SUSY Higgs at the LHC:: Large stop mixing effects and associated production

We revisit the effect of the large stop mixing on the decay and production of the lightest SUSY Higgs at the LHC, We stress that whenever the inclusive two-photon signature is substantially reduced, associated production, Wh and <(tt)over bar>h, with the subsequent decay of the Higgs into photons is enhanced and becomes an even more important discovery channel. We also point out that these reductions in the inclusive channel do not occur for the smallest Higgs masses where the significance is known to be lowest. We show that in such scenarios the Higgs can be produced in the decay of the heaviest stop, For not too heavy masses of the pseudo-scalar Higgs where the inclusive channel is even further reduced, we show that large stop mixing also allows the production of the pseudo-scalar Higgs through stop decays, These large mixing scenarios therefore offer much better prospects than previously thought. As a by-product we have recalculated (t) over tilde(1)(t) over tilde(1)* h production at the LHC and give a first evaluation of the (t) over tilde(1)(t) over tilde(1)* Z, (C) 2000 Elsevier Science B.V. All rights reserved.