garren, E. Meroni, G. P. Grim, S. Sarwar, Marco Giammarchi, J. S. Kang, B. Caccianiga, L. Perasso, R. Culbertson, Luigi Moroni, Gianluca Alimonti, P. M. Yager, W. D. Shephard, Stefano Bianco, T. Handler, J. M. Bishop, R. Greene, Sandra Malvezzi, P. L. Frabetti, Dario Menasce, Cristina Riccardi, F. Davenport, P. H. Kasper, H. W.K. Cheung, G. N. Kim, A. E. Kreymer, D. L. Puseljic, A. Sala, M. Di Corato, Gianluigi Boca, Alan D. Lopez, C. Dallapiccola, Gabriele Gianini, Robert Gardner, G. R. Blackett, J. A. Swiatek, S. Sala, A. Zallo, D. J. Harding, Stephen A. Gourlay, T. F. Lin, S. Shukla, Randy Ruchti, S. Cihangir, James R. Wilson, Willard Johns, and S. P. Ratti

Subjects
Physics, Nuclear and High Energy Physics, High energy, Particle physics, Dalitz plot, chemistry.chemical_element, Elementary particle, lcsh:QC1-999, Nuclear physics, Particle decay, Amplitude, chemistry, High Energy Physics::Experiment, Fermilab, Beryllium, lcsh:Physics
Abstract

Analysis of three D → Kππ Dalitz plots is presented using data collected by the Fermilab high energy photoproduction experiment E687. Our data are fit to a model consisting of a sum of Breit-Wigner amplitudes for the intermediate two-body resonant decay modes and a constant term for the nonresonant contribution. We extract branching fractions and relative phases and compare them to the results obtained in other experiments. Although this model qualitatively reproduces many features of our data, statistically significant discrepancies are observed in some of our fits.

Published
1994

21. Measurement of the form factors for the decay D+s → φμ+ν

Author

F. Leveraro, V. S. Paolone, Robert Gardner, M. S. Nehring, Willard Johns, M. Vittone, B. O'Reilly, D. Dallapiccola, John Perry Cumalat, D. Torretta, S. Cihangir, P. Inzani, G. N. Kim, Dario Menasce, A. Zallo, M. Pisharody, N. M. Cason, C. J. Kennedy, A. Sala, B. Caccianiga, B. Gobbi, James R. Wilson, J. A. Swiatek, Z. Y. Wu, V. Arena, F. Davenport, C. Castoldi, Gabriele Gianini, J. M. Bishop, E. Meroni, G. P. Grim, P. M. Yager, Luigi Moroni, G. Boca, S. Shukla, Stephen A. Gourlay, D. J. Harding, Paolo Vitulo, F. L. Fabbri, L. Cinquini, Sandra Malvezzi, Byung Gu Cheon, Paul Sheldon, P. L. Frabetti, G. R. Blackett, Marco Giammarchi, G. Bellini, J. F. Filaseta, L. A. Garren, James E Wiss, G. Alimonti, T. Handler, A. E. Kreymer, Randy Ruchti, P. Lebrun, Senta Greene, S. P. Ratti, M. Di Corato, Alan D. Lopez, D. Buchholz, S. Sala, P. H. Kasper, T. F. Lin, S. Sarwar, W. D. Shephard, Stefano Bianco, Cristina Riccardi, L. Perasso, D. L. Puseljic, J. F. Ginkel, J. N. Butler, I. Gaines, P. H. Garbincius, Daniele Pedrini, D. Claes, J. S. Kang, R. Greene, H. W.K. Cheung, R. Culbertson, and K. Y. Kim

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, High energy, Elementary particle, Electron, Fermilab, Atomic physics, Polarization (waves)
Abstract

The fermilab high-energy photoproduction experiment E687 provides a sample of approximately 90 events of the decay mode D+s→ φμ+ ν. The ratios of the form factors governing the decay are measured to be Rv=1.8±0.9±0.2 and R2= 1.1±0.8±0.1, implying a polarization of Г 1 /Г t = 1.0±0.5±0.1 for the electron decay, consistent with our measurement of the form factor for the decay D + → K ∗0 μ + ν .

Published
1994

22. First observation of the Σ− π+ π+ decay mode of the Λc baryon and its branching ratio relative to the Σ+ π+ π− mode

Author

F. L. Fabbri, Sandra Malvezzi, P. L. Frabetti, James R. Wilson, Paul Sheldon, M. Pisharody, F. Leveraro, B. Gobbi, Willard Johns, V. Arena, B. O'Reilly, F. Davenport, S. Sala, C. J. Kennedy, T. F. Lin, D. Buchholz, G. Boca, E. Meroni, G. P. Grim, Dario Menasce, D. L. Puseljic, I. Gaines, J. S. Kang, V. S. Paolone, P. M. Yager, K. Y. Kim, P. H. Garbincius, Stephen A. Gourlay, Gabriele Gianini, G. R. Blackett, T. Handler, N. M. Cason, D. Torretta, John Perry Cumalat, L. A. Garren, James E Wiss, J. M. Bishop, Marco Giammarchi, Senta Greene, J. F. Ginkel, Randy Ruchti, J. N. Butler, W. D. Shephard, Stefano Bianco, S. Cihangir, D. J. Harding, S. P. Ratti, Cristina Riccardi, L. Perasso, C. Dallapicoola, R. Culbertson, Paolo Vitulo, Daniele Pedrini, B. Caccianiga, M. Vittone, P. H. Kasper, R. Greene, Z. Y. Wu, P. Inzani, S. Shukla, A. Zallo, A. Sala, H. W.K. Cheung, D. Claes, L. Cinquini, B. G. Cheon, S. Sarwar, Alan D. Lopez, G. Alimonti, A. E. Kreymer, P. Lebrun, M. Di Corato, C. Castoldi, L. Viola, G. N. Kim, Luigi Moroni, Robert Gardner, J. A. Swiatek, M. S. Nehring, and G. Bellini

Subjects
Physics, Baryon, Nuclear physics, Nuclear and High Energy Physics, Particle decay, Mass distribution, Branching fraction, Elementary particle, Charge (physics), Atomic physics, Sigma baryon, Conjugate
Abstract

We report the first observation (103±17 events) of the decay Λ+c → Σ−π+π+ and the charge conjugate. A measurement of the relative branching ratio Г (Λ + c → Σ − π + π + )/Г (Λ + c → Σ + π + π + π − = 0.53±0.15 (stat) ± 0.07 (sys) is also presented.

Published
1994

23. Precise measurements of the D0 and D+ meson lifetimes

Author

J. S. Kang, D. L. Puseljic, A. Sala, S. Shukla, Robert Gardner, P. H. Garbincius, J. N. Butler, Senta Greene, J. A. Swiatek, S. Sala, M. Pisharody, Stephen A. Gourlay, C. Dallapiccola, B. Gobbi, G. Bellini, T. F. Lin, Daniele Pedrini, N. M. Cason, G. Boca, B. O'Reilly, Luigi Moroni, Paolo Vitulo, S. Cihangir, Z. Y. Wu, K. Y. Kim, P. Inzani, D. Claes, S. Sarwar, J. R. Wilson, I. Gaines, A. E. Kreymer, P. Lebrun, B. G. Cheon, Gabriele Gianini, Gianluca Alimonti, W. D. Shephard, Stefano Bianco, F. Davenport, S. P. Ratti, D. J. Harding, Paul Sheldon, Alan D. Lopez, Cristina Riccardi, J. F. Ginkel, Marco Giammarchi, L. Garren, E. Meroni, G. P. Grim, J. F. Filaseta, M. Di Corato, D. Buchholz, C. J. Kennedy, Randy Ruchti, D. Torretta, P. H. Kasper, T. Handler, M. Vittone, John Perry Cumalat, R. Greene, Fabrizio Fabbri, G. N. Kim, A. Zallo, L. Cinquini, P. M. Yager, Willard Johns, H. W.K. Cheung, V. S. Paolone, C. Castoldi, Sandra Malvezzi, J. M. Bishop, B. Caccianiga, P. L. Frabetti, L. Perasso, R. Culbertson, Dario Menasce, G. R. Blackett, V. Arena, M. S. Nehring, James E Wiss, and F. Leveraro

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Meson, Life span, D meson, Elementary particle, Fermilab
Abstract

We report precise measurements of the D 0 and D + meson lifetimes by the E687 Collaboration at Fermilab. The measurements have been made using 16000 fully reconstructed decays of the D 0 into the K − π + and K − π + π − π + final states and 9000 decays of the D + into the K − π + π + final state. The lifetimes of the D 0 and D + mesons are measured to be 0.413±0.004±0.003 ps and 1.048±0.015±01011 ps respectively.

Published
1994

24. Observation of an excited state of theΛc+baryon

Author

G. Alimonti, A. E. Kreymer, P. Lebrun, N. M. Cason, L. Garren, E. Meroni, G. P. Grim, T. F. Lin, M. Di Corato, P. H. Garbincius, D. L. Puseljic, C. Dallapiccola, M. Pisharody, Alan D. Lopez, S. Sala, G. N. Kim, R. Culbertson, C. J. Kennedy, Marco Giammarchi, Paul Sheldon, T. Handler, B. O'Reilly, Gabriele Gianini, C. Castoldi, Daniele Pedrini, I. Gaines, Robert Gardner, P. M. Yager, M. Vittone, J. F. Ginkel, Paolo Vitulo, S. Sarwar, D. Buchholz, K. Y. Kim, V. S. Paolone, J. A. Swiatek, J. N. Butler, M. S. Nehring, J. F. Filasetta, D. Claes, R. Greene, W. D. Shephard, Stefano Bianco, D. Torretta, P. Inzani, Cristina Riccardi, G. R. Blackett, L. Perasso, A. Zallo, B. G. Cheon, P. H. Kasper, Luigi Moroni, Sandra Malvezzi, J. S. Kang, P. L. Frabetti, D. J. Harding, John Perry Cumalat, James E Wiss, J. M. Bishop, V. Arena, Dario Menasce, S. Shukla, H. W.K. Cheung, L. Cinquini, S. Cihangir, S. P. Ratti, James R. Wilson, A. Sala, F. Leveraro, F. Davenport, Willard Johns, Randy Ruchti, Senta Greene, G. Boca, Stephen A. Gourlay, Fabrizio Fabbri, B. Caccianiga, B. Gobbi, G. Bellini, and Z. Y. Wu

Subjects
Baryon, Charmed baryons, Physics, Statistics::Theory, Crystallography, Statistics::Applications, Branching fraction, Excited state, General Physics and Astronomy, Atomic physics, Lambda
Abstract

An observation of an excited ${\mathrm{\ensuremath{\Lambda}}}_{\mathit{c}}^{+\mathrm{*}}$ baryon decaying to ${\mathrm{\ensuremath{\Lambda}}}_{\mathit{c}}^{+}$${\mathrm{\ensuremath{\pi}}}^{+}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$, with ${\mathrm{\ensuremath{\Lambda}}}_{\mathit{c}}^{+}$\ensuremath{\rightarrow}${\mathit{pK}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\pi}}}^{+}$, is presented. We reconstruct 39.7\ifmmode\pm\else\textpm\fi{}8.7${\mathrm{\ensuremath{\Lambda}}}_{\mathit{c}}^{+\mathrm{*}}$ baryons with a mass of 340.4\ifmmode\pm\else\textpm\fi{}0.6\ifmmode\pm\else\textpm\fi{}0.3 MeV/${\mathit{c}}^{2}$ above the ${\mathrm{\ensuremath{\Lambda}}}_{\mathit{c}}^{+}$ mass. The upper limit on the resonant branching ratio is B(${\mathrm{\ensuremath{\Lambda}}}_{\mathit{c}}^{+\mathrm{*}}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\Sigma}}}_{\mathit{c}}$${\mathrm{\ensuremath{\pi}}}^{\ifmmode\pm\else\textpm\fi{}}$)/B(${\mathrm{\ensuremath{\Lambda}}}_{\mathit{c}}^{+\mathrm{*}}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\Lambda}}}_{\mathit{c}}^{+}$ ${\mathrm{\ensuremath{\pi}}}^{+}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$)36% at the 90% confidence level.

Published
1994

25. A measurement of the Cabibbo-suppressed decays D0 → π−π+ and D0 → K−K+

Author

C. Dallapiccola, Willard Johns, Robert Gardner, J. F. Filaseta, G. N. Kim, M. Pisharody, T. Handler, G. Boca, Randy Ruchti, James E Wiss, F. Leveraro, Daniele Pedrini, James R. Wilson, S. Cihangir, B. Gobbi, G. Bellini, J. A. Swiatek, P. Inzani, V. Arena, D. Claes, Gabriele Gianini, Sandra Malvezzi, Alan D. Lopez, I. Gaines, W. D. Shephard, Stefano Bianco, M. S. Nehring, T. F. Lin, C. Castoldi, Z. Y. Wu, P. L. Frabetti, Senta Greene, Cristina Riccardi, A. E. Kreymer, S. Shukla, P. Lebrun, Dario Menasce, P. H. Garbincius, J. S. Kang, B. G. Cheon, M. Di Corato, D. Buchholz, C. J. Kennedy, John Perry Cumalat, K. Y. Kim, M. Vittone, S. P. Ratti, P. M. Yager, D. L. Puseljic, A. Sala, P. H. Kasper, L. Cinquini, S. Sala, A. Zallo, R. Greene, L. Garren, J. F. Ginkel, E. Meroni, G. P. Grim, Gianluca Alimonti, Fabrizio Fabbri, Luigi Moroni, D. J. Harding, J. M. Bishop, B. O'Reilly, H. W.K. Cheung, Stephen A. Gourlay, J. N. Butler, L. Perasso, R. Culbertson, Marco Giammarchi, G. R. Blackett, S. Sarwar, V. S. Paolone, Paul Sheldon, B. Caccianiga, Paolo Vitulo, N. M. Cason, D. Torretta, and F. Davenport

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, High energy, Branching fraction, Fermilab, Branching (polymer chemistry)
Abstract

We report a measurement of the relative branching ratio of two Cabibbo-suppressed decay modes: D 0 → π − π + and D 0 → K − K + . The data were accumulated in the 1990–1991 fixed target run of Fermilab high energy photoproduction experiment E687. The branching ratios of these modes relative to the Cabibbo-allowed decay D 0 → K − π + are also presented. The relative branching ratios are measured to be Γ ( D 0 → KK )/ Γ ( D 0 → ππ ) = 2.53 ± 0.46 ± 0.19, Γ ( D 0 → KK )/ Γ ( D 0 → Kπ ) = 0.109 ± 0.007 ± 0.009, and Γ ( D 0 → ππ )/ Γ ( D 0 → Kπ ) = 0.043 ± 0.007 ± 0.003.

Published
1994

26. A measurement of elastic J/ψ photoproduction cross section at Fermilab E687

Author

J. D. Cunningham, James E Wiss, E. Meroni, Gianluca Alimonti, R. W. Gardner, A. E. Kreymer, P. Lebrun, D. J. Harding, F. Leveraro, D. Torretta, Randy Ruchti, Luigi Moroni, M. Di Corato, W. D. Shepard, J. R. Wilson, P. D. Sheldon, D. L. Puseljic, A. Sala, R. J. Mountain, L. Perasso, M. Vittone, M. E. Zanabria, R. Culbertson, M. Enorini, N. M. Cason, C. Castoldi, Sandra Malvezzi, Daniele Pedrini, E. J. Mannel, P. L. Frabetti, Alan D. Lopez, Dario Menasce, S. Park, Marco Giammarchi, F. Davenport, P. Inzani, D. Claes, Gianluigi Boca, A. Zallo, Stefano Bianco, Fabrizio Fabbri, John Perry Cumalat, H. W.K. Cheung, Paolo Vitulo, G. Jaross, J. M. Bishop, D. Buchholz, S. Sala, R. Yoshida, K. Lingel, V. S. Paolone, P. H. Kasper, C. J. Kennedy, B. O'Reilly, P. M. Yager, S. Culy, Stephen A. Gourlay, J. K. Busenitz, A. Spallone, C. W. Bogart, J. N. Butler, H. Mendez, P. H. Garbincius, B. Gobbi, G. Bellini, S. P. Ratti, and I. Gaines

Subjects
Physics, Elastic scattering, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Meson, Model prediction, Nuclear Theory, Elementary particle, J/psi meson, Nuclear physics, Cross section (physics), High Energy Physics::Experiment, Fermilab, Nuclear Experiment
Abstract

Measurements of elastic photoproduction cross sections for the J / ψ meson from 100 GeV to 375 GeV are presented. The results indicate that the cross section increases slowly in this range. The shape of the energy dependence agrees well with the photon-gluon fusion model prediction.

Published
1993

27. Evidence of the Cabibbo-suppressed decay Λc+ → pK−K+

Author

C. Dallapiccola, T. F. Lin, J. S. Kang, N. M. Cason, John Perry Cumalat, James E Wiss, Daniele Pedrini, M. Vittone, D. Claes, Luigi Moroni, F. Davenport, F. Leveraro, Willard Johns, R. Culbertson, Senta Greene, J. M. Bishop, S. Sarwar, S. Cihangir, I. Gaines, C. J. Kennedy, E. Meroni, G. P. Grim, D. L. Puseljic, J. F. Ginkel, James R. Wilson, G. R. Blackett, K. Y. Kim, B. Caccianiga, B. Gobbi, P. M. Yager, J. N. Butler, G. Boca, Z. Y. Wu, Stephen A. Gourlay, P. H. Garbincius, Sandra Malvezzi, R. Greene, P. L. Frabetti, Paul Sheldon, F. L. Fabbri, P. Inzani, H. W.K. Cheung, W. D. Shephard, Stefano Bianco, J. F. Filaseta, L. A. Garren, B. G. Cheon, A. Zallo, D. Buchholz, Cristina Riccardi, Randy Ruchti, M. Pisharody, L. Perasso, S. P. Ratti, C. Castoldi, Robert Gardner, S. Sala, S. Shukla, A. Sala, L. Cinquini, P. H. Kasper, Marco Giammarchi, G. Bellini, Gabriele Gianini, D. J. Harding, Alan D. Lopez, J. A. Swiatek, G. N. Kim, G. Alimonti, A. E. Kreymer, P. Lebrun, M. S. Nehring, M. Di Corato, Paolo Vitulo, V. S. Paolone, D. Torretta, Dario Menasce, V. Arena, B. O'Reilly, and T. Handler

Subjects
Baryon, Physics, Nuclear physics, Hadronic decay, Nuclear and High Energy Physics, High energy, Proton, Branching fraction, Analytical chemistry, Elementary particle, Lambda baryon
Abstract

We report evidence for the Cabibbo-suppressed decay of the charm baryon Λ c + into the final state pK − K + . The analysis is performed on data collected by high energy photoproduction experiment E687 during the 1990–1991 Fermilab fixed target run. The branching ratio of the decay Λ c + → pK − K + relative to the non-suppressed Λ c + → pK − π + is measured to be BR( pK − K + / pK − π + ) = 0.096 ± 0.029 ± 0.010. The upper limit of the decay into po relative to the inclusive pK − K + decay is measured to be BR( po / pK − K +

Published
1993

28. Study of D0 → K− μ+ ν in high energy photoproduction

Author

Sandra Malvezzi, P. L. Frabetti, Dario Menasce, M. Vittone, John Perry Cumalat, P. H. Garbincius, R. Yoshida, D. Alliata, R. W. Gardner, J. M. Bishop, James E Wiss, F. Leveraro, Fabrizio Fabbri, P. D. Sheldon, D. Torretta, A. Spallone, E. Meroni, Gianluca Alimonti, N. M. Cason, Marco Giammarchi, Luigi Moroni, C. W. Bogart, J. N. Butler, H. Mendez, C. J. Kennedy, W. D. Shephard, Stefano Bianco, Stephen A. Gourlay, M. Enorini, J. K. Busenitz, S. Culy, J. D. Cunningham, J. R. Wilson, D. L. Puseljic, A. Sala, Paolo Vitulo, B. Gobbi, G. Bellini, A. E. Kreymer, Randy Ruchti, I. Gaines, R. J. Mountain, L. Perasso, R. Culbertson, M. Di Corato, F. Davenport, C. Castoldi, M. E. Zanabria, S. Park, Daniele Pedrini, D. Hazan, P. Inzani, S. P. Ratti, E. J. Mannel, S. Sala, K. Lingel, H. W.K. Cheung, Alan D. Lopez, D. Buchholz, G. Jaross, A. Zallo, D. J. Harding, Willard Johns, P. H. Kasper, and P. Lebrun

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, High energy, Particle physics, Photon, Muon, chemistry, Mass spectrum, chemistry.chemical_element, Elementary particle, Fermilab, Beryllium
Abstract

We report a measurement of the semimuonic decay D0→K−μ+ν from data taken during the 1987–1988 fixed target run at Fermilab by the E687 Collaboration. We obtain Γ(D0→K−μ+ν)/Γ(D0→K−π+)=0.82±0.13±0.13 and use this result to calculate Γ(D 0 →K ∗− μ + ν)/Γ(D 0 →K − μ + ν)=0.59±0.10±0.13 .

Published
1993

29. Precise measurement of theDs±meson lifetime

Author

C. J. Kennedy, P. M. Yager, M. Pisharody, Richard L. Greene, M. Vittone, A. Zallo, S. Sala, Gabriele Gianini, Robert Gardner, D. J. Harding, D. Buchholz, John Perry Cumalat, S. P. Ratti, Stephen A. Gourlay, J. A. Swiatek, D. R. Claes, Fabrizio Fabbri, L. Cinquini, C. Dallapiccola, W. D. Shephard, Stefano Bianco, Cristina Riccardi, Luigi Moroni, A. E. Kreymer, P. Lebrun, D. L. Puseljic, A. Sala, Harry Cheung, P. H. Kasper, N. M. Cason, W. E. Johns, J. M. Bishop, B. Caccianiga, B. G. Cheon, M. Di Corato, Sandra Malvezzi, P. L. Frabetti, E. Meroni, G. P. Grim, Dario Menasce, Z. Y. Wu, C. Castoldi, Paolo Vitulo, D. Torretta, J. S. Kang, G. Bellini, S. Sarwar, T. Handler, L. Perasso, R. Culbertson, G. R. Blackett, I. Gaines, Daniele Pedrini, P. Inzani, Gianluigi Boca, Senta Greene, J. F. Ginkel, J. F. Filasetta, P. H. Garbincius, K. Y. Kim, G. N. Kim, B. Gobbi, Paul Sheldon, V. Paolone, J. R. Wilson, Alan D. Lopez, M. S. Nehring, Marco Giammarchi, J. N. Butler, James E Wiss, F. Leveraro, T. F. Lin, F. Davenport, L. A. Garren, Randy Ruchti, V. Arena, Gianluca Alimonti, S. Cihangir, B. O'Reilly, S. Shukla, and R. Diaferia

Subjects
Physics, Particle decay, High energy, Particle physics, Meson, Life span, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Hadron, Bremsstrahlung, General Physics and Astronomy, Photon beams
Abstract

A precise measurement of the [ital D][sub [ital s]][sup [plus minus]] meson lifetime is reported. The data were accumulated by the high energy photoproduction experiment E687 at Fermilab in the 1990--1991 fixed target run. The measurement has been done using 900 fully reconstructed [ital D][sub [ital s]][sup [plus minus]][r arrow][phi][pi][sup [plus minus]] decays. The lifetime of the [ital D][sub [ital s]][sup [plus minus]] meson is measured to be 0.475[plus minus]0.020[plus minus]0.007 ps.

Published
1993

30. A measurement of Γ (DS+ → φμ+ν) /Γ (DS+ → φπ+)

Author

J. S. Kang, D. L. Puseljic, A. Sala, S. Shukla, Robert Gardner, P. H. Garbincius, Senta Greene, J. A. Swiatek, S. Sala, M. Pisharody, Stephen A. Gourlay, C. Dallapiccola, B. Gobbi, G. Bellini, T. F. Lin, Gianluigi Boca, Daniele Pedrini, N. M. Cason, B. O'Reilly, Luigi Moroni, Paolo Vitulo, S. Cihangir, Z. Y. Wu, K. Y. Kim, P. Inzani, D. Claes, I. Gaines, A. E. Kreymer, P. Lebrun, B. G. Cheon, Gabriele Gianini, W. D. Shephard, Stefano Bianco, F. Davenport, S. P. Ratti, D. J. Harding, Paul Sheldon, Alan D. Lopez, Cristina Riccardi, J. F. Ginkel, Marco Giammarchi, J. N. Butler, L. Garren, E. Meroni, G. P. Grim, Gianluca Alimonti, M. Vittone, J. F. Filaseta, M. Di Corato, D. Buchholz, C. J. Kennedy, Randy Ruchti, D. Torretta, P. H. Kasper, T. Handler, John Perry Cumalat, R. Greene, Fabrizio Fabbri, G. N. Kim, A. Zallo, L. Cinquini, P. M. Yager, Willard Johns, H. W.K. Cheung, S. Sarwar, V. S. Paolone, C. Castoldi, Sandra Malvezzi, J. M. Bishop, James R. Wilson, B. Caccianiga, P. L. Frabetti, L. Perasso, R. Culbertson, Dario Menasce, G. R. Blackett, V. Arena, M. S. Nehring, James E Wiss, and F. Leveraro

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Branching fraction, Fermilab, lcsh:Physics, lcsh:QC1-999
Abstract

Fermilab high-energy photoproduction experiment E687 measures a branching ratio of Γ ( D S + → φμ + ν ) / Γ ( D S + → φμ + ) = 0.58 ± 0.17 (stat) ± 0.07 (sys). This branching ratio is combined with theoretical inputs to obtain a new measurement of the D S + absolute branching ratio of Γ ( D S + → φμ + ) / Γ ( D S + → all) = 0.031 ± 0.009 (stat 0.005 (sys) ± 0.004 (theoretical).

Published
1993

31. Studies of correlations in high energy photoproduction

Author

V. Arena, D. Buccholz, A. Spallone, J. F. Ginkel, R. Yoshida, J. N. Butler, Paolo Vitulo, H. Mendez, Paul Sheldon, J. F. Filasetta, D. J. Harding, S. Sala, B. O'Reilly, F. Leveraro, K. Lingel, J. D. Cunningham, C. J. Kennedy, C. W. Bogart, V. S. Paolone, S. Shukla, James E Wiss, J. S. Kang, G. Jaross, I. Gaines, Willard Johns, P. M. Yager, M. Vittone, P. H. Garbincius, S. Culy, L. Garren, E. Meroni, R. Greene, B. Caccianiga, G. P. Grim, S. Sarwar, Gianluca Alimonti, Senta Greene, K. Y. Kim, A. Zallo, T. F. Lin, Sandra Malvezzi, M. Pisharody, Stephen A. Gourlay, H. W.K. Cheung, James R. Wilson, P. L. Frabetti, J. K. Busenitz, Marco Giammarchi, S. Cihangir, D. Torretta, S. P. Ratti, D. L. Puseljic, A. Sala, Dario Menasce, Alan D. Lopez, B. Gobbi, E. J. Mannel, Gabriele Gianini, Daniele Pedrini, G. Bellini, R. J. Mountain, P. Inzani, L. Perasso, R. Culbertson, D. Claes, T. Handler, P. H. Kasper, W. D. Shephard, Stefano Bianco, Cristina Riccardi, F. Davenport, Z. Y. Wu, Gianluigi Boca, B. G. Cheon, Luigi Moroni, Robert Gardner, Randy Ruchti, J. A. Swiatek, Fabrizio Fabbri, G. N. Kim, A. E. Kreymer, P. Lebrun, M. Di Corato, C. Castoldi, S. Park, N. M. Cason, G. R. Blackett, John Perry Cumalat, L. Cinquini, J. M. Bishop, M. S. Nehring, C. Dallapiccola, and M. E. Zanabria

Subjects
Hadronic decay, Physics, Nuclear and High Energy Physics, High energy, Meson, High Energy Physics::Phenomenology, Nuclear Theory, Spectral line, Nuclear physics, Pair production, Transverse momentum, High Energy Physics::Experiment, Fermilab, Atomic physics, Nuclear Experiment
Abstract

Analysis of data from the Fermilab high energy photoproduction experiment E687 for events containing fully and partially reconstructed pairs of charmed mesons is presented. Correlations from D D pairs are used to study production dynamics.

Published
1993

32. Analysis of the decay mode

Author

P.L. Frabetti, G.P. Grim, V.S. Paolone, P.M. Yager, C.W. Bogart, H.W.K. Cheung, S. Culy, J.P. Cumalat, C. Dallapicola, J.F. Ginkel, S.V. Greene, W.E. Johns, M.S. Nehring, J.N. Butler, S. Cihangir, I. Gaines, P.H. Garbincius, L. Garren, S. Gourlay, D.J. Harding, P. Kasper, A. Kreymer, P. Lebrun, H. Mendez, S. Shukla, S. Bianco, F.L. Fabbri, S. Sarwar, A. Spallone, A. Zallo, R. Culbertson, R.W. Gardner, R. Greene, G. Jaross, K. Lingel, J. Wiss, B.G. Cheon, J.S. Kang, K.Y. Kim, G. Alimonti, G. Bellini, B. Caccianiga, L. Cinquini, M. Di Corato, M. Giammarchi, P. Inzani, F. Leveraro, S. Malvezzi, D. Menasce, E. Meroni, L. Moroni, D. Pedrini, L. Perasso, S. Sala, D. Torretta, M. Vittone, F. Davenport, J.F. Filasetta, D. Buchholz, D. Claes, B. Gobbi, B. O'Reilly, S. Park, R. Yoshida, J.M. Bishop, J.K. Busenitz, N.M. Cason, J.D. Cunningham, C.J. Kenney, G.N. Kim, T.F. Lin, E.J. Mannel, R.J. Mountain, D.L. Puseljic, R.C. Ruchti, W.D. Shephard, J.A. Swiatek, Z.Y. Wu, M.E. Zanabria, V. Arena, G. Boca, C. Castoldi, R. Diaferia, G. Gianini, S.P. Ratti, C. Riccardi, P. Vitulo, A. Lopez, J.R. Wilson, G.R. Blackett, M. Pisharody, T. Handler, and P.D. Sheldon

Subjects
Semileptonic decay, Physics, Nuclear physics, Nuclear and High Energy Physics, chemistry, Branching fraction, Mass spectrum, Mode (statistics), Form factor (quantum field theory), chemistry.chemical_element, Beryllium, Neutrino
Published
1993

33. A wide band photon beam at the Fermilab Tevatron to study heavy flavors

Author

N. M. Cason, S. Shukla, J. N. Butler, P. D'Angelo, R. W. Gardner, R. Currier, F. Leveraro, A. E. Kreymer, P. H. Garbincius, J. D. Cunningham, P. Lebrun, D. Buchholz, Stephen A. Gourlay, M. Vittone, B. Caccianiga, S. Cihangir, Daniele Pedrini, R. J. Mountain, L. Perasso, J. K. Busenitz, M. Di Corato, C. W. Bogart, Sandra Malvezzi, D. L. Puseljic, A. Sala, A. Zallo, I. Gaines, P. L. Frabetti, E. J. Mannel, P. H. Kasper, P. Inzani, D. Claes, Dario Menasce, P.F. Manfredi, Marco Giammarchi, S. Sala, Francesco Ragusa, C. Castoldi, G. Jaross, John Perry Cumalat, Willard Johns, S. Park, L. Cinquini, K. Lingel, Fabrizio Fabbri, James E Wiss, C. J. Kennedy, A. Spallone, W. D. Shephard, Stefano Bianco, D. J. Harding, Randy Ruchti, J. M. Bishop, Z. Y. Wu, M. E. Zanabria, E. Meroni, Gianluca Alimonti, S. Culy, R. Justice, R. Yoshida, B. Gobbi, G. Bellini, F. Davenport, H. W.K. Cheung, W.R. Gavaletti, D. Torretta, and Luigi Moroni

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Columbia university, Library science, Wide band, Fermilab, Photon beam, Beam electron, Instrumentation
Abstract

13 Present address: Vector Research Company, 6903 Rockledge Drive, Bethesda, MD 20817, USA . Present address : University of North Carolina-Asheville, Asheville, NC 28804, USA . Present address: STX Inc., 4400 Forbes Blvd ., Lanham, MD 20706, USA . Present address : University of Colorado, Boulder, CO 80309, USA . Present address : Fermilab, Batavia, IL 60510, USA. Present address : Dipartimento di Elettronica, University dl Pavia, Pavia, Italy. Present address : Dipartimento di Fisica Nucleate e Teorica dell'Universita and INFN Pavia, 1-27100 Pavia, Italy Present address : State University of New York, Stony Brook, NY 11794, USA. Present address : NIKHEF-H, 1009 DB, Amsterdam, The Netherlands . Present address : University of Alabama, Tuscaloosa, AL 35487, USA . Present address : Brandeis University, Waltham, MA 02254, USA. Present address : University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. Present address : Nevis Labs, Columbia University, Irvington, NY 10533, USA.

Published
1993

34. Measurement of the lifetime of theΞc0

Author

Alan D. Lopez, S. Sarwar, Sandra Malvezzi, S. Sala, P. L. Frabetti, N. M. Cason, G. Alimonti, A. E. Kreymer, P. Lebrun, I. Gaines, Randy Ruchti, Z. Y. Wu, Robert Gardner, W. D. Shepard, D. L. Puseljic, V. S. Paolone, B. O'Reilly, B. G. Cheon, M. Vittone, J. S. Kang, S. Shukla, M. Di Corato, Senta Greene, J. F. Ginkel, C. J. Kennedy, J. A. Swiatek, James E Wiss, L. Cinquini, D. Buchholz, John Perry Cumalat, J. N. Butler, J. F. Filasetta, R. Diaferia, Luigi Moroni, T. F. Lin, S. Cihangir, P. H. Garbincius, Stefano Bianco, P. Inzani, A. Zallo, P. M. Yager, Daniele Pedrini, Paolo Vitulo, D. Torreta, S. P. Ratti, B. Gobbi, G. N. Kim, G. Bellini, J. M. Bishop, P. H. Kasper, Dario Menasce, Cristina Riccardi, M. Pisharody, R. Greene, D. Claes, L. Perasso, C. Castoldi, V. Arena, H. W.K. Cheung, G. R. Blackett, Gianluigi Boca, Marco Giammarchi, L. Garren, E. Meroni, G. P. Grim, Fabrizio Fabbri, B. Caccianiga, Gabriele Gianini, A. Sala, M. S. Nehring, D. J. Harding, F. Davenport, Stephen A. Gourlay, C. Dallapiccola, K. Y. Kim, T. Handler, R. Culbertson, Paul Sheldon, F. Leveraro, Willard Johns, and James R. Wilson

Subjects
Physics, High energy, Particle physics, Meson, Hyperon, Analytical chemistry, General Physics and Astronomy, Lambda baryon, Calculation methods, Xi baryon
Abstract

A measurement of the lifetime of the charmed strange baryon [Xi][sub [ital c]][sup 0] is presented. The data were accumulated by the Fermilab high energy photoproduction experiment E687. The measurement has been made using 42[plus minus]10 [Xi][sub [ital c]][sup 0][r arrow][Xi][sup [minus]][pi][sup +] decays. The lifetime of the [Xi][sub [ital c]][sup 0] is measured to be 0.101[sub [minus]0.017][sup +0.025][plus minus]0.005 ps and its mass is measured to be 2462.1[plus minus]3.1[plus minus]1.4 MeV/[ital c][sup 2].

Published
1993

35. Measurement of theΛc+lifetime

Author

P. L. Frabetti, H. W. K. Cheung, J. P. Cumalat, C. Dallapiccola, J. F. Ginkel, S. V. Greene, W. E. Johns, M. S. Nehring, J. N. Butler, S. Cihangir, I. Gaines, L. Garren, P. H. Garbincius, S. A. Gourlay, D. J. Harding, P. Kasper, A. Kreymer, P. Lebrun, S. Shukla, S. Bianco, F. L. Fabbri, S. Sarwar, A. Zallo, R. Culbertson, R. W. Gardner, R. Greene, J. Wiss, G. Alimonti, G. Bellini, B. Caccianiga, L. Cinquini, M. Di Corato, M. Giammarchi, P. Inzani, F. Leveraro, S. Malvezzi, D. Menasce, E. Meroni, L. Moroni, D. Pedrini, L. Perasso, A. Sala, S. Sala, D. Toretta, M. Vittone, D. Buchholz, D. Claes, B. Gobbi, B. O’Reilly, J. M. Bishop, N. M. Cason, C. J. Kennedy, G. N. Kim, T. F. Lin, E. J. Mannel, D. L. Puseljic, R. C. Ruchti, W. D. Shephard, J. A. Swiatek, Z. Y. Wu, V. Arena, G. Boca, C. Castoldi, R. Diaferia, G. Gianini, S. P. Ratti, C. Riccardi, P. Vitulo, A. Lopez, G. P. Grim, V. S. Paolone, P. M. Yager, J. R. Wilson, P. D. Sheldon, F. Davenport, J. F. Filasetta, G. R. Blackett, M. Pisharody, T. Handler, B. G. Cheon, J. S. Kang, and K. Y. Kim

Subjects
Charmed baryons, Physics, Nuclear physics, Particle decay, High energy, Meson, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Analytical chemistry, General Physics and Astronomy, Charge (physics), Lambda, Calculation methods
Abstract

A precise measurement of the [Lambda][sub [ital c]][sup +] lifetime using approximately 1340 fully reconstructed [Lambda][sub [ital c]][sup +][r arrow][ital pK][sup [minus]][pi][sup +] and charge conjugate decays is presented. The data were accumulated by the Fermilab high energy photoproduction experiment E687. The lifetime of the [Lambda][sub [ital c]][sup +] is measured to be 0.215[plus minus]0.016[plus minus]0.008 ps.

Published
1993

36. First evidence of

Author

J. F. Ginkel, B. G. Cheon, S. Sarwar, Sandra Malvezzi, J. F. Filasetta, Daniele Pedrini, C. J. Kennedy, P. M. Yager, P. L. Frabetti, A. Sala, Dario Menasce, G. R. Blackett, D. Torretta, P. Inzani, Sergio P Ratti, C. Dallapiccola, D. Buchholz, I. Gaines, John Perry Cumalat, M. Pisharody, N. M. Cason, L. Cinquini, W. D. Shephard, Stefano Bianco, P. H. Garbincius, E. Meroni, James R. Wilson, James E Wiss, F. Davenport, Cristina Riccardi, G. P. Grim, Gianluca Alimonti, Stephen A. Gourlay, W. E. Johns, J. M. Bishop, J. S. Kang, Nehring, D. L. Puseljic, B. O'Reilly, K. Y. Kim, P. H. Kasper, V. Arena, Marco Giammarchi, Harry Cheung, D. J. Harding, F. Leveraro, Senta Greene, V. Paolone, R. Diaferia, B. Gobbi, Giulia Giannini, Paolo Vitulo, Joel N. Butler, Paul Sheldon, M. Vittone, Alan D. Lopez, Daniel R Claes, G. Boca, Rodney L. Greene, A. Zallo, B. Caccianiga, T. Handler, L. Perasso, R. Culbertson, S. Shukla, S. Cihangir, S. Sala, T. F. Lin, L. A. Garren, Fabrizio Fabbri, Z. Y. Wu, Randy Ruchti, G. Bellini, C. Castoldi, G. N. Kim, A. E. Kreymer, P. Lebrun, M. Di Corato, Robert Gardner, J. A. Swiatek, and Luigi Moroni

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, chemistry, Pi, Mass spectrum, chemistry.chemical_element, Beryllium, Omega
Published
1993

37. Description and performance of the Fermilab E687 spectrometer

Author

C. J. Kennedy, P. M. Yager, S. Culy, K. Kephart, D. Torretta, D. Buchholz, T. F. Lin, J. F. Ginkel, B. O'Reilly, G. N. Kim, Randy Ruchti, S. Cihangir, G. Molinari, A. E. Kreymer, Stephen A. Gourlay, V. Russo, N. M. Cason, Fabrizio Fabbri, Sandra Malvezzi, Z. Y. Wu, P. L. Frabetti, J. K. Busenitz, H. W.K. Cheung, V. S. Paolone, R. Currier, Dario Menasce, P. Lebrum, M. Diesburg, E. J. Mannel, J. D. Cunningham, R. Diaferia, James R. Wilson, P. Inzan, P. H. Kasper, P.F. Manfredi, J. N. Butler, J. F. Filasetta, M. Di Corato, S. P. Ratti, G. Schultz, L. Passamonti, B. Gobbi, James E Wiss, A. Spallone, P. D. Sheldon, C. Castoldi, E. Meroni, V. Giordano, G. Bellini, R. W. Gardner, Alan D. Lopez, Gianluca Alimonti, Paolo Vitulo, S. Park, F. Leveraro, P. D'Angelo, John Perry Cumalat, C. W. Bogart, Daniel R Claes, A. Cotta-Ramusino, Gianluigi Boca, J. M. Bishop, I. Gaines, H. Mendez, V. Arena, Marco Giammarchi, E. Erdos, P. H. Garbincius, M. E. Zanabria, G. Jaross, K. Lingel, M. Giardoni, Willard Johns, F. Davenport, S. Shukla, Daniele Pedrini, W. D. Shephard, Stefano Bianco, R. Yoshida, Francesco Ragusa, W.R. Cavaletti, M. Vittone, Cristina Riccardi, J. A. Swiatek, C. Dallapiccola, A. Zallo, Luigi Moroni, R. J. Mountain, L. Perasso, R. Culbertson, B. Baumbaugh, D. J. Harding, D. L. Puseljic, A. Sala, Sten Hansen, R. Justice, R. Tiden, and P. Coteus

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, Meson, Physics::Instrumentation and Detectors, Tracking (particle physics), Charged particle, Particle identification, Baryon, Nuclear physics, High Energy Physics::Experiment, Charm (quantum number), Nuclear Experiment, Instrumentation
Abstract

The magnetic spectrometer and charged particle tracking system used in Fermilab experiment 687 to study the photoproduction and decay of charm particles are described in detail. The photons are produced by a wideband electron beam which can operate at energies up to 600 GeV/ c . The spectrometer consists of a high resolution silicon microstrip detector, a large aperture dipole magnet, proportional chambers, a second large aperture dipole, and more proportional chambers. Three multi-cell threshold Cherenkov counters provide charged particle identification. The tracking system is capable of resolving the secondary decay vertices of charm and beauty mesons and baryons from the primary interaction vertex. It also determines the invariant mass of the multibody final states of particles containing heavy quarks with excellent resolution. The particle identification system allows one to identify kaons and protons present in these final states clearly. This collection of detectors produces very clean signals for charm particles and permits one to make many cross checks of the apparatus. The performance is illustrated for a variety of charm signals. Of particular interest is a description of the tracking through the silicon microstrip detector and its use in isolating downstream decay vertices. Two complementary approaches to the reconstruction of secondary decay vertices are presented and insight is gained by comparing their strengths and weaknesses.

Published
1992

38. Study of D0→KS0π+π− and D0→KS0K+K− in high energy photoproduction

Author

D. Buchholz, P. H. Kasper, Alan D. Lopez, C. W. Bogart, E. Meroni, J. N. Butler, H. Mendez, N. M. Cason, F. Davenport, J. R. Wilson, D. L. Puseljic, Paolo Vitulo, W. D. Shephard, Stefano Bianco, L. Perasso, P. H. Garbincius, P. D. Sheldon, S. P. Ratti, Sandra Malvezzi, P. L. Frabetti, M. Enorini, I. Gaines, John Perry Cumalat, G. Alimonti, A. E. Kreymer, P. Lebrun, D. J. Harding, H. W.K. Cheung, Luigi Moroni, J. M. Bishop, M. Di Corato, C. J. Kennedy, R. J. Mountain, Daniele Pedrini, C. Castoldi, R. Culbertson, G. Bellini, M. E. Zanabria, M. Vittone, S. Park, S. Culy, Stephen A. Gourlay, A. Zallo, J. K. Busenitz, A. Spallone, B. Gobbi, A. Sala, F. L. Fabbri, R. W. Gardner, G. Boca, Marco Giammarchi, E. J. Mannel, S. Sala, K. Lingel, James E Wiss, Randy Ruchti, Dario Menasce, R. Yoshida, J. D. Cunningham, G. Jaross, F. Leveraro, and D. Torretta

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, High energy, Amplitude, Dalitz plot, Fermilab
Abstract

Analysis of the resonant and non-resonant branching fractions for the decays D 0 →K S 0 π + π − and D 0 →K S 0 K + K − is presented. For the D 0 →K S 0 π + π − decay, a fit to the observed Dalitz plot was performed to determine the complex amplitudes of the sub-component modes. For the D 0 →K S 0 K + K − decay, measurements of the branching ratios D 0 →K S 0 K + K − (inclusive), D 0 →K S 0 φ , and D 0 →K S 0 (K + K − ) non- φ relative to the D 0 →K S 0 π + π − mode are reported. The data were collected by the Fermilab high energy photoproduction experiment E687.

Published
1992

39. Measurement of the decays D0 → π+π+π−π−, D0 → K−K+ and

Author

S. P. Ratti, V. Arena, A. Zallo, F. L. Fabbri, W. D. Shephard, Stefano Bianco, E. J. Mannel, S. Sala, K. Lingel, R. J. Mountain, C. W. Bogart, L. Perasso, R. Culbertson, A. Spallone, P. D. Sheldon, J. N. Butler, H. Mendez, N. M. Cason, C. J. Kennedy, J. R. Wilson, M. Vittone, D. L. Puseljic, A. Sala, Daniele Pedrini, R. Yoshida, R. W. Gardner, Gianluca Alimonti, F. Davenport, Marco Giammarchi, G. Bellini, James E Wiss, F. Leveraro, D. J. Harding, P. Inzani, A. E. Kreymer, P. Lebrun, G. Jaross, Sandra Malvezzi, S. Culy, D. Buchholz, H. W.K. Cheung, P. L. Frabetti, I. Gaines, B. Gobbi, Dario Menasce, M. Di Corato, M. E. Zanabria, Stephen A. Gourlay, J. K. Busenitz, P. H. Garbincius, P. H. Kasper, Alan D. Lopez, C. Castoldi, John Perry Cumalat, Luigi Moroni, S. Park, J. M. Bishop, Paolo Vitulo, J. D. Cunningham, D. Torretta, and Randy Ruchti

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Fermilab
Abstract

We present measurements of the branching ratios for two Cabibbo suppressed decays of the D0 meson, D0 → π+π+π−π− and D0 → K−K+, and for the decay D + s → фπ + π + π − . The physics signals were extracted from a data sample consisting of 60 million triggers, collected by Fermilab Photoproduction Experiment E687 from December 1987 to February 1988. The relative branching ratios are measured to be: Γ(D0 → 4π)/Γ(D0 → K3π) = 0.108±0.024±0.008, Γ(D0 → KK)/Γ(D0 → Kπ) = 0.138±0.027 ±0.010 and Γ( D s → ф3π)/Γ( D s → фπ) = 0.58±0.20±0.10 .

Published
1992

40. A microstrip vertex detector to identify heavy flavour decays

Author

S. Sala, M. Di Corato, P. Inzani, A. Igiuni, G. Bacchiocchi, S. Grabar, Marco Giammarchi, D. Pedrini, W. R. Cavaletti, L. Moroni, P.F. Manfredi, M. Vittone, G. Bellini, P. D'Angelo, S. Malvezzi, and Dario Menasce

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Track (disk drive), Resolution (electron density), Flavour, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Microstrip, Nuclear physics, High Energy Physics::Experiment, Vertex detector, Fermilab, Instrumentation, Event reconstruction
Abstract

The design, construction and operation of a high resolution microstrip vertex detector used in the Fermilab experiment E687 is discussed and the performances in detection, track and event reconstruction are presented.

Published
1991

41. Measurement of Λ+c and D+s lifetimes

Author

C. Castoldi, J. N. Butler, B. Gobbi, H. Mendez, S. Park, Gianluca Alimonti, G. Jaross, F. Davenport, C. W. Bogart, A. Spallone, J. D. Cunningham, P. Coteus, A. E. Kreymer, P. Lebrun, I. Gaines, Randy Ruchti, G. Bellini, A. Sala, P. H. Garbincius, M. Di Corato, M. Vittone, Daniele Pedrini, Sandra Malvezzi, A. Zallo, Marco Giammarchi, M. Diesburg, S. P. Ratti, P. L. Frabetti, P. Inzani, D. J. Harding, W. D. Shephard, Stefano Bianco, P. F. Manfredi, C. J. Kennedy, R. Yoshida, Luigi Moroni, S. Sala, N. M. Cason, E. J. Mannel, F. L. Fabbri, M. E. Zanabria, D. Buchholz, S. Culy, P. D. Sheldon, D. Kaplan, P. H. Kasper, J. R. Wilson, Alan D. Lopez, K. Lingel, D. L. Puseljic, R. J. Mountain, L. Perasso, R. Culbertson, Stephen A. Gourlay, J. K. Busenitz, D. Torretta, H. W.K. Cheung, R. W. Gardner, James E Wiss, M. Enorini, John Perry Cumalat, J. M. Bishop, and Dario Menasce

Subjects
Physics, Nuclear and High Energy Physics, chemistry, chemistry.chemical_element, Fermilab, Atomic physics, Beryllium
Abstract

Measurements of the lifetimes of the Λ+c decaying into pK−π+ and of the D+s decaying into φπ+ are presented. The data were accumulated in the Fermilab Wide-Band photoproduction experiment E687. The lifetimes of the Λ+c and the D+s are measured to be (0.20±0.03±3)× 10−12s and (0.50±0.06±0.03) × 10−12s respectively.

Published
1990

42. Performance of prototype BTeV silicon pixel detectors in a high energy pion beam

Author

Jing Wang, Gustavo Cancelo, Marina Artuso, E.E. Gottschalk, R. Coluccia, G. Cardoso, B.K. Hall, S. Sala, Dario Menasce, R.J. Yarema, J. N. Butler, C. R. Newsom, Harry Cheung, J. Hoff, S. Zimmerman, J.A. Appel, P. A. Kasper, A. Colautti, D. C. Christian, A. Mekkaoui, Simon Kwan, Robert K. Kutschke, M. Di Corato, and G. Chiodini

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Silicon, Spectrometer, Pixel, business.industry, hep-ex, Physics::Instrumentation and Detectors, Monte Carlo method, chemistry.chemical_element, FOS: Physical sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Optics, Pion, chemistry, High Energy Physics::Experiment, Fermilab, business, Nuclear Experiment, Instrumentation, Image resolution, Energy (signal processing)
Abstract

The silicon pixel vertex detector is a key element of the BTeV spectrometer. Sensors bump-bonded to prototype front-end devices were tested in a high energy pion beam at Fermilab. The spatial resolution and occupancies as a function of the pion incident angle were measured for various sensor-readout combinations. The data are compared with predictions from our Monte Carlo simulation and very good agreement is found., 24 pages, 20 figures

Published
2001

43. Beam Test of BTeV Pixel Detectors

Author

J.C Wang, J.A Appel, M Artuso, J.N Butler, G Cancelo, G Cardoso, H Cheung, G Chiodini, D.C Christian, A Colautti, R Coluccia, M Di Corato, E.E Gottschalk, B.K Hall, J Hoff, P.A Kasper, R Kutschke, S.W Kwan, A Mekkaoui, D Menasce, C Newsom, S Sala, R Yarema, and S Zimmermann

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Pixel, Silicon, Spectrometer, business.industry, Physics::Instrumentation and Detectors, Monte Carlo method, Detector, chemistry.chemical_element, FOS: Physical sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Optics, chemistry, High Energy Physics::Experiment, Fermilab, business, Instrumentation, Image resolution, Beam (structure)
Abstract

The silicon pixel vertex detector is one of the key elements of the BTeV spectrometer. Detector prototypes were tested in a beam at Fermilab. We report here on the measured spatial resolution as a function of the incident angles for different sensor-readout electronics combinations. We compare the results with predictions from our Monte Carlo simulation., Comment: 7 pages, 5 figures, Invited talk given by J.C. Wang at "Vertex 2000, 9th International Workshop on Vertex Detectors", Michigan, Sept 10-15, 2000. To be published in NIM A

Published
2000
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44. Measurment of the masses and widths of L=1 charmed mesons

Author

M. S. Nehring, James R. Wilson, M. Pisharody, John Perry Cumalat, A. E. Kreymer, J. F. Ginkel, L. Cinquini, S. Cihangir, S. Sala, C. J. Kennedy, G. Bellini, V. Paolone, Gabriele Gianini, B. Gobbi, J. M. Bishop, J. N. Butler, Alan D. Lopez, D. Torretta, D. J. Harding, P. M. Yager, W. D. Shephard, Stefano Bianco, P. H. Garbincius, N. M. Cason, F. Davenport, G. R. Blackett, P. Lebrun, Stephen A. Gourlay, M. Di Corato, S. Shukla, Cristina Riccardi, V. Arena, Z. Y. Wu, D. R. Claes, Robert Gardner, Marco Giammarchi, M. Vittone, L. Perasso, R. Culbertson, J. Filaseta, B. O'Reilly, D. L. Puseljic, A. Sala, T. F. Lin, D. Buchholz, Harry Cheung, L. A. Garren, G. N. Kim, K. Y. Kim, A. Zallo, J. A. Swiatek, P. H. Kasper, Randy Ruchti, F. Leveraro, C. Castoldi, Paul Sheldon, Fabrizio Fabbri, B. Caccianiga, James E Wiss, Paolo Vitulo, E. Meroni, G. P. Grim, Gianluca Alimonti, Daniele Pedrini, P. Inzani, B. G. Cheon, S. Sarwar, Sandra Malvezzi, P. L. Frabetti, Dario Menasce, J. S. Kang, W. E. Johns, Senta Greene, G. Boca, Richard L. Greene, I. Gaines, S. P. Ratti, C. Dallapiccola, T. Handler, and Luigi Moroni

Subjects
Physics, Particle physics, Crystallography, Meson, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, General Physics and Astronomy, MathematicsofComputing_DISCRETEMATHEMATICS
Abstract

We report the measurement of masses and widths of the following [ital L]=1 charm mesons by the E687 Collaboration at Fermilab: a [ital D][sub 2][sup *0] state of mass (width) 2453[plus minus]3[plus minus]2 (25[plus minus]10[plus minus]5) MeV/[ital c][sup 2] decaying to [ital D][sup +][pi][sup [minus]], a [ital D][sub 2][sup *+] state of mass (width) 2453[plus minus]3[plus minus]2 (23[plus minus]9[plus minus]5) MeV/[ital c][sup 2] decaying to [ital D][sup 0][pi][sup +], a [ital D][sub 1][sup 0] state of mass (width) 2422[plus minus]2[plus minus]2 (15[plus minus]8[plus minus]4) MeV/[ital c][sup 2] decaying to [ital D][sup *+][pi][sup [minus]], and a [ital D][sub [ital s]1][sup +] state of mass 2535.0[plus minus]0.6[plus minus]1.0 MeV/[ital c][sup 2] and width [lt]3.2 MeV/[ital c][sup 2] at 90% confidence level, decaying to [ital D][sup *+][ital K][sub [ital s]][sup 0] and [ital D][sup *0][ital K+].

Published
1994

45. Measurement of the mass and lifetime of the Xi c+

Author

M. S. Nehring, J. F. Ginkel, B. O'Reilly, M. Pisharody, James R. Wilson, C. J. Kennedy, L. Garren, E. Meroni, J. N. Butler, John Perry Cumalat, G. P. Grim, J. F. Filasetta, P. Lebrun, Senta Greene, Z. Y. Wu, Gabriele Gianini, P. H. Garbincius, G. N. Kim, P. M. Yager, Sandra Malvezzi, B. G. Cheon, M. Vittone, F. Leveraro, Randy Ruchti, P. L. Frabetti, D. L. Puseljic, S. Shukla, Willard Johns, N. M. Cason, C. Castoldi, Paolo Vitulo, J. M. Bishop, S. P. Ratti, P. Inzani, Dario Menasce, V. S. Paolone, A. Zallo, S. Sarwar, D. Torretta, L. Cinquini, Fabrizio Fabbri, Daniele Pedrini, B. Caccianiga, James E Wiss, C. Dallapiccola, D. J. Harding, Robert Gardner, I. Gaines, R. Diaferia, D. Claes, S. Cihangir, G. R. Blackett, B. Gobbi, G. Bellini, Paul Sheldon, G. Alimonti, A. E. Kreymer, J. A. Swiatek, A. Sala, V. Arena, J. S. Kang, F. Davenport, Stephen A. Gourlay, Gianluigi Boca, M. Di Corato, W. D. Shephard, Stefano Bianco, Cristina Riccardi, Luigi Moroni, L. Perasso, Alan D. Lopez, D. Buchholz, Marco Giammarchi, P. H. Kasper, S. Sala, T. F. Lin, R. Culbertson, T. Handler, K. Y. Kim, R. Greene, and H. W.K. Cheung

Subjects
Nuclear physics, Physics, Particle physics, Pion, chemistry, General Physics and Astronomy, chemistry.chemical_element, Fermilab, Beryllium, Charged particle
Abstract

Measurements of the mass and lifetime of Ξ c + decaying into Ξ - π + π + are presented. The data were accumulated by the Fermilab high-energy photoproduction experiment E687. The mass of the Ξ c + is measured to be 2464.4 ± 2.0 ± 1.4 MeV/c 2 and the lifetime is measured to be 0.41 +0.11-0.08 ± 0.02 ps

Published
1993

46. Two-particle correlations in pion-nucleus interactions at 40 GeV/c

Author

L. K. Litkin, K. P. Vishnievskaja, F. Palombo, S. Otwinowski, P. L. Frabetti, A. T. Abrosimov, V. P. Lobanova, V. I. Nikanorov, L. Moroni, G. Bellini, E. Meroni, and M. Di Corato

Subjects
Physics, Particle physics, Hydrogen, Quark model, General Physics and Astronomy, chemistry.chemical_element, Multiplicity (mathematics), Nuclear physics, Pion, medicine.anatomical_structure, Correlation function, chemistry, Pseudorapidity, medicine, Particle, Nucleus
Abstract

Multiplicity distributions and two-particle correlation functions are presented for shower particles with pseudorapidity η>1 produced in π- interactions on C, Al, Cu, Pb targets at 40 GeV/c. The results are in the correlation function berween the data on nuclei and on hydrogen. The data are compared with the predictions of the additive quark model and the quasi-eikonal model.

Published
1982

47. Analysis of the angular distribution in the pion-carbon elastic semi-coherent scattering at 40 GeV/c

Author

P. D'Angelo, E. Meroni, E. Albini, P. L. Frabetti, Francesco Ragusa, A.A. Tjapkin, I. L. Pisarev, O.A. Zaimidoroga, S. Sala, T. Bettinazzi, G. Vegni, A. Sala, L. Litpkin, F. Palombo, S. Stchkov, L.P. Chernenko, M. Di Corato, C. Meroni, V. V. Vishniakov, and Yu. Ivanshin

Subjects
Physics, Nuclear physics, Elastic scattering, Pion, chemistry, Meson, Scattering, Hadron, General Physics and Astronomy, chemistry.chemical_element, Elementary particle, Carbon, Boson
Published
1980

48. Study of backward-produced protons in π−-nucleus interactions at 40 GeV/c

Author

A.A. Tyapkin, I. N. Vasilevsky, V. V. Sishniakov, E. Albini, P. L. Frabetti, F. Palombo, M. Di Corato, I. L. Pisarev, G. Bellini, L.P. Chernenko, V.V. Antipov, A.G. Galperin, V. A. Moiseenko, Vladimir Petrov, L.K. Lytkin, O. A. Kropina, O. Zaimidoroga, and M. Vittone

Subjects
Physics, Nuclear physics, medicine.anatomical_structure, Proton, Nuclear Theory, Structure function, medicine, General Physics and Astronomy, Incident energy, Atomic physics, Nuclear Experiment, Nucleon, Nucleus
Abstract

The backward production of protons in the reaction π−A → p↓X is studied at 40 GeV incident energy with the different nuclear targets : C, Cu, Pb. The structure function shows a slope independent of the target atomic weightA and slightly dependent on the proton production angle. The invariant cross-section, normalized to the nucleon, increases withA up to a plateau which varies with the incident energy. Finally the ratiosR = (FA/A)/(FC/AC) andn = ln(FA/FC)/ln(A/AC), whereF = (E/p2)(d2σ/(dp dΩ)), show a flat dependence on the momentum of the proton backward produced. These results are in favour of few-nucleon correlation models.

Published
1985

49. Evidence that absorption in the π+ π− π− system in nuclear matter is stronger in the JP = 0− than in the JP = 1+ state

Author

D. Websdale, M. Letheren, E. Polgar, P. G. Rancoita, F.X. Gentit, J.G. Lee, W. Wetzel, P. Astbury, J. Pernegr, G. Vegni, F. Palombo, K. Freudenreich, M. Di Corato, G. Bellini, P. Mühlemann, and W. Beusch

Subjects
Physics, Nuclear and High Energy Physics, Mass spectrum, State (functional analysis), Atomic physics, Absorption (chemistry), Nuclear matter, Atomic mass
Abstract

In the reaction π− + A → π+ π− π− + A at 15.1 GeV/c the coherently produced 3π mass spectrum has a broad peak around 1.1 GeV which consists mainly of a JP = 1+ state and of a smaller fraction of 0-. Comparing the observed dependence of the production of these diffractive states on the atomic weight A of the target nuclei with the optical model, we have studied the absorption of the produced states in nuclear matter. We have found the following values of the absorption cross-sections: σ2(0-) = 49−7+9 mb and σ2(1+) = 15.8−1.3+1.5 mb.

Published
1975

50. A vertex detector to search for beauty

Author

M. Giammarchi, L. Moroni, D. Pedrini, S. Sala, L. Perasso, Dario Menasce, E. Meroni, G. Bellini, P.F. Manfredi, and M. Di Corato

Subjects
Quark, Physics, Particle physics, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Frame (networking), General Engineering, Tevatron, Nuclear physics, Set (abstract data type), Physics::Accelerator Physics, High Energy Physics::Experiment, Fermilab, Vertex detector
Abstract

This paper describes a high resolution vertex detector designed to study heavy quarks and other rare phenomena at the FNAL Tevatron machine. Its performance is examined and discussed. This vertex detector will be used in the frame of experiment E-687, being set up at Fermilab.

Published
1984

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