  We compute the cross-section of the hadronic jets arising from the quark
antiquark pair which are produced from a hard photons (of 4-momentum $q$) in
the plasma, predominantly consisting of thermalised quarks and gluons. The
quark antiquark pair is hard and scattered off the heat bath to form jets,
while the gluons being soft get thermalised in the heat bath. The infrared
divergences cancel in the observable cross-section to $\alpha_s$ order, which
includes the process of emission and absorption of real gluons. Since the
massless quark antiquark pair is hard the Compton scattering processes are
absent in the heat bath and it renders an uncancelled collinear divergent piece
in the cross-section. We regularize it by eliminating the collinear region from
the phase space and write it in terms of jet parameters. The temperature
dependent part of the jet cross-section is regular at large ${\sqrt{q^2}\over
T}$ and vanishes when ${\sqrt{q^2}\over T}\to \infty$. Since jets carry the
thermal signature of the hot plasma the jet production rate can be used as a
thermometer of the heat bath.
