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Title: Multiplicity distribution in particle physics
Keywords: Multiplicity distribution, Lee-Yang zeros
Issue Date: 8-Apr-2008
Citation: ANDREAS DEWANTO (2008-04-08). Multiplicity distribution in particle physics. ScholarBank@NUS Repository.
Abstract: Among the results studied in high-energy multiparticle production, the presence of "shoulder" structure in the multiplicty distributions and the oscillatory behaviour of the multiplicity moments are the most elusive. As up to this moment, there is yet a satisfying theoretical work that is able to reproduce these phenomena from first-principle quantum chromodynamics (QCD) despite its success in predicting the existence of quark, gluon and some of their dynamics. Thus, one has to start using phenomenological approach in trying to describe the multiplicity data with a particular distribution function. In late 1980s, Chew et al introduced Generalized Multiplicity Distribution (GMD) to describe multiplicity data at TASSO and SPS energies. In this work, we apply GMD to study comprehensively all available electron-positron (electron-positron) and hadron-hadron (proton-proton and proton-antiproton from various collaborations. We also apply Lee-Yang theory of phase transition to multiplicity data using GMD and find the correlation between Lee-Yang zeros, multiplicity distribution and multiplicity moments qualitatively at different energy range. It turns out that the development of "shoulder" structures in multiplicity data are accompanied by the development of "ear"-like structures in Lee-Yang zero plots, which further indicates an ongoing phase transition from soft to semihard scattering as energy increases. Meanwhile, the oscillating multiplicity moments distinguish electron-positron collisions from hadron-hadron collisions.
Appears in Collections:Master's Theses (Open)

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