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34 results on '"R. W. Kenney"'

1. Inclusive D*+- production in photon-photon collisions

Author

G. Shapiro, L. G. Mathis, S. Yellin, J. J. Eastman, T. K. Edberg, S. K. Park, S. Khacheryan, S. Toutounchi, P. J. Oddone, R. W. Stephens, J. S. Steinman, W. Vernon, A. Bay, G. Zapalac, W. T. Lin, C. Zeitlin, Margaret Alston-Garnjost, D. A. Crane, B. C. Shen, G. Masek, R. R. Ross, K. H. Fairfield, H. P. Paar, A. Lu, Elliott D. Bloom, R. R. Kofler, Y. T. Oyang, S. B. Chun, R. J. Madaras, G. Lynch, M. L. Stevenson, D. H. Stork, J. Lys, J. G. Layter, D. A. Bauer, R. E. Avery, K. T. Knopfle, H. Marsiske, S. C. Loken, M. T. Roman, H. Yamamoto, J. M. Hauptman, E. M. Wang, Orin I. Dahl, P. H. Eberhard, E. S. Miller, G. Godfrey, D. R. Nygren, Werner Hofmann, N. A. Nicol, F. C. Erné, H. Y. Chao, F.L. Linde, M. Pripstein, Allan G Clark, George P Yost, A. Buijs, C. D. Buchanan, M. Daoudi, M. G. Strauss, R. Belcinski, H. H. Bingham, A. R. Barker, D. E. Pellett, D. J. Lambert, W. A. Wenzel, Y. X. Wang, M. K. Sullivan, Willem G. J. Langeveld, R. W. Kenney, A. M. Eisner, A. P.T. Palounek, J. C. Sens, D. O. Caldwell, and IHEF (IoP, FNWI)

Subjects
Physics, Quark, Nuclear and High Energy Physics, Particle physics, Photon, Meson, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Parton, Hadronization, Nuclear physics, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment
Abstract

The TPC/Two-Gamma Collaboration has measured the inclusive cross section for production of charmed D∗± mesons in photon-photon collisions. The reaction utilized was e+e-→e+e-D∗±X, with D∗±→DOπ+-, DO→K-+π ±, and either zero or one outgoing e± detected. The result, σ(e + e - → e + e - D ∗± X) = 74±26±19 pb , is in agreement with the quark parton mo del prediction for e+e- → e+e-c c , combined with a Lund model for the hadronization of the charmed quarks.

Published
1990

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. A Muon Detection System for the PEP4 Facility

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Muon, business.industry, Detector, Particle detector, Linear particle accelerator, Nuclear physics, Software, Nuclear Energy and Engineering, Measuring instrument, Electrical and Electronic Engineering, business, Computer hardware
Abstract

A large muon detection system has been constructed and is fully operational in the PEP 4 facility. It is more than 99.6% efficient. The system is rugged and reliable. It is possible to verify the integrity of all the chambers in a few minutes. Associated software for identifying muons has been written and is working.

Published
1983

5. Performance of a Drift Chamber System for the Time Projection Chamber Detector Facility at PEP

Author

B. A. Barnett, J. Mallet, A. Barbaro-Galtieri, M. E. Zeller, M. Urban, P. S. Martin, A. D. Bross, Mitchell Wayne, Ronald R. Ross, W-M. Zhang, L. Madansky, R. Majka, N. Toge, G. J. Van Dalen, R. I. Koda, H. Videau, M. Pripstein, J. G. Layter, J. M. Hauptman, R. J. Madaras, R. F. vanDaalen Wetters, K. Maruyama, C.Y. Chien, N. J. Hadley, B. Gabioud, A. V. Barnes, P. J. Oddone, D. R. Nygren, J. A. J. Matthews, M. T. Ronan, M. Yamauchi, P. R. Robrish, G. Shapiro, R. R. Kofler, R. van Tyen, Marjorie Shapiro, W. Moses, F. R. Rouse, B. C. Shen, Orin I. Dahl, W. Gorn, H. K. Ticho, P. Nemethy, S. O. Melnikoff, S. C. Loken, Hirotsugu Fujii, H. Iwasaki, Clark S. Lindsey, J. Chiba, D. A. Park, O. Chamberlain, William A. Wenzel, C. S. Lindsey, W. C. Carithers, L. T. Kerth, H-J. Hilke, Allan G Clark, C. D. Buchanan, J. Hylen, P. H. Eberhard, Hiroaki Aihara, G. Lynch, T. Kamae, J. A. Bakken, B. Heck, C. T. Day, P. Delpierre, T. Ftjii, M. L. Stevenson, X-Q. Lu, D. H. Stork, D. H. Badtke, A. Pevsner, R. W. Kenney, W. E. Slater, Barry Blumenfeld, K. A. Derby, J. W. Gary, J. E. Huth, M. Alston-Garnjost, D. L. Fancher, J. N. Marx, and K. K. Kwong

Subjects
Physics, Nuclear and High Energy Physics, Signal generator, Time projection chamber, Physics::Instrumentation and Detectors, business.industry, Detector, Cosmic ray, Tracking (particle physics), Particle detector, Nuclear physics, Momentum, Optics, Nuclear Energy and Engineering, Measuring instrument, Electrical and Electronic Engineering, business
Abstract

A svstem of two cylindrical drift chambers has been designed and constructed to trigger the Time Projection Chamber and to assist in tracking and momentum reconstruction. Performance of these chambers has been studied with data collected from cosmic rays and actual e+e-collisions during recent experimental runs.

Published
1983

6. Prompt muon production ine+e−annihilations at 29 GeV

Author

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

Subjects
Nuclear physics, Quark, Physics, Particle physics, Muon, Annihilation, Hadron, Bottom quark, Charm quark
Abstract

We have studied the production of prompt muons in hadronic events from ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ annihilation at a center-of-mass energy of 29 GeV with the PEP4-TPC (Time Projection Chamber) detector. The muon p and ${p}_{t}$ distributions are well described by a combination of bottom- and charm-quark decays, with fitted semimuonic branching fractions of (15.2\ifmmode\pm\else\textpm\fi{}1.9\ifmmode\pm\else\textpm\fi{}1.2)% and (6.9\ifmmode\pm\else\textpm\fi{}1.1\ifmmode\pm\else\textpm\fi{}1.1)%, respectively. The muon spectra imply hard fragmentation functions for both b and c quarks, with 〈z(b quark)〉=0.80\ifmmode\pm\else\textpm\fi{}0.05\ifmmode\pm\else\textpm\fi{}0.05 and 〈z(c quark)〉=0.60\ifmmode\pm\else\textpm\fi{}0.06\ifmmode\pm\else\textpm\fi{}0.04. We derive neutral-current axial-vector couplings of a(b quark)=-0.9\ifmmode\pm\else\textpm\fi{}1.1\ifmmode\pm\else\textpm\fi{}0.3 and a(c quark)=1.5\ifmmode\pm\else\textpm\fi{}1.5\ifmmode\pm\else\textpm\fi{}0.5 from the forward-backward asymmetries.

Published
1985

7. Study of baryon correlations ine+e−annihilation at 29 GeV

Author

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

Subjects
Baryon, Nuclear physics, Physics, Particle physics, Annihilation, Electron–positron annihilation, General Physics and Astronomy
Published
1986

8. ΛProduction ine+e−Annihilation at 29 GeV

Author

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

Subjects
Physics, Particle physics, Annihilation, Electron–positron annihilation, Hadron, General Physics and Astronomy, Lambda baryon, Lambda, Baryon, Pair production, Antimatter, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Nuclear Experiment
Abstract

The inclusive production cross section of ..lambda.., anti ..lambda.. in e/sup +/e/sup -/ annihilation at a c.m. energy of 29 GeV has been measured with the time-projection-chamber detector at PEP. The average lambda, anti lambda multiplicity has been measured to be 0.197 +/- 0.012 (stat.) +/- 0.017 (syst.). ..lambda..-anti..lambda.. pairs have been observed in jets for the first time, and the average number of ..lambda..-anti..lambda.. pairs per event has been measured to be 0.042 +/- 0.017 +/- 0.014. 8 references, 3 figures.

Published
1985

9. Tests of Models for Parton Fragmentation by Means of Three-Jet Events ine+e−Annihilation ats=29GeV

Author

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

Subjects
Quantum chromodynamics, Physics, Particle physics, Annihilation, Mathematical model, Quark model, Hadron, Lund string model, General Physics and Astronomy, Parton, Elementary particle, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The distribution of particles in three-jet events is compared with the predictions of three fragmentation models currently in use: the Lund string model, the Webber cluster model, and an independent fragmentation model. The Lund model and, to a certain extent, the Webber model provide reasonable descriptions of the data. The independent fragmentation model does not describe the distribution of particles at large angles with respect to the jet axes. The results provide evidence that the sources of hadrons are Lorentz boosted with respect to the overall c.m.

Published
1985

10. Performance of the hexagonal calorimeter at PEP-4

Author

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

Subjects
Physics, Jet (fluid), Calorimeter (particle physics), Physics::Instrumentation and Detectors, business.industry, Monte Carlo method, General Engineering, Solid angle, STRIPS, law.invention, Optics, law, Calibration, High Energy Physics::Experiment, business, Image resolution, Projective geometry
Abstract

A Geiger-mode electromagnetic shower calorimeter has been constructed for PEP-4. Six trapezoidal modules cover 75% of 4 π solid angle in a hexagonal array. Each module contains 40 sense wire planes between 0.25 radiation-length thick lead-laminates, and is divided electrically into submodules of 27 and 13 layers. Half-degree wide hodoscopic channels in projective geometry provide excellent spatial resolution. In each gap three stereo views using the sense wires as well as strips on both cathodes at ±60° to the wires provide good shower reconstruction capabilities in multi-track jet events. Calibration and data analysis procedures are outlined. The performance of the calorimeter in the measurement of Bhabha events and the reconstruction of π 0 's in jet events is in excellent agreement with Monte Carlo simulations. The π 0 mass resolution is MeV (rms).

Published
1983

11. Spatial Resolution of the PEP-4 Time Projection Chamber

Author

B. C. Shen, K. A. Derby, D. H. Badtke, R. W. Kenney, A. Pevsner, H. Iwasaki, F. R. Rouse, Barry Blumenfeld, O. I. Dahl, J. E. Huth, A. Barbaro-Galtieri, M. Alston-Garnjost, K. Maruyama, L. Madansky, J. Chiba, J. Hylen, B. A. Barnett, R. I. Koda, Hiroaki Aihara, R. van Tyen, R. R. Kofler, J. M. Hauptman, H. K. Ticho, B. Gabioud, P. S. Martin, T. Fujii, R. J. Madaras, W. A. Wenzel, C. S. Lindsey, S. O. Melnikoff, M. E. Zeller, M. L. Stevenson, X-Q. Lu, M. D. Shapiro, J. G. Layter, A. D. Bross, J. N. Marx, Mitchell Wayne, H. Videau, D. R. Nygren, W. Moses, R. F. vanDaalen Wetters, J. W. Gary, P. Delpierre, P. J. Oddone, N. J. Hadley, N. Toge, J. A. Bakken, M. Yamauchi, G. Shapiro, Ronald Madaras, P. Nemethy, A. V. Barnes, R. R. Ross, H. Hilke, M. Pripstein, J. A. J. Matthews, G. J. Van Dalen, G. R. Lynch, Allan G Clark, D. H. Stork, P. R. Robrish, D. L. Fancher, J. Mallet, D. A. Park, O. Chamberlain, R. Majka, S. C. Loken, W. C. Carithers, P. H. Eberhard, C.Y. Chien, K. K. Kwong, H. Fujii, W-M. Zhang, M. T. Ronan, T. Kamae, W. E. Slater, C. D. Buchanan, M. Urban, W. Gorn, B. Heck, C. T. Day, and L. T. Kerth

Subjects
Physics, Nuclear and High Energy Physics, Argon, Time projection chamber, Physics::Instrumentation and Detectors, business.industry, Resolution (electron density), chemistry.chemical_element, Particle detector, Cathode, Magnetic field, law.invention, Optics, Nuclear magnetic resonance, Nuclear Energy and Engineering, chemistry, Physics::Plasma Physics, law, Measuring instrument, Electrical and Electronic Engineering, business, Image resolution
Abstract

The spatial resolution and response of the segmented cathode pads of the PEP-4 TPC have been measured with data taken at 8.5 atmospheres of 80% Argon-20% Methane gas with a 4kG magnetic field. The dependence of the spatial resolution and pad response on drift distance and track-anode crossing angle is presented.

Published
1983

12. 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

13. 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

14. Baryon Production ine+e−Annihilation ats=29GeV: Clusters or Diquarks?

Author

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

Subjects
Physics, Particle physics, Annihilation, Meson, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Quark model, General Physics and Astronomy, Elementary particle, Nuclear physics, Baryon, Diquark, Pair production, High Energy Physics::Experiment, Nuclear Experiment
Abstract

We use the time-projection chamber detector to study mechanisms of baryon production in the central rapidity region of jets from e/sup +/e/sup -/ annihilation. On the basis of angular correlations between protons and antiprotons, we exclude the isotropic decay of heavy mesonic clusters as a dominant source of baryons at 95% confidence level. The diquark mechanisms used in string fragmentation models reproduce the data, provided that diquarks are formed in a two-step process which allows mesons to be produced in between the baryon and antibaryon.

Published
1985

15. Observation of scaling of the photon structure functionF2γat lowQ2

Author

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

Subjects
Physics, General Physics and Astronomy, Atomic physics, Scaling, Photon structure function
Published
1987

16. Evidence for a Spin-1 Particle Produced by Two Photons

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, S. J. Yellin, C. Zeitlin, W. -M. Zhang, and IHEF (IoP, FNWI)

Subjects
Physics, Particle physics, Photon, Meson, General Physics and Astronomy, Resonance, Particle, High Energy Physics::Experiment, Production (computer science), Storage ring, Spin-½
Abstract

Two-photon production of ${K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}$ states has been studied by the TPC/Two-Gamma experiment at the SLAC storage ring PEP. A resonance of mass 1.42 GeV was seen when one of the photons was quite virtual but not when both photons were nearly real. Production of a spin-1 meson, which cannot be made by two real photons, would fit these observations. The ${Q}^{2}$ dependence of the data in the resonance region agrees with this spin assignment and is incompatible with a spin-0 hypothesis. The mass and width of the resonance are similar to those of the $E$ meson, which has been assigned ${J}^{P}={0}^{\ensuremath{-}}$ and ${J}^{P}={1}^{+}$ by different experiments.

Published
1986

17. Experimental limit on the decayτ−→ντK−K0

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, S. J. Yellin, C. Zeitlin, and W. -M. Zhang

Subjects
Physics, Particle physics, Tau neutrino, Electron–positron annihilation, General Physics and Astronomy, Limit (mathematics)
Published
1987

18. Charged-Hadron Inclusive Cross Sections and Fractions ine+e−Annihilation ats=29GeV

Author

A.R. Barker, D. R. Nygren, H. Yamamoto, J. G. Layter, G. E. Masek, J. M. Hauptman, S. J. Yellin, W. Moses, F. C. Erné, A. M. Eisner, F. R. Rouse, J. C. Sens, Z. R. Wolf, W. Vernon, M. Pripstein, S. Khacheryan, D. O. Caldwell, S. J. Maxfield, M. K. Sullivan, D. H. Stork, W. G.J. Langeveld, G. Cowan, J. R. Smith, Philippe Eberhard, R. R. Kofler, R. W. Kenney, B. C. Shen, A. Barbaro-Galtieri, Orin I. Dahl, D.A. Bauer, A. Lu, S. Toutounchi, Wolfgang Wagner, D. A. Crane, S. K. Park, J. Hylen, J. A. J. Matthews, T. K. Edberg, D. E. Pellett, F.L. Linde, B. D. Magnuson, A. R. Clark, G. J. Bobbink, H. P. Paar, J. S. Steinman, C. D. Buchanan, G. R. Lynch, H. Y. Chao, W.A. Wenzel, M. G. Strauss, T. Kamae, S. C. Loken, Gilbert Shapiro, Werner Hofmann, K. A. Derby, A. Bay, Y. X. Wang, Tadayuki Takahashi, M. L. Stevenson, P. J. Oddone, E. M. Wang, R. R. Ross, R. J. Madaras, Margaret Alston-Garnjost, R. van Tyen, H. S. Kaye, M. T. Ronan, K. H. Fairfield, H. Aihara, Ryoji Enomoto, E. S. Miller, K. A. Schwitkis, A. Buijs, R.E. Avery, J. J. Eastman, M. Daoudi, B. A. Barnett, L. Mathis, W. T. Lin, S. B. Chun, C. Zeitlin, and R. W. Stephens

Subjects
Nuclear physics, Physics, Particle physics, Annihilation, Hadron, General Physics and Astronomy
Published
1988

19. Measurement of Ionization Loss in the Relativistic Rise Region with the Time Projection Chamber

Author

L. Madansky, W. E. Slater, W. Gorn, C.Y. Chien, J. A. Bakken, B. Gabioud, M. T. Ronan, A. V. Barnes, J. M. Hauptman, J. A. J. Matthews, R. I. Koda, M. Urban, H. Hilke, C. D. Buchanan, K. K. Kwong, R. van Tyen, J. G. Layter, B. A. Barnett, W-M. Zhang, P. R. Robrish, S. C. Loken, W. C. Carithers, R. F. vanDaalen Wetters, J. Mallet, M. Yamauchi, P. S. Martin, Hiroaki Aihara, H. Fujii, P. H. Eberhard, K. A. Derby, K. Maruyama, T. Fujii, R. R. Kofler, T. Kamae, A. D. Bross, G. Shapiro, Ronald Madaras, M. L. Stevenson, M. D. Shapiro, Bernard Gabioud, G. R. Lynch, X-Q. Lu, B. Heck, J. E. Huth, J. Chiba, D. A. Park, O. Chamberlain, N. Toge, C. T. Day, M. Alston-Garnjost, H. K. Ticho, D. L. Fancher, R. R. Ross, J. W. Gary, F. R. Rouse, W. Moses, M. Pripstein, J. N. Marx, D. H. Stork, S. O. Melnikoff, P. J. Oddone, D. R. Nygren, J. Hylen, P. Nemethy, L. T. Kerth, R. Majka, H. Iwasaki, A. Pevsner, Barry Blumenfeld, H. Videau, N. J. Hadley, G. J. Van Dalen, A. Barbaro-Galtieri, O. I. Dahl, M. E. Zeller, A. R. Clark, Mitchell Wayne, D. H. Badtke, R. W. Kenney, W. A. Wenzel, C. S. Lindsey, P. Delpierre, and B. C. Shen

Subjects
Physics, Nuclear and High Energy Physics, Time projection chamber, Astrophysics::High Energy Astrophysical Phenomena, Resolution (electron density), Cosmic ray, Particle identification, Standard deviation, Cathode, law.invention, Nuclear physics, Nuclear Energy and Engineering, law, Ionization, Calibration, High Energy Physics::Experiment, Electrical and Electronic Engineering
Abstract

We present here some results obtained with the LBL Time Projection Chamber (TPC) regarding the particle identification by the measurement of the ionization losses in the relativistic rise region. This includes the method of calibration using 55Fe sources, the measurement of the resolution using cosmic rays, which shows an equivalent K-? separation of 4.8 standard deviations at 3.5 GeV/c, and the preliminary results obtained with multihadronic events from e+e- annihilations.

Published
1983

20. 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

21. Charged Hadron Production ine+e−Annihilation at 29 GeV

Author

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

Subjects
Nuclear physics, Baryon, Physics, Particle physics, Annihilation, Time projection chamber, Meson, Electron–positron annihilation, General Physics and Astronomy, High Energy Physics::Experiment, Charged particle, Particle identification, Hadronization
Abstract

Data from the Time Projection Chamber at the SLAC storage ring PEP have been used to study the inclusive production of charged hadrons. Particles were identified by simultaneous dE/dx and momentum measurements. Cross sections and particle fractions for pi +/-, k+/-, and p(anti-p) are given as a function of several variables. Predictions of various hadronization models are compared to the data. A comparison is made with other fragmentation processes.

Published
1984

22. Study ofη’formation in photon-photon collisions

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, S. J. Yellin, C. Zeitlin, and W-M. Zhang

Subjects
Physics, Nuclear physics, Particle physics, Photon, Prime (order theory)
Published
1987

23. 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

24. Search for Charge-43eParticles Produced ine+e−Annihilations

Author

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

Subjects
Nuclear physics, Physics, General Physics and Astronomy, Charge (physics)
Published
1984

25. Geiger Mode Calorimeter for PEP-4

Author

H. Aihara, M. Alston-Garnjost, D. H. Badtke, J. A. Bakken, A. Barbaro-Galtieri, A. V. Barnes, B. A. Barnett, B. Blumenfeld, A. Bross, C. D. Buchanan, W. C. Carithers, O. Chamberlain, J. Chiba, C-Y. Chien, A. R. Clark, O. I. Dahl, C. T. Day, P. Delpierre, K. A. Derby, P. H. Eberhard, D. L. Fancher, H. Fujii, T. Fujii, B. Gabioud, J. W. Gary, W. Gorn, N. J. Hadley, J. M. Hauptman, B. Heck, H. Hilke, J. E. Huth, J. Hylen, H. Iwasaki, T. Kamae, R. W. Kenney, L. T. Kerth, R. Koda, R. R. Kofler, K. K. Kwong, J. G. Layter, C.S Lindsey, S. C. Loken, X-Q. Lu, G. R. Lynch, L. Madansky, R. J. Madaras, R. Majka, J. Mallet, P. S. Martin, K. Maruyama, J. N. Marx, J. A. J. Matthews, S. O. Melnikoff, W. Moses, P. Nemethy, D. R. Nygren, P. J. Oddonel, D. Park, A. Pevsner, M. Pripstein, P. R. Robrish, M. T. Ronan, R. R. Ross, F. R. Rouse, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, M. L. Stevenson, D. H. Stork, H. K. Ticho, N. Toge, M. Urban, G. J. Van Dalen, R. van Tyen, H. Videau, M. Wayne, W. A. Wenzel, R. F. vanDaalen Wetters, M. Yamauchi, M. E. Zeller, and W-M. Zhang

Subjects
Physics, Nuclear and High Energy Physics, Photon, Calorimeter (particle physics), Physics::Instrumentation and Detectors, business.industry, STRIPS, Particle detector, Cathode, law.invention, Optics, Nuclear Energy and Engineering, law, Measuring instrument, Calibration, Geiger counter, Electrical and Electronic Engineering, business
Abstract

The PEP-4 hexagonal barrel calorimeter, with lead-laminate layers and 5×lOmm2 Geiger-mode discharge cells, has demonstrated excellent stability and uniformity in operation. The use of projective geometry in half degree-wide cathode strips at ±60 degrees to the sense wire channels provides excellent spatial resolution and reconstruction capability. The electronic noise-to-signal ratio without preamplification is sufficiently low that individual 50 pC Geiger discharges are accurately measured and used for energy calibration. Measurements made at 14.5 GeV e± beam energy have provided preliminary spectra of Bhabhas and of photon-photon invariant mass. The latter show that ?o's can be reconstructed.

Published
1983

26. Prompt electron production ine + e − annihilations at 29 GeV

Author

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

Subjects
Nuclear physics, Quark, Physics, Particle decay, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Neutral current, Branching fraction, Electron–positron annihilation, Elementary particle, Engineering (miscellaneous), Lepton
Abstract

We have measured the inclusive prompt electron cross section over a wide momentum range (P>0.5 GeV/c) with the PEP-4 TPC detector. The semielectronic branching fractions of thec andb quarks are (9.1±0.9 (stat.)±1.3 (syst.))% and (11.0±1.8±1.0)%, respectively. Theb quark fragmentation function peaks at highz with 〈zb〉=0.74±0.05±0.03. The axial couplings to the neutral current areac=2.3±1.4±1.0 for thec quark andab=−2.0±1.9±0.5 for theb quark.

Published
1985

27. Performance of the Signal Processing System for the Time Projection Chamber

Author

K. Maruyama, J. N. Marx, Stewart C. Loken, H. K. Ticho, M. E. Zeller, L. Madansky, W. Moses, A. D. Bross, M. D. Shapiro, R. I. Koda, M. Yamauchi, R. R. Ross, Mitchell Wayne, Allan G Clark, R. van Tyen, M. Pripstein, N. Toge, P. J. Oddone, H. Fujii, G. R. Lynch, J. A. Bakken, D. H. Stork, B. Heck, C. T. Day, F. R. Rouse, D. L. Fancher, B. A. Barnett, G. Shapiro, K. A. Derby, Hiroaki Aihara, W. Gorn, R. R. Kofler, H. Hilke, A. V. Barnes, L. T. Kerth, M. L. Stevenson, B. C. Shen, T. Fujii, M. T. Ronan, S. C. Loken, W. C. Carithers, X-Q. Lu, K. K. Kwong, P. S. Martin, J. A. J. Matthews, A. Pevsner, H. Videau, C. D. Buchanan, P. H. Eberhard, P. R. Robrish, J. W. Gary, Barry Blumenfeld, N. J. Hadley, D. A. Park, O. Chamberlain, J. Hylen, J. E. Huth, W. E. Slater, R. J. Madaras, G. J. Van Dalen, J. G. Layter, M. Urban, M. Alston-Garnjost, P. Nemethy, B. Gabioud, R. Majka, A. Barbaro-Galtieri, R. F. vanDaalen Wetters, C.Y. Chien, O. I. Dahl, D. R. Nygren, J. Mallet, J. M. Hauptman, H. Iwasaki, D. H. Badtke, R. W. Kenney, S. O. Melnikoff, J. Chiba, W-M. Zhang, T. Kamae, W. A. Wenzel, C. S. Lindsey, and P. Delpierre

Subjects
Nuclear and High Energy Physics, Engineering, Signal processing, Time projection chamber, business.industry, Detector, Electrical engineering, System testing, Optics, Nuclear Energy and Engineering, Ionization, Electronics, Electrical and Electronic Engineering, business, Image resolution
Abstract

The Time Projection Chamber has operated in the PEP colliding beams at SLAC since January 1982. Its signal processing system, containing 16020 channels, has been calibrated and monitored using a computer-controlled test pulser system. We describe the test system and review measurements made with the system of signal processing electronics.

Published
1983

28. Comparison of the Particle Flow inqq¯gandqq¯γEvents ine+e−Annihilation

Author

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

Subjects
Quark, Quantum chromodynamics, Physics, Particle physics, Annihilation, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Lattice, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, General Physics and Astronomy, Elementary particle, Jet (particle physics), Nuclear physics, Massless particle, High Energy Physics::Experiment, Event (particle physics)
Abstract

We compare the particle flow in the event plane of three-jet qq-barg (quark-antiquark-gluon) events with the particle flow in radiative annihilation events qq-bar..gamma.. (quark-antiquark-photon) for similar kinematic configurations. In the angular region between quark and antiquark jet, we find a significant decrease in particle density for qq-barg as compared to qq-bar..gamma... This effect is predicted in QCD as a result of destructive interference between soft-gluon radiation from quark, antiquark, and hard gluon.

Published
1986

29. φ- Meson Production ine+e−Annihilations at 29 GeV

Author

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

Subjects
Physics, Particle physics, Annihilation, Meson, Physics::Instrumentation and Detectors, Electron–positron annihilation, Hadron, General Physics and Astronomy, Elementary particle, Phi meson, Nuclear physics, Particle decay, High Energy Physics::Experiment, Boson
Abstract

Production of phi mesons in e/sup +/e/sup -/ annihilation at a center-of-mass energy of 29 GeV has been observed with the time-projection chamber detector at the PEP storage ring. The phi production rate has been measured in the energy range 0.075

Published
1984

30. 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

31. Search forQ=23eandQ=13eParticles Produced ine+e−Annihilations

Author

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

Subjects
Physics, Nuclear physics, Quark, Range (particle radiation), Particle physics, Annihilation, Time projection chamber, General Physics and Astronomy, Elementary particle, Particle identification
Abstract

In a search for heavy Q = (2/3)e and Q = (1/3)e particles produced in e/sup +/e/sup -/ collisions at a center-of-mass energy of 29 GeV, no candidate events were found in 77 pb/sup -1/ of data collected by the time projection chamber at PEP. Upper limits are established on the inclusive cross section for the production of Q = (2/3)e and Q = (1/3) particles in the mass range 1--13 GeV/c/sup 2/, improving upon previously established limits.

Published
1984

32. Observation of Strangeness Correlations ine+e−Annihilation ats=29GeV

Author

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

Subjects
Physics, Nuclear physics, Particle physics, Annihilation, General Physics and Astronomy, Strangeness
Published
1984

33. 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

34. Erratum: Tests of models for parton fragmentation by means of three-jet events ine+e−annihilation at √s¯=29 GeV [Phys. Rev. Lett. 54, 270 (1985)]

Author

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

Subjects
Nuclear physics, Physics, Annihilation, Fragmentation (mass spectrometry), General Physics and Astronomy, Parton
Published
1985

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