Angular distributions in dibaryon resonance decays
Langen, Trevor J.
In Chapter 1, a literature review is carried out examining the different aspects of dibaryon resonances. Different reaction channels are investigated for claims substantiating the existence of these structures. These claims, however, can also be explained using conventional NNÏ€ and NÎ” physics without the need for conjecturing internal degrees of freedoms (quarks) found in various bag models. Evidence for the existence of narrow resonant structures is given and compared to theoretical model dependent predictions. Experimental considerations are examined in Chapter 2 such as probe, spectrometer and reaction channel to be used. Various techniques are employed to minimize non-resonant background. A multi-particle Ï€(sterad) detector is described which will be used to measure simultaneous angular distributions on and off the resonance energy. Finally, the physical region accessible to this detector is found. The calculation of angular distributions for a resonant state of different spin-parity is shown in Chapter 3. The calculation is a simplified treatment of the 3-body resonance decay problem in an effort to distinguish among these different angular distributions for a resonance of pure spin-parity state. The angular distribution measurement will substantiate the claim either for the existence of dibaryonic resonances or to the contrary. As well, spin assignment is conceivable, which will act as a stringent test for the conventional and various quark theories. In Chapter 4, the results are shown for both the pion rest frame and lab frame. The sensitivity for separation is found and converted to the number of running hours. Chapter 5, is the conclusion.