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Your search keyword '"K. O'Shaughnessy"' showing total 15 results
Start Over Author "K. O'Shaughnessy" Publisher american physical society (aps)
15 results on '"K. O'Shaughnessy"'

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

Author

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

Subjects
Physics, Particle physics, Antiparticle, Muon, Meson, Neutral current, High Energy Physics::Phenomenology, General Physics and Astronomy, Nuclear physics, Pseudoscalar, High Energy Physics::Experiment, Vector meson, Charm (quantum number), Lepton
Abstract

We report results of a search for flavor-changing neutral current (FCNC), lepton flavor, and lepton-number violating decays of the ${D}^{0}$ (and its antiparticle) into three and four bodies. Using data from Fermilab charm hadroproduction experiment E791, we examine modes with two leptons (muons or electrons) and a ${\ensuremath{\rho}}^{0}$, ${\overline{K}}^{*0}$, or $\ensuremath{\varphi}$ vector meson or a nonresonant $\ensuremath{\pi}\ensuremath{\pi}$, $K\ensuremath{\pi}$, or $\mathrm{KK}$ pair of pseudoscalar mesons. No evidence for any of these decays is found. Therefore, we present branching-fraction upper limits at 90% confidence level for the 27 decay modes examined (18 new).

Published
2001
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2. Study of theDs+→π−π+π+Decay and Measurement off0Masses and Widths

Author

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

Subjects
Physics, Crystallography, Particle physics, Pi, General Physics and Astronomy, Dalitz plot
Abstract

From a sample of $848\ifmmode\pm\else\textpm\fi{}44$ ${D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}$ decays, we find $\ensuremath{\Gamma}({D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+})/\ensuremath{\Gamma}({D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\varphi}{\ensuremath{\pi}}^{+})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.245\ifmmode\pm\else\textpm\fi{}{0.028}_{\ensuremath{-}0.012}^{+0.019}$. Using a Dalitz plot analysis of this three body decay, we find significant contributions from the channels ${\ensuremath{\rho}}^{0}(770){\ensuremath{\pi}}^{+}$, ${\ensuremath{\rho}}^{0}(1450){\ensuremath{\pi}}^{+}$, ${f}_{0}(980){\ensuremath{\pi}}^{+}$, ${f}_{2}(1270){\ensuremath{\pi}}^{+}$, and ${f}_{0}(1370){\ensuremath{\pi}}^{+}$. We also present the values obtained for masses and widths of the resonances ${f}_{0}(980)$ and ${f}_{0}(1370)$.

Published
2001
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3. Experimental Evidence for a Light and Broad Scalar Resonance inD+→π−π+π+Decay

Author

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

Subjects
Physics, Nuclear magnetic resonance, Amplitude, Scalar (mathematics), Analytical chemistry, Pi, General Physics and Astronomy, Dalitz plot, Resonance
Abstract

From a sample of 1172 +/- 61 D(+)-->pi(-)pi(+)pi(+) decays, we find gamma(D(+)-->pi(-)pi(+)pi(+))/gamma(D(+)-->K-pi(+)pi(+)) = 0.0311 +/- 0.0018(+0.0016)(-0.0026). Using a coherent amplitude analysis to fit the Dalitz plot of these decays, we find strong evidence that a scalar resonance of mass 478(+24)(-23) +/- 17 MeV/c(2) and width 324(+42)(-40) +/- 21 MeV/c(2) accounts for approximately half of all decays.

Published
2001
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4. Search for the Pentaquark via thePcs¯0→φπpDecay

Author

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

Subjects
Physics, Particle decay, Particle physics, Pion, Meson, Branching fraction, High Energy Physics::Phenomenology, Hadron, General Physics and Astronomy, High Energy Physics::Experiment, Energy (signal processing), Pentaquark, Bar (unit)
Abstract

We report results of the first search for the pentaquark P_{{c bar}s} which is predicted to be a doublet of states: P^0_{{c bar}s}=({c bar} s u u d) and P^-_{{c bar}s}=({c bar} s d d u). A search was made for the decay P^0_{{c bar}s} --> phi,pi,p in data from Fermilab experiment E791, in which 500 GeV/c pi^- beam interacted with nuclear targets. We present upper limits at 90% confidence level for the ratio of cross section times branching fraction of this decay to that for the decay D_s --> phi,pi. The upper limits are 0.031 and 0.063 for M(P^0_{{c bar}s}) = 2.75 and 2.86 GeV/c^2, respectively, assuming a P^0_{{c bar}s} lifetime of 0.4 ps.

Published
1998
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5. Measurement of the Form-Factor Ratios forD+→K¯*0e+νe

Author

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

Subjects
Physics, Particle physics, General Physics and Astronomy, Electron neutrino
Abstract

We present a measurement of the form-factor ratios r_V=V(0)/A_1(0) and r_2=A_2(0)/A_1(0) for the decay D^+ -> \overline K^{*0} e^+ \nu_e. The measurement is based on a signal of approximately 3000 $D^+ -> \overline K^{*0} e^+ \nu_e, \overline K^{*0} -> K^-\pi^+$ decays reconstructed in data from charm hadroproduction experiment E791 at Fermilab. The results are r_V = 1.84 +- 0.11 +- 0.08 and r_2 = 0.71 +- 0.08 +- 0.09.

Published
1998
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6. Search forD0−D0mixing and doubly-Cabibbo-suppressed decays of theD0in hadronic final states

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Pion, Hadron, Charge (physics), Sensitivity (control systems), Mixing (physics)
Abstract

We present results of a search for ${D}^{0}\ensuremath{-}{D}^{0}$ mixing and doubly-Cabibbo-suppressed decays of the ${D}^{0}$ in Fermilab experiment E791, a fixed-target charm hadroproduction experiment. We look for evidence of mixing in the decay chain ${D}^{*}\ensuremath{\rightarrow}\ensuremath{\pi}\stackrel{\ensuremath{\rightarrow}}{D}\ensuremath{\pi}(K\ensuremath{\pi}$ or $K\ensuremath{\pi}\ensuremath{\pi}\ensuremath{\pi})$. If the charge of the pion from the ${D}^{*}$ decay is the same as the charge of the kaon from the $D$ decay (a ``wrong-sign'' event), mixing may have occurred. Mixing can be distinguished from other sources of wrong-sign events (such as doubly-Cabibbo-suppressed decays) by analyzing the distribution of decay times. We see no evidence of mixing. Allowing for $\mathrm{CP}$ violation in the interference between DCS and mixing amplitudes our fitted ratio for mixed to unmixed decay rates is ${r}_{\mathrm{mix}}{=(0.39}_{\ensuremath{-}0.32}^{+0.36}\ifmmode\pm\else\textpm\fi{}0.16)%$. This corresponds to a 90% C.L. upper limit of ${r}_{\mathrm{mix}}l0.85%$. The sensitivity of this result is comparable to that of previous measurements, but the assumptions made in fitting the data are notably more general. We present results from many fits to our data under various assumptions. If we assume ${r}_{\mathrm{mix}}=0$, we find a two-sigma wrong-sign enhancement in the $K\ensuremath{\pi}$ mode which we ascribe to doubly Cabibbo-suppressed decays. The ratios of doubly Cabibbo-suppressed decays to Cabibbo-favored decays are ${r}_{\mathrm{dcs}}(K\ensuremath{\pi}{)=(0.68}_{\ensuremath{-}0.33}^{+0.34}\ifmmode\pm\else\textpm\fi{}0.07)%$ and ${r}_{\mathrm{dcs}}(K\ensuremath{\pi}\ensuremath{\pi}\ensuremath{\pi}{)=(0.25}_{\ensuremath{-}0.34}^{+0.36}\ifmmode\pm\else\textpm\fi{}0.03)%$.

Published
1998
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7. Search forD0D¯0Mixing in Semileptonic Decay Modes

Author

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

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

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

Published
1996
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8. Search for the Flavor-Changing Neutral-Current DecaysD+→π+μ+μ−andD+→π+e+e−

Author

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

Subjects
Physics, Particle physics, Flavor-changing neutral current, Pi, Mass spectrum, General Physics and Astronomy, Micro/Micro
Published
1996
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9. Upper limits onD±andB±decays to two leptons plusπ±orK±

Author

T. Schalk, J. Dorfan, A. M. Boyarski, P. Voruganti, Jordan Nash, S. Weisz, E. Soderstrom, A. Seiden, Kenneth G. Hayes, James Alexander, D.P. Coupal, Stephen Robert Wagner, D. Herrup, J. S. Haggerty, D. L. Burke, G. Hanson, S.L. White, B. W. LeClaire, D. Karlen, K. C. Moffeit, A. Baden, Darien Wood, E. Wicklund, Fordham C, Paul Sheldon, M. S. Gold, Walter R. Innes, T. Schaad, D. Hutchinson, B. D. Milliken, H. O. Ogren, M. Petradza, R. A. Ong, D. E. Dorfan, Clemens A. Heusch, A. J.R. Weinstein, J. Ballam, P. Weber, Ryszard Stroynowski, D. Fujino, Carl W. Akerlof, G. Bonvicini, D. Nitz, D. Y. Wu, R. Van Kooten, Burton Richter, B. B. Brabson, I. Juricic, P. Rankin, J. G. Smith, L. Gladney, M. Jaffré, George Gidal, A. Green, J. Hylen, D. Blockus, M. P. Alvarez, F. Bulos, H. F.W. Sadrozinski, J. Boyer, G. J. Feldman, F. Calviño, R. Tschirhart, E. Fernandez, D. P. Stoker, K. K. Gan, H. Veltman, R. J. Cence, N. S. Lockyer, D. Amidei, J. A. J. Matthews, Gerson Goldhaber, B. C. Barish, H. Schellman, W. Kozanecki, R. Harr, J. A. Kadyk, Cords D, F. Butler, A. S. Schwarz, Michael Levi, DeStaebler Hc, T. Glanzman, J. Kent, A. Breakstone, W. B. Schmidke, G. S. Abrams, G. H. Trilling, John Yelton, K. O'Shaughnessy, R. J. Hollebeek, Mark E. Nelson, A. Petersen, C.M. Hawkes, R. Frey, C. W. Peck, S. R. Klein, R. C. Field, D. R. Rust, R. R. Larsen, P. C. Rowson, Adolphsen Ce, L. Müller, J. W. Chapman, W. T. Ford, F. A. Harris, Sherwood Parker, Grosse-Wiesmann P, A. J. Weir, W. Koska, K. Riles, Timothy Barklow, Alan Litke, A. J. Lankford, John E. Bartelt, Patricia R. Burchat, J. A. Jaros, V. Luth, A. Snyder, Persis S. Drell, T. Himel, R. P. Thun, B. A. Barnett, D. I. Meyer, Frank C. Porter, and Jean-Marie Brom

Subjects
Nuclear physics, Semileptonic decay, Physics, Particle decay, Particle physics, Pion, Meson, Branching fraction, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Leptoquark, B meson, Lepton
Abstract

Data taken by the Mark II detector at the SLAC {ital e}{sup +}{ital e}{sup {minus}} storage ring PEP was used to search for exclusive decays of {ital D}{sup {plus minus}} and {ital B}{sup {plus minus}} mesons into two charged leptons plus a charged pion or kaon. All possible charge and lepton combinations consistent with charge conservation were considered and no evidence for any signals was found. We obtain upper limits for the various branching ratios ranging from 2.5{times}10{sup {minus}3} to 9.2{times}10{sup {minus}3}, at a 90% confidence level. Some of these limits can be used to constrain leptoquark masses in various models.

Published
1990
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10. Publisher’s Note: Model-independent measurement ofS-waveK−π+systems usingD+→Kππdecays from Fermilab E791 [Phys. Rev. D 73, 032004 (2006)]

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Particle decay, S-wave, Pi, Fermilab
Published
2006
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11. Model-independent measurement ofS-waveK−π+systems usingD+→Kππdecays from Fermilab E791

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Particle decay, Pion, Meson, Partial wave analysis, Hadron, Dalitz plot, Production (computer science), Invariant mass
Abstract

A model-independent partial-wave analysis of the S-wave component of the K{pi} system from decays of D{sup +} mesons to the three-body K{sup -}{pi}{sup +}{pi}{sup +} final state is described. Data come from the Fermilab E791 experiment. Amplitude measurements are made independently for ranges of K{sup -}{pi}{sup +} invariant mass, and results are obtained below 825 MeV/c{sup 2}, where previous measurements exist only in two mass bins. This method of parametrizing a three-body decay amplitude represents a new approach to analyzing such decays. Though no model is required for the S-wave, a parametrization of the relatively well-known reference P- and D-waves, optimized to describe the data used, is required. In this paper, a Breit-Wigner model is adopted to describe the resonances in these waves. The observed phase variation for the S-, P-, and D-waves do not match existing measurements of I=(1/2) K{sup -}{pi}{sup +} scattering in the invariant mass range in which scattering is predominantly elastic. If the data are mostly I=(1/2), this observation indicates that the Watson theorem, which requires these phases to have the same dependence on invariant mass, may not apply to these decays without allowing for some interaction with the other pion. The production rate of K{supmore » -}{pi}{sup +} from these decays, if assumed to be predominantly I=(1/2), is also found to have a significant dependence on invariant mass in the region above 1.25 GeV/c{sup 2}. These measurements can provide a relatively model-free basis for future attempts to determine which strange scalar amplitudes contribute to the decays.« less

Published
2006
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12. Dalitz Plot Analysis of the DecayD+→K−π+π+and Indication of a Low-Mass ScalarKπResonance

Author

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

Subjects
Physics, Particle decay, Particle physics, Pion, Meson, Hadron, General Physics and Astronomy, Resonance, Dalitz plot, Elementary particle, Boson
Abstract

We study the Dalitz plot of the decay ${D}^{+}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}$ with a sample of 15090 events from Fermilab experiment E791. Modeling the decay amplitude as the coherent sum of known $K\ensuremath{\pi}$ resonances and a uniform nonresonant term, we do not obtain an acceptable fit. If we allow the mass and width of the ${K}_{0}^{*}(1430)$ to float, we obtain values consistent with those from PDG but the ${\ensuremath{\chi}}^{2}$ per degree of freedom of the fit is still unsatisfactory. A good fit is found when we allow for the presence of an additional scalar resonance, with mass $797\ifmmode\pm\else\textpm\fi{}19\ifmmode\pm\else\textpm\fi{}43\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/{\mathrm{c}}^{\mathrm{2}}$ and width $410\ifmmode\pm\else\textpm\fi{}43\ifmmode\pm\else\textpm\fi{}87\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/{\mathrm{c}}^{2}$. The mass and width of the ${K}_{0}^{*}(1430)$ become $1459\ifmmode\pm\else\textpm\fi{}7\ifmmode\pm\else\textpm\fi{}5\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/{\mathrm{c}}^{\mathrm{2}}$ and $175\ifmmode\pm\else\textpm\fi{}12\ifmmode\pm\else\textpm\fi{}12\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/{\mathrm{c}}^{\mathrm{2}}$, respectively. Our results provide new information on the scalar sector in hadron spectroscopy.

Published
2002
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13. Study of the decayD0→K−K−K+π+

Author

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

Subjects
Physics, Nuclear and High Energy Physics, chemistry, Vacuum state, Analytical chemistry, Pi, chemistry.chemical_element, Platinum, Carbon
Published
2001
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14. Determination ofαsfrom energy-energy correlations ine+e−annihilation at 29 GeV

Author

J. S. Haggerty, C. A. Heusch, R. Van Kooten, W. Koska, Darien Wood, B. A. Barnett, L. Golding, R. Tschirhart, Kenneth G. Hayes, A. J. Lankford, J. A. Kadyk, D.P. Coupal, Stephen Robert Wagner, S. L. White, Timothy Barklow, P. S. Drell, D. L. Burke, R. Harr, H. O. Ogren, J. A. Jaros, F. Calviño, A. S. Schwarz, Ryszard Stroynowski, M. Petradza, R. A. Ong, D. Fujino, G. Bonvicini, J. P. Alexander, M. L. Perl, I. Juricic, DeStaebler Hc, B. C. Barish, A. Green, R. R. Larsen, P. Rankin, Alan Litke, R. J. Hollebeek, G. S. Abrams, H. F.W. Sadrozinski, A. Snyder, J. M. Brom, J. W. Chapman, D. Karlen, W. B. Schmidke, T. Schalk, G. J. Feldman, R. Frey, D. Nitz, D. Y. Wu, D. Amidei, T. Schaad, R. P. Thun, D. Hutchinson, W. T. Ford, J. Hylen, Gerson Goldhaber, H. Schellman, M. Alvarez, L. Müller, E. Fernandez, B. B. Brabson, Adolphsen Ce, J. A. J. Matthews, W. Kozanecki, Mark E. Nelson, P. R. Burchat, J. Kent, Z. Li, B. D. Milliken, D. I. Meyer, Grosse-Wiesmann P, A. Petersen, E. Wicklund, K. K. Gan, P. C. Rowson, B. W. Leclaire, J. G. Smith, F. A. Harris, D. R. Rust, A. Koide, P. Weber, John E. Bartelt, D. Herrup, A. Seiden, F. Butler, K. Riles, D. P. Stoker, M. E. Levi, P. Voruganti, T. Glanzman, R. C. Field, K.C. Moffeit, Jordan Nash, J. Boyer, W. R. Innes, M. Hoenk, F. Bulos, F. C. Porter, J. Ballam, M. Jaffré, Burton Richter, C. De La Vaissiere, D. Blockus, V. Luth, S. Weisz, R. J. Cence, George Gidal, Larry D. Gladney, P. D. Sheldon, Carl W. Akerlof, Cords D, A. J. Weinstein, Sherwood Parker, G. Hanson, C. Matteuzzi, A. Baden, K. O'Shaughnessy, C. W. Peck, J. Dorfan, John Yelton, A. M. Boyarski, S. R. Klein, C. M. Hawkes, G. H. Trilling, E. Soderstrom, N. S. Lockyer, A. J. Weir, T. Himel, Fordham C, A. Breakstone, D. E. Dorfan, M. S. Gold, and H. Veltman

Subjects
Quantum chromodynamics, Coupling constant, Nuclear physics, Physics, Particle physics, Annihilation, Electron–positron annihilation, Quark model, Hadron, High Energy Physics::Experiment, Nuclear Experiment, Storage ring, Hadronization
Abstract

We have studied the energy-energy correlation in e+e- annihilation into hadrons at s =29 GeV using the Mark II detector at the SLAC storage ring PEP. We find to O(s2) that s=0.1580.0030.008 if hadronization is described by string fragmentation. Independent fragmentation schemes give s=0.100.14, and give poor agreement with the data. A leading-log shower fragmentation model is found to describe the data well. © 1988 The American Physical Society.

Published
1988
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15. Multihadronic events atEc.m.=29 GeV and predictions of QCD models fromEc.m.=29 GeV toEc.m.=93 GeV

Author

B. W. Leclaire, Cords D, John Yelton, Jordan Nash, C. A. Heusch, K. K. Gan, S. Weisz, L. Golding, K. O'Shaughnessy, W. Koska, C. W. Peck, T. Schalk, D. Herrup, E. Fernandez, A. J. Weir, R. J. Hollebeek, Kenneth G. Hayes, P. Voruganti, R. Harr, J. S. Haggerty, D. R. Rust, E. Soderstrom, R. C. Field, K.C. Moffeit, Sherwood Parker, E. Wicklund, Fordham C, Larry D. Gladney, A. Breakstone, R. Frey, C. De La Vaissiere, Darien Wood, B. A. Barnett, Adolphsen Ce, Timothy Barklow, Alan Litke, A. Koide, P. Weber, J. A. Jaros, A. J. Weinstein, John E. Bartelt, M. E. Levi, D.P. Coupal, J. W. Chapman, Stephen Robert Wagner, M. Petradza, R. A. Ong, C. M. Hawkes, A. Snyder, A. Petersen, J. A. J. Matthews, W. Kozanecki, H. O. Ogren, P. S. Drell, D. Amidei, T. Himel, R. R. Larsen, G. S. Abrams, B. B. Brabson, F. Bulos, Ryszard Stroynowski, D. Fujino, M. S. Gold, A. Green, W. T. Ford, A. Seiden, F. Butler, P. Rankin, N. S. Lockyer, DeStaebler Hc, A. S. Schwarz, G. Bonvicini, George Gidal, J. P. Alexander, Mark E. Nelson, F. Calviño, M. Jaffré, M. L. Perl, H. F.W. Sadrozinski, Gerson Goldhaber, I. Juricic, H. Schellman, H. Veltman, R. J. Cence, Z. Li, J. Boyer, Carl W. Akerlof, D. I. Meyer, B. D. Milliken, Grosse-Wiesmann P, F. A. Harris, T. Glanzman, R. Tschirhart, K. Riles, M. Hoenk, S. L. White, D. Nitz, D. Y. Wu, P. D. Sheldon, J. Ballam, J. Hylen, R. Van Kooten, P. R. Burchat, R. P. Thun, D. P. Stoker, A. J. Lankford, B. C. Barish, D. Karlen, J. Kent, Burton Richter, D. Blockus, J. Dorfan, A. M. Boyarski, S. R. Klein, L. Müller, G. J. Feldman, D. L. Burke, T. Schaad, M. Alvarez, W. R. Innes, F. C. Porter, J. A. Kadyk, W. B. Schmidke, G. Hanson, C. Matteuzzi, A. Baden, G. H. Trilling, J. M. Brom, D. Hutchinson, J. G. Smith, D. E. Dorfan, and P. C. Rowson

Subjects
Nuclear physics, Physics, Quantum chromodynamics, Particle physics, Annihilation, Electron–positron annihilation, Hadron, High Energy Physics::Experiment, Elementary particle, Parton, Rapidity, Hadronization
Abstract

Multihadronic e/sup +/e/sup -/ annihilation events at a center-of-mass energy of 29 GeV have been studied with both the original (PEP 5) Mark II and the upgraded Mark II detectors. Detector-corrected distributions from global shape analyses such as aplanarity, Q/sub 2/-Q/sub 1/, sphericity, thrust, minor value, oblateness, and jet masses, and inclusive charged-particle distributions including x, rapidity, p/sub perpendicular/, and particle flow are presented. These distributions are compared with predictions from various multihadron event models which use leading-logarithmic shower evolution or QCD matrix elements at the parton level and string or cluster fragmentation for hadronization. The new generation of parton-shower models gives, on the average, a better description of the data than the previous parton-shower models. The energy behavior of these models is compared to existing e/sup +/e/sup -/ data. The predictions of the models at a center-of-mass energy of 93 GeV, roughly the expected mass of the Z/sup 0/, are also presented.

Published
1988
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