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Using SU(3) lattice QCD, we perform the first systematic study for theground-state three-quark (3Q) potential $V_{\rm 3Q}^{\rm g.s.}$ and the 1stexcited-state 3Q potential $V_{\rm 3Q}^{\rm e.s.}$, {\it i.e.}, the energies ofthe ground state and the 1st excited state of the gluon field in the presenceof the static three quarks. From the accurate and thorough calculation for morethan 300 different patterns of 3Q systems, the static ground-state 3Q potential$V_{\rm 3Q}^{\rm g.s.}$ is found to be well described by the Coulomb plusY-type linear potential, {\it i.e.}, Y-Ansatz, within 1%-level deviation. As aclear evidence for Y-Ansatz, Y-type flux-tube formation is actually observed onthe lattice in maximally-Abelian projected QCD. For more than 100 patterns of3Q systems, we calculate the 1st excited-state 3Q potential $V_{\rm 3Q}^{\rme.s.}$ in quenched lattice QCD, and find the gluonic excitation energy $\DeltaE_{\rm 3Q} \equiv V_{\rm 3Q}^{\rm e.s.}-V_{\rm 3Q}^{\rm g.s.}$ to be about 1GeV. This large gluonic-excitation energy is conjectured to ensure the successof the quark model for the low-lying hadrons even without gluonic excitations.Comment: Talk given at International Conference on Color Confinement and  Hadrons in Quantum Chromodynamics - Confinement 2003, RIKEN, Japan, 21-24 Jul  200

Y-TYPE FLUX-TUBE FORMATION AND GLUONIC EXCITATIONS IN BARYONS: FROM QCD TO QUARK MODEL