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The Structure of Pentaquark States

Author: BaiLiHui
Tutor: DaiLianRong
School: Liaoning Normal University
Course: Theoretical Physics
Keywords: Quark model Pentaquark Positive -parity states Negative parity states
CLC: O572.33
Type: Master's thesis
Year: 2009
Downloads: 4
Quote: 0
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Abstract


1997 , Diakonov other person under chiral soliton model predicts that there may be pentaquark (Θ ~ particles ) , it has a low mass and narrow width .2003 year , Japan's LEPS experiment experimental group claims found on this Θ ~ particle the existence of a mass of 1540MeV, quark structure uudds. later, five -quark states in high-energy physics research to become the hottest research topics have positive results , there are no experimental results so far, the international community this problem is still not a final conclusion. Based on the Nambu-Jona-Lasinio (NJL) model parameters given , to further study the Θ ~ particle energy . Firstly, group theory method to construct a positive -parity states (J ~ π = 1/2 ~) and negative parity states (J ~ π = 1/2 ~ -) wave function and then , using the NJL model parameters further investigated pentaquark energy , qualitative analysis of the radial wave function of the width and multi- Gaussian expansion for five quark state energy impact , while also analyzed the different forms of confinement potential and annihilation effect, and the scalar meson mixing angle and meson truncation quality on pentaquark energy results showed , positive-parity states of energy than the negative -parity states of the energy is high, and isospin lowest energy at T = 0 this is still higher than the lowest energy configuration gives the experimental values ??of the Japanese LEPS height of about 180MeV, difficult to obtain Θ ~ particles in low quality. this conclusions and give negative results of experiments are consistent .

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CLC: > Mathematical sciences and chemical > Physics > Nuclear physics,high energy physics > High-energy physics > Particle types > Meson
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