J. Dworkin
University of Michigan
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Physical Review Letters | 1990
C. James; K. Heller; P. Border; J. Dworkin; O. E. Overseth; R. Rameika; G. Valenti; R. Handler; B.G. Lundberg; L. Pondrom; M. Sheaff; C. Wilkinson; A. Beretvas; P. Cushman; T. Devlin; K. B. Luk; G. B. Thomson; R. Whitman
We have measured the branching ratio {Gamma}({Xi}{sup 0}{r arrow}{Lambda}{gamma})/{Gamma}({Xi}{sup 0}{r arrow}{Lambda}{pi}{sup 0}) to be (1.06{plus minus}0.12(stat){plus minus}0.11(syst)){times}10{sup {minus}3}. In 670 000 {Lambda}{gamma} candidates we found 116{plus minus}13 {Xi}{sup 0}{r arrow}{Lambda}{gamma} decays (background subtracted). These compare with 29 510 {Xi}{sup 0}{r arrow}{Lambda}{pi}{sup 0} events reconstructed from the {Lambda}{gamma}{gamma} sample. Monte Carlo studies gave the relative acceptances for the two processes. The helicity of the {Lambda} yielded the product of asymmetry parameters {alpha}({Lambda}{r arrow}{ital p}{pi}{sup {minus}}){alpha}({Xi}{sup 0}{r arrow}{Lambda}{gamma})=0.27{plus minus}0.28, which implies {alpha}({Xi}{sup 0}{r arrow}{Lambda}{gamma})=0.43{plus minus}0.44, where the uncertainty is all statistical.
AIP Conf. Proc.; (United States) | 2008
B. Lundberg; G. Bunce; R. Handler; R. Grobel; R. March; P. Martin; L. Pondrom; M. Sheaff; C. Wilkinson; P. T. Cox; J. Dworkin; Edmond Craig Dukes; O. E. Overseth; P. Skubic; K. Heller; C. James; A. Beretvas; L. Deck; T. Devlin; B. Edelman; R. T. Edwards; K. B. Luk; J. Norem; P. Petersen; R. Rameika; L. Schachinger; G. B. Thomson; R. Whitman; P. Yamin
We report here polarization results from a series of Fermilab experiments from the years 1974 through 1980, with some preliminary data from a high pT polarization experiment completed in February 1982. The Λ polarization has a remarkably simple and interesting behavior when expressed as a function of xF and pT.
Physical Review Letters | 1990
C. James; K. Heller; P. Border; J. Dworkin; O. E. Overseth; R. Rameika; G. Valenti; R. Handler; B.G. Lundberg; L. Pondrom; M. Sheaff; C. Wilkinson; A. Beretvas; P. Cushman; T. Devlin; K. B. Luk; G. B. Thomson; R. Whitman
We have measured the branching ratio {Gamma}({Xi}{sup 0}{r arrow}{Lambda}{gamma})/{Gamma}({Xi}{sup 0}{r arrow}{Lambda}{pi}{sup 0}) to be (1.06{plus minus}0.12(stat){plus minus}0.11(syst)){times}10{sup {minus}3}. In 670 000 {Lambda}{gamma} candidates we found 116{plus minus}13 {Xi}{sup 0}{r arrow}{Lambda}{gamma} decays (background subtracted). These compare with 29 510 {Xi}{sup 0}{r arrow}{Lambda}{pi}{sup 0} events reconstructed from the {Lambda}{gamma}{gamma} sample. Monte Carlo studies gave the relative acceptances for the two processes. The helicity of the {Lambda} yielded the product of asymmetry parameters {alpha}({Lambda}{r arrow}{ital p}{pi}{sup {minus}}){alpha}({Xi}{sup 0}{r arrow}{Lambda}{gamma})=0.27{plus minus}0.28, which implies {alpha}({Xi}{sup 0}{r arrow}{Lambda}{gamma})=0.43{plus minus}0.44, where the uncertainty is all statistical.
Physical Review Letters | 1990
C. James; K. Heller; P. Border; J. Dworkin; O. E. Overseth; Regina Abby Rameika; G. Valenti; R. Handler; B. Lundberg; L. Pondrom; M. Sheaff; C. Wilkinson; A. Beretvas; P. Cushman; T. Devlin; K. B. Luk; G. B. Thomson; R. Whitman
We have measured the branching ratio {Gamma}({Xi}{sup 0}{r arrow}{Lambda}{gamma})/{Gamma}({Xi}{sup 0}{r arrow}{Lambda}{pi}{sup 0}) to be (1.06{plus minus}0.12(stat){plus minus}0.11(syst)){times}10{sup {minus}3}. In 670 000 {Lambda}{gamma} candidates we found 116{plus minus}13 {Xi}{sup 0}{r arrow}{Lambda}{gamma} decays (background subtracted). These compare with 29 510 {Xi}{sup 0}{r arrow}{Lambda}{pi}{sup 0} events reconstructed from the {Lambda}{gamma}{gamma} sample. Monte Carlo studies gave the relative acceptances for the two processes. The helicity of the {Lambda} yielded the product of asymmetry parameters {alpha}({Lambda}{r arrow}{ital p}{pi}{sup {minus}}){alpha}({Xi}{sup 0}{r arrow}{Lambda}{gamma})=0.27{plus minus}0.28, which implies {alpha}({Xi}{sup 0}{r arrow}{Lambda}{gamma})=0.43{plus minus}0.44, where the uncertainty is all statistical.
Physical Review Letters | 1990
C. James; K. Heller; P. Border; J. Dworkin; O. E. Overseth; Regina Abby Rameika; G. Valenti; R. Handler; B. Lundberg; L. Pondrom; M. Sheaff; C. Wilkinson; A. Beretvas; P. Cushman; T. Devlin; K. B. Luk; G. B. Thomson; R. Whitman
We have measured the branching ratio {Gamma}({Xi}{sup 0}{r arrow}{Lambda}{gamma})/{Gamma}({Xi}{sup 0}{r arrow}{Lambda}{pi}{sup 0}) to be (1.06{plus minus}0.12(stat){plus minus}0.11(syst)){times}10{sup {minus}3}. In 670 000 {Lambda}{gamma} candidates we found 116{plus minus}13 {Xi}{sup 0}{r arrow}{Lambda}{gamma} decays (background subtracted). These compare with 29 510 {Xi}{sup 0}{r arrow}{Lambda}{pi}{sup 0} events reconstructed from the {Lambda}{gamma}{gamma} sample. Monte Carlo studies gave the relative acceptances for the two processes. The helicity of the {Lambda} yielded the product of asymmetry parameters {alpha}({Lambda}{r arrow}{ital p}{pi}{sup {minus}}){alpha}({Xi}{sup 0}{r arrow}{Lambda}{gamma})=0.27{plus minus}0.28, which implies {alpha}({Xi}{sup 0}{r arrow}{Lambda}{gamma})=0.43{plus minus}0.44, where the uncertainty is all statistical.
AIP Conf. Proc.; (United States) | 1983
R. Handler; R. Grobel; B. Lundberg; L. Pondrom; M. Sheaff; C. Wilkinson; A. Beretvas; L. Deck; T. Devlin; B. Luk; R. Rameika; P. T. Cox; C. Dukes; J. Dworkin; O. E. Overseth; K. Keller
Measurements of the magnetic moments of the Ξ−, Σ+ and Σ− baryons are presented. The values found are μΞ−=−.69±.04, μΣ+=2.31±.027 and μΣ−=−.89±.14, in units μN. The Ξ− and Σ− results are final, while the Σ+ value is based on a preliminary analysis of about 22% of the data sample.
AIP Conf.Proc. | 1982
R. Rameika; J. Dworkin; P. Petersen; A. Beretvas; L. Deck; C. James; K. B. Luk; L. Pondrom; M. Sheaff; B. Lundberg; O. E. Overseth; P. T. Cox; Kenneth J. Heller; C. Wilkinson; G. Thomsom; T. Devlin; P. Skubic; R. Handler; R. Whitman; G. Bunce; R. Grobel
Inclusive hyperon production by 400 GeV protons at Fermilab has shown that the hyperons are produced with significant polarization. However no polarization has been seen for Λ’s produced at these energies. In this paper we present the results of a searcch for Ξ0 polarization.
Archive | 1981
M. Sheaff; R. Grobel; R. Handler; B. Lundberg; R. March; L. Pondrom; C. Wilkinson; P. T. Cox; O. E. Overseth; C. Dukes; J. Dworkin; A. Beretvas; T. Devlin; L. Schachinger; P. Skubic; L. Deck; B. Luk; R. Rameika; R. Whitman; K. Heller; G. Bunce
Measurements of the magnetic moments of the Λ, Ξ°, Ξ-, Σ+, and Σ-hyperons have been made or are under analysis by the neutral/charged hyperon beam group at Fermi National Accelerator Laboratory. Results to date give μΛ = -.6138±.0047 n.m., μΞ° = -1.253±.014 n.m., and μΞ- = -.75±.06 n.m.. The electric dipole moment of the A has also been measured to be dΛ = (-3.0±7.4)×10-17 e-cm.
Physical Review Letters | 1978
K. Heller; P. T. Cox; J. Dworkin; O. E. Overseth; P. Skubic; L. Schachinger; T. Devlin; B. Edelman; R. T. Edwards; G. Bunce; R. Handler; R. March; P. Martin; L. Pondrom; M. Sheaff
Physical Review Letters | 1978
L. Schachinger; J. Dworkin; R. Handler; G. Bunce; L. Pondrom; B. Edelman; M. Sheaff; P. Martin; O. E. Overseth; P. T. Cox; K. Heller; R. March; T. Devlin; P. Skubic; R. T. Edwards