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∆-resonance ( or P 33 (1232) ) The most prominent peak seen in ep scattering at low Q 2 (J=3/2, I=3/2). At the Constituent Quark Models (CQM) predict: At perturbative Quantum Chromodynamics (pQCD) predicts: A transition to the asymptotic regime is expected at some intermediate value of Q 2 . No Transition to the asymptotic regime have been seen yet Data at low Q 2 favor models incorporating pion cloud.
S 11 (1535) and P 11 (1440) states The A1/2 amplitude of S11 (1535) indicates very slow Q2 fall-off not explained by CQM. CLAS measured both in πN and ηN decay channels. The results from the two channels agree. Roper resonance ( or P11 (1440) ) has lower mass than one naturally would expect from CQM. It was suggested that P11 (1440) can also be a hybrid state |Q3G>, a hard core surrounded by a vector meson cloud, or even a pentaquark. We still need more Q 2 points for A 1/2 to understand the nature of the Roper resonance.
Page 1 and 2: Monitoring of the Beam Time-Structu
Page 3 and 4: CLAS Detector in Hall B Nearly 4π
Page 5 and 6: Terminology for ep Scattering 4-mo
Page 7: Form Factors 4-D analogue of Fouri
Page 11 and 12: Using the RF structure for PID The
Page 13 and 14: The “Sixty Hz” Application Uti
Page 15 and 16: Schematic of the System Beam bunche
Page 17 and 18: Detectors Used for the Study “Be
Page 19 and 20: Some Data Processing For some chan
Page 21 and 22: The phase of 499 MHz component We
Page 23: Conclusions Charged particle ID is

slides - CASA - Jefferson Lab

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