M. J. Leitch
Los Alamos National Laboratory
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Featured researches published by M. J. Leitch.
Physical Review Letters | 1999
M. Vasiliev; M. E. Beddo; C. N. Brown; T. A. Carey; T. H. Chang; W. E. Cooper; C. A. Gagliardi; G. T. Garvey; D. F. Geesaman; E. A. Hawker; X. He; L. Isenhower; Daniel M. Kaplan; S. Kaufman; D. D. Koetke; W. M. Lee; M. J. Leitch; P. L. McGaughey; J. M. Moss; B. A. Mueller; V. Papavassiliou; J. C. Peng; G. Petitt; P. E. Reimer; M. E. Sadler; W. E. Sondheim; P. W. Stankus; R. S. Towell; R. E. Tribble; J. C. Webb
A precise measurement of the ratios of the Drell-Yan cross section per nucleon for an 800 GeV/{ital c} proton beam incident on Be, Fe, and W targets is reported. The behavior of the Drell-Yan ratios at small target-parton momentum fraction is well described by an existing fit to the shadowing observed in deep-inelastic scattering. The cross-section ratios as a function of the incident-parton momentum fraction set tight limits on the energy loss of quarks passing through a cold nucleus. {copyright} {ital 1999} {ital The American Physical Society}
Physical Review Letters | 2007
L. Zhu; J. C. Peng; P. E. Reimer; T. C. Awes; M. L. Brooks; C. N. Brown; J. D. Bush; T. A. Carey; T. H. Chang; W. E. Cooper; C. A. Gagliardi; G. T. Garvey; D. F. Geesaman; E. A. Hawker; X. He; L. Isenhower; Daniel M. Kaplan; S. Kaufman; S. Klinksiek; D. D. Koetke; D. M. Lee; W. M. Lee; M. J. Leitch; N. Makins; P. L. McGaughey; J. M. Moss; B. A. Mueller; P. M. Nord; V. Papavassiliou; B. K. Park
We report a measurement of the angular distributions of Drell-Yan dimuons produced using an 800 GeV/c proton beam on a deuterium target. The muon angular distributions in the dilepton rest frame have been measured over the kinematic range 4.5<m{mu mu}<15 GeV/c{2}, 0<p{T}<4 GeV/c, and 0<x{F}<0.8. No significant cos2phi dependence is found in these proton-induced Drell-Yan data, in contrast with the situation for pion-induced Drell-Yan data. The data are compared with expectations from models which attribute the cos2phi distribution to a QCD vacuum effect or to the presence of the transverse-momentum-dependent Boer-Mulders structure function h{1}{perpendicular}. Constraints on the magnitude of the sea-quark h{1}{perpendicular} structure functions are obtained.
Physical Review D | 2001
R. S. Towell; P. L. McGaughey; E. A. Hawker; M. E. Sadler; B. K. Park; M. L. Brooks; D. M. Lee; R. E. Tribble; J. D. Bush; M. E. Beddo; Y. C. Wang; T. H. Chang; B. A. Mueller; Paul E. Reimer; W. M. Lee; D. F. Geesaman; T. A. Carey; X. He; S. Kaufman; D. D. Koetke; C. A. Gagliardi; P. Kirk; P. W. Stankus; G. R. Young; Z. F. Wang; T. C. Awes; J. M. Moss; W. E. Sondheim; Vasilev; M. J. Leitch
Measurements of the ratio of Drell-Yan yields from an 800 \rm{GeV/c} proton beam incident on liquid hydrogen and deuterium targets are reported. Approximately 360,000 Drell-Yan muon pairs remained after all cuts on the data. From these data, the ratio of anti-down (
Physical Review Letters | 2001
Mikkel B. Johnson; B. Z. Kopeliovich; I. K. Potashnikova; P. L. McGaughey; J. M. Moss; J. C. Peng; G. T. Garvey; M. J. Leitch; M. Adams; D. M. Alde; H. W. Baer; M. L. Barlett; C. N. Brown; W. E. Cooper; T. A. Carey; G. Danner; G. W. Hoffmann; Y. B. Hsiung; D. M. Kaplan; A. Klein; Christopher Lee; J. W. Lillberg; R. L. McCarthy; C. S. Mishra; M. Wang
\bar{d}
Physical Review Letters | 1989
J. C. Peng; M. J. Leitch; J. D. Bowman; F. Irom; J. Kapustinsky; T.K. Li; L. C. Liu; Mishra Cs; J. E. Simmons; Z.F. Wong; C. Smith; R. R. Whitney
) to anti-up (
Physical Review Letters | 2008
L. Y. Zhu; P. E. Reimer; B. A. Mueller; T. C. Awes; M. L. Brooks; C. N. Brown; J. D. Bush; T. A. Carey; T. H. Chang; W. E. Cooper; C. A. Gagliardi; G. T. Garvey; D. F. Geesaman; E. A. Hawker; X. He; D. Howell; L. Isenhower; Daniel M. Kaplan; S. Kaufman; S. Klinksiek; D. D. Koetke; D. M. Lee; W. M. Lee; M. J. Leitch; N. Makins; P. L. McGaughey; J. M. Moss; P. M. Nord; V. Papavassiliou; B. K. Park
\bar{u}
Physical Review Letters | 2003
T. H. Chang; M. E. Beddo; C. N. Brown; T. A. Carey; W. E. Cooper; C. A. Gagliardi; G. T. Garvey; D. F. Geesaman; E. A. Hawker; X. He; L. Isenhower; Daniel M. Kaplan; S. Kaufman; D. D. Koetke; P. L. McGaughey; W. M. Lee; M. J. Leitch; J. M. Moss; B. A. Mueller; V. Papavassiliou; J. C. Peng; P. E. Reimer; M. E. Sadler; W. E. Sondheim; P. W. Stankus; R. S. Towell; R. E. Tribble; M. A. Vasiliev; J. C. Webb; J. L. Willis
) quark distributions in the proton sea is determined over a wide range in Bjorken-
Physics Letters B | 1990
Z. Weinfeld; E. Piasetzky; M. J. Leitch; H. W. Baer; C. S. Mishra; J. Tinsley; D. H. Wright
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Physics Letters B | 1988
S. H. Rokni; H. W. Baer; A. G. Bergmann; J. D. Bowman; F. Irom; M. J. Leitch; C. J. Seftor; J. Alster; E. Piasetzky; B.L. Clausen; R. A. Loveman; R.J. Peterson; J.L. Ullmann; J. N. Knudson; U. Sennhauser
. These results confirm previous measurements by E866 and extend them to lower
Nuclear Physics | 1983
H.W. Baer; Richard D. Bolton; J.D. Bowman; M.D. Cooper; F. Cverna; N.S.P. King; M. J. Leitch; H.S. Matis; J. Alster; A. Doron; A. Erell; M. A. Moinester; E. Blackmore; E. R. Siciliano
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