Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-09-23
Phys.Rev.D82:086011,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
A modification of the boundary condition is proposed to eliminate the unphysical "pion" mode. Version to appear in Physical Re
Scientific paper
10.1103/PhysRevD.82.086011
I propose to change the sign of the dilaton in the infrared~(IR) soft-wall AdS/QCD model, in order to implement confinement. The deformed model exhibits interesting properties, especially in describing chiral symmetry breaking. The expectation value of the scalar field $X$, which determines the quark mass and condensate, approaches a constant in the IR limit, rather than blows up in the original model. In contrast to the estimate in Ref. \cite{Shifman:2007xn}, this kind of solution will not lead to chiral symmetry restoration for highly-excited states, due to the property of the harmonic-oscillator equation. Instead, it will guarantee the Regge behavior of the axial meson spectrum, and also the pseudoscalar mesons. The value of the condensate can be fixed by requiring that the pion be massless in the chiral limit, but only under some approximation in the present model. We also find that, by relaxing the IR boundary conditions, the unphysical massless state in the vector channel can be eliminated.
No associations
LandOfFree
Improved soft-wall model with a negative dilaton 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 Improved soft-wall model with a negative dilaton, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Improved soft-wall model with a negative dilaton will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-182163