N. Harnew
University of Michigan
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Featured researches published by N. Harnew.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1989
N. Harnew; G.P. Heath; M.D. Jeffs; J. Nash; G.L. Salmon; P.D. Shield; D.J. White; Ff Wilson
Abstract A method of vertex triggering which uses a time difference measurement to determine the z coordinate of a track is under development for the ZEUS Central Tracking Detector. This incorporates a pipelined readout system. We describe the system and report on its performance.
Physics Letters B | 1986
M. Derrick; K. K. Gan; P. Kooijman; J. S. Loos; B. Musgrave; L. E. Price; James Schlereth; K. Sugano; J.M. Weiss; D.E. Wood; D. Blockus; B. Brabson; S.W. Gray; C. Jung; H. A. Neal; H. Ogren; D. R. Rust; M. Valdata-Nappi; C. Akerlof; G. Bonvicini; J. Chapman; D. Errede; N. Harnew; P. Kesten; D.I. Meyer; D. Nitz; A.A. Seidl; R. P. Thun; T. Trinko; M. Willutzky
Abstract The charged particle multiplicity distribution for e+e− annihilations at s = 29 GeV has been measured using the High Resolution Spectrometer at PEP. The multiplicity distribution, expressed as a function of the mean, shows KNO scaling when compared to e+e− data at other energies. Multiplicity distributions for particles selected in different central rapidity spans are presented. All of these are well presented by the Negative binomial distribution. As the rapidity span is narrowed, the distributions become broader and approach a constant value of the parameter k.
Physics Letters B | 1987
R. Ansari; P. Bagnaia; M. Banner; R. Battiston; K. Bernlöhr; C.N. Booth; K. Borer; M. Borghini; G. Carboni; V. Cavasinni; P. Cenci; J.C. Chollet; A.G. Clark; C. Conta; F. Costantini; Pierre Darriulat; B. De Lotto; T. Del Prete; L. Di Lella; J. Dines-Hansen; K. Einsweiler; L. Fayard; Roberto Ferrari; M. Fraternali; D. Froidevaux; J.M. Gaillard; O. Gildemeister; V.G. Goggi; C. Gössling; B. Hahn
Abstract A study has been made of the decays W → ev and Z → e + e − , using the UA2 detector at the CERN pp Collider. The data correspond to an integrated luminosity of 142 nb −1 at a centre-of-mass collision energy √ s =546 GeV, and 768 nb −1 at √ s =630 GeV. Measurements of the standard model parameters from samples of 251 W decay and 39 Z decay candidates are compared with expectations of the standard electroweak model.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1989
C.B. Brooks; F.W. Bullock; R. Cashmore; Robin Devenish; B. Foster; T.J. Fraser; M.D. Gibson; R.S. Gilmore; Dm Gingrich; N. Harnew; J. C. Hart; G.P. Heath; J.W. Hiddleston; A.R. Holmes; A.K. Jamdagni; T. W. Jones; T.J. Llewellyn; K.R. Long; G.J. Lush; J. Malos; N.C. Martin; I. McArthur; Na Mccubbin; D. McQuillan; D.B. Miller; M.M. Mobayyen; C.J.S. Morgado; J. Nash; G. Nixon; A.G. Parham
Abstract The design concept and development of the ZEUS central tracking detector is described. This is a cylindrical drift chamber designed for track reconstruction, electron identification and event triggering in a high-crossing-rate, high-magnetic-field environment.
Physics Letters B | 1986
J. A. Appel; P. Bagnaia; M. Banner; R. Battiston; K. Bernlöhr; K. Borer; M. Borghini; G. Carboni; V. Cavasinni; P. Cenci; J.C. Chollet; A.G. Clark; C. Conta; Pierre Darriulat; B. De Lotto; T. Del Prete; L. DiLella; J. Dines-Hansen; K. Einsweiler; R. Engelmann; L. Fayard; M. Fraternali; D. Froidevaux; J.-M. Gaillard; O. Gildemeister; V.G. Goggi; C. Gössling; B. Hahn; H. Hänni; John Renner Hansen
Abstract Using the UA2 apparatus, the inclusive cross section has been measured for production of high- p T direct photons in pp collisions at s =546 GeV and s =630 GeV . The results are in good agreement with QCD predictions.
Physics Letters B | 1985
M. Derrick; K. K. Gan; P. Kooijman; J. S. Loos; B. Musgrave; Lawrence Price; James Schlereth; K. Sugano; J.M. Weiss; D.E. Wood; D. Blockus; B. Brabson; S.W. Gray; C. Jung; H. A. Neal; H. Ogren; D. R. Rust; M. Valdata-Nappi; C. Akerlof; G. Bonvicini; J. Chapman; D. Errede; N. Harnew; P. Kesten; D.I. Meyer; D. Nitz; A.A. Seidl; R. P. Thun; T. Trinko; M. Willutzky
The charged particle multiplicities of the quark and gluon jets in the three-fold symmetric e+e− → qqg events at √s = 29 GeV have been studied using the high resolution spectrometer at PEP. A value of 〈n〉g = 6.7−2.1+1.1±1.0 for gluon jet s with an energy of 9.7−2.0+1.5 GeV is measured. The ratio, 〈n〉g/〈n〉q, is 1.29−0.41+0.21±0.20, which i s significantly lower than the value of 94 naively expected from the ration of the gluon-to-quark color charges.
Physics Letters B | 1987
R. Ansari; P. Bagnala; M. Banner; R. Battiston; K. Bernlöhr; C.N. Booth; K. Borer; M. Borghini; G. Carboni; V. Cavasinni; P. Cenci; J.C. Chollet; A.G. Clark; C. Conta; F. Costantini; Pierre Darriulat; B. De Lotto; T. Del Prete; L. Di Lella; J. Dines-Hansen; K. Einsweiler; L. Fayard; Roberto Ferrari; M. Fraternali; D. Froidevaux; J.-M. Gaillard; O. Gildemeister; V.G. Goggi; C. Gössling; B. Hahn
Abstract The total UA2 data sample at the CERN pp Collider corresponds to an integrated luminosity of 910 nb −1 . Limits on various hypothetical processes, such as production of excited electrons, additional charged or neutral vector bosons, or supersymmetric particles, are presented from the analysis of this sample.
Physics Letters B | 1985
M. Derrick; P. Kooijman; J. S. Loos; B. Musgrave; L. E. Price; J. L. Schlereth; K. Sugano; J.M. Weiss; D.E. Wood; P. Baringer; D. Blockus; B. Brabson; S.W. Gray; C. Jung; H. A. Neal; H. Ogren; D. R. Rust; M. Valdata-Nappi; C. Akerlof; G. Bonvicini; J. Chapman; D. Errede; N. Harnew; P. Kesten; D. I. Meyer; D. Nitz; A.A. Seidl; R. P. Thun; T. Trinko; M. Willutzky
Abstract The production of neutral K∗(890) and ρ0 mesons was studied in e+e− annihilation at s =29 GeV using the High Resolution Spectrometer at PEP. Differential cross sections are presented as a function of the scaled energy variable z and compared to π0 and K0 production. The measured multiplicities are 0.84±0.08 ϱ0 mesons and 0.57±0.09 K ∗0 (890) mesons per event for a meson momentum greater than 725 MeV/c. The ratios of vector meson to pseudoscalar meson production for (u,d), s and c quark are compared to predictions of the Lund model.
Physics Letters B | 1984
M. Derrick; E. Fernandez; R. Fries; L. Hyman; P. Kooijman; J. S. Loos; B. Musgrave; L. E. Price; J. L. Schlereth; K. Sugano; J.M. Weiss; D.E. Wood; S. Ahlen; G. Baranko; P. Baringer; D. Blockus; B. Brabson; M. Daigo; G. E. Forden; S.W. Gray; J.-P. Guillaud; C. Jung; H. A. Neal; H. Ogren; D. R. Rust; M. Valdata-Nappi; C. Akerlof; J. Chapman; D. Errede; N. Harnew
Abstract The electroweak production asymmetry and the decay fragmentation function for e + e − → c c have been measured at s = 29 GeV using charged D ∗ production over the full kinematic range. The data were taken at PEP using the High Resolution Spectrometer. The measured asymmetry is −0.12 ± 0.08. The total production cross section in units of the point cross section corrected for initial state radiation is R D ∗ = 2.7 ± 0.9 .
Physics Letters B | 1985
P. Kesten; C. Akerlof; G. Bonvicini; J. Chapman; D. Errede; N. Harnew; D.I. Meyer; D. Nitz; A.A. Seidl; R. P. Thun; T. Trinko; M. Willutzky; M. Derrick; P. Kooijman; J. S. Loos; B. Musgrave; Lawrence Price; James Schlereth; K. Sugano; J.M. Weiss; D.E. Wood; P. Baringer; D. Blockus; B. Brabson; S.W. Gray; C. Jung; H. A. Neal; H. Ogren; D. R. Rust; M. Valdata-Nappi
Abstract Separate samples of charm quark and light quark (u, d, s) jets have been isolated in an experiment studying e + e − annihilations at s = 29 GeV . The results come from data corresponding to an integrated luminosity of 111 pb −1 collected by the High Resolution Spectrometer. Differences were observed in charged multiplicities, momentum distributions, and rapidity of the size expected from the different fragmentation functions and leading particle decay properties of the two samples.
