  If we find extra dimensions in the second run of the LHC in the $pp$
collisions at $\sqrt{s}$ = 14 TeV, then the string mass scale $M_s$ can be
$\sim$ TeV and we should produce QCD jets in $2 \rightarrow 2$ partonic
collisions via string Regge excitations at the LHC. QCD jets can also be
produced from string balls via thermal radiation at Hagedorn temperature. In
this paper we study jet production from string Regge excitations vs string
balls in $pp$ collisions at $\sqrt{s}$ = 14 TeV at LHC and make a comparison
with the standard model QCD jets. We find that high $p_T$ jet production from
string Regge excitations can be larger than that from string balls and from
standard model QCD jets. We also find resonances in the jet production cross
section in string Regge excitation scenario which is absent in the other two
scenarios. Hence TeV scale high $p_T$ jets can be a good signature to study
string Regge excitations in the $pp$ collisions at $\sqrt{s}$ = 14 TeV at the
LHC.
