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Your search keyword '"G. E. Masek"' showing total 3 results
Start Over Author "G. E. Masek" Journal physical review d
3 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. 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. 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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