Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2003-04-15
Nucl.Phys. A721 (2003) 926-929
Physics
High Energy Physics
High Energy Physics - Lattice
Talk given at 16th International Conference on Particles and Nuclei (PANIC 02), Osaka, Japan, 30 Sep - 4 Oct 2002
Scientific paper
10.1016/S0375-9474(03)01244-2
The ground-state three-quark (3Q) potential $V_{\rm 3Q}^{\rm g.s.}$ and the excited-state 3Q potential $V_{\rm 3Q}^{\rm e.s.}$ are studied using SU(3) lattice QCD at the quenched level. For more than 300 patterns of the 3Q systems, the ground-state potential $V_{\rm 3Q}^{\rm g.s.}$ is investigated in detail in lattice QCD with $12^3\times 24$ at $\beta=5.7$ and with $16^3\times 32$ at $\beta=5.8, 6.0$. As a result, the ground-state potential $V_{\rm 3Q}^{\rm g.s.}$ is found to be well described with Y-ansatz within the 1%-level deviation. From the comparison with the Q-$\rm\bar Q$ potential, we find the universality of the string tension as $\sigma_{\rm 3Q}\simeq\sigma_{\rm Q\bar Q}$ and the one-gluon-exchange result as $A_{\rm 3Q}\simeq\frac12 A_{\rm Q\bar Q}$. The excited-state potential $V_{\rm 3Q}^{\rm e.s.}$ is also studied in lattice QCD with $16^3\times 32$ at $\beta=5.8$ for 24 patterns of the 3Q systems.The energy gap between $V_{\rm 3Q}^{\rm g.s.}$ and $V_{\rm 3Q}^{\rm e.s.}$, which physically means the gluonic excitation energy, is found to be about 1GeV in the typical hadronic scale, which is relatively large compared with the excitation energy of the quark origin. This large gluonic excitation energy justifies the great success of the simple quark model.
Ichie Hiroko
Matsufuru Hideo
Nemoto Yukio
Suganuma Hideo
Takahashi Tadayuki
No associations
LandOfFree
Behind the success of the quark model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Behind the success of the quark model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Behind the success of the quark model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-477827