398 research outputs found
Search for Θ+ production in the γd → ΛK+n reaction
The study of the Θ+ production in photoreactions is one of the main topics of the experimental program of the CLAS Collaboration. Among the various possible reaction channels, one of the most interesting one is the reaction γd → ΛK+n, because, having only one kaon in the final state, there are no background contributions from mesonic resonances, and also the number of possible baryonic
resonances are very limited. Here the preliminary results of the data collected in 2004 at CLAS will be shown. The final state is identified by detecting in CLAS the proton and pion coming from the Λ and the kaon, while the neutron is detected via missing mass
Studies of Transverse Momentum Dependent Parton Distributions and Bessel Weighting
In this paper we present a new technique for analysis of transverse momentum
dependent parton distribution functions, based on the Bessel weighting
formalism. The procedure is applied to studies of the double longitudinal spin
asymmetry in semi-inclusive deep inelastic scattering using a new dedicated
Monte Carlo generator which includes quark intrinsic transverse momentum within
the generalized parton model. Using a fully differential cross section for the
process, the effect of four momentum conservation is analyzed using various
input models for transverse momentum distributions and fragmentation functions.
We observe a few percent systematic offset of the Bessel-weighted asymmetry
obtained from Monte Carlo extraction compared to input model calculations,
which is due to the limitations imposed by the energy and momentum conservation
at the given energy/Q2. We find that the Bessel weighting technique provides a
powerful and reliable tool to study the Fourier transform of TMDs with
controlled systematics due to experimental acceptances and resolutions with
different TMD model inputs.Comment: 30 pages, 8 figures, enhanced discussion and interpretation of
results, new section on errors with an appendix, added references. Accepted
for publication in JHE
Complete angular distribution measurements of two-body deuteron photodisintegration between 0.5 GeV and 3 GeV
Nearly complete angular distributions of the two-body deuteron photodisintegration differential cross section have been measured using the CEBAF Large Acceptance Spectrometer detector and the tagged photon beam at the Thomas Jefferson National Accelerator Facility. The data cover photon energies between 0.5 and 3.0GeV and center-of-mass proton scattering angles 10°–160°. The data show a persistent forward-backward angle asymmetry over the explored energy range, and are well described by the nonperturbative quark gluon string model
Investigation of Hamamatsu H8500 phototubes as single photon detectors
We have investigated the response of a significant sample of Hamamatsu H8500
MultiAnode PhotoMultiplier Tubes (MAPMTs) as single photon detectors, in view
of their use in a ring imaging Cherenkov counter for the CLAS12 spectrometer at
the Thomas Jefferson National Accelerator Facility. For this, a laser working
at 407.2nm wavelength was employed. The sample is divided equally into standard
window type, with a spectral response in the visible light region, and
UV-enhanced window type MAPMTs. The studies confirm the suitability of these
MAPMTs for single photon detection in such a Cherenkov imaging application
Polarization observables in high-energy deuteron photodisintegration within the Quark-Gluon Strings Model
Deuteron two-body photodisintegration is analysed within the framework of the
Quark-Gluon Strings Model. The model describes fairly well the recent
experimental data from TJNAF in the few GeV region. Angular distributions at
different -energies are presented and the effect of a forward-backward
asymmetry is discussed. New results from the QGSM for polarization observables
from 1.5 -- 6 GeV are presented and compared with the available data.Comment: 3 pages, LaTeX, 4 postscript figures; contribution to QNP2002,
Juelich, June 10-14, 200
A description of the ratio between electric and magnetic proton form factors by using space-like, time-like data and dispersion relations
We use the available information on the ratio between the electric and
magnetic proton form factors coming from recently published space-like data and
from the few available time-like data. We apply a dispersive procedure on these
data to evaluate the behaviour of this ratio, as a complex function, for all
values of q^2.Comment: 12 pages, 7 Encapsulated Postscript figures, uses epsfig, rotating,
exscale, amsmath, cite, latexsym, graphics, color packages, added reference
Test of the CLAS12 RICH large scale prototype in the direct proximity focusing configuration
A large area ring-imaging Cherenkov detector has been designed to provide
clean hadron identification capability in the momentum range from 3 GeV/c up to
8 GeV/c for the CLAS12 experiments at the upgraded 12 GeV continuous electron
beam accelerator facility of Jefferson Laboratory. The adopted solution
foresees a novel hybrid optics design based on aerogel radiator, composite
mirrors and high-packed and high-segmented photon detectors. Cherenkov light
will either be imaged directly (forward tracks) or after two mirror reflections
(large angle tracks). We report here the results of the tests of a large scale
prototype of the RICH detector performed with the hadron beam of the CERN T9
experimental hall for the direct detection configuration. The tests
demonstrated that the proposed design provides the required pion-to-kaon
rejection factor of 1:500 in the whole momentum range.Comment: 15 pages, 23 figures, to appear on EPJ
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