Professor Amanda Cooper-Sarkar

Abstract:

The coherent production of π+ mesons by charged current neutrino interactions on neon nuclei in BEBC is compared to the predictions of the PCAC hypothesis and the meson dominance model. Good agreement is observed. © 1989 Springer-Verlag.

Abstract:

The production of the meson resonances ρ{variant}(770) (all three charge states), η(550), ω(783) and f2(1270) in {Mathematical expression} Ne and ν Ne charged current interactions is investigated in a bubble chamber experiment with BEBC at CERN. Except for the f2, the main features of resonance production are reasonably well described by the Lund model, although the average resonance multiplicities are overestimated by the model by (67±30)%. The average multiplicities of all resonances, including the f2, are well reproduced by a semiempirical model, whose parameters were determined from hadron interaction data. © 1989 Springer-Verlag.

Abstract:

Backward proton and pion production is studied in ν and {Mathematical expression} charged current interactions in neon. The results are compared with other experiments and theory. The complete backward proton data is compatible with protons produced by reinteractions in the nucleus. However in events with only one proton, muon variables appear correlated to those for the backward proton, as expected by the two-nucleon correlation model. © 1989 Springer-Verlag.

Abstract:

At HERA energies the small x region (x≲10-2) can be explored at Q2 values large enough that leading twist QCD calculations are valid. We show how measurement of the longitudinal structure function, FL(x,Q2), can lead to accurate measurement of the gluon structure function at such small x values. Experimental systematic errors are discussed fully and requirements for the measurement outlined. We conclude that it should be possible to distinguish between the widely varying gluon distributions which are currently allowed. © 1988 Springer-Verlag.