Analysis of kappa meson in light cone QCD sum rules

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, Türkiye

Tezin Onay Tarihi: 2011

Öğrenci: GÜLSEN BAYTEMİR

Danışman: OSMAN YILMAZ

Özet:

In the present work some hadronic properties of the scalar κ meson are studied. Using the QCD sum rules approach, which is a nonperturbative method, the mass and the overlap amplitude of this meson are calculated. As well as the mass and the overlap amplitude, κ → K^+π^− decay is also studied. For this decay the coupling constant g_κK^+π^− is obtained using light cone QCD sum rules which is an extension of the QCD sum rules method. Moreover, the coupling constant is calculated using the experimental decay width and it is compared with the value obtained in light cone QCD sum rules approach. The result of the calculation of g_κK^+π^− , the one obtained from light cone QCD sum rules approach, is also applied to acquire the f_0 − σ scalar mixing angle, θs, using the ratio g^2 (κ → K^+π^−)/g^2 (σ → ππ) obtained from experimental decay width. The value of scalar mixing angle is also compared with its experimental results.