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2. 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
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3. 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
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4. 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
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5. 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
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6. 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
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7. 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
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8. 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
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9. 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
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10. 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
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11. 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
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12. 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
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13. 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
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14. Quark fragmentation functions and long-range correlations ine + e ? annihilation at 29 GeV

Author

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

Subjects
Quark, Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Particle model, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Elementary particle, Nuclear physics, Fragmentation (mass spectrometry), Transverse momentum, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), Interaction range
Abstract

We study long-range correlations between hadrons in opposite jets ine+e− annihilation events at\(\sqrt s \)=29 GeV. We use the data to measure differences between quark and antiquark fragmentation functions into charged hadrons, and to estimate the variation of fragmentation properties among quark flavors. We find large variations in longitudinal fragmentation functions, but universal mean transverse momenta of hadrons in jets.

Published
1985
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15. 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
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16. 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
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17. 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
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18. 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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