  We argue that recent high energy CERN LHC experiments on transverse momenta
distributions of produced particles provide us new, so far unnoticed and not
fully appreciated, information on the underlying production processes. To this
end we concentrate on the small (but persistent) log-periodic oscillations
decorating the observed $p_T$ spectra and visible in the measured ratios $R =
\sigma_{data}\left( p_T\right)/\sigma_{fit}\left( p_T\right)$. Because such
spectra are described by quasi-power-like formulas characterised by two
parameters: the power index $n$ and scale parameter $T$ (usually identified
with temperature $T$), the observed log-periodic behaviour of the ratios $R$
can originate either from suitable modifications of $n$ or $T$ (or both, but
such a possibility is not discussed). In the first case $n$ becomes a complex
number and this can be related to scale invariance in the system, in the second
the scale parameter $T$ exhibits itself log-periodic oscillations which can be
interpreted as the presence of some kind of sound waves forming in the
collision system during the collision process, the wave number of which has a
so-called self similar solution of the second kind. Because the first case was
already widely discussed we concentrate on the second one and on its possible
experimental consequences.
