FINDINGS FROM L. GRIGORYAN AND CO-AUTHORS PROVIDE NEW INSIGHTS INTO PHYSICS

Science Letter
January 12, 2010

"In this work I continue the investigation of the space-time evolution
of the hadronization process on the basis of the semi-inclusive deep
inelastic scattering data on nuclei obtained by the HERMES experiment
at the Deutsches Elektronen Synchrotron (DESY)," investigators in
Yerevan, Armenia report (see also Physics).

"Results of previous articles from our group, together with the
analysis performed in this work, show that a ratio of multiplicities
for the nucleus and deuterium (per nucleon), R-M(h), can be presented
in the form of a function of a single variable tau, which has the
physical meaning of the formation time of the hadron. This tau scaling
is a function of two variables: the energy of the virtual photon nu
and the fraction of that energy, z, carried by the final hadron,"
wrote L. Grigoryan and colleagues.

The researchers concluded: "Moreover, R-M(h) can be parametrized in
the form of a linear polynomial a(11)+tau a(12), where the parameters
a(11) and a(12) do not depend on nu and z."

Grigoryan and colleagues published their study in Physical Review C
(Space-time evolution of hadronization in cold nuclear matter.

Physical Review C, 2009;80(5):5209).

For additional information, contact L. Grigoryan, Yerevan Physics
Institute, Yerevan 375036, Armenia.

The publisher of the journal Physical Review C can be contacted
at: American Physical Society, One Physics Ellipse, College Pk,
MD 20740-3844, USA.