Quark Mass Deformation of Holographic Massless QCD
نویسندگان
چکیده
We propose several quark mass deformations of the holographic model of massless QCD using the D4/D8/D8-brane configuration proposed by Sakai and Sugimoto. The deformations are based on introducing additional D4or D6-branes away from the QCD D4 branes. The idea is similar to extended technicolor theories, where the chiral symmetry breaking by additional D-branes is mediated to QCD to induce non-zero quark masses. In the D-brane picture as well as the holographic dual gravity description, the quark and the pion masses are generated by novel worldsheet instantons with finite area. We also derive the Gell-Mann-Oakes-Renner relation, and find the value of the chiral condensate in the Sakai-Sugimoto model. e-mail: [email protected] e-mail: [email protected] e-mail: [email protected] e-mail: [email protected]
منابع مشابه
One loop calculation in lattice QCD with domain - wall quarks
One loop corrections to the domain-wall quark propagator are calculated in massless QCD. It is shown that no additative counter term to the current quark mass is generated in this theory, and the wave function renormalization factor of the massless quark is explicitly evaluated. We also show that an analysis with a simple mean-field approximation can explain properties of the massless quark in ...
متن کاملواپاشیهای پنگوئن درکوارک b
In this research, we are going to study the QCD penguin structure and calculate the second order approximation. The amplitude of decays related to QCD penguin in the quark model up to the first and second orders were calculated. We calculated the amplitude of QCD penguin on lowest order of αs for the first order of the decay processes b→qkg→qkqiqj and for the second order of the decay processes...
متن کاملHeaviside Transform with Respect to the Mass in Qcd
We propose the use of Heaviside transform with respect to the quark mass to investigate dynamical aspects of QCD. We show that at large momentum transfer the transformed propagator of massive quarks behaves softly and thus the dominant effect of explicit chiral symmetry breaking disappears through Heaviside transform. This suggests that the massless approximation would be more convenient to do ...
متن کاملIs the Up Quark Massless?
The symmetries of QCD allow for a CP breaking term in the QCD Lagrangian. However, measurements of the neutron dipole moment have demonstrated that the coefficient of this term is very small, if not zero. The unnatural smallness of this coefficient is known as the strong CP problem. A massless up quark has long been proposed as a potential elegant solution to the problem. Without the up quark m...
متن کاملThe role of electroweak penguin and magnetic dipole QCD penguin on hadronic b Quark Decays
This research, works with the effective Hamiltonian and the quark model. Using, the decay rates of matter-antimatter of b quark was investigated. We described the effective Hamiltonian theory which was applied to the calculation of current-current (Q1,2), QCD penguin (Q3,…,6), magnetic dipole (Q8) and electroweak penguin (Q7,…,10) decay rates. The gluonic penguin structure of hadronic decays ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2008