Search for QCDinstantoninduced effects in deep inelastic electron proton scattering at HE.pdfVIP
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Search for QCDinstantoninduced effects in deep inelastic electron proton scattering at HE
Search for QCD-instanton-induced effects in deep
inelastic electron proton scattering at HERA∗
Gerd W. Buschhorn
Max-Planck-Institut f¨ur Physik
0 (Werner-Heisenberg-Institut)
0 80805 M¨unchen, Germany
0
2
p 1 Introduction
e
S
6 QCD, in contrast to QED, is not exhausted by perturbation theory. While
1 QCD perturbation theory appears to be very successful at higher momentum
v transfers where the strong coupling constant becomes small, some of the
4 most fundamental properties of hadronic physics like color confinement and
6
0 hadronization of quarks and gluons, characteristic for the low momentum
9 transfer region, are not accessible to perturbative methods.
0
0 QCD is a nonabelian gauge theory. In 1975, Polyakov et al. [1] made the im-
0 portant discovery that such theories in their pure gauge form, i.e. without the
/
h involvement of spontaneous symmetry breaking, have localized classical solu-
p
- tions in Euclidean space-time. Since the objects described by these solutions
p
e are localized in 3+1 dimensions, they describe “events” rather than normal
h particles which are localized in 3 dimensions. Accordingly, they were named
:
v pseudoparticles by Polyakov [1] and instantons by ’t Hooft [2]. The replace-
i
ment of time t by ix (real x ) by going into Euclidean space corresponds
X 4 4
r to the method of calculating tunneling amplitudes in the nonperturbative
a
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