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Measurement of Leading Baryon Production at HERA and its Interpretation
in Terms of Colour Singlet Exchange
H1 Collaboration, abstract, submitted to the 29TH Inyernational
Conference on High Energy Physics, ICHEP'98, Vancouver, Canada, July 1998
Abstract: Deep-inelastic scattering events with a leading baryon
have been detected by the H1 experiment at HERA using a forward proton
spectrometer and a forward neutron calorimeter. Semi-inclusive cross sections
have been measured in the kinematic region 
, 
and baryon 
, for events with
a final-state proton with energy 
,
or a neutron with energy 
.
The measurements are used to test production models and factorization hypotheses.
A model of leading baryon production which consits of pion, pomeron and
secondary reggeon exchanges gives a good description of both semi-inclusive
cross sections in the region 
,
where 
is the proton beam energy.
The model is used to constrain the pion structure function.
569-jansen-paper,
(816 kB)
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Observation of Deep Inelastic ep Scattering with a Leading Proton
Benno List, H1 Collaboration
Abstract: The H1 detector at HERA, upgraded with a forward proton
spectrometer, has been used to measure the cross section for deep inelastic
scattering in the kinematic range 
and 
with a leading proton in the
energy range 
. This class of events
is described by a structure function 
very similar to the one for the diffractive ep scattering. The shape of
is well described by models based on meson exchange.
writeup 1997
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The Forward Proton Spectrometer of H1
H1 Collaboration, paper, submitted to the 28th International Conference
on High Energy Physics, ICHEP'96, Warsaw, Poland, July 1996
Abstract: Since 1995 the H1 experiment at HERA is operating a
forward proton spectrometer employing the HERA machine magnets adjacent
to the interaction zone as spectrometer magnets. Scattered protons are
detectec in two stations 81 m and 90 m behind the interaction point with
scintillating fiber hodoscopes. The experimental set up, the perfomance
of the spectrometer and the technique to reconstruct proton momenta are
described. A typical momentum resolution of 4 GeV at 650 GeV has been achieved
with a scale uncertainty estimated to be 3%. All numbers represented in
this paper are preliminary.
pa17-025,
(250 kB)
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Upgrade of the H1 Forward Proton Spectrometer, December 15th 1995
Brussels, DESY-HH, Kiel, Lancaster, Lebedev, Marseille, Prague,
Rome, DESY Zeuthen
Abstract: The data taken in 1995 with the H1 forward proton spectrometer
show that it performs as anticipated in the technical proposal. It is proposed
to upgrade the FPS by adding two new stations, which approach the circulating
beam horizontally at 63 m and 80 m from the interaction point. Furthermore
it is proposed to improve the spatial resolution of the present set up
by adding Silicon-pixel detectors.
H1-12/95-467,
PRC 96/01, (1,0 MB)
-
Status Report for the Forward Proton Spectrometer of H1
Brussels, DESY , Kiel, Lancaster, Lebedev, Rome, DESY Zeuthen
Abstract: First data taken in August 1995 with the H1 forward
proton spectrometer show that it performs as anticipated in the technical
proposal. Compatebility tests with the wire targets of HERA-B are not yet
conclusively because the design rates for HERA-B were not yet reached.
It is proposed to upgrade the FPS by adding two new stations, which
approach the circulating beam horizontally at 63 m and 80 m from the interaction
point.
H1-08/95-451,
PRC 95/03, (0,3 MB)
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Test of a 10 x 10 Channel Photomultiplier Based on Micro-Channel Plates
for Scintillating Fiber Readout
J. Bähr, K. Hiller, B. Hoffmann, H. Lüdecke, A. Menchikov,
R. Nahnhauer, M. Pohl, H.E. Roloff, DESY, IfH Zeuthen; M.N. Kapishin, V.D.
Kekelidze, D.A. Kirillov, A.N. Morozov, A.K. Odishvili, V.A. Sashin, V.N.
Spaskov, Joint Institute of Nuclear Research, Dubna
Abstract: A 100-channel position-sensitive photomultiplier based
on two micro-channel plates has been teted as a readout device for scintillating
fibers. The sensitivity of all channels, the cross talk, the frequency
dependence, and the long time behaviour have been studied using light emitting
diodes. Exposing a scintillating fiber detector to cosmic particles and
beam dump muons the detections efficiency and the spatial resolution have
been measured.
DESY-Zeuthen 95-01, 3/1995
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Beam Tests of Prototype Fiber Detectors for the H1 Forward Proton Spectrometer
J. Bähr, K. Hiller, B. Hoffmann, H. Lüdecke, A. Menchikov,
R. Nahnhauer, H.E. Roloff, F. Tonisch, R. Völkert, DESY, DESY Zeuthen
Abstract: Different prototypes of fiber detectors with an internal
trigger system were tested in a 5 GeV electron beam at DESY. A silicon
microstrip telescope was used for an external reference measurement of
the beam to study the spatial resolution of the fiber detectors. On average
75% of all crossing electron tracks could be reconstructed with a precision
better than 150 µm. These succesful methodical investigations led
to the installation of similar detectors in the proton beamline 81 m downstream
of the central H1-detectoer at HERA as part of a forward proton spectrometer
in spring 1994.
DESY 94-130, 07/1994, ISSN 0418-9833
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Monte Carlo Studies of Efficiency and Resolution of Scintillating Fiber
Detectors for the H1 Forward Proton Spectrometer
B. Chen, A.B. Fahr, F. Niebergall/ Hamburg II, T. Bodentien/Kiel
Abstract: We compare different configurations of scintillating
fiber detectors of the H1 Forward Proton Spectrometer. We investigate the
effects of optical multiplexing, staggering of several layers, and electronic
threshholds on the efficiency and resolution of the detector.
H1-10/94-387,
PRC
94/10, (80 kB)
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High Precision Particle Tracking with a Fiber Detector at the HERA ep-Collider
J. Bähr, K. Hiller, B. Hoffmann, H. Lüdecke, A. Menchikov,
R. Nahnhauer, M. Pohl, H.E. Roloff, R. Völkert, DESY, DESY Zeuthen
Contribution to the Workshop on Scintillating Fiber Detectors-SCIFI93,
Notre Dame, 1993
DESY 93-200, 12/1993, ISSN 0418-9833
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Erste Meßerfahrungen mit den horizontalen Stationen des Vorwärts-Proton-Spektrometers
bei H1
R. Casties, II. Inst. Exp. Physik Univ. Hamburg, Diplomarbeit
3/1998 in German (480 kB)
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Tiefunelastische ep-Streuung bei HERA unter Nachweis eines vorwärts
gestreuten Protons
B. List, II. Inst. Exp. Physik Univ. Hamburg, Dissertation 7/97
h1th-085
,
in German, (1.8 MB)
-
Photoproduktion bei HERA unter Nachweis eines gestreuten Protons im
H1-Vorwärtsprotonspektrometer
C. Wittek, II. Inst. Exp. Physik Univ. Hamburg, Dissertation 97
h1th-101,
in German, (2.0 MB)
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Untersuchungen an einem Spurdetektor aus szintillierenden Fasern und
positionsempfindlichem Photomultiplier
A. B. Fahr, II. Inst. Exp. Physik Univ. Hamburg, Diplomarbeit
7/1995 in German (html file)
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Untersuchungen am Prototypen des H1-Vorwärtsprotonspektrometers
mit dem Triggerszintillatorsystem
T. Wilksen, II. Inst. Exp. Physik Univ. Hamburg, Diplomarbeit
3/1995 in German (15 MB)
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Untersuchung eines positionsempfindlichen Photomultipliers mit dem Schwerpunkt
Programmentwicklung für die Datenauslese
C. Wittek, II. Inst. Exp. Physik Univ. Hamburg, Diplomarbeit
4/1994 in German (852 kB)
