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Your search keyword '"M. Foucher"' showing total 10 results
Start Over Author "M. Foucher" Journal physical review letters
10 results on '"M. Foucher"'

1. 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

2. Measurement of the magnetic moments of theΣ+and Σ¯−hyperons

Author

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

Subjects
Baryon, Physics, Antiparticle, Proton, Magnetic moment, CPT symmetry, General Physics and Astronomy, Sigma, High Energy Physics::Experiment, Fermion, Statistical physics, Atomic physics, Sigma baryon
Abstract

We have measured the magnetic moments of the SIGMA+ and SIGMABAR- hyperons produced by 800-GeV protons incident on a Cu target. We determine the SIGMA+ magnetic moment to be (2.4613 +/- 0.0034 +/- 0.0040)mu(N) where the uncertainties are statistical and systematic, respectively. In this first measurement we determine the magnetic moment of the SIGMABAR- to be -(2.428 +/- 0.036 +/- 0.007)mu(N). The magnetic moments of the SIGMA+ and SIGMABAR- are consistent with each other in magnitude but opposite in sign as required by CPT invariance.

Published
1993

3. 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

4. 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

5. Measurement of the asymmetry parameter in the hyperon radiative decayΣ+→pγ

Author

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

Subjects
Physics, Nuclear physics, Baryon, Particle physics, Particle decay, Hadron, Hyperon, General Physics and Astronomy, High Energy Physics::Experiment, Elementary particle, Fermion, Charged particle, Sigma baryon
Abstract

We have measured the asymmetry parameter (${\mathrm{\ensuremath{\alpha}}}_{\ensuremath{\gamma}}$) in the hyperon radiative decay ${\mathrm{\ensuremath{\Sigma}}}^{+}$\ensuremath{\rightarrow}p\ensuremath{\gamma} with a sample of 34 754\ifmmode\pm\else\textpm\fi{}212 events obtained in a polarized charged hyperon beam experiment at Fermilab. We find ${\mathrm{\ensuremath{\alpha}}}_{\ensuremath{\gamma}}$=-0.720\ifmmode\pm\else\textpm\fi{}0.086\ifmmode\pm\else\textpm\fi{}0.045, where the quoted errors are statistical and systematic, respectively.

Published
1992

6. Measurement of the branching ratio for the Xi ---> Sigma - gamma radiative decay.

Author

Dubbs T, Albuquerque IF, Bondar NF, Carrigan R Jr, Chen D, Cooper PS, Lisheng D, Denisov AS, Dobrovolsky AV, Endler AM, Escobar CO, Foucher M, Golovtsov VL, Gottschalk H, Gouffon P, Grachev VT, Khanzadeev AV, Kubantsev MA, Kuropatkin NP, Lach J, Pengfei L, Chengze L, Yunshan L, Luksys M, Mahon JR, McCliment E, Morelos A, Newsom C, Pommot Maia MC, Samsonov VM, Schegelsky VA, Huanzhang S, Smith VJ, Fukun T, Terentyev NK, Timm S, Tkatch II II, Uvarov LN, Vorobyov AA, Jie Y, Wenheng Z, Shuchen Z, and Yuanyuan Z

Published
1994
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7. Measurement of the magnetic moments of the Sigma + and Sigma -bar- hyperons.

Author

Morelos A, Albuquerque IF, Bondar NF, Carrigan RA Jr, Chen D, Cooper PS, Lisheng D, Denisov AS, Dobrovolsky AV, Dubbs T, Endler AM, Escobar CO, Foucher M, Golovtsov VL, Gottschalk H, Gouffon P, Grachev VT, Khanzadeev AV, Kubantsev MA, Kuropatkin NP, Lach J, Lang Pengfei, Li Chengze, Li Yunshan, Luksys M, Mahon JR, McCliment E, Newsom C, Pommot Maia MC, Samsonov VM, Schegelsky VA, Shi Huanzhang, Smith VJ, Tang Fukun, Terentyev NK, Timm S, Tkatch II II, Uvarov LN, Vorobyov AA, Yan Jie, Zhao Wenheng, Shuchen Z, and Zhong Yuanyuan

Published
1993
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8. Polarization of Sigma + and Sigma -bar- hyperons produced by 800-GeV/c protons.

Author

Morelos A, Albuquerque IF, Bondar NF, Carrigan RA Jr, Chen D, Cooper PS, Dai Lisheng, Denisov AS, Dobrovolsky AV, Dubbs T, Endler AM, Escobar CO, Foucher M, Golovtsov VL, Gottschalk H, Gouffon P, Grachev VT, Khanzadeev AV, Kubantsev MA, Kuropatkin NP, Lach J, Lang Pengfei, Li Chengze, Li Yunshan, Luksys M, Mahon JR, McCliment E, Newsom C, Pommot Maia MC, Samsonov VM, Schegelsky VA, Shi Huanzhang, Smith VJ, Tang Fukun, Terentyev NK, Timm S, Tkatch II II, Uvarov LN, Vorobyov AA, Yan Jie, Zhao Wenheng, Zheng Shuchen, and Zhong Yuanyuan

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

Author

Chen D, Albuquerque IF, Baublis VV, Bondar NF, Carrigan RA Jr, Cooper PS, Lisheng D, Denisov AS, Dobrovolsky AV, Dubbs T, Endler AM, Escobar CO, Foucher M, Golovtsov VL, Goritchev PA, Gottschalk H, Gouffon P, Grachev VT, Khanzadeev AV, Kubantsev MA, Kuropatkin NP, Lach J, Lang Pengfei, Lebedenko VN, Li Chengze, Li Yunshan, Mahon JR, McCliment E, Morelos A, Newsom C, Pommot Maia MC, Samsonov VM, Schegelsky VA, Shi Huanzhang, Smith VJ, Sun CR, Tang Fukun, Terentyev NK, Timm S, Tkatch II II, Uvarov LN, Vorobyov AA, Yan Jie, Zhao Wenheng, Zheng Shuchen, and Zhong Yuanyuan

Published
1992
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10. Measurement of the asymmetry parameter in the hyperon radiative decay Sigma +-->p gamma.

Author

Foucher M, Albuquerque IF, Bondar NF, Carrigan R Jr, Chen D, Li Chengze, Cooper PS, Denisov AS, Dobrovolsky AV, Dubbs T, Endler AM, Escobar CO, Tang Fukun, Golovtsov VL, Goritchev PA, Gottschalk H, Gouffon P, Grachev VT, Shi Huanzhang, Yan Jie, Khanzadeev AV, Kubantsev MA, Kuropatkin NP, Lach J, Luksys M, Lebedenko VN, Dai Lisheng, Mahon JR, McCliment E, Morelos A, Newsom C, Lang Pengfei, Pommot Maia MC, Samsonov VM, Zheng Shuchen, Smith VJ, Terentyev NK, Timm S, Tkatch II II, Uvarov LN, Vorobyov AA, Zhao Wenheng, Zhong Yuanyuan, and Li Yunshan

Published
1992
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