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1. 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

2. 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

3. 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

4. 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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5. 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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6. 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

7. 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

8. 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

9. 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

10. Dalitz plot analysis of D_s+ and D+ decay to pi+pi-pi+ using the K-matrix formalism

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 and High Energy Physics, Particle physics, Meson, Scattering, Dalitz plot, FOS: Physical sciences, High Energy Physics - Experiment, Nuclear physics, Formalism (philosophy of mathematics), High Energy Physics - Experiment (hep-ex), High Energy Physics::Experiment, Spectroscopy, K matrix, Matrix formalism
Abstract

FOCUS results from Dalitz plot analysis of D_s+ and D+ to pi+pi-pi+ are presented. The K-matrix formalism is applied to charm decays for the first time to fully exploit the already existing knowledge coming from the light-meson spectroscopy experiments. In particular all the measured dynamics of the S-wave pipi scattering, characterized by broad/overlapping resonances and large non-resonant background, can be properly included. This paper studies the extent to which the K-matrix approach is able to reproduce the observed Dalitz plot and thus help us to understand the underlying dynamics. The results are discussed, along with their possible implications on the controversial nature of the sigma meson., To be submitted to Phys.Lett.B A misprint corrected in formula 3

Published
2003

11. Charm system tests of CPT and Lorentz invariance with FOCUS

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, 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, 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.L. 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, Particle physics, Nuclear and High Energy Physics, Meson, Lorentz transformation, media_common.quotation_subject, FOS: Physical sciences, Lorentz covariance, Asymmetry, Standard Model, High Energy Physics - Experiment, symbols.namesake, High Energy Physics - Experiment (hep-ex), Standard-Model Extension, symbols, Charm (quantum number), media_common
Abstract

We have performed a search for CPT violation in neutral charm meson oscillations. While flavor mixing in the charm sector is predicted to be small by the Standard Model, it is still possible to investigate CPT violation through a study of the proper time dependence of a CPT asymmetry in right-sign decay rates for $D^0\to K^-\pi^+$ and $\d0b\to K^+\pi^-$. This asymmetry is related to the CPT violating complex parameter $\xi$ and the mixing parameters $x$ and $y$: $A_{CPT}\propto{\rm Re} \xi y-{\rm Im} \xi x$ . Our 95% confidence level limit is $-0.0068, Comment: 12 pages 5 figures

Published
2003

12. Light Quark Spectroscopy Results from FOCUS and E687

Author

Bianco, Stefano, J.M. Link, L. Agostino, G. Alimonti, J.C. Anjos, V. Arena, R. Baldini-Ferroli, S. Barberis, I. Bediaga, G. Bellini, L. Benussi, J.M. Bishop, G. Boca, G. Bonomi, M. Boschini, D. Brambilla, D. Buchholz, J.N. Butler, B. Caccianiga, A. Calandrino, S. Carrillo, E. Casimiro, N.M. Cason, C. Castoldi, C. Cawlfield, A. Cerutti, H.W.K. Cheung, G. Chiodini, K. Cho, Y.S. Chung, S. Cihangir, L. Cinquini, D. Claes, N. Copty, R. Culbertson, J.P. Cumalat, C. Dallapiccola, P. D'Angelo, T.F. Davenport III, J.M. De Miranda, M. DiCorato, P. Dini, A.C. Dos Reis, L. Edera, D. Engh, C.J. Kennedy, S. Erba, F.L. Fabbri, P.L. Frabetti, I. Gaines, P.H. Garbincius, R. Gardner, L.A. Garren, M. Giammarchi, G. Gianini, J.F. Ginkel, B. Gobbi, C. Göbel, E. Gottschalk, S.A. Gourlay, R. Greene, T. Handler, D.J. Harding, H. Hernandez, M. Hosack, P. Inzani, W.E. Johns, J.S. Kang, P.H. Kasper, D.Y. Kim, G.N. Kim, B.R. Ko, A.E. Kreymer, A. Kryemadhi, R. Kutschke, J.W. Kwak, Y. Kwon, P. Lebrun, K.B. Lee, F. Leveraro, G. Liguori, T.F. Lin, A.M. Lopez, J. Magnin, S. Malvezzi, A. Massafferri, D. Menasce, H. Mendez, L. Mendez, M. Merlo, E. Meroni, M. Mezzadri, L. Milazzo, A. Mirles, E. Montiel, L. Moroni, S.S. Myung, M.S. Nehring, D. Olaya, B. O'Reilly, D. Pantea, V.S. Paolone, K.S. Park, H. Park, D. Pedrini, I.M. Pepe, L. Perasso, C. Pontoglio, F. Prelz, M. Purohit, D.L. Puseljic, J. Quinones, A. Rahimi, J.E. Ramirez, S.P. Ratti, M. Reyes, C. Riccardi, C. Rivera, M. Rovere, R.C. Ruchti, S. Sala, A. Sala, M. Sales, A. Sánchez-Hernández, I. Segoni, M. Sheaff, P.D. Sheldon, W.D. Shephard, S. Shukla, F. Simõ, K. Stenson, J.A. Swiatek, P. Torre, D. Torretta, C. Uribe, E.W. Vaandering, F. Vasquez, L. Viola, M. Vittone, P. Vitulo, M.S. Webster, J.R. Wilson, J. Wiss, Z.Y. Wu, P.M. Yager, A. Zallo, and Y. Zhang

Abstract

Using the FOCUS spectrometer (experiments 687 and 831 at Fermilab) we confirm the existence of a diffractively photoproduced enhancement in K^+K^- at 1750 MeV/c^2 with nearly 100 times the statistics of previous experiments. We also observe a narrow dip structure at 1.9 GeV/c2 in a study of diffractive photoproduction of the 3π^+3π^- final state.

Published
2002
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13. New Focus Results on Charm Mixing and CP Violation

Author

S. Bianco, J.M. Link, V.S. Paolone, M. Reyes, P.M. Yager, J.C. Anjos, I. Bediaga, C. Göbel, J. Magnin, J.M. De Miranda, I.M. Pepe, A.C. Dos Reis, F. SimãO, S. Carrillo, E. Casimiro, H. Mendez, A.Sànchez-Hernàndez, C. Uribe, F. Vasquez, L. Cinquini, J.P. Cumalat, J.E. Ramirez, B. O'Reilly, E.W. Vaandering, J.N. Butler, H.W.K. Cheung, I. Gaines, P.H. Garbincius, L.A. Garren, E. Gottschalk, S.A. Gourlay, P.H. Kasper, A.E. Kreymer, R. Kutschke, F.L. Fabbri, S. Sarwar, A. Zallo, C. Cawlfield, D.Y. Kim, K.S. Park, A. Rahimi, J. Wiss, R. Gardner, Y.S. Chung, J.S. Kang, B.R. Ko, J.W. Kwak, K.B. Lee, S.S. Myung, H. Park, G. Alimonti, M. Boschini, D. Brambilla, B. Caccianiga, A. Calandrino, 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, F. Prelz, M. Rovere, A. Sala, S. Sala, T.F. Davenport III, V. Arena, G. Boca, G. Bonomi, G. Gianini, G. Liguori, M. Merlo, D. Pantea, S.P. Ratti, C. Riccardi, P. Torre, L. Viola, P. Vitulo, H. Hernandez, A.M. Lopez, L. Mendez, A. Mirles, E. Montiel, D. Olaya, J. Quinones, C. Rivera, Y. Zhang, N. Copty, M. Purohit, J.R. Wilson, K. Cho, T. Handler, D. Engh, W.E. Johns, M. Hosack, M.S. Nehring, M. Sales, P.D. Sheldon, K. Stenson, M.S. Webster, M. Sheaff, and Y. Kwon

Abstract

We present a summary of recent results on CP violation and mixing in the charm quark sector based on a high statistics sample collected by photoproduction experiment FOCUS (E831 at Fermilab). We have measured the difference in lifetimes for the D0 decays: D0→K−π+ and D0→K−K+. This translates into a measurement of the yCP mixing parameter in the $\d0d0$ system, under the assumptions that K−K+ is an equal mixture of CP odd and CP even eigenstates, and CP violation is negligible in the neutral charm meson system. We verified the latter assumption by searching for a CP violating asymmetry in the Cabibbo suppressed decay modes D+→K−K+π+, D0→K−K+ and D0→π−π+. We show preliminary results on a measurement of the branching ratio Γ(D∗+→π+(K+π−))/Γ(D∗+→π+(K−π+)).

Published
2000
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14. Preliminary Results on Charmed Meson Spectroscopy

Author

J.M Link, V.S. Paolone, M. Reyes, P.M. Yager, J.C. Anjos, I. Bediaga, C. Göbel, J. Magnin, J.M. De Miranda, I.M. Pepe, A.C. Dos Reis, F. Simão, S. Carrillo, E. Casimiro, H. Mendez, A.Sánchez-Hernández, C. Uribe, F. Vasquez, L. Cinquini, J.P. Cumalat, J.E. Ramirez, B. O'Reilly, E.W. Vaandering, J.N. Butler, H.W.K. Cheung, I. Gaines, P.H. Garbincius, L.A. Garren, E. Gottschalk, S.A. Gourlay, P.H. Kasper, A.E. Kreymer, R. Kutschke, S. Bianco, F.L. Fabbri, S. Sarwar, A. Zallo, C. Cawlfield, D.Y. Kim, K.S. Park, A. Rahimi, J. Wiss, R. Gardner, Y.S. Chung, J.S. Kang, B.R. Ko, J.W. Kwak, K.B. Lee, S.S. Myung, H. Park, G. Alimonti, M. Boschini, D. Brambilla, B. Caccianiga, A. Calandrino, 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, F. Prelz, M. Rovere, A. Sala, S. Sala, T.F. Davenport III, V. Arena, G. Boca, G. Bonomi, G. Gianini, G. Liguori, M. Merlo, D. Pantea, S.P. Ratti, C. Riccardi, P. Torre, L. Viola, P. Vitulo, H. Hernandez, A.M. Lopez, L. Mendez, A. Mirles, E. Montiel, D. Olaya, J. Quinones, C. Rivera, Y. Zhang, N. Copty, M. Purohit, J.R. Wilson, K. Cho, T. Handler, D. Engh, W.E. Johns, M. Hosack, M.S. Nehring, M. Sales, P.D. Sheldon, K. Stenson, M.S. Webster, M. Sheaff, and Y. Kwon

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment
Abstract

We report the preliminary measurement by the FOCUS Collaboration (E831 at Fermilab) of masses and widths of the L=1 charm mesons D*^+_2 and D*^+_2 . The fit of the invariant mass distribution requires an additional term to account for a broad structure over background.

Published
2000
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15. BTeV: An Expression of interest for a heavy quark program at C0

Author

M. Artuso, P.H. Kasper, Paul Avery, L. Stutte, M. Alam, K. Sterner, P. Lebrun, V. Papavassiliou, M. Lohner, Sheldon Stone, R.A. Burnstein, M. Selen, Michael S. Webster, I. Gaines, H. Kagan, M. Sheaff, G. Boca, W. Selove, D.D. Koetke, Simon Kwan, H.A. Rubin, John Perry Cumalat, Paul Sheldon, M. He, J. Yarba, James Russ, J. N. Butler, P. Torre, D.M. Kaplan, S. Shapiro, A. Napier, J. Slaughter, T. Skwarnicki, Luigi Moroni, A. Lopez, N.M. Gelfand, P. H. Garbincius, M. Goldberg, Daniele Pedrini, L.M. Lederman, Harry Cheung, M. Procario, J. A. Appel, G. Liguori, Patricia McBride, T. Handler, K. Honscheid, S. Timm, R. Kutshcke, S. Mani, S. Sala, Yuichi Kubota, P. Kasper, Vincent J Smith, Alberto Santoro, D. Christian, J. Wiss, A. Wolf, X.Q. Yu, C. N. Brown, Dario Menasce, L A Garren, and T.Y. Chen

Subjects
Nuclear physics, Quark, Physics, Particle physics, Expression (computer science)
Published
1997

16. Study of hadronic five-body decays of charmed mesons involving KS0

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, 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
Nuclear physics, Physics, High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, Meson, Branching fraction, Hadron, Mass spectrum, FOS: Physical sciences, Substructure, High Energy Physics - Experiment
Abstract

We study the decay of D0 and D+s mesons into five-body final states including a KS0 and report the discovery of the decay mode Ds+→KS0KS0π+π+π−. The branching ratio for the new mode is Γ(D s + →K S 0 K S 0 π + π − π + ) Γ(D s + →K S 0 K − π + π + ) =0.102±0.029±0.029 . We also determine the branching ratio of Γ(D 0 →K S 0 π + π + π − π − ) Γ(D 0 →K S 0 π + π − ) =0.095±0.005±0.007 as well as an upper limit for Γ(D 0 →K S 0 K − π + π + π − ) Γ(D 0 →K S 0 π + π + π − π − ) (90% CL). An analysis of the resonant substructure for D0→KS0π+π+π−π− is also performed.

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