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30 results on '"D. H. Stork"'

1. Performance of a uranium/tetramethylpentane calorimeter backed by an iron/scintillator calorimeter

Author

J. Gronberg, Stanislas Otwinowski, Q. H. Tan, P. Cennini, C. D. Buchanan, Filippo Ceradini, E. Torrente-Lujan, L. Casoli, Guy Maurin, T. A. Fuess, L. Naumann, Alfredo Placci, L. Dumps, Hedo F. J. Diez, D. Bloess, Pierluigi Zotto, Giorgi M. De, W.F. Schmidt, G. Busetto, Carlo Rubbia, C. Bacci, A. Bezaguet, K. Morgan, R. Munoz, H. Castilla-Valdez, S. Tether, Alain Givernaud, X. Wu, Emilio Petrolo, R. J. Apsimon, A. Gonidec, H. Teykal, M. Dellanegra, V. Vuillemin, Tejinder Virdee, Francesco Lacava, Anna Teresa Meneguzzo, De Guchte M. W. Van, Christopher Seez, T. Rodrigo, Dave Robinson, L. Pontecorvo, Claudia J. Stubenrauch, A. Ferrando, H. Evans, R. Martinelli, E. Radermacher, D. Schinzel, O. Ullaland, A. Caner, F. Cavanna, M. Mohammadi, W. Kienzle, I. Josa-Mutuberria, Jean Pierre Charles Revol, Stefano Veneziano, Mortari G. Piano, P. Nedelec, D. Marchand, D. Drijard, Anna Di Ciaccio, S. Centro, Manfred Krammer, Konstanty Sumorok, M. Lindgren, G. Walzel, J. M. Bodenes, R. Conte, R. Bonino, I. Wingerter-Seez, W. Seidl, G. Bauer, and D. H. Stork

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Muon, Calorimeter (particle physics), Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Hadron, chemistry.chemical_element, Electron, Uranium, 01 natural sciences, 7. Clean energy, Nuclear physics, Pion, chemistry, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Instrumentation, Noise (radio)
Abstract

We present results from the barrel depleted uranium/TMP calorimeter modules constructed by the UA1 Collaboration. Electromagnetic and hadronic energy resolutions have been measured using electron and pion beams with momenta in the range 7 to 70 GeV/c. Results on the energy linearity and the spatial uniformity of response are reported. The electromagnetic shower position resolution has been measured as a function of energy using a fine grained position detector placed at a depth of − 3.5small chi, Greek0. The noise arising both from the electronics chain and from the uranium radioactivity is compared with 70 GeV/c muon signals. The ratio of the electron to pion response has been measured both as a function of the energy and of the electric field. The high lateral and longitudinal granularity of the calorimeter and the presence of a position detector have been used to determine the electron pion separation as a function of energy.

Published
1991

2. Exclusive Production ofK+K−π+π−in Photon-Photon Collisions

Author

H. Aihara, M. Alston-Garnjost, J. C. Armitage, J. A. Bakken, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, H. -U. Bengtsson, D. L. Bintinger, B. J. Blumenfeld, G. J. Bobbink, A. D. Bross, C. D. Buchanan, A. Buijs, M. P. Cain, D. O. Caldwell, O. Chamberlain, C. -Y. Chien, A. R. Clark, A. Cordier, O. I. Dahl, C. T. Day, K. A. Derby, M. A. van Driel, P. H. Eberhard, A. M. Eisner, F. C. Erne, D. L. Fancher, H. Fujii, T. Fujii, B. Gabioud, J. W. Gary, W. Gorn, N. J. Hadley, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, U. P. Joshi, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, Winston Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G. J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X. -Q. Lu, G. R. Lynch, L. Madansky, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, K. Maruyama, G. E. Masek, J. A. J. Matthews, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Palmer, D. A. Park, D. E. Pellett, A. Pevsner, M. Pripstein, P. R. Robrish, M. T. Ronan, R. R. Ross, F. R. Rouse, R. R. Sauerwein, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, M. L. Stevenson, D. H. Stork, M. K. Sullivan, J. R. Thompson, H. K. Ticho, J. Timmer, N. Toge, R. van Tyen, B. van Uitert, G. J. VanDalen, R. F. van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C. S. Williams, H. Yamamoto, M. Yamauchi, S. J. Yellin, and W. -M. Zhang

Subjects
Physics, Nuclear physics, Pair production, Pion, Annihilation, Meson, Branching fraction, Hadron, Mass spectrum, General Physics and Astronomy, Particle identification
Abstract

We report a measurement of the reaction ..gamma gamma -->..K/sup +/K/sup -/..pi../sup +/..pi../sup -/ in both tagged and untagged events at PEP. The cross section rises with invariant ..gamma gamma.. mass to about 15 nb at 2 GeV and falls slowly at higher masses. We find clear evidence for the processes ..gamma gamma -->..phi..pi../sup +/..pi../sup -/ and ..gamma gamma -->..K/sup asterisk0/(892)K..pi... Upper limits (95% C.L.) of 1.5 and 5.7 nb in the mass range from 1.7 to 3.7 GeV are obtained for phirho/sup 0/ and K/sup asterisk0/K/sup asterisk0/ production, respectively.

Published
1985

3. K*0andKS0Meson Production ine+e−Annihilations at 29 GeV

Author

J. M. Hauptman, A. Barbaro-Galtieri, B. Gabioud, B. C. Shen, L. Madansky, W.A. Wenzel, J. E. Huth, J. Hylen, H. Yamamoto, W. Moses, C. S. Lindsey, Gilbert Shapiro, R. I. Koda, M. L. Stevenson, S. C. Loken, T. Kamae, G. J. VanDalen, K. A. Derby, W. M. Zhang, F. R. Rouse, Q. Chamberlain, A. Cordier, A. Pevsner, Hirotsugu Fujii, D. A. Park, R. R. Kofler, Peter Nemethy, Philippe Eberhard, G. R. Lynch, Toshitsugu Fujii, N. Toge, Marjorie Shapiro, Orin I. Dahl, R. F. van Daalen Wetters, C. Y. Chien, Nicholas John Hadley, M. T. Ronan, E. M. Wang, M. Yamauchi, Hiroaki Aihara, Werner Hofmann, B. A. Barnett, L. T. Kerth, J. W. Gary, K. K. Kwong, Margaret Alston-Garnjost, R. van Tyen, A. D. Bross, W. E. Slater, Mitchell Wayne, A. R. Clark, A. V. Barnes, D. L. Fancher, D. H. Stork, P. J. Oddone, R. R. Sauerwein, J. G. Layter, K. Maruyama, R. R. Ross, H. K. Ticho, R. J. Madaras, J. A. Bakken, W. Gorn, H. S. Kaye, Barry Blumenfeld, C. D. Buchanan, C. T. Day, P. R. Robrish, J. N. Marx, X. Q. Lu, D. R. Nygren, J. A. J. Matthews, M. Pripstein, S. O. Melnikoff, and R. W. Kenney

Subjects
Nuclear physics, Physics, Particle physics, Antiparticle, Annihilation, Pion, Meson, Antimatter, Electron–positron annihilation, Hadron, General Physics and Astronomy, Elementary particle
Abstract

The inclusive production cross sections and transverse momentum distributions of ${K}^{*0}$ and ${{K}_{S}}^{0}$ mesons in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation at a center-of-mass energy of 29 GeV have been measured by means of the time projection chamber detector in the PEP-4 experiment. The mean multiplicites are found to be 0.49 \ifmmode\pm\else\textpm\fi{} 0.04(stat.) \ifmmode\pm\else\textpm\fi{} 0.07(syst.) (${K}^{*0}+{\stackrel{-}{K}}^{*0}$) and 1.22 \ifmmode\pm\else\textpm\fi{} 0.03(stat.) \ifmmode\pm\else\textpm\fi{}0.15(syst.) (${K}^{0}+{\stackrel{-}{K}}^{0}$) per event.

Published
1984

4. Tests of models for quark and gluon fragmentation ine + e − annihilation at $$\sqrt s = 29 GeV$$

Author

R. I. Koda, J. A. J. Matthews, H. Yamamoto, R. R. Kofler, K. A. Derby, P. Nemethy, T. Kamae, H. K. Ticho, D. H. Stork, R. J. Madaras, W. Moses, H. Fujii, J. E. Huth, M. Yamauchi, F. R. Rouse, W. M. Zhang, H. S. Kaye, A. V. Barnes, Ronald R. Ross, R. F. van Daalen Wetters, C. Y. Chien, R. R. Sauerwein, P. R. Robrish, A. Cordier, Marjorie Shapiro, B. Gabioud, C. D. Buchanan, M. Pripstein, A. Pevsner, N. J. Hadley, C. S. Lindsey, L. Madansky, A. D. Bross, S. O. Melnikoff, L. T. Kerth, Orin I. Dahl, M. T. Ronan, Gilbert Shapiro, M. R. Wayne, C. T. Day, J. G. Layter, Robert W. Kenney, William A. Wenzel, B. C. Shen, G. Lynch, Angela Barbaro-Galtieri, G. J. van Dalen, B. J. Blumenfeld, P. J. Oddone, J. Hylen, Werner Hofmann, D. A. Park, W. Gorn, J. W. Gary, S. C. Loken, Margaret Alston-Garnjost, R. van Tyen, W. E. Slater, X. Q. Lu, B. A. Barnett, Philippe Eberhard, K. Maruyama, J. A. Bakken, A. R. Clark, H. U. Bengtsson, K. K. Kwong, D. R. Nygren, Owen Chamberlain, J. N. Marx, J. M. Hauptman, E. M. Wang, M. L. Stevenson, D. L. Fancher, N. Toge, and Hiroaki Aihara

Subjects
Quark, Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Lund string model, Elementary particle, Parton, Gluon, Nuclear physics, Pion, Quark–gluon plasma, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous)
Abstract

Three currently used fragmentation models are tested by studying the distribution of particles between jet axes in the 3-jet events ofe+e− annihilation, using data collected by the Time Projection Chamber at PEP. These three models — the Lund String model, the Webber Cluster model and an Independent Fragmentation model (IF) — each implement different Lorentz-frame structures for the fragmentation process of quarks and gluons into hadrons. The Lund model provides a good description of the data, while the IF model does not. The Webber model, which is untuned, does not describe the absolute particle densities between jets, but correctly predicts the ratios of those densities, which are less sensitive to the tuning.

Published
1985

5. Characteristics of Proton Production in Jets frome+e−Annihilation at 29 GeV

Author

X. Q. Lu, W. E. Slater, W.A. Wenzel, Gilbert Shapiro, W. Gorn, M. L. Stevenson, S. C. Loken, A. R. Clark, D. H. Badtke, J. G. Layter, Peter Nemethy, B. Gabioud, C. D. Buchanan, L. Madansky, A. Barbaro-Galtieri, G. R. Lynch, C. S. Lindsey, H. Iwasaki, Owen Chamberlain, H. J. Hilke, W. M. Zhang, R. I. Koda, H. Videau, P. S. Martin, R. R. Kofler, J. Chiba, J. A. Bakken, R. M. Majka, Philippe Eberhard, A. Cordier, S. O. Melnikoff, M. T. Ronan, K. K. Kwong, C. Y. Chien, C. T. Day, Marjorie Shapiro, Mitchell Wayne, Orin I. Dahl, D. R. Nygren, G. J. VanDalen, N. Toge, K. Maruyama, Werner Hofmann, P. J. Oddone, W. Moses, R. F. van Daalen Wetters, R. W. Kenney, Hirotsugu Fujii, D. A. Park, P. R. Robrish, J. A. J. Matthews, L. T. Kerth, J. M. Hauptman, R. R. Ross, R. J. Madaras, H. K. Ticho, H. Yamamoto, D. L. Fancher, Hiroaki Aihara, J. Hylen, K. A. Derby, J. W. Gary, B. A. Barnett, F. R. Rouse, M. Yamauchi, M. Pripstein, Toshitsugu Fujii, A. D. Bross, Margaret Alston-Garnjost, Nicholas John Hadley, R. van Tyen, J. E. Huth, B. C. Shen, J. N. Marx, Barry Blumenfeld, T. Kamae, A. V. Barnes, D. H. Stork, R. R. Sauerwein, and A. Pevsner

Subjects
Physics, Particle physics, Annihilation, Proton, Meson, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, Nuclear physics, Baryon, Pion, High Energy Physics::Experiment, Nuclear Experiment, Nucleon
Abstract

Proton production in e/sup +/e/sup -/ annihilation at 29 GeV has been studied with the time projection chamber. Measurements of the dependence of proton fractions on momentum, transverse momentum with respect to the jet axis, hadron multiplicity, and event sphericity are reported. Our results are consistent with the assumption that primary baryons and mesons have similar production spectra, and indicate that protons provide more direct probes of underlying fragmentation phenomena than do pions.

Published
1984

6. Measurement ofτbranching ratios

Author

H. Aihara, M. Alston-Garnjost, R. E. Avery, J. A. Bakken, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, D. A. Bauer, H.-U. Bengtsson, D. L. Bintinger, G. J. Bobbink, T. S. Bolognese, A. D. Bross, C. D. Buchanan, A. Buijs, D. O. Caldwell, C-Y. Chien, A. R. Clark, G. D. Cowan, D. A. Crane, O. I. Dahl, K. A. Derby, J. J. Eastman, T. K. Edberg, P. H. Eberhard, A. M. Eisner, R. Enomoto, F. C. Erné, T. Fujii, J. W. Gary, W. Gorn, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, Winston Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G. J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X-Q. Lu, G. R. Lynch, L. Madansky, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, G. E. Masek, L. G. Mathis, J. A. J. Matthews, S. J. Maxfield, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Park, S. K. Park, D. E. Pellett, A. Pevsner, M. Pripstein, M. T. Ronan, R. R. Ross, F. R. Rouse, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, J. S. Steinman, M. L. Stevenson, D. H. Stork, M. G. Strauss, M. K. Sullivan, T. Takahashi, J. R. Thompson, N. Toge, S. Toutounchi, R. van Tyen, B. van Uitert, G. J. VanDalen, R. F. van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C. S. Williams, Z. R. Wolf, H. Yamamoto, S. J. Yellin, C. Zeitlin, and W-M. Zhang

Subjects
Nuclear physics, Physics, Semileptonic decay, Particle decay, Particle physics, Muon, Pion, Meson, Branching fraction, Hadron, Lepton
Abstract

Using the data accumulated at LEP in 1989 and 1990 with the ALEPH detector, the inclusive and exclusive branching ratios of the τ lepton have been measured assuming lepton universality inZ0 decays. The inclusive branching fractions for the τ decay into one, three, and five charged particles have been determined to be (85.45±0.97)%, (14.35±0.48)%, and (0.10±0.05)%, respectively, in agreement with the world averages. New undetected decay modes are determined to have a branching fraction of less than 2.1% at 95% CL. The measured branching ratios for quasi-exclusive channels are slightly larger than, but consistent with the world averages, except for the modes τ→3 hadrons+v τ andτ→hadron+2π0v τ , which are significantly larger. These latter branching ratios have been found to be (9.5±0.7)% and (10.2±1.1)%, respectively. The sum of all the measured quasi-exclusive branching ratios is (100.4±1.8)%. A fully exclusive analysis of modes with neutral pions shows no evidence for new photonic decay modes with a branching fraction limit of 3.4% at 95% CL.

Published
1987

7. Measurement of theπ−form factor

Author

J. A. Poirier, C. A. Rey, A.S. Vodopianov, T.E. Toohig, I. Ioan, D. H. Stork, D.J. Drickey, J. C. Tompkins, E.N. Tsyganov, C. F. May, E. B. Dally, P. F. Shepard, A. A. Wehmann, R. J. Wojslaw, T.S. Nigmanov, J. M. Hauptman, and Arlene Lennox

Subjects
Nuclear physics, Physics, Particle physics, Pion, Meson, Charge radius, Scattering, Form factor (quantum field theory), High Energy Physics::Experiment, Fermilab, Electron, Event (particle physics)
Abstract

An experiment to measure the electromagnetic form factor of the negative $\ensuremath{\pi}$ meson has been carried out at Fermilab by elastically scattering 100-GeV/c pions from the atomic electrons in a liquid-hydrogen target. We find that the elastic differential scattering cross section is characterized by a root-mean-square pion charge radius of 0.56\ifmmode\pm\else\textpm\fi{}0.04 fm. This paper described our experimental design, measurement resolutions, event triggering logic, event reconstruction, experimental corrections, and form-factor results.

Published
1981

8. Angular distributions of channeled pions and protons up to 250 GeV/c

Author

T.S. Nigmanov, W.M. Gibson, B.L. Chrisman, Z. Guzik, C.R. Sun, A.S. Vodopianov, D. H. Stork, M.A. Hasan, A. Kanofsky, J. Kubic, A.B. Watson, I.J. Kim, R.A. Carrigan, G. O. Williams, R. Allen, T.E. Toohig, and E.N. Tsyganov

Subjects
Azimuth, Momentum, Physics, Crystal, Nuclear and High Energy Physics, Total internal reflection, Pion, Particle, Polar, Atomic physics, Beam (structure)
Abstract

Channeling phenomena are observed for positive particles of momentum up to 250 GeV/ c in a germanium crystal. The polar angular distributions of the channeled particles are compared with theoretical predictions based on a diffusion model. The results indicate that at high particle energy there may be additional mechanisms besides those operative at low energy leading to dechanneling of the particles. In spite of this, channeling effects are observed for particles incident at up to several times the critical angle, in contrast with the results from low energy channeling. Statistical equilibrium in the azimuthal angular distribution has also been observed at all measured beam momenta to about twice the calculated channeling critical angle. The breakdown of statistical equilibrium for the 2 cm crystal used occurs at an incident angle 2–3 times smaller than predicted theoretically.

Published
1982

9. Inclusive γ and π0 production cross sections and energy fractions ine + e − annihilation at 29 GeV

Author

J. A. Bakken, J. Hylen, Hirotsugu Fujii, D. A. Park, B. A. Barnett, R. R. Kofler, L. Madansky, R. I. Koda, R. J. Madaras, William A. Wenzel, J. W. Gary, Owen Chamberlain, S. C. Loken, M. Yamauchi, P. J. Oddone, Gilbert Shapiro, M. R. Wayne, A. R. Clark, H. Iwasaki, D. R. Nygren, J. N. Marx, H. S. Kaye, J. G. Layter, H. Yamamoto, K. A. Derby, A. Pevsner, X. Q. Lu, G. Lynch, K. K. Kwong, C. S. Lindsey, Philippe Eberhard, W. Gorn, Marjorie Shapiro, J. E. Huth, M. L. Stevenson, W. M. Zhang, H. Aihara, Margaret Alston-Garnjost, R. van Tyen, A. Cordier, J. M. Hauptman, B. C. Shen, B. Gabioud, P. Nemethy, D. L. Fancher, Orin I. Dahl, Barry Blumenfeld, C. D. Buchanan, A. D. Bross, Toshitsugu Fujii, Angela Barbaro-Galtieri, E. M. Wang, W. E. Slater, M. T. Ronan, M. Pripstein, N. Toge, D. H. Stork, L. T. Kerth, R. R. Sauerwein, K. Maruyama, Hans-Uno Bengtsson, A. V. Barnes, J. A. J. Matthews, R. F. van Daalen Wetters, W. Moses, H. K. Ticho, P. R. Robrish, G. J. Van Dalen, T. Kamae, C. Y. Chien, Werner Hofmann, Ronald R. Ross, J. Chiba, S. O. Melnikoff, F. R. Rouse, C. T. Day, Robert W. Kenney, H. Videau, and N. J. Hadley

Subjects
Physics, Particle physics, Antiparticle, Annihilation, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Nuclear physics, Massless particle, Pion, Antimatter, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Engineering (miscellaneous), Lepton
Abstract

Inclusive production cross sections for photons and π0's ine + e − annihilation at a center of mass energy of 29 GeV have been measured. The π0 production spectrum agrees with a corresponding measurement for π±. The ratio of the π0 inclusive rate to the average for π± is 0.92±0.14. The fractions of the total energy carried by photons and π0's are 0.244±0.016 and 0.217±0.033, respectively. The fraction of total energy carried by all stable hadrons, prompt leptons and photons is determined to be 0.938±0.045, leaving 0.062±0.045 for neutrinos.

Published
1985

10. Modulation of nuclear interactions using channeling at multi-hundred GeV energies

Author

Ick-Joh Kim, T.E. Toohig, C.R. Sun, A.S. Vodopianov, T.S. Nigmanov, A.B. Watson, R.A. Carrigan, E.N. Tsyganov, A. Kanofsky, J. Kubic, B.L. Chrisman, Z. Guzik, R. Allen, D. H. Stork, M.A. Hasan, and W.M. Gibson

Subjects
Physics, Nuclear and High Energy Physics, Energy loss, Scattering, Nuclear Theory, chemistry.chemical_element, Germanium, Nuclear physics, Pion, chemistry, Modulation, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Single crystal, Beam (structure)
Abstract

Channeling of protons and positive and negative pions has been observed in a single crystal of germanium at beam momenta of 35, 100 and 250 GeV/c. Both energy loss and scattering have been measured. The channeling effects agree with observations at lower energies suitably scaled to these high energies. The suppression of inelastic nuclear interactions has been directly observed by monitoring multiple-track events.

Published
1980

11. Charge conjugation invariance in η′ (958)→π+π−γ

Author

F.D. Rudnick, A. Ladage, D. H. Stork, A. Grigorian, D.I. Sober, D.J. Mellema, and H.K. Ticho

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Meson, media_common.quotation_subject, Hadron, Charge (physics), Asymmetry, Nuclear physics, Momentum, Particle decay, Pion, High Energy Physics::Experiment, Nuclear Experiment, media_common
Abstract

The charge asymmetry in the decay η′(958)→π+π−γ has been measured using η′ mesons produced in the reaction π−p→η′n at 2.1 GeV/c incident pion momentum. A value for the asymmetry of (−6.9±7.8%) was obtained, based on 295±31 events after background subtraction. This result is consistent with C invariance in this decay.

Published
1975

12. Experimental limit onι→γγand the interpretation of the iota as a glueball

Author

H. Aihara, M. Alston-Garnjost, R. E. Avery, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, D. A. Bauer, H.-U. Bengtsson, D. L. Bintinger, B. J. Blumenfeld, G. J. Bobbink, A. D. Bross, C. D. Buchanan, A. Buijs, M. P. Cain, D. O. Caldwell, O. Chamberlain, C.-Y. Chien, A. R. Clark, G. D. Cowan, D. A. Crane, O. I. Dahl, K. A. Derby, J. J. Eastman, P. H. Eberhard, A. M. Eisner, R. Enomoto, F. C. Erne, T. Fujii, B. Gabioud, J. W. Gary, W. Gorn, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, U. P. Joshi, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, Winston Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G. J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X-Q. Lu, G. R. Lynch, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, K. Maruyama, G. E. Masek, L. G. Mathis, J. A. J. Matthews, S. J. Maxfield, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Park, D. E. Pellett, M. Pripstein, M. T. Ronan, R. R. Ross, F. R. Rouse, R. R. Sauerwein, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, J. S. Steinman, M. L. Stevenson, D. H. Stork, M. G. Strauss, M. K. Sullivan, T. Takahashi, J. R. Thompson, N. Toge, R. van Tyen, B. van Uitert, G. J. VanDalen, R. F. van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C. S. Williams, Z. R. Wolf, H. Yamamoto, M. Yamauchi, S. J. Yellin, C. Zeitlin, and W.-M. Zhang

Subjects
Physics, Nuclear physics, Iota, Particle physics, Pion, Pair production, Meson, Glueball, Branching fraction, Hadron, General Physics and Astronomy, Spectral line
Abstract

By observing the reaction ..gamma gamma -->..K-italic/sub s-italic//sup 0/K/sup +-/..pi../sup minus-or-plus/, the TPC/Two-Gamma experiment at the SLAC e-italic/sup +/e/sup -/ storage ring PEP has obtained a 95%-confidence-level limit of GAMMA/sub iota//sub ..-->..//sub ..gamma..//sub ..gamma../B(iota..-->..KK-bar..pi..) ..//sub ..gamma..//sub ..gamma../ limit appears to conflict with previous assignments of an observed rho..gamma.. decay to iota and also with many analyses of eta-eta'-iota mixing. The contrast of this small ..gamma gamma.. width with the large rate for J-italic/psi..--> gamma..iota is evidence that the iota is a glueball with little admixture of q-italicq-bar states.

Published
1986

13. Direct Measurement of theπ−Form Factor

Author

Arlene Lennox, I. Ioan, D.J. Drickey, C. A. Rey, P. F. Shepard, A. S. Vodopianov, J. M. Hauptman, E. B. Dally, J. A. Poirier, T.S. Nigmanov, C. F. May, D. H. Stork, T.E. Toohig, E.N. Tsyganov, R. J. Wojslaw, A. A. Wehmann, and J. C. Tompkins

Subjects
Physics, Elastic scattering, Antiparticle, Particle physics, Meson, Hadron, Form factor (quantum field theory), General Physics and Astronomy, Elementary particle, Pion, Charge radius, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment
Abstract

We have measured the electromagnetic form factor of the charged pion by direct scattering of 100-GeV/c ${\ensuremath{\pi}}^{\ensuremath{-}}$ from stationary electrons in a liquid-hydrogen target at Fermilab. The deviations from the pointlike pion-scattering cross section may be characterized by a root-mean-square charge radius for the pion of ${〈{{\mathcal{r}}_{\ensuremath{\pi}}}^{2}〉}^{\frac{1}{2}}=0.56\ifmmode\pm\else\textpm\fi{}0.04$ F.

Published
1977

14. Study of Bose-Einstein correlations ine+e−annihilation at 29 GeV

Author

H. K. Ticho, L. T. Kerth, Em Wang, D. R. Nygren, G. R. Lynch, W. A. Wenzel, W. E. Slater, A. R. Clark, X. Q. Lu, M. Yamauchi, F. R. Rouse, L. Madansky, M. L. Stevenson, N. Toge, A. D. Bross, R. W. Kenney, J. Hylen, W. M. Zhang, D. L. Fancher, J. M. Hauptman, C. Y. Chien, R. I. Koda, M. Pripstein, S. C. Loken, K. Maruyama, R. R. Kofler, A. Cordier, M. Alston-Garnjost, C. S. Lindsey, M. D. Shapiro, R. F. van Daalen Wetters, Hirotsugu Fujii, O. Chamberlain, K. A. Derby, H. Yamamoto, M. R. Wayne, A. V. Barnes, R. R. Sauerwein, M. T. Ronan, R. van Tyen, A. Pevsner, B. A. Barnett, G. J. Vandalen, W. Gorn, S. O. Melnikoff, A. Barbaro-Galtieri, R. J. Madaras, J. N. Marx, K. K. Kwong, T. Fujii, B. J. Blumenfeld, J. G. Layter, W. Moses, H. S. Kaye, O. I. Dahl, Tuneyoshi Kamae, H. U. Bengtsson, Hiroaki Aihara, C. D. Buchanan, C. T. Day, J. E. Huth, W. Hofmann, R. R. Ross, P. J. Oddone, D. H. Stork, B. Gabioud, D. A. Park, G. Shapiro, J. A. Bakken, P. H. Eberhard, J. W. Gary, B. C. Shen, P. R. Robrish, N. J. Hadley, Peter Nemethy, and J. A J Matthews

Subjects
Physics, Particle physics, Time projection chamber, Annihilation, Meson, Hadron, Bose–Einstein correlations, Nuclear physics, symbols.namesake, Pion, Pair production, Bose–Einstein statistics, symbols, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Bose-Einstein correlations between like-sign pions have been investigated in e/sup +/e/sup -/ annihilation at ..sqrt..s = 29 GeV using the Time Projection Chamber detector at the SLAC e/sup +/e/sup -/ storage ring PEP. The production rate of like-sign pion pairs with small relative momentum is found to be increased by more than 50% over the rate expected for uncorrelated production of pions. From the correlation length, a typical source radius of 0.65 fm is derived. Data are consistent with a spherical shape of the pion source. No dependence of radius or correlation strength on the event multiplicity is observed.

Published
1985

15. Elastic-Scattering Measurement of the Negative-Pion Radius

Author

T.S. Nigmanov, A.S. Vodopianov, P. F. Shepard, T.E. Toohig, E.N. Tsyganov, E. B. Dally, P. D. Rapp, J. Kubic, J. C. Tompkins, Z. Guzik, J. M. Hauptman, A. Grigorian, A. A. Wehmann, James T. Volk, J. A. Poirier, A.B. Watson, C. A. Rey, V. D. Riabtsoy, Andrew Beretvas, and D. H. Stork

Subjects
Nuclear physics, Physics, Elastic scattering, Pion, Annihilation, Meson, Hadron, General Physics and Astronomy, High Energy Physics::Experiment, Elementary particle, Radius, Electron, Nuclear Experiment
Abstract

A new measurement of the elastic scattering of 250-GeV/c negative pions by electrons provides form-factor results from 0.0368

Published
1982

16. Evidence for theF*Meson

Author

J. M. Hauptman, K. A. Derby, W. Moses, H. Yamamoto, M. Yamauchi, P. R. Robrish, A. D. Bross, A. Pevsner, A. V. Barnes, D. H. Stork, F. R. Rouse, J. Chiba, R. R. Sauerwein, X. Q. Lu, J. E. Huth, Hiroaki Aihara, J. G. Layter, A. R. Clark, D. H. Badtke, J. A. Bakken, H. S. Kaye, B. A. Barnett, Marjorie Shapiro, M. T. Ronan, A. Barbaro-Galtieri, W. M. Zhang, T. Kamae, R. R. Kofler, K. K. Kwong, J. A. J. Matthews, B. Gabioud, Orin I. Dahl, M. E. Zeller, E. M. Wang, J. N. Marx, Barry Blumenfeld, Margaret Alston-Garnjost, H. Iwasaki, R. van Tyen, M. Pripstein, W. E. Slater, W.A. Wenzel, Gilbert Shapiro, B. C. Shen, J. Hylen, C. D. Buchanan, M. L. Stevenson, Owen Chamberlain, S. C. Loken, Mitchell Wayne, R. M. Majka, C. T. Day, G. J. VanDalen, R. F. van Daalen Wetters, D. R. Nygren, Hirotsugu Fujii, D. A. Park, L. T. Kerth, L. Madansky, R. I. Koda, P. S. Martin, Philippe Eberhard, Ryoji Enomoto, W. Gorn, K. Maruyama, P. J. Oddone, R. R. Ross, R. J. Madaras, H. K. Ticho, Nicholas John Hadley, N. Toge, Peter Nemethy, Toshitsugu Fujii, S. O. Melnikoff, D. L. Fancher, R. W. Kenney, G. R. Lynch, C. Y. Chien, Werner Hofmann, C. S. Lindsey, J. W. Gary, and A. Cordier

Subjects
Physics, Particle physics, Annihilation, Meson, Electron–positron annihilation, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, Particle identification, Nuclear physics, Pion, High Energy Physics::Experiment, Nuclear Experiment, Boson
Abstract

Evidence for a narrow state decaying into an F meson and a photon has been obtained in e/sup +/e/sup -/ annihilation events at 29 GeV c.m. energy. This state lies 139.5 +- 8.3(stat) +- 9.7(syst) MeV above the F-meson mass and is consistent with the expected F( meson. The F mesons are identified by a peak in the K/sup +/K/sup -/..pi../sup + -/ mass at 1.948 +- 0.028 +- 0.010 GeV.

Published
1984

17. ElectromagneticΞ*(1530)Mass Difference

Author

L.T. Smith, D. H. Stork, H.K. Ticho, W. E. Slater, P.E. Schlein, and G. M. Pjerrou

Subjects
Physics, Nuclear physics, Particle physics, Pion, General Physics and Astronomy
Published
1965

18. production in 7.3 GeV/c K+p interactions

Author

D.Joel Mellema, P.M. Dauber, P.A. Schreiner, C.-Y. Chien, D. H. Stork, W. E. Slater, and H.K. Ticho

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Pion, Angular distribution, Production (computer science), Neutron
Abstract

Reactions involving Λ and Σ 0 production are studied in 7.3 GeV/c K+p interactions. Cross sections and angular distributions are given.

Published
1967

19. A measurement of the form factors for the decay KLo → πμν

Author

D.J. Drickey, D. H. Stork, C. D. Buchanan, E. Seppi, L. Ettlinger, P.F. Shepard, P. Innocenti, F.D. Rudnick, L. Resvanis, C. Y. Chien, H.K. Ticho, B. Cox, E. Dally, and R. Zdanis

Subjects
Physics, Nuclear and High Energy Physics, Muon, Pion, Strong coupling, Form factor (quantum field theory), Neutrino, Atomic physics
Abstract

The decay process KLo → πμν has been studied in a wire chamber experiment using the three-degree KLo beam at SLAC. A sample of 26 500 Kμ3 events have been identified to obtain information on the form factors ƒ ± associated with the V-A hypothesis for this decay. Expressing the energy dependence of the form factors as ƒ ± = ƒ ± (0) (1 + λ ± q 2 m 2 ), where q 2 = (p K −p μ ) 2 , the experiment yields the value λ+ = 0.08 ± 0.01 and reveals a strong coupling between λ_ and ζ_(0) = ƒ_(0) ƒ + (0) .

Published
1970

20. The isotopic spin of the η-meson

Author

P.E. Schlein, H. K. Ticho, D. H. Stork, D. J. Prowse, and M. Taherzadeh

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, Particle model, Astronomy and Astrophysics, Elementary particle, Resonance (particle physics), Atomic and Molecular Physics, and Optics, Nuclear physics, Pion, Deuterium, Isospin, Neutron
Published
1964

21. Resonance in the (Ξπ) System at 1.53 GeV

Author

D. J. Prowse, H.K. Ticho, P.E. Schlein, D. H. Stork, G. M. Pjerrou, and W. E. Slater

Subjects
Nuclear physics, Physics, Particle physics, Pion, General Physics and Astronomy, Dalitz plot, Spin (physics), Resonance (particle physics)
Published
1962

22. Y0∗ (1520) mass, width and decay fractions

Author

E.I. Malamud, P.M. Dauber, D. H. Stork, W. E. Slater, and P.E. Schlein

Subjects
Momentum, Physics, Nuclear physics, Nuclear and High Energy Physics, Pion, Hyperon, Resonance, Atomic physics
Abstract

The decay fractions of the Y 0 ∗ (1520) have been measured using the reaction K − p → Y 0 ∗ (1520) π + π − at 2.0 GeV/ c incident momentum. They are K N : Σπ: Λππ = (52 ± 4):(37 ± 4):(11 ± 2) . The best values for the mass and width are 1518.0 ± 0.7 MeV and 16 ± 2 MeV.

Published
1967

23. Spin and parity of the K ππ system near 1.3 GeV

Author

W. E. Slater, T.G. Trippe, P.A. Schreiner, C.-Y. Chien, D.J. Mellema, P.M. Dauber, H.K. Ticho, P.E. Schlein, D. H. Stork, and E.I. Malamud

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Effective mass (solid-state physics), Pion, Meson, Quantum electrodynamics, Dalitz plot, Parity (physics), Elementary particle
Abstract

The Kππ Dalitz plots for the two reactions K + p→K♂π + p at 7.38 GeV/ c beam momentum in the effective mass interval 1.2 M Kππ ∗++ (1.13 M π + p J P = 1 + to the Kππ system, are supported by the observed correlations of the outgoing K and K ∗ with the incident K + .

Published
1968

24. Evidence for a broad scalar Kπ resonance near 1.1 GeV

Author

H.K. Ticho, J. Mellema, D. H. Stork, E.I. Malamud, W. E. Slater, P.E. Schlein, C.-Y. Chien, and T.G. Tripple

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Angular distribution, Pion, Meson, Scalar (mathematics), High Energy Physics::Experiment, Nuclear Experiment, Nucleon, Delta baryon
Abstract

A one-pion-exchange pole-extrapolation analysis of K + p→K πΔ ++ at 7.3 GeV/ c provides evidence for the existence of a broad scalar T = 1 2 K π resonance near 1.1GeV. The angular distribution in the Kπ center-of-mass is consistent with this result.

Published
1968

25. Parity of theY1*(1660) Resonance

Author

D. J. Prowse, P.E. Schlein, H.K. Ticho, M. Taher-Zadeh, W. E. Slater, and D. H. Stork

Subjects
Nuclear physics, Nuclear reaction, Physics, Pion, Deuterium, General Physics and Astronomy, Parity (physics)
Published
1963

26. Spin-Parity Determination of theΞπResonance (1. 530 GeV)

Author

G. M. Pjerrou, H.K. Ticho, P.E. Schlein, D. D. Carmony, W. E. Slater, and D. H. Stork

Subjects
Physics, Nuclear physics, Angular distribution, Pion, Meson, Angular correlation, Pi, General Physics and Astronomy, Parity (physics), Hydrogen bubble, Lambda
Abstract

The XI pi resonance at 1.530 Bev, which was produced by meson (K/sup -/) reactions in a hydrogen bubble chamber at 1.801.95 Bev/c, was investigated. A complete angular correlation study of the decay sequence XI /sup *o/ yields XI /sup -/ + pi /sup +/, XI /su p -/ yields LAMBDA + pi /sup -/ is reported. lt is concluded that the simplest spin-parity assignment of the resonance is (3/2)/sup +/. (C.E.S.)

Published
1963

27. Measurement of the Inclusive Branching Fractionτ−→ντπ−π0+NeutralMeson(s)

Author

H. Aihara, M. Alston-Garnjost, R. E. Avery, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, D. A. Bauer, H. -U. Bengtsson, D. L. Bintinger, G. J. Bobbink, T. S. Bolognese, A. D. Bross, C. D. Buchanan, A. Buijs, D. O. Caldwell, A. R. Clark, G. D. Cowan, D. A. Crane, O. I. Dahl, K. A. Derby, J. J. Eastman, P. H. Eberhard, T. K. Edberg, A. M. Eisner, R. Enomoto, F. C. Erné, T. Fujii, J. W. Gary, W. Gorn, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, Winston Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G. J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X. -Q. Lu, G. R. Lynch, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, G. E. Masek, L. G. Mathis, J. A. J. Matthews, S. J. Maxfield, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Park, S. K. Park, D. E. Pellett, M. Pripstein, M. T. Ronan, R. R. Ross, F. R. Rouse, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, J. S. Steinman, M. L. Stevenson, D. H. Stork, M. G. Strauss, M. K. Sullivan, T. Takahashi, J. R. Thompson, N. Toge, S. Toutounchi, R. van Tyen, B. van Uitert, G. J. VanDalen, R. F. van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C. S. Williams, Z. R. Wolf, H. Yamamoto, M. Yamauchi, S. J. Yellin, C. Zeitlin, and W. -M. Zhang

Subjects
Semileptonic decay, Nuclear physics, Physics, Particle decay, Particle physics, Pion, Meson, Branching fraction, Hadron, General Physics and Astronomy, Elementary particle, Lepton
Abstract

We measure an inclusive branching fraction of (13.9 +- 2.0/sub -2.2//sup +1.9/)% for the decay tau/sup -/..--> nu../sub tau/..pi../sup -/..pi../sup 0/+nh/sup 0/ (ngreater than or equal to1), where h/sup 0/ is a ..pi../sup 0/ or an eta. The data sample, obtained with the time-projection chamber detector facility at the SLAC e/sup +/e/sup -/ storage ring PEP, corresponds to an integrated luminosity of 72 pb/sup -1/ at 29-GeV center-of-mass energy. The measured branching fraction is somewhat greater than the theoretical prediction and, with errors taken into account, could resolve the present difference between the inclusive and the sum of the exclusive tau/sup +- / branching fractions into one charged prong.

Published
1986

28. Example of the Production of aπ−Meson by aK+Meson

Author

D. H. Stork, D. J. Prowse, J. H. Mulvey, and E. Helmy

Subjects
Physics, Particle physics, Proton, Meson, Nuclear Theory, General Physics and Astronomy, Kinetic energy, Electric charge, Nuclear physics, Pion, Yield (chemistry), Pi, High Energy Physics::Experiment, Nuclear Experiment, Event (particle physics)
Abstract

In 50 meters of 200 to 300 Mev K/sup +/-meson track followed in nuclear emulsioii. one interaction event was found from which a pion track emerges. The incoming K/sup +/ meson had a kinetic energy of 323 plus or minus 20 Mev. The K/sup +/ meson re-emerged with an energy of 30 Mev at 36 degrees. Thc pion track has a characteristic pi - ending, and the pion was emitted with 34 Mev at 96 degrees. ln addition a 40-Mev proton left the star at 81 degrees and there are three other short tracks. Although the kinematics admit an analysis in which no inelastic secondary process occurred among the primary reaction products. strong inelastic secondary processes are quite possible and must be considered. Change independence holds important implications for the pion yield change ratios and the early trend of negative excess seems rather striking. (auth)

Published
1958

29. Experimental evidence against a non-strongly interacting CP-even KL0 component

Author

E. Seppi, P.F. Shepard, L. Ettlinger, D.J. Drickey, C. D. Buchanan, P. G. Innocenti, B. Cox, E. Dally, F.D. Rudnick, C. Y. Chien, D. Berk, L. Resvanis, R. A. Zdanis, H.K. Ticho, D. H. Stork, and A. Grigorian

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Pion, Invariance principle, Component (thermodynamics), Absorption (chemistry), Atomic physics, Constant (mathematics), Beam (structure)
Abstract

We have measured the rate for K L 0 → π + π − as a function of the thickness of lead absorber placed in a K L 0 beam at SLAC. Measurements were made with 12″, 18″ and 24″ of lead. Our results, which are relatively constant, are in strong disagreement with models which ascribe this decay mode to an additional neutral kaon state which is CP even, does not interact strongly, but otherwise has properties similar to the K 2 0 state.

Published
1970

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