This page presents (in an incoherent fashion) the scientific
programme of the research unit.
We started as part of the DESY group F34 working on photoproduction of
neutral pions using a novel multielement lead glass counter. In
collaboration with F32 a first measurement of inclusive
electroproduction of neutral pions was performed including an early
test of the quark-parton model.
Electroproduction of neutral pions and test of the quark-parton
model. (Physics Letters B70, 471,
1977) pdf-file
In 1977 we joined the PLUTO
experiment at the DESY electron positron storage ring DORIS. We
contributed a bit to the central paper
Observation of a narrow resonance in e+e-
annihilation at 9.46 GeV. (Physics
Letters B76, 243, 1978) pdf-file
We were much involved (thesis W.
Wagner) in the analysis of τ-lepton decay:
Spin parity analysis of the decay τ -->ν ρ π (Zeitschrift f. Physik C3, 193, 1980)
pdf-file
PLUTO was selected as one of the four
first round experiments at the new DESY electron positron storage ring
PETRA. I had the honor to present the PLUTO results on the discovery of the gluon at
the 1979 Electron Photon Conference (Fermilab, Chicago).
We designed and (partially) constructed two forward spectrometers for
the PLUTO at PETRA project. Using this instrument the focus of our
research were the so called two photon reactions. Some pioneering
results were achieved, e.g. the first measurement of inclusive hadron
production in gamma gamma interactions:
Hadron Production from photon-photon interactions in the cm
energy rang e from 1 to 5 GeV. (Physics Letters B89, 120, 1979) pdf-file
First measurement of the two photon
decay width of the tensor meson f2(1270):
Lepton and hadron pair production in two-photon
recations.(Physics Letters B94, 254,
1980) pdf-file
First measurement of inclusive hadron
production in electron photon scattering:
Inelastic electron photon scattering at moderate four momentum
transfers. (Physics Letters B99,
287,1981) pdf-file
First measurement of the photon
structure function:
First measurement of the photon structure function
F2. (Physics Letters
B107, 168, 1981) pdf-file
Measurement and QCD analysis of the
photon structure function (first paper represents the thesis of A.
Deuter):
Measurement of the photon structure function
F2(x,Q2). (Physics Letters B142, 111, 1984) pdf-file
Measurement and QCD analysis of the photon structure function
F2(x,Q2). (Nuclear Physics B281, 365, 1987) pdf-file
After the forced end of PLUTO at
Petra we left DESY for a while and joined the Fréjus experiment which was designed for a
meaurement of the proton lifetime. We were partly responsible for the
central paper
Lifetime limits on (B-L)-violating nucleon decay and di-nucleon
decay modes from the Frejus Experiment. (Physics Letters B269, 227, 1991) pdf-file
In addition we studied neutrino
oscillations. Our analysis led to much improved limits but for a
positve result the detector was too small.
A study of atmospheric neutrino oscillations in the Frejus
Experiment. (Physics Letters B245,
305, 1990) pdf-file
We did not sign the much later
negative paper Z. Phys. C66, 417
(1995).
We then belonged to the founding
groups of the H1 experiment at the DESY electron proton storage ring
HERA. Our group designed and built the readout electronics for the muon
detector and in addition the muon trigger. Our contributions to H1 are
discussed in two reports (german language): Vortrag von Sascha Caron im Seminar des I. Physikalischen
Instituts am16. Mai 2003
(Aachen I bei H1, ein
Resumée?), Bericht an das
BMBF vom Mai 2003.
A typical example of an analysis performed in
our group is (thesis R. Nisius):
Determination of the strong coupling constant from jet rates in
deep inelastic scattering. (Physics
Letters B346, 415, 1995) pdf-file
or more recently (thesis J. Scheins):
Search for new physics in eq contact interactions at HERA
(Physics Letters B568, 35, 2003)
pdf-file
Some time after my retirement I started a
scientific collaboration with Lalit Sehgal. Our interest in neutrino
reactions led to the follwing publications:
Lepton mass effects in single pion production by
neutrinos.(Physical Review D76,
113004, 2007) pdf-file
Partially conserved axial vector current and coherent pion
production by low energy neutrinos. (Physical Review D79, 059003,
2009) pdf-file
PCAC and coherent pion production by neutrinos. (arXiv:0908.2758, talk presented at NUINT09) pdf-file
In addition we discussed CP violation in heavy (and not so
heavy) quark systems:
CP violation and arrows of time: Evolution of a neutral K or B
meson from an incoherent to a coherent state.(Physical Review D76, 036003, 2007) pdf-file
Upper limit on CP violation in the B0 -
(anti) B0 system. (Physical
Review D83, 037901, 2011) pdf-file
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