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Inclusive D and D* production in e+e- annihilation at 29 GeV

Physical Review Letters 51:13 (1983) 1147-1150

Authors:

S Ahlen, C Akerlof, G Baranko, P Baringer, I Beltrami, D Bender, D Blockus, B Brabson, J Chapman, Y Cho, ST Chui, B Cork, R DeBonte, M Derrick, S Ems, D Errede, E Fernandez, GE Forden, R Fries, KK Gan, G Gieraltowski, SW Gray, JP Guillaud, N Harnew, L Hyman, K Jaeger, L Keller, P Kesten, R Klem, D Koltick, P Kooijman, S Kooijman, F Loeffler, JS Loos, F LoPinto, U Mallik, R McIlwain, DI Meyer, DH Miller, B Musgrave, H Neal, CR Ng, D Nitz, H Ogren, PP Ong, LE Price, LK Rangan, D Rubin, D Rust, J Schlereth, P Schreiner, AA Seidl, EI Shibata, R Singer, P Smith, R Stevens, R Thun, T Trinko, M Valdata-Nappi, J Va'vra, LT Wang, C Ward, JM Weiss, M Willutzky, RJ Wilson, DE Wood

Abstract:

Inclusive production of (D0, D̄0) and D± mesons have been observed in e+e- annihilation at 29 GeV. The signals correspond to R values of R(D0+D̄0)=3.25±1.2 and R(D++D-)=1.35±0.6. D*± production is also observed via the process D*+→D0π+ and its charge conjugate. The D and D* production rates are compared. © 1983 The American Physical Society.
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The operation of a pressurized ultraviolet photoionization threshold cerenkov counter

IEEE Transactions on Nuclear Science 29:1 (1982) 332-335

Authors:

J Chapman, N Harnew, DI Meyer

Abstract:

We have successfully tested an ultraviolet photoionization Cerenkov Counter in a 10 GeV/c pion beam preparatory to building a large system. The counter has been tested to 11 atmospheres of pressure for use as a pi-K separator. Copyright © 1982 by The Institute of Electrical and Electronics Engineers, Inc.
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THE OPERATION OF A PRESSURIZED ULTRAVIOLET PHOTO-IONIZATION THRESHOLD CERENKOV COUNTER

IEEE TRANSACTIONS ON NUCLEAR SCIENCE 29:1 (1982) 332-335

Authors:

J CHAPMAN, N HARNEW, DI MEYER
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The operation of a pressurized ultraviolet photoionization threshold cherenkov counter

Nuclear Instruments and Methods 186:3 (1981) 513-518

Authors:

N Harnew, DI Meyer

Abstract:

We have successfully tested an ultraviolet photoionization Cherenkov counter in a 10 GeV/c pion beam. The counter has been tested to 11 atm pressure for use as a π-K separator. The design and operation of the counter is described. © 1981.
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An amplitude analysis of ππ scattering from new data on the reaction π-p→π+π-n

Nuclear Physics, Section B 157:2 (1979) 250-272

Authors:

MJ Corden, JD Dowell, J Garvey, M Jobes, IR Kenyon, J Mawson, T McMahon, IF Corbett, RJ Esterling, NH Lipman, PJ Litchfield, KCTO Sumorok, G Alexander, S Dagan, Y Gnat, EH Bellamy, MG Green, N Harnew, JB Lister, JR Lister, AW Robertson, BJ Stacey, JA Strong, DH Thomas

Abstract:

We have carried out a partial-wave analysis of ππ scattering in the mass range 1.0 to 2.08 GeV/c2. We find solutions similar to those obtained in previous analyses below 1.8 GeV/c2 but, in addition, we obtain a new solution which does not suffer from violations of unitarity and is compatible with data from other channels. This solution, when continued to 2.08 GeV/c2, shows a g meson with mass and width of 1.734± 0.010 GeV/c2and 0.322±0.035 GeV/c2 respectively, and an h meson with mass 1.935±0.013 GeV/c2and width 0.263±0.057 GeV/c2. The L = 2 partial wave contains the f meson and an additional resonance with parameters m = 1.502±0.025 Gev/c2, Γ = 0.165±0.042 GeV/c2and x = 0.19±0.03. If we associate this state with the f′(1514), our ππ branching fraction is considerably higher than previous determinations. An SU(3) fit to the 2+ nonet yields a mixing angle of 38.4± 1.3°. © 1979.
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