R. A. Johnson
University of Colorado Boulder
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Featured researches published by R. A. Johnson.
Physical Review D | 2006
M. Tzanov; D. Naples; S. Boyd; John McDonald; V. Radescu; R. A. Johnson; N. Suwonjandee; M. Vakili; J. M. Conrad; B.T. Fleming; J. Formaggio; J.H. Kim; S. Koutsoliotas; C. McNulty; A. Romosan; M. H. Shaevitz; P. Spentzouris; E. G. Stern; A. Vaitaitis; E. D. Zimmerman; R. H. Bernstein; L. Bugel; M.J. Lamm; W. Marsh; P. Nienaber; N. Tobien; J. Yu; T. Adams; A. Alton; T. A. Bolton
The NuTeV experiment at Fermilab has obtained a unique high statistics sample of neutrino and anti-neutrino interactions using its high-energy sign-selected beam. We present a measurement of the differential cross section for charged-current neutrino and anti-neutrino scattering from iron. Structure functions, F{sub 2}(x,Q{sup 2}) and xF{sub 3}(x,Q{sup 2}), are determined by fitting the inelasticity, y, dependence of the cross sections. This measurement has significantly improved systematic precision as a consequence of more precise understanding of hadron and muon energy scales.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2012
S. Assylbekov; G. Barr; B. E. Berger; H. G. Berns; D. Beznosko; A. Bodek; R. Bradford; N. J. Buchanan; H. S. Budd; Y. Caffari; K. Connolly; I. Danko; R. Das; S. Davis; M. Day; S. A. Dytman; M. Dziomba; R. Flight; D. A. Forbush; K. Gilje; D. Hansen; J. Hignight; J. Imber; R. A. Johnson; C. K. Jung; V. Kravtsov; P. T. Le; G. D. Lopez; C.J. Malafis; S. Manly
Abstract The pi–zero detector (POD) is one of the subdetectors that makes up the off-axis near detector for the Tokai-to-Kamioka (T2K) long baseline neutrino experiment. The primary goal for the POD is to measure the relevant cross-sections for neutrino interactions that generate π 0 s, especially the cross-section for neutral current π 0 interactions, which are one of the dominant sources of background to the ν μ → ν e appearance signal in T2K. The POD is composed of layers of plastic scintillator alternating with water bags and brass sheets or lead sheets and is one of the first detectors to use Multi-Pixel Photon Counters (MPPCs) on a large scale.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2000
D. A. Harris; J. Yu; T. Adams; A. Alton; S. Avvakumov; L. de Barbaro; P. de Barbaro; R. H. Bernstein; Arie Bodek; T. A. Bolton; James Brau; D. Buchholz; H. S. Budd; L. Bugel; J. M. Conrad; R. B. Drucker; B.T. Fleming; R. Frey; J. Formaggio; J. Goldman; M. Goncharov; R. A. Johnson; J.H. Kim; S. Koutsoliotas; Govind S. Krishnaswami; M.J. Lamm; W. Marsh; D. Mason; C. McNulty; Kevin Scott McFarland
Abstract NuTeV is a neutrino–nucleon deep-inelastic scattering experiment at Fermilab. The detector consists of an iron-scintillator sampling calorimeter interspersed with drift chambers, followed by a muon toroidal spectrometer. We present determinations of response and resolution functions of the NuTeV calorimeter for electrons, hadrons, and muons over an energy range from 4.8 to 190xa0GeV. The absolute hadronic energy scale is determined to an accuracy of 0.43%. We compare our measurements to predictions from calorimeter theory and GEANT3 simulations.
Journal of Physics G | 1996
U.K. Yang; P. Auchincloss; P. de Barbaro; A. Bodek; H. S. Budd; D. A. Harris; W. K. Sakumoto; W C Lefmann; R. Steiner; M. J. Oreglia; B.A. Schumm; R. A. Johnson; M. Nussbaum; L Perera; M. Vakili; G Arroyo; A.O. Bazarko; J. M. Conrad; J.H. Kim; B.J. King; S. Koutsoliotas; C. McNulty; S.R. Mishra; P. Z. Quintas; A. Romosan; F. Sciulli; W.G. Seligman; M. H. Shaevitz; P. Spentzouris; E. G. Stern
Measurements of neutrino - nucleon and antineutrino - nucleon differential cross sections using the CCFR neutrino detector at Fermilab have been used to extract preliminary values of in the kinematic region 0.01 < x < 0.6 and . The new data provide the first measurements of R in the region x < 0.1. The x and dependence of R is compared with a QCD-based fit to previous data. The QCD fit, which provides an estimate of R in the small-x region where R has not been previously measured, is in good agreement with the new CCFR data.
Archive | 2008
A. A. Aguilar-Arevalo; C. E. Anderson; L. Bartoszek; A. O. Bazarko; S. J. Brice; B. C. Brown; L. Bugel; Jun Cao; L. Coney; J. M. Conrad; D. C. Cox; A. Curioni; Z. Djurcic; D. A. Finley; R. Ford; F. G. Garcia; G. T. Garvey; C. Green; T. L. Hart; E. Hawker; R. Imlay; R. A. Johnson; G. Karagiorgi; P. Kasper; T. Katori; I. Kourbanis; S. Koutsoliotas; E. M. Laird; S. K. Linden; Y. Liu
Physical Review D | 2009
A. A. Aguilar-Arevalo; C. E. Anderson; A. O. Bazarko; S. J. Brice; B. C. Brown; L. Bugel; J. Cao; L. Coney; J. M. Conrad; D. C. Cox; A. Curioni; Z. Djurcic; D. A. Finley; B. T. Fleming; R. Ford; F. G. Garcia; G. T. Garvey; C. Green; J. A. Green; T. L. Hart; E. Hawker; R. Imlay; R. A. Johnson; G. Karagiorgi; P. Kasper; T. Katori; T. Kobilarcik; I. Kourbanis; S. Koutsoliotas; E. M. Laird
Physical Review Letters | 2007
D. Mason; J. Brau; R. B. Drucker; R. Frey; P. Spentzouris; J. M. Conrad; B. T. Fleming; J. Formaggio; J.H. Kim; S. Koutsoliotas; C. McNulty; A. Romosan; M. H. Shaevitz; E. G. Stern; A. Vaitaitis; E. D. Zimmerman; R. A. Johnson; N. Suwonjandee; M. Vakili; R. H. Bernstein; L. Bugel; M.J. Lamm; W. Marsh; P. Nienaber; N. Tobien; J. Yu; T. Adams; A. Alton; T. A. Bolton; J. Goldman
Physical Review Letters | 2009
A. A. Aguilar-Arevalo; C. E. Anderson; A. O. Bazarko; S. J. Brice; B. C. Brown; L. Bugel; J. Cao; L. Coney; J. M. Conrad; D. C. Cox; A. Curioni; Z. Djurcic; D. A. Finley; B. T. Fleming; R. Ford; F. G. Garcia; G. T. Garvey; J. Grange; C. Green; J. A. Green; T. L. Hart; E. Hawker; R. Imlay; R. A. Johnson; G. Karagiorgi; P. Kasper; T. Katori; T. Kobilarcik; I. Kourbanis; S. Koutsoliotas