A Classic Thesis Style - Johannes Gutenberg-Universität Mainz

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22 introduction Figure 9: Total cross section for K + Λ photoproduction on the proton. Model predictions with and without the D13(1960) resonance are shown by solid and dashed lines respectively. SAPHIR data are denoted by the solid squares, old data are shown by open circles. Source [49] achieve the final goal of measuring enough photoproduction observables to construct the complete set of four complex amplitudes that define the reaction completely in the next few years. Up to now, CLAS collaboration in experimental Hall B has published photoproduction cross sections with almost full angular coverage (with the important exception of very forward cm kaon angles) at energies up to 2.54 GeV [43]. This data disagreed with the previous SAPHIR results [48], specially in forward and backward regions. An independent analysis of a different CLAS data set obtained for pentaquark searches, but which also provided abundant data for the K + Λ channel, confirmed the previous results. There was also good agreement between CLAS and LEPS [51] measured cross-section at forward angles. A statistical study using four different isobar models [54] showed that SAPHIR data was coherently shifted down with respect to CLAS results. The controversy in this point seems to be settled in favor of CLAS data. Results from CLAS [55] confirmed the earlier measurements of GRAAL [52] and LEPS [50] for hyperon recoil polarization P and beam asymmetry Σ with improved precision and broader energy coverage. Results on beam-recoil observables for linear (Ox,Oz) and circularly polarized photons (Cx,Cz) were also presented in [55] and [56] respectively. This data indicated quite unexpectedly that Λ polarization had a strong tendency to be in the direction of the spin of the incoming photon. The effect of these new data in the isobaric models was a considerable simplification of the corresponding structure function, selecting a few
1.6 previous experiments 23 out of the many possible candidate resonances. Cx and Cz results indicated that the excitation of P13(1900) (instead of D13(1895 MeV)) resonance was apparently necessary to fit the data [57]. The amount of data for electroproduction is substantially smaller. Hall C experiment E93-018 at Jlab performed the first precise Rosenbluth separation of cross-sections into longitudinal and transverse parts [42]. CLAS results for the transfer of longitudinal polarization of the virtual photon to the produced hyperon were also published in [58]. Latest results concern the first measurements of the longitudinaltransverse polarized structure function in electron scattering from an unpolarized target [59]. This data poses a new challenge to the models since strong interference effects have been observed. A1 collaboration has also recently measured this observable (before its completion as a double arm spectrometer) using one of the existing spectrometers for electron detection. This experiment continues the series of measurements at low Q 2 initiated in this thesis.
Page 1: M E A S U R E M E N T O F T H E U N
Page 5: A B S T R A C T The new stage of th
Page 9 and 10: C O N T E N T S i kaon electroprodu
Page 11: Part I K A O N E L E C T R O P R O
Page 14 and 15: 4 introduction Lorentz invariance.
Page 16 and 17: 6 introduction appear in the K + Λ
Page 18 and 19: 8 introduction there was almost no
Page 20 and 21: 10 introduction This allows us to w
Page 22 and 23: 12 introduction K ¡p γ ∗ Λ(Σ
Page 24 and 25: 14 introduction means of the isobar
Page 26 and 27: 16 introduction amount of resonance
Page 28 and 29: 18 introduction photo and electropr
Page 30 and 31: 20 introduction 1.6 previous experi
Page 35 and 36: E X P E R I M E N TA L S E T U P A
Page 37 and 38: 2.3 target 27 Figure 11: Schematic
Page 39 and 40: 2.4 kaos spectrometer 2.4 kaos spec
Page 41 and 42: M MWPC L F 2.4 kaos spectrometer 31
Page 43 and 44: Table 3: Spectrometers properties 2
Page 45 and 46: 2.4 kaos spectrometer 35 Figure 16:
Page 47 and 48: 2.4.5.1 Read out electronics 2.4 ka
Page 49 and 50: 2.4 kaos spectrometer 39 channels.
Page 51 and 52: 2.5 kaos single arm trigger 41 64MB
Page 53 and 54: 2.6 spectrometer b 43 Figure 23: Sc
Page 55 and 56: 2.7 coincidence setting 45 to be im
Page 57 and 58: 2.8 data acquisition and analysis s
Page 59: 2.9 kinematical setting 49 (GeV/c)
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72 detection efficiencies and data
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C O N C L U S I O N S The effort to
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cm [nb/sr] dσ v / dΩ K 1500 1000
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cm [nb/sr] dσ / dΩ K 500 400 300
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Part II F E A S I B I L I T Y S T U
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90 conclusions Figure 55: Emission
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92 prototyping and efficiency measu
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100 prototyping and efficiency meas
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102 prototyping and efficiency meas
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104 noise and radiation damage Figu
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106 noise and radiation damage Prob
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110 noise and radiation damage Figu
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112 noise and radiation damage Puls
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114 noise and radiation damage Tabl
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118 conclusions been tested and fou
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120 theoretical background photopro
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122 theoretical background effect o
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124 theoretical background A physic
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126 theoretical background taken in
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128 theoretical background for the
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130 theoretical background a.8 φ d
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132 theoretical background where σ
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134 theoretical background by showi
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136 theoretical background With thi
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138 bibliography [16] J. C. David,
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140 bibliography [44] M. Bockhorst
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142 bibliography [71] P. Achenbach
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144 bibliography [98] S. Nozawa and
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146 bibliography Figure 24 Spek B d
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Figure 73 Annealing at 80° of the
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A Classic Thesis Style - Johannes Gutenberg-Universität Mainz

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