### The Oldboy of QCD: Sum Rules

#### Huseyin Dağ

#### Özyeğin Üniversitesi,İstanbul

**Özet/Abstract:**

Quantum Chromodynamics(QCD) is part of the Standard Model(SM) that describes the interaction of fundamental particles. In QCD, due to the fact that

strong coupling constant islarge at low energies, perturbative approaches do not work. For this reason, non-perturbative approaches have to be used for studying the properties of hadrons. Among several non-perturbative approaches, QCD sum rules is one of the reliable methods which is applied to understand the properties of hadrons and their interactions. In this talk the QCD Sum rules method (QCDSR) will be reviewed. The basic object of QCDSR is the correlator function. First a general derivation for QCD sum rules is discussed using a two point correlator function. Then, three point QCD sum rules is discussed. Finally two examples will be presented as an application of QCDSR method.

In the first example, the mixing angle between axial vector meson states K1(1270) and K1(1400) is estimated by using sum rules approach. In the second example the charge radii of D and D* mesons are extracted by using QCDSR method.

**Yer :** MSGSÜ Bomonti Binası, Fizik Bölümü.

Tarih : 21 Mart 2013 Perşembe, 15:00

Ayrıntılı bilgi : msgsufizik.net