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8 results on '"H.O Cohn"'

1. Photoproduction of an isovector ρπ state at 1775 MeV

Author

H. Yuta, J. Shimony, I. A. Pless, T. Kitagaki, I. M. Godfrey, Y. Yoshimura, P. Dingus, R. N. Diamond, S. Tether, James Shank, M. Jobes, H.O. Cohn, E. L. Hart, Shlomo Dado, S. J. Sewell, R. C. Field, D. A. Waide, J. Ballam, J. E. Brau, C. Milstene, W. Cameron, S. Wolbers, W. D. Walker, D. C. Colley, R. K. Yamamoto, H. J. Hargis, K. Braune, A. T. Goshaw, C. G. Wilkins, E. McCrory, M. J. Harwin, V. R. O’Dell, K. Tamai, George P Yost, S. Noguchi, M. Widgoff, T. Handler, R. Armenteros, S. Tanaka, T. C. Bacon, A. M. Shapiro, T. Sato, K. C. Moffeit, A. Yamaguchi, D. P. Kelsey, S.L. White, K. Hasegawa, T. Glanzman, T. Kafka, S. W. O'Neale, J. J. Goldberg, A. Falicov, H. Sagawa, R. Merenyi, Aharon Levy, P. Rankin, K. Abe, G.T. Condo, L.R. Fortney, Edwin R. Hancock, G. E. Kalmus, W. A. Mann, R. I. Hulsizer, A. Napier, D. H. Brick, J. M. Butler, N. Fujiwara, R. Erickson, H. H. Bingham, B. Franek, W. M. Bugg, C. A. Woods, R. Sugahara, J. Schneps, J. Kent, A. P. T. Palounek, W. J. Robertson, P. W. Lucas, R. H. Milburn, G. Hall, M. Austern, and K. Takahashi

Subjects
Nuclear physics, Physics, Particle physics, Pion, Isovector, Meson, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Hadron, Mass spectrum, Elementary particle, Spectral line, Boson
Abstract

Evidence is presented for the charge-exchange photoproduction, in two distinct reactions, of an isovector {rho}{pi} state of mass {similar to}1775 MeV. Results of an analysis of the decay-angular distributions are also presented, from which it is concluded that {ital J}{sup {ital P}}=1{sup {minus}}, 2{sup {minus}}, or 3{sup +}.

Published
1991

2. Longitudinal-phase-space analysis ofπ+n→π+π−pat 15 GeV/c

Author

J.D. Kimel, Sharon Hagopian, B. Wind, J. R. Bensinger, C. P. Horne, Vasken Hagopian, N. D. Pewitt, J.E. Richey, H.O. Cohn, and J. E. Lannutti

Subjects
Baryon, Physics, Nuclear reaction, Nuclear physics, Antiparticle, Pion, Meson, Hadron, Analytical chemistry, Elementary particle, Nucleon
Abstract

3114 events of the reaction ..pi../sup +/d ..-->.. ..pi../sup +/..pi../sup -/pp/sub s/, where p/sub s/ is a nonparticipating spectator, were studied in the SLAC 82-inch bubble chamber. A longitudinal-phase-space (LPS) analysis was performed to separate the various t-channel exchange mechanisms, e.g., ..pi.. or Pomeron exchange. The validity of the LPS method was tested for pion exchange by generating events using the one-pion-exchange model modified by absorption (OPEA). The model and the data agreed extremely well. The principal features of the data include the rho/sup 0/, f/sup 0/, ..delta../sup 0/, and N*'s. The LPS analysis also reveals the g/sup 0/, but a slight modification of the standard LPS selection criteria enhances the g/sup 0/, as expected by OPEA-model calculations.

Published
1977

3. Inclusive photoproduction of neutral strange particles at 20 GeV

Author

C. Milstene, R. H. Milburn, S. Yamashita, K. Furuno, G. Hall, R. Merenyi, Edwin R. Hancock, W. A. Mann, J. S. Chima, R. Gearhart, S. W. O'neale, T. Handler, Aharon Levy, K. Abe, W. Cameron, A. V. Bevan, F. Ochiai, T. Sato, J. Ballam, K. Braune, H. J. Hargis, K. Takahashi, M. Jobes, P. W. Lucas, H.O. Cohn, J. J. Goldberg, Shlomo Dado, D. H. Brick, G. E. Kalmus, S. Noguchi, T. C. Bacon, Y. Ohtani, T. Kitagaki, H. H. Bingham, B. Franek, R. I. Hulsizer, Akira Yamaguchi, J. M. Butler, W. D. Walker, A. Napier, M. Widgoff, Y. Yoshimura, H. Sagawa, E. S. Hafen, K. C. Moffeit, A. H. Rogers, D. C. Colley, S. Tether, C. A. Woods, A. Suzuki, N. Fujiwara, George P Yost, R. N. Diamond, D. P. Kelsey, E. L. Hart, C. G. Wilkins, J. E. Brau, P. Rankin, H. Yuta, E. Ronat, David Gershoni, P. Haridas, A. M. Shapiro, H. Rudnicka, R. Sugahara, Shuji Tanaka, J. J. Murray, J. Schneps, T. Hayashino, J. Kent, T. Fieguth, J. T. Carroll, J. Shank, A. P. T. Palounek, C. V. Cautis, I. Hideta, G. P. Gopal, R. C. Field, G. T. Condo, R. Erickson, W. M. Bugg, S. Wolbers, R. K. Yamamoto, K. Tamai, Alfred Goshaw, K. Hasegawa, and I. A. Pless

Subjects
Baryon, Physics, Nuclear physics, Particle physics, Antiparticle, Meson, High Energy Physics::Phenomenology, Hadron, Hyperon, Elementary particle, Lambda, Boson
Abstract

We have studied inclusive production of ${K}_{S}^{0}$, $\ensuremath{\Lambda}$, and $\overline{\ensuremath{\Lambda}}$ particles in 20-GeV $\ensuremath{\gamma}p$ interactions and have found features similar to those observed in both hadronic and leptonic interactions. The production cross sections, charged-particle multiplicities, and average $\ensuremath{\Lambda}$ polarization are reported. Inclusive distributions of $x$ and ${p}_{T}$ are shown and discussed in terms of quark fragmentation models. Production cross sections for ${K}^{*}(890)$ and ${\ensuremath{\Sigma}}^{*}(1385)$ are also reported.

Published
1984

4. Charm photoproduction at 20 GeV

Author

A. Woods, F. Ohtani, I. M. Godfrey, A. M. Shapiro, H. Rudnicka, K. Takahashi, I. A. Pless, J. Ballam, J. E. Brau, A. Napier, Akira Yamaguchi, A. V. Bevan, C. Milstene, D. A. Waide, S. Wolbers, W. Cameron, K. Hasegawa, M. J. Harwin, H.O. Cohn, A. H. Rogers, G. P. Gopal, N. Fujiwara, Shlomo Dado, R. K. Yamamoto, J. Shank, C. C. Field, G. E. Kalmus, A. P. T. Palounek, W. D. Walker, T. Sato, W. J. Robertson, H. Sagawa, R. I. Hulsizer, R. N. Diamond, J. J. Goldberg, A. Suzuki, T. Kitagaki, D. P. Kelsey, K. Tamai, T. Glanzman, Y. Yoshimura, C. A. Woods, R. Merenyi, R. Sugahara, H. Yuta, S. J. Sewell, G. Hall, T. Handler, D. C. Colley, H. J. Hargis, J. Schneps, P. J. Dornana, J. Kent, K. Furuno, P. W. Lucas, Alfred Goshaw, R. Gearhart, S. Isacson, David Gershoni, S. Tether, S. Yamashita, Edwin R. Hancock, W. A. Mann, I. Hideta, Vasken Hagopian, R. Miburn, K. Braune, T. Hayashino, S. Noguchi, M. Widgoff, K. C. Moffeit, Aharon Levy, K. Abe, George P Yost, T. C. Bacon, P. Rankin, M. Jobes, W. M. Bugg, D. H. Brick, G. T. Condo, H. H. Bingham, B. Franek, E. Ronat, R. Erickson, J. S. Chima, S. W. O'neale, E. L. Hart, Shuji Tanaka, J. J. Murray, J. E. Lannutti, G. Yekutieli, J. M. Butler, and C. G. Wilkins

Subjects
Nuclear physics, Physics, Particle physics, Particle decay, Angular distribution, Elementary particle, Photon energy, Laser beams
Abstract

Sixty-two charm events have been observed in an exposure of the SLAC Hybrid Facility to a backward scattered laser beam. Based on 22 neutral and 21 charged decays we have measured the charmed-meson lifetimes to be tau/sub D//sup 0/ = (6.8/sub -1.8//sup +2.3/)= x 10/sup -13/ sec, tau/sub D//sup + -/ = (7.4/sub -2.0//sup +2.3/) x 10/sup -13/ sec and their ratio tau/sub D//sup + -//tau0 = 1.1/sub -0.3/ /sup +0.6/. The inclusive charm cross section at a photon energy of 20 GeV has been measured to be 56/sub -/23/sup +24/ nb. Evidence is presented for a non-DD-bar component to charm production, consistent with (35 +- 20)% ..lambda../sub c//sup +/ production and some D/sup asteriskplus-or-minus/ production. We have found no unambiguous F decays.

Published
1984

5. Lifetimes, cross sections, and production mechanisms of charmed particles produced by 20-GeV photons

Author

H. J. Hargis, P. Dingus, J. E. Brau, R. C. Field, D. C. Colley, Edwin R. Hancock, W. A. Mann, S. Tanaka, J. Schneps, J. M. Butler, T. Kafka, H. Yuta, A. Napier, James Shank, G. E. Kalmus, J. J. Murray, H. Sagawa, R. H. Milburn, A. M. Shapiro, R. Armenteros, T. C. Bacon, H.O. Cohn, S. Wolbers, D. P. Kelsey, V. R. O’Dell, R. A. Gearhart, C. A. Woods, A. Yamaguchi, K. Abe, J. J. Goldberg, George P Yost, G. Hall, M. Widgoff, T. Kitagaki, E. L. Hart, K. C. Moffeit, S. J. Sewell, D. A. Waide, J. Shimony, W. Cameron, I. M. Godfrey, M. Jobes, K. Braune, K. Tamai, R. Merenyi, G. T. Condo, P. Rankin, R. Erickson, W. M. Bugg, K. Hasegawa, D. H. Brick, H. H. Bingham, B. Franek, J. Ballam, T. Glanzman, and M. J. Harwin

Subjects
Nuclear physics, Physics, Particle physics, Photon, Meson, Hadron, Sigma, Elementary particle, Charm (quantum number), Photon energy, Boson
Abstract

Seventy-one events containing charmed-particle decays have been observed in an experiment using the SLAC Hybrid Facility exposed to a backward-scattered photon beam. Several improvements were made to the apparatus since the previous experiment on charm photoproduction. Results for the charmed-meson lifetimes are consistent with the published results from the previous experiment and the two data samples have been combined yielding a total sample of 136 charm events. After imposing rigorous cuts, 50 neutral, 48 charged, and 2 charged/neutral ambiguous decays remain. From these, the charmed-meson lifetimes are measured to be tau/sub D/ = (8.6 +- 1.3/sub -0.3/ /sup .7/) x 10 T sec, tau/sub D/ = (6.1 +- 0.9 +- 0.3) x 10 T sec, and their ratio tau/sub D/ /tau0 = 1.4 +- 0.3/sub -/ /sub 0.1//sup +0.2/. The total charm cross section at a photon energy of 20 GeV has been measured to be (62 +- 8/sub -/10 V) nb. There is evidence for both DD-barX and D-bar /sub c/ X production with sigma/sub D/ /sub c/ X/sigma/sub charm/ = (71 +- 11 +- 6)%.

Published
1986

6. Someg(1700)decay modes

Author

P. Haridas, Yong-Shi Wu, G. T. Condo, S. H. Oh, I. A. Pless, J. P. Silverman, Akira Yamaguchi, P. C. Trepagnier, R. I. Hulsizer, E. S. Hafen, Fernando Barreiro, V. Kistiakowsky, T. Maruyama, H. Yuta, D. Hochman, K. Tamai, S. Tanaka, T. Kitagaki, J. E. Brau, A. Napier, Yoshinobu Unno, O. Benary, R. K. Yamamoto, R. Kikuchi, T. Handler, H.O. Cohn, M. F. Hodous, K. Abe, Kazuo Hasegawa, S. Noguchi, J. Wolfson, R. Dolfini, T. Nozaki, W. M. Bugg, Y. Otani, and E. L. Hart

Subjects
Physics, Particle physics, Antiparticle, Meson, Branching fraction, Nuclear Theory, Hadron, Elementary particle, Omega, Particle decay, Antimatter, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment
Abstract

From a study of 8-GeV/c ..pi../sup -/p interactions, the various two-pion and four-pion decay channels available to the g/sup -/ meson have been investigated. Our results indicate that the dominant 4..pi.. decay modes involve intermediate rho and ..omega.. production without significant A/sub 2/ formation.

Published
1982

7. Inclusive photoproduction of strange baryons at 20 GeV

Author

A. M. Shapiro, M. J. Harwin, R. Merenyi, E. L. Hart, R. I. Hulsizer, G. E. Kalmus, D. A. Waide, J. Ballam, A. Napier, I. M. Godfrey, S. Yamashita, W. Cameron, K. Tamai, M. Jobes, F. Ochiai, R. Sugahara, K. Braune, R. Erickson, S. W. O'neale, H. Sagawa, T. Handler, J. M. Butler, D. C. Colley, D. H. Brick, G. Hall, C. G. Wilkins, W. M. Bugg, A. Levy, H. Yuta, P. W. Lucas, D. P. Kelsey, S. J. Sewell, S. Tether, S. Wolbers, H. H. Bingham, B. Franek, K. C. Moffeit, T. Kitagaki, Edwin R. Hancock, R. K. Yamamoto, R. Milburn, J. E. Brau, K. Takahashi, W. A. Mann, A. P.T. Palounek, Y. Yoshimura, H.O. Cohn, W. D. Walker, R. C. Field, J. Shank, R. Diamond, C. Milstene, T. Sato, J. Schneps, A. T. Goshaw, P. Rankin, T. Kafka, S. Tanaka, W. J. Robertson, K. Abe, R. Armenteros, A. Suzuki, T. Glanzman, N. Fujiwara, G. P. Yost, H. J. Hargis, S. Dado, M. Widgoff, P. Dingus, I. A. Pless, T. C. Bacon, S. Noguchi, J. J. Goldberg, K. Hasegawa, and Akira Yamaguchi

Subjects
Physics, Antiparticle, Particle physics, Meson, Hadron, Hyperon, High Energy Physics::Experiment, Elementary particle, Production (computer science), Lambda, Omega
Abstract

Cross sections are presented for the inclusive photoproduction of ${K}_{S}^{0}$, \ensuremath{\Lambda}, \ensuremath{\Lambda}\ifmmode\bar\else\textasciimacron\fi{}, ${\ensuremath{\Xi}}^{\mathrm{\ensuremath{-}}}$, \ensuremath{\Xi}\ifmmode\bar\else\textasciimacron\fi{}${\mathrm{}}^{\mathrm{\ensuremath{-}}}$, ${\ensuremath{\Sigma}}^{0}$, and ${\ensuremath{\Sigma}}^{\mathrm{*}\ifmmode\pm\else\textpm\fi{}}$(1385) at 20 GeV. An upper limit to ${\ensuremath{\Omega}}^{\mathrm{\ensuremath{-}}}$ production is also given. The data come from 284 000 hadronic events photoproduced in the SLAC 1-m hydrogen-bubble-chamber hybrid facility exposed to a nearly monochromatic, polarized 20-GeV backscattered photon beam. A comparison of the ${K}_{S}^{0}$, \ensuremath{\Lambda}, \ensuremath{\Lambda}\ifmmode\bar\else\textasciimacron\fi{}, and ${\ensuremath{\Xi}}^{\mathrm{\ensuremath{-}}}$ rates per inelastic event to ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$p data show that \ensuremath{\gamma}p rates are consistent with being higher than the ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$p rates, providing evidence of an ss\ifmmode\bar\else\textasciimacron\fi{} component of the photon. The pair cross sections for ${K}_{S}^{0}$${K}_{S}^{0}$, ${K}_{S}^{0}$\ensuremath{\Lambda}, ${K}_{S}^{o}$\ensuremath{\Lambda}\ifmmode\bar\else\textasciimacron\fi{}, and \ensuremath{\Lambda}\ensuremath{\Lambda}\ifmmode\bar\else\textasciimacron\fi{} are presented. The ${x}_{F}$ distributions of the \ensuremath{\Lambda}, \ensuremath{\Lambda}\ifmmode\bar\else\textasciimacron\fi{}, and ${\ensuremath{\Xi}}^{\mathrm{\ensuremath{-}}}$ are compared to a quark-diquark fusion model, giving information on strange-baryon photoproduction mechanisms.

Published
1985

8. Search for a threshold enhancement in theγp→charmed baryon + charmed meson cross section

Author

K. Tamai, B. Franek, H. Yuta, J. M. Butler, P. Dingus, T. C. Bacon, D. C. Colley, R. Merenyi, D. A. Waide, W. Cameron, T. Glanzman, R. Erickson, Geoffrey Hall, J. E. Brau, D. H. Brick, I. A. Pless, H. J. Hargis, H. H. Bingham, Edwin R. Hancock, R. C. Field, R. Gearhart, S. Wolbers, T. Kitagaki, Hiroyuki Sagawa, George P Yost, W. M. Bugg, Kenji Hasegawa, J. Shank, T. Kafka, M. Widgoff, M. J. Harwin, G. E. Kalmus, M. Jobes, Shlomo Dado, R. I. Hulsizer, H.O. Cohn, C. A. Woods, R. K. Yamamoto, J. Shimony, I. M. Godfrey, V. R. O’Dell, P. Rankin, D. P. Kelsey, K. Abe, Aharon Levy, K. Braune, E. Ronat, S. J. Sewell, E. L. Hart, Akira Yamaguchi, Shuji Tanaka, and J. J. Murray

Subjects
Physics, Baryon, Nuclear physics, Particle physics, Cross section (physics), Meson, Branching fraction, Hadron, Elementary particle, Charm (quantum number), Threshold energy
Abstract

Results of a search for a predicted enhancement of several microbarns in the charm-photoproduction cross section just above threshold are reported. No charm decays were detected, from which an upper limit to the charm cross section of 94 nb (90% C.L.) at E/sub ..gamma../approx. =10 GeV was obtained. Upper limits in the range 270 to 450 nb were also obtained for the peak cross sections for threshold enhancements in ..gamma..p..-->..D/sup -/..sigma../sub c//sup + +/ and similar channels.

Published
1984

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