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21 results on '"G. E. Masek"'

1. Evidence for spin-one resonance production in the reaction γγ*→π+π−π0π0

Author

G. Godfrey, N. A. Nicol, J. M. Hauptman, R. W. Stephens, A. Lu, B. C. Shen, Y. X. Wang, S. Khacheryan, J. Y. Oyang, W. T. Lin, A. R. Clark, G. R. Lynch, S. J. Yellin, R. R. Ross, R. J. Madaras, C. D. Buchanan, D. J. Lambert, D. R. Nygren, Werner Hofmann, J. J. Eastman, A. P.T. Palounek, H. Yamamoto, David O. Caldwell, M. K. Sullivan, J. Lys, G. Zapalac, E. M. Wang, S. B. Chun, G. S. Greenbaum, R. L. Holtzapple, H. H. Bingham, K. T. Knöpfle, David E. Pellett, Michael A. Strauss, W. Vernon, R. C. Berg, C. Zeitlin, George P Yost, H. P. Paar, M. Daoudi, E. S. Miller, R. Belcinski, G. E. Masek, W.A. Wenzel, Gilbert Shapiro, M. L. Stevenson, M. T. Ronan, K. H. Fairfield, S. C. Loken, A. M. Eisner, D. A. Bauer, R. R. Kofler, Orin I. Dahl, and J. G. Layter

Subjects
Physics, Nuclear physics, Massless particle, Pion, Meson, Branching fraction, Isospin, Hadron, Elementary particle, Atomic physics, Boson
Abstract

Using data from the TPC/Two-Gamma experiment at the SLAC [ital e][sup +][ital e[minus]] storage ring PEP, a [ital C]=+1 resonance has been observed in the [pi][sup +][pi][sup [minus]][pi][sup 0][gamma] final state resulting from the fusion of one nearly real and one quite virtual photon. The actual decay channel is probably [pi][sup +][pi][sup [minus]][pi][sup 0][pi][sup 0], where one final-state photon is not detected, and the mass of the fully reconstructed state would be approximately 1525 MeV. A four-pion decay mode in turn implies that the resonance has even isospin. The nonobservation of this [ital R](1525) when both initial-state photons are nearly real suggests a spin-1 assignment. Since the large measured value of the product of the branching ratio into [pi][sup +][pi][sup [minus]][pi][sup 0][pi][sup 0] and the [gamma][gamma] coupling makes it unlikely that this state is the mostly [ital [bar s]s] [ital f][sub 1](1510), its interpretation may lie outside of conventional meson spectroscopy. There is a second, less-significant enhancement observed in the same reaction at a four-pion mass centered around 2020 MeV.

Published
1993
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2. Measurement of the kaon content of three-prong tau decays

Author

M. K. Sullivan, H. Yamamoto, S. J. Yellin, D. E. Pellett, Y. X. Wang, J. Lys, G. S. Greenbaum, R. L. Holtzapple, G. Zapalac, E. M. Wang, H. H. Bingham, George P Yost, S. C. Loken, S. Khacheryan, R. R. Ross, D. O. Caldwell, G. R. Lynch, A. Lu, D. R. Nygren, R. J. Madaras, G. Godfrey, W.A. Wenzel, Gilbert Shapiro, A. M. Eisner, M. L. Stevenson, K. T. Knöpfle, E. S. Miller, R. C. Berg, Werner Hofmann, J. M. Hauptman, R. R. Kofler, Philippe Eberhard, D. J. Lambert, H. P. Paar, Y. T. Oyang, Orin I. Dahl, M. T. Ronan, K. H. Fairfield, H. Marsiske, C. D. Buchanan, W. Vernon, N. A. Nicol, A. P.T. Palounek, R. Belcinski, M. G. Strauss, S. B. Chun, E.E. Bloom, A. R. Clark, D.A. Bauer, J. J. Eastman, G. E. Masek, and R. W. Stephens

Subjects
Combinatorics, Physics, Systematic error, Particle physics, Branching fraction, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, TheoryofComputation_GENERAL, MathematicsofComputing_DISCRETEMATHEMATICS
Abstract

We present branching fraction measurements of three-prong decays of the [tau][sup [minus]] lepton based on data from the TPC/Two-Gamma detector at SLAC PEP. The decays are classified according to the identities of the charged tracks to give simultaneous measurements of [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][pi][sup +][pi][sup [minus]]]=0.58[sub [minus]0.13][sup +0.15]% and [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][ital K][sup +][pi][sup [minus]]]=0.15[sub [minus]0.07][sup +0.09]%, and upper limits of [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]][pi][sup [minus]][ital K][sup +][pi][sup [minus]]][lt]0.25%, [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][pi][sup +][ital K][sup [minus]]][lt]0.09%, and [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][ital K][sup +][ital K][sup [minus]]][lt]0.21%, where additional neutrals may be present in each case. The branching fractions are normalized to the world average three-prong topological branching fraction and there is an estimated 20% systematic error in addition to the listed statistical errors. We find the mass distributions in the [ital K][sup [minus]][pi][sup +][pi][sup [minus]] decay are consistent with [ital K][sub 1] dominance, and obtain branching fractions of [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sub 1][sup [minus]](1270)]=0.41[sub [minus]0.35][sup +0.41]% and [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sub 1][sup [minus]](1400)]=0.76[sub [minus]0.33][sup +0.40]%.

Published
1994

3. Inclusiveγ-Ray Spectra fromψ(3095)andψ′(3684)Decays

Author

C. J. Biddick, T. H. Burnett, G. E. Masek, E. S. Miller, J. G. Smith, J. P. Stronski, M. K. Sullivan, W. Vernon, D. H. Badtke, B. A. Barnett, L. H. Jones, G. T. Zorn, M. Cavalli-Sforza, G. Goggi, F. S. Impellizzeri, M. M. Livan, F. H. Pastore, B. Rossini, D. G. Aschman, D. G. Coyne, D. E. Groom, G. K. O'Neill, H. F. W. Sadrozinski, K. A. Shinsky, L. P. Keller, D. E. Lyon, R. L. Ford, E. Hilger, R. Hofstadter, E. B. Hughes, T. W. Martin, L. H. O'Neill, and J. W. Simpson

Subjects
Physics, Meson, Branching fraction, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Hadron, Gamma ray, General Physics and Astronomy, Elementary particle, Spectral line, Nuclear physics, Radiative transfer, High Energy Physics::Experiment, Atomic physics
Abstract

Inclusive gamma-ray experiments were carried out in a e(+)e(-) colliding-beam apparatus with NaI(Tl) arrays as detectors. The inclusive gamma-ray spectra, after cosmic-ray background subtraction, are shown as histograms for the decays of the psi(3095) and psi-prime(3684). The psi spectrum has no significant narrow structure, while the psi-prime spectrum shows at least four peaks. Three major radiative decays of the psi-prime(3684) are found, and their respective branching fractions are computed.

Published
1977
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4. 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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5. 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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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. 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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8. 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
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9. 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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10. 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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11. 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
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12. Experimental limit onι→γγand the interpretation of the iota as a glueball

Author

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

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

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

Published
1986
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13. 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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14. Elastic Scattering of 1.2-BeV/cMuons from Hydrogen

Author

R. W. Williams, E. D. Platner, T. E. Ewart, G. E. Masek, J. P. Toutonghi, and H. F. Davis

Subjects
Momentum, Elastic scattering, Physics, Nuclear physics, Muon, Pion, Scattering, Physics::Accelerator Physics, General Physics and Astronomy, Bevatron, Electron, Atomic physics, Lambda
Abstract

The absolute cross section for the elastic scattering of negative muons from protons was measured over a range of momentum transfers of 450 to 850 MeV/c. The muon beam was formed by decay in flight of Bevatron produced pions and was separated from the pion beam electronically by using four gas-filled threshold \ifmmode \check{C}\else \v{C}\fi{}erenkov counters. A total of 3\ifmmode\times\else\texttimes\fi{}${10}^{8}$ muons were incident on two large liquid hydrogen targets in tandem and gave a total of 56\ifmmode\pm\else\textpm\fi{}9 acceptable scattering events, as compared to 48 predicted by the Rosenbluth formula for electromagnetic scattering from protons. A $\ensuremath{\chi}$-square analysis of the scattered events gave agreement at the 75% level for the angular distribution of the data and the theoretical predictions, and gave with 95% confidence ${\ensuremath{\Lambda}}^{\ensuremath{-}1}\ensuremath{\le}0.16$ F, where ${\ensuremath{\Lambda}}^{\ensuremath{-}1}$ is the conventional breakdown parameter. Hence, in this experiment, the behavior of muons scattered from protons at large momentum transfers is indistinguishable from that of electrons.

Published
1963
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15. Scattering of 2-Bev/cMuons in Carbon and Lead

Author

R. W. Williams, L. D. Heggie, G. E. Masek, and Y. B. Kim

Subjects
Nuclear physics, Physics, Particle physics, Muon, Pion, Cover (topology), Meson, Scattering, Momentum transfer, Form factor (quantum field theory), General Physics and Astronomy, Energy (signal processing)
Abstract

The scattering cross section of high-energy $\ensuremath{\mu}$ mesons in carbon and lead has been measured, using a pure, monoenergetic beam of muons obtained with the Bevatron at the Lawrence Radiation Laboratory. Preparation, purification, and measured properties of the beam are described. The median momentum was 2.00\ifmmode\pm\else\textpm\fi{}0.03 Bev/c, the spread in momentum was not more than \ifmmode\pm\else\textpm\fi{}3.5%, and the effective contamination due to pions was 4.9\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}6}$. During the experiment the total number of muons incident on the apparatus was 2.5\ifmmode\times\else\texttimes\fi{}${10}^{7}$. Counter hodoscopes recorded the muons scattered from 14.4 g/${\mathrm{cm}}^{2}$ of lead and from 27 g/${\mathrm{cm}}^{2}$ of carbon. Inelastic as well as elastic processes were accepted. Scattered particles were observed at angles up to 12\ifmmode^\circ\else\textdegree\fi{} (momentum transfer \ensuremath{\sim}400 Mev/c). The lead data cover the same range as those cosmic-ray experiments which have appeared to indicate an anomalously large scattering. No anomaly is found; the lead scattering agrees closely with the distribution calculated by Cooper and Rainwater for purely electromagnetic interactions. The carbon data permit a better comparison with theoretical expectations, since one is measuring the single-scattering cross section directly, and one can account for the effects of nuclear structure rather accurately, using electron-scattering data and a detailed theoretical analysis of Drell and Schwartz. The carbon scattering results, based on 300 events in the region 70 Mev/c-400 Mev/c momentum transfer, agree closely with the Drell-Schwartz theory. The upper limits which this result places on a nonelectromagnetic scattering cross section and on a muon form factor are discussed.

Published
1961
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16. Measurement of Electron Scattering in Carbon to Compare with a Muon Experiment

Author

R. W. Williams, D.H. Coward, J. P. Toutonghi, and G. E. Masek

Subjects
Physics, Muon, Scattering, Momentum transfer, General Physics and Astronomy, Scattering length, Electron, Inelastic scattering, Nuclear physics, Cross section (physics), Physics::Accelerator Physics, High Energy Physics::Experiment, Atomic physics, Electron scattering
Abstract

A measurement of the inelastic scattering of high-energy electrons in carbon has been carried out with the express purpose of obtaining an experimental cross section to compare with a recently-completed measurement of muon scattering. A scaling law which connects the electron result with the (higher-energy) muon result is described. Results for the summed (elastic plus all inelastic) cross section at two values of the muon scattering angle are presented. At the smaller angle (momentum transfer \ensuremath{\sim}200 Mev/c) agreement with the theoretical (Drell-Schwartz) sum rule is good; at the larger one (\ensuremath{\sim}280 Mev/c) it is poorer but within the experimental and theoretical uncertainties. Comparison with the muon results does not alter the previous conclusion: That no muon scattering anomaly is seen.

Published
1961
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19. Single Scattering of 2-Bev/cMuons in Nuclear Emulsions

Author

Y. B. Kim, G. E. Masek, C. Y. Kim, S. Kaneko, and R. W. Williams

Subjects
Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, Scattering, Momentum transfer, General Physics and Astronomy, Bevatron, Momentum, Nuclear physics, Pion, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear emulsion, Nuclear Experiment, Beam (structure)
Abstract

The single scattering of high-energy muons from emulsion nuclei was measured using a monoenergetic beam of muons produced at the Berkeley bevatron. The median momentum of muons was 2.00\ifmmode\pm\else\textpm\fi{}0.03 Bev/c with a spread of no more than \ifmmode\pm\else\textpm\fi{}3.5%. Nuclear emulsion stacks were exposed to this muon beam behind the targets used for a counter experiment. The results of the counter experiment were reported earlier. The muon tracks recorded in nuclear emulsions were followed by a special fast-scanning technique, and a total of 682 single scattering events were found from 743 meters of track following. For the muon beam accepted in the emulsion scanning, the pion contamination was measured to be 1.3\ifmmode\pm\else\textpm\fi{}0.2%. These pions contribute to the integral muon scattering data by about 3% for scattering angles greater than 1\ifmmode^\circ\else\textdegree\fi{}. The observed scattering distribution which extends up to 3\ifmmode^\circ\else\textdegree\fi{} scattering angle, or momentum transfer of about 100 Mev/c, is in good agreement with the electromagnetic theory predictions and complements the counter experiment which covered momentum transfers of 70-400 Mev/c.

Published
1961
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20. 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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21. Large Gas Čerenkov Counter

Author

R. J. Swanson and G. E. Masek

Subjects
Physics, Nuclear physics, Pion, Muon, Meson, Beta (plasma physics), Instrumentation, Cherenkov radiation
Abstract

A large gas Cerenkov counter used to discriminate between pions and muons of 2 Bev/c is described. The counter can resolve beta differences of the order of 0.0010. The rejection ratio of the system is approximately 0.004. The construction of the counter is similar to that of other gas counters and differs from them principally in its size and the Fresnel lens-focusing arrangement. (M.C.G.)

Published
1961
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