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Your search keyword '"J. R. P. Mahon"' showing total 7 results
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7 results on '"J. R. P. Mahon"'

1. ptandxFdependence of the polarization ofΣ+hyperons produced by 800 GeV/cprotons

Author

A. Morelos, I. F. Albuquerque, N. F. Bondar, R. Carrigan, D. Chen, P. S. Cooper, Dai Lisheng, A. S. Denisov, A. V. Dobrovolsky, T. Dubbs, A. M. F. Endler, C. O. Escobar, M. Foucher, V. L. Golovtsov, H. Gottschalk, P. Gouffon, V. T. Grachev, A. V. Khanzadeev, M. A. Kubantsev, N. P. Kuropatkin, J. Lach, null Lang Pengfei, V. N. Lebedenko, null Li Chengze, null Li Yunshan, M. Luksys, J. R. P. Mahon, E. McCliment, C. Newsom, M. C. Pommot Maia, V. M. Samsonov, V. A. Schegelsky, null Shi Huanzhang, V. J. Smith, Tang Fukun, N. K. Terentyev, S. Timm, I. I. Tkatch, L. N. Uvarov, A. A. Vorobyov, null Yan Jie, Zhao Wenheng, null Zheng Shuchen, and null Zhong Yuanyuan

Subjects
Physics, Nuclear physics, Hyperon, Sigma, Nuclear Experiment, Polarization (waves), Lambda
Abstract

We utilize the angle and momentum resolution of our apparatus to study the polarization of 375 GeV/c Sigma(+) hyperons produced by 800 GeV/c protons incident on a Cu target. By examining in detail two of our high statistics data samples, we find evidence for structure in the p(t) dependence of Sigma(+) polarization and are able to extract the x(F) dependence of the Sigma(+) polarization and compare it with x(F) behavior in the Lambda(0) and Xi(-) systems.

Published
1995
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2. Measurement of the branching ratio and asymmetry parameter for theΣ+→pγ radiative decay

Author

Lang Pengfei, N. P. Kuropatkin, V. T. Grachev, Vincent J Smith, Shi Huanzhang, M. C. Pommot Maia, I. I. Tkatch, N. F. Bondar, A. Morelos, A. V. Dobrovolsky, M. A. Kubantsev, M. Luksys, Yan Jie, V.A. Schegelsky, T. Dubbs, V. L. Golovtsov, Zhao Wenheng, Zheng Shuchen, Alexei Khanzadeev, I. F. Albuquerque, Li Chengze, An.A. Vorobyov, A. S. Denisov, P. Gouffon, Carlos Escobar, E. McCliment, J. R. P. Mahon, M. Foucher, L. N. Uvarov, Dai Lisheng, R.A. Carrigan, P. S. Cooper, Tang Fukun, A. M. F. Endler, C. R. Newsom, H. Gottschalk, Li Yunshan, D Chen, N. K. Terentyev, S. Timm, J. Lach, Zhong Yuanyuan, V. M. Samsonov, and J. Langland

Subjects
Nuclear physics, Physics, Particle physics, Branching fraction, media_common.quotation_subject, Hyperon, Radiative decay, Sigma, High Energy Physics::Experiment, Asymmetry, media_common
Abstract

We have measured the branching ratio for the hyperon radiative decay ${\mathrm{\ensuremath{\Sigma}}}^{+}$\ensuremath{\rightarrow}p\ensuremath{\gamma} using the Fermilab polarized charged hyperon beam. This measurement and our previously published result on the asymmetry parameter in the same decay are part of Fermilab experiment E761. We find B(${\mathrm{\ensuremath{\Sigma}}}^{+}$\ensuremath{\rightarrow}p\ensuremath{\gamma})/B(${\mathrm{\ensuremath{\Sigma}}}^{+}$\ensuremath{\rightarrow}p${\mathrm{\ensuremath{\pi}}}^{0}$) to be [2.32\ifmmode\pm\else\textpm\fi{}0.11(stat)\ifmmode\pm\else\textpm\fi{}0.10(syst)]\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}3}$ with a sample of 31 901 events. The higher statistics and careful attention to systematic uncertainties make these significant improvements over previous measurements. We describe how our measurements were performed and briefly review the theoretical implications of these results.

Published
1995
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3. Measurement of the branching ratio for theΞ−→Σ−γ radiative decay

Author

Yan Jie, Dai Lisheng, Shi Huanzhang, Lang Pengfei, D. Chen, M. C. Pommot Maia, A. V. Dobrovolsky, M. Luksys, J. R. P. Mahon, N. K. Terentyev, E. McCliment, Tang Fukun, A. M. F. Endler, H. Gottschalk, A. V. Khanzadeev, N. F. Bondar, V.A. Schegelsky, A. A. Vorobyov, Zhong Yuanyuan, P. S. Cooper, M. A. Kubantsev, M. Foucher, A. Morelos, J. Lach, P. Gouffon, A. S. Denisov, C. R. Newsom, I. F. Albuquerque, S. Timm, L. N. Uvarov, Zhao Wenheng, Li Yunshan, Zheng Shuchen, N. P. Kuropatkin, V. T. Grachev, Li Chengze, I. I. Tkatch, T. Dubbs, Carlos Escobar, R. Carrigan, Vincent J Smith, V. L. Golovtsov, and V. M. Samsonov

Subjects
Physics, Baryon, Particle physics, Particle decay, Branching fraction, Hadron, Hyperon, General Physics and Astronomy, Lambda, Xi baryon, Sigma baryon
Abstract

We have measured the branching ratio for the hyperon radiative decay [Xi][sup [minus]][r arrow][Sigma][sup [minus]][gamma] from a sample of 211[plus minus]33 events obtained in the polarized 375 GeV/[ital c] charged hyperon beam at Fermilab. We find [ital B]([Xi][sup [minus]][r arrow][Sigma][sup [minus]][gamma]/[Xi][sup [minus]][r arrow][Lambda][sup 0][pi][sup [minus]])=(1.22[plus minus]0.23[plus minus]0.06)[times]10[sup [minus]4] where the quoted errors are statistical and systematic, respectively. We have also obtained an indication that the sign of the asymmetry parameter of this decay is positive.

Published
1994
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4. Polarization ofΣ+and Σ¯−hyperons produced by 800-GeV/cprotons

Author

P. Gouffon, M. Foucher, M. Luksys, V.A. Schegelsky, A. V. Dobrovolsky, Li Yunshan, Zhao Wenheng, Zheng Shuchen, I. I. Tkatch, Lang Pengfei, Yan Jie, Vincent J Smith, J. Lach, N. P. Kuropatkin, V. T. Grachev, J. R. P. Mahon, Tang Fukun, A. M. F. Endler, Dai Lisheng, H. Gottschalk, Shi Huanzhang, A. A. Vorobyov, N. K. Terentyev, A. V. Khanzadeev, M. A. Kubantsev, A. S. Denisov, V. M. Samsonov, E. McCliment, A. Morelos, S. Timm, R.A. Carrigan, Zhong Yuanyuan, D Chen, T. Dubbs, V. L. Golovtsov, I. F. Albuquerque, Li Chengze, L. N. Uvarov, M. C. Pommot Maia, N. F. Bondar, Carlos Escobar, P. S. Cooper, and C. R. Newsom

Subjects
Physics, Hyperon, General Physics and Astronomy, Sigma, High Energy Physics::Experiment, Elementary particle, Atomic physics, Nuclear Experiment, Polarization (waves), Sigma baryon
Abstract

We have measured the polarization of 375-GeV/c SIGMA+ and SIGMABAR- hyperons produced by 800-GeV/c protons incident on a Cu target. We find that the SIGMA+ polarization rises with increasing p(t) to a maximum of 16% at p(t) = 1.0 GeV/c and then decreases to 10% at p(t) = 1.8 GeV/c. We compare this SIGMA+ polarization with data at lower energies. The SIGMABAR- polarization has been measured for the first time. It has the same sign as the SIGMA+ but smaller magnitude in a similar kinematical region.

Published
1993
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5. First observation of magnetic moment precession of channeled particles in bent crystals

Author

A. Morelos, Wh Zhao, J. Yan, Vl Golovtsov, Av Khanzadeev, Ma Kubantsev, S. Timm, Av Dobrovolsky, Nf Bondar, If Albuquerque, C. R. Newsom, Ln Uvarov, Pf Lang, Aa Vorobyov, Vv Baublis, J. R. P. Mahon, Tang Fukun, A. M. F. Endler, Co Escobar, Yy Zhong, Vn Lebedenko, H. Gottschalk, Sc Zheng, Vm Samsonov, Np Kuropatkin, P. Gouffon, Vj Smith, Vt Grachev, T. Dubbs, Cr Sun, Ps Cooper, Ls Dai, Nk Terentyev, Cz Li, Va Schegelsky, Pa Goritchev, Hz Shi, J. Lach, D Chen, M. Foucher, Mcp Maia, Ys Li, Ra Carrigan, As Denisov, E. McCliment, and Tkatch

Subjects
Physics, Nuclear physics, Magnetic moment, Bent molecular geometry, Precession, General Physics and Astronomy, Elementary particle, Fermion, Atomic physics, Spin (physics), Sigma baryon, Magnetic field
Abstract

Spin precession of channeled particles in bent crystals has been observed for the first time. Polarized SIGMA+ were channeled using bent Si crystals. These crystals provided an effective magnetic field of 45 T which resulted in a measured spin precession of 60-degrees +/- 17-degrees. This agrees with the prediction of 62-degrees +/- 2-degrees using the world average of SIGMA+ magnetic moment measurements. This new technique gives a SIGMA+ magnetic moment of (2.40 +/- 0.46 +/- 0.40),mu(N), where the quoted uncertainties are statistical and systematic, respectively. We see no evidence of depolarization in the channeling process.

Published
1992
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6. Measurement of theΣ¯−lifetime and direct comparison with theΣ+lifetime

Author

Zhao Wenheng, Zheng Shuchen, J. Langland, D Chen, Alexei Khanzadeev, I. F. Albuquerque, P. S. Cooper, C. R. Newsom, L. N. Uvarov, A. V. Dobrovolsky, Li Yunshan, An.A. Vorobyov, Carlos Escobar, I. I. Tkatch, J. Lach, S. Timm, Li Chengze, Dai Lisheng, P. Gouffon, Zhong Yuanyuan, M. Luksys, R.F. Barbosa, V.A. Schegelsky, Vincent J Smith, Tang Fukun, A. M. F. Endler, A. S. Denisov, H. Gottschalk, M. Foucher, N. P. Kuropatkin, V. T. Grachev, J. R. P. Mahon, V. L. Golovtsov, T. Dubbs, Kubantsev, V. M. Samsonov, Yan Jie, E. McCliment, R.A. Carrigan, Shi Huanzhang, N. K. Terentyev, Lang Pengfei, A. Morelos, M. C. Pommot Maia, and N. F. Bondar

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Hyperon, Sigma
Published
1999
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7. A Search for Light Super Symmetric Baryons

Author

M. C. Pommot Maia, N. F. Bondar, I. F. Albuquerque, L. N. Uvarov, J. R. P. Mahon, P. S. Cooper, J. Lach, A. Morelos, WH Zhao, C. R. Newsom, J. Langland, An.A. Vorobyov, I. I. Tkatch, Vincent J Smith, Dai Lisheng, M. Foucher, A. M. F. Endler, T. Dubbs, H. Gottschalk, M. Luksys, V.A. Schegelsky, A. S. Denisov, V. L. Golovtsov, Carlos Escobar, Chloe Li, SC Zheng, N. K. Terentyev, A. V. Khanzadeev, J. Yan, A. V. Dobrovolsky, E. McCliment, R.A. Carrigan, F. Tang, Yanhong Li, PF Lang, M. A. Kubantsev, S. Timm, HZ Shi, N. P. Kuropatkin, V. T. Grachev, P. Gouffon, D. Chen, YY Zhong, and V. M. Samsonov

Subjects
Physics, Nuclear reaction, Particle physics, Proton, Hadron, Hyperon, FOS: Physical sciences, General Physics and Astronomy, Elementary particle, Charged particle, High Energy Physics - Experiment, Baryon, High Energy Physics - Experiment (hep-ex), Crystallography, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Production (computer science)
Abstract

We have searched for the production and decay of light super-symmetric baryons produced in 800 GeV/c proton copper interactions in a charged hyperon beam experiment. We observe no evidence for the decays R+(uud \g^~) -> S(uds \g^~) pi+ and X-(ssd \g^~) -> S(uds \g^~) pi- in the predicted parent mass and lifetime ranges of 1700-2500 Mev/c2 and 50-500 ps. Production upper limits for R+ at xF=0.47, Pt=1.4 GeV/c2 and X- at xF=0.48, Pt=0.65 GeV/c2 of less than 10^-3 of all charged secondary particles produced are obtained for all but the highest masses and shortest lifetimes predicted., 9 pages, uuencoded postscript 4 figures uuencoded, tar-compressed file (submitted to PRL)

Published
1996

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