| Abstract |
This paper reports an H1 preliminary analysis of HERA-1 data for
h\ and \ph\
VM diffractive production, both
in the elastic and proton dissociative channel.
The analysed data, which correspond to 51 pb-1, include a total of
12500 events in the transition
region from low Q2 to the perturbative domain, $2.5 < Q2 <
60 GeV2, with data analysed in a
consistent way, in particular for background estimates.
The total, longitudinal and transverse cross sections are measured as a
function of Q2, W and
|t|.
The polarisation efects are discussed in detail, in particular the Q2,
|t| and (for rho mesons) M(pi,pi) dependences of the s-channel helicity conserving and
violating amplitudes and
phases.
A consistent picture of VM production at intermediate and large Q2
thus emerges from H1
HERA-1 measurements, which can be interpreted in a QCD framework. |
