Professor Brian Foster OBE, FRS: Publications

Charge asymmetry and weak interaction effects in e⁺e^-→μ⁺μ^- and e⁺e^-→τ⁺τ^-

Physics Letters B 110:2 (1982) 173-180

Authors:

R Brandelik, W Braunschweig, K Gather, FJ Kirschfink, K Lübelsmeyer, HU Martyn, G Peise, J Rimkus, HG Sander, D Schmitz, D Trines, W Wallraff, H Boerner, HM Fischer, H Hartmann, E Hilger, W Hillen, G Knop, L Köpke, H Kolanoski, B Löhr, R Wedemeyer, N Wermes, M Wollstadt, H Burkhardt, S Cooper, D Heyland, H Hultschig, P Joos, W Koch, U Kötz, H Kowalski, A Ladage, D Lüke, HL Lynch, P Mättig, KH Mess, D Notz, J Pyrlik, DR Quarrie, R Riethmüller, A Shapira, P Söding, G Wolf, R Fohrmann, M Holder, HL Krasemann, P Leu, D Pandoulas, G Poelz, O Römer, P Schmüser, BH Wiik, I Al-Agil, R Beuselinck, DM Binnie, AJ Campbell, PJ Dornan, DA Garbutt, TD Jones, WG Jones, SL Lloyd, JK Sedgbeer, RA Stern, S Yarker, KW Bell, MG Bowler, IC Brock, RJ Cashmore, R Carnegie, R Devenish, P Grossmann, J Illingworth, M Ogg, GL Salmon, J Thomas, TR Wyatt, C Youngman, B Foster, JC Hart, J Harvey, J Proudfoot, DH Saxon, PL Woodworth, E Duchovni, Y Eisenberg, U Karshon, G Mikenberg, D Revel, E Ronat, T Barklow, J Freeman, T Meyer, G Rudolph, E Wicklund, SL Wu, G Zobernig

Abstract:

We have measured, at an average centre-of-mass energy of 34.22 GeV a forward-backward charge asymmetry in the reaction e+e-→μ+μ- of value -0.161 ± 0.032. This demonstrates the existence of an axial vector neutral current with coupling strength of geagμa=0.53 ± 0.10. We have also obtained a limit on the vector coupling strength of gevgμv<0.12. The Weinberg angle is found to be sin2θW=0.29+0.09-0.11. From the reaction e+e-→τ+τ- we have found geagτa<0.34, gevgτv<0.55. © 1982.

Angular correlations in γγ→��0��0 near threshold

Zeitschrift Fur Physik C Particles and Fields 16:1 (1982) 13-25

Authors:

M Althoff, W Braunschweig, K Gather, FJ Kirschfink, K Lübelsmeyer, HU Martyn, G Peise, J Rimkus, HG Sander, D Schmitz, H Siebke, D Trines, W Wallraff, H Boerner, HM Fischer, H Hartmann, E Hilger, W Hillen, G Knop, L Köpke, H Kolanoski, R Wedemeyer, N Wermes, M Wollstadt, H Burkhardt, S Cooper, J Franzke, H Hultschig, P Joos, W Koch, U Kötz, H Kowalski, A Ladage, B Löhr, D Lüke, P Mättig, KH Mess, D Notz, J Pyrlik, DR Quarrie, R Riethmüller, W Schütte, P Söding, G Wolf, G Yekutieli, M Dittmar, R Fohrmann, HL Krasemann, P Leu, E Lohrmann, D Pandoulas, G Poelz, O Römer, P Schmüser, BH Wiik, I Al-Agil, R Beuselinck, DM Binnie, AJ Campbell, PJ Dornan, DA Garbutt, TD Jones, WG Jones, SL Lloyd, J McCardle, JK Sedgebeer, KW Bell, MG Bowler, IC Brock, RJ Cashmore, R Carnegie, PEL Clarke, R Devenish, P Grossmann, J Illingworth, GL Salmon, J Thomas, TR Wyatt, C Youngman, B Foster, JC Hart, J Harvey, J Proudfoot, DH Saxon, PL Woodworth, D Heyland, M Holder, E Duchovni, Y Eisenberg, U Karshon, G Mikenberg, D Revel, E Ronat, A Shapira, T Barklow, T Meyer, G Rudolph, H Venkataramania, E Wicklund, SL Wu

Abstract:

We present an analysis of ��⁰��⁰ production by two photons in the ��⁰��⁰ invariant mass range from 1.2 to 2.0 GeV. From a study of the angular correlations in the process γγ→��⁰��⁰→϶�^-π⁺π^- we exclude a dominant contribution from J^P=0^- or 2^- states. The data indicate sizeable contributions from J^P=0⁺ for four pion masses M4π<1.7 GeV and from J^P=2⁺ for M4π>1.7 GeV. The data are also well described by a model with isotropic production and uncorrelated isotropic decay of the ��^0,s. The cross section stays high below the nominal ��⁰��⁰ threshold, i.e. M4π<1.5 GeV. The matrix element for ��⁰��⁰ production is found to decrease steeply with increasing M4π. Upper limits for the couplings of the ι(1440) and Θ(1640) to γγ and ��⁰��⁰ are given:Γ(ι→γγ)·B(ι→�� ⁰��⁰)<1.0 keV and Γ(Θ→γγ) © 1982 Springer-Verlag.

Exclusive proton-antiproton production in two-photon collisions

Physics Letters B 108:1 (1982) 67-70

Authors:

R Brandelik, W Braunschweig, K Gather, FJ Kirschfink, K Lübelsmeyer, HU Martyn, G Peise, J Rimkus, HG Sander, D Schmitz, AS von Dratzig, D Trines, W Wallraff, H Boerner, HM Fischer, H Hartmann, E Hilger, W Hillen, G Knop, L Köpke, H Kolanoski, P Leu, R Wedemeyer, N Wermes, M Wollstadt, H Burkhardt, S Cooper, D Heyland, H Hultschig, P Joos, W Koch, U Kötz, H Kowalski, A Ladage, D Lüke, HL Lynch, P Mättig, KH Mess, D Notz, J Pyrlik, DR Quarrie, R Riethmüller, A Shapira, P Söding, BH Wiik, G Wolf, R Fohrmann, M Holder, HL Krasemann, G Poelz, O Römer, P Schmüser, I Al-Agil, R Beuselinck, DM Binnie, AJ Campbell, PJ Dornan, DA Garbutt, TD Jones, WG Jones, SL Lloyd, D Pandoulas, JK Sedgebeer, RA Stern, S Yarker, MG Bowler, IC Brock, RJ Cashmore, R Devenish, P Grossmann, J Illingworth, M Ogg, GL Salmon, J Thomas, TR Wyatt, C Youngman, KW Bell, B Foster, JC Hart, J Proudfoot, DH Saxon, PL Woodworth, E Duchovni, Y Eisenberg, U Karshon, G Mikenberg, D Revel, E Ronat, T Barklow, J Freeman, T Meyer, G Rudolph, E Wicklund, SL Wu, G Zobernig

Abstract:

Production of proton-antiproton pairs by two-photon scattering has been observed at the electron-position storage ring PETRA. A total of eight proton-antiproton pairs have been identified using the time-of-flight technique. We have measured a total cross section of 4.5 ± 0.8 nb in the photon-photon c.m. energy range 2.0-2.6 GeV. © 1982.

π0 production by e+e- annihilation at 14 and 34 GeV c.m. energy

Physics Letters B 108:1 (1982) 71-76

Authors:

R Brandelik, W Braunschweig, K Gather, FJ Kirschfink, K Lübelsmeyer, HU Martyn, G Peise, J Rimkus, HG Sander, D Schmitz, AS von Dratzig, D Trines, W Wallraff, H Boerner, HM Fischer, H Hartmann, E Hilger, W Hillen, G Knop, L Köpke, H Kolanoski, P Leu, R Wedemeyer, N Wermes, M Wollstadt, H Burkhardt, S Cooper, D Heyland, H Hultschig, P Joos, W Koch, U Kötz, H Kowalski, A Ladage, D Lüke, HL Lynch, P Mättig, KH Mess, D Notz, J Pyrlik, DR Quarrie, R Riethmüller, A Shapira, P Söding, BH Wiik, G Wolf, R Fohrmann, M Holder, HL Krasemann, G Poelz, O Römer, P Schmüser, I Al-Agil, R Beuselinck, DM Binnie, AJ Campbell, PJ Dornan, DA Garbutt, TD Jones, WG Jones, SL Lloyd, D Pandoulas, JK Sedgbeer, RA Stern, S Yarker, MG Bowler, IC Brock, RJ Cashmore, R Devenish, P Grossmann, J Illingworth, M Ogg, GL Salmon, J Thomas, TR Wyatt, C Youngman, KW Bell, B Foster, JC Hart, J Proudfoot, DH Saxon, PL Woodworth, E Duchovni, Y Eisenberg, U Karshon, G Mikenberg, D Revel, E Ronat, T Barklow, J Freeman, T Meyer, G Rudolph, E Wicklund, SL Wu, G Zobernig

Abstract:

The process e⁺e^-→ π⁰ + anything has been measured at c.m. energies of 14 and 34 GeV for π⁰ energies between 0.5 and 4 GeV. The ratio of π⁰ to π^± production for π momenta between 0.5 and 1.5 GeV/c is measured to be 2σ(π⁰)/ [σ(π⁺) + σ(π^-)] = 1.3 ± 0.4 (1.2 ± 0.4) at 14 (34) GeV. The scaled cross section (s/μ)dσ/dx when compared with lower energy (4.9-7.4 GeV) π⁰ data indicates a substantial scaling violation. © 1982.

ANGULAR-CORRELATIONS IN GAMMA-GAMMA-]RHO0-RHO0 NEAR THRESHOLD

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 16:1 (1982) 13-25

Authors:

M ALTHOFF, W BRAUNSCHWEIG, K GATHER, FJ KIRSCHFINK, K LUBELSMEYER, HU MARTYN, G PEISE, J RIMKUS, HG SANDER, D SCHMITZ, H SIEBKE, D TRINES, W WALLRAFF, H BOERNER, HM FISCHER, H HARTMANN, E HILGER, W HILLEN, G KNOP, L KOPKE, H KOLANOSKI, R WEDEMEYER, N WERMES, M WOLLSTADT, H BURKHARDT, S COOPER, J FRANZKE, H HULTSCHIG, P JOOS, W KOCH, U KOTZ, H KOWALSKI, A LADAGE, B LOHR, D LUKE, P MATTIG, KH MESS, D NOTZ, J PYRLIK, DR QUARRIE, R RIETHMULLER, W SCHUTTE, P SODING, G WOLF, G YEKUTIELI, M DITTMAR, R FOHRMANN, HL KRASEMANN, P LEU, E LOHRMANN, D PANDOULAS, G POELZ, O ROMER, P SCHMUSER, BH WIIK, I ALAGIL, R BEUSELINCK, DM BINNIE, AJ CAMPBELL, PJ DORNAN, DA GARBUTT, TD JONES, WG JONES, SL LLOYD, J MCCARDLE, JK SEDGEBEER, KW BELL, MG BOWLER, IC BROCK, RJ CASHMORE, R CARNEGIE, PEL CLARKE, R DEVENISH, P GROSSMANN, J ILLINGWORTH, GL SALMON, J THOMAS, TR WYATT, C YOUNGMAN, B FOSTER, JC HART, J HARVEY, J PROUDFOOT, DH SAXON, PL WOODWORTH, D HEYLAND, M HOLDER, E DUCHOVNI, Y EISENBERG, U KARSHON, G MIKENBERG, D REVEL, E RONAT, A SHAPIRA, T BARKLOW, T MEYER, G RUDOLPH, H VENKATARAMANIA, E WICKLUND, SL WU, G ZOBERNIG

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