Constraints on the $K_{l_{3}}$ form factors from analyticity and unitarity

Pramana

B Ananthanarayan²  Irinel Caprini¹  Gauhar Abbas1²  I Sentitemsu Imsong² 

[1] Horia Hulubei National Institute for Physics and Nuclear Engineering, P.O.B. MG-6, 077125 Magurele, Romania$$;Centre for High Energy Physics, Indian Institute of Science, Bangalore 560 012, India$$

关键词: Unitarity;    analyticity;    zeros.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

The $K 𝜙$ form factors are investigated at low energies by the method of unitarity bounds adapted so as to include information on the phase and modulus along the elastic region of the unitarity cut. Using as input the values of the form factors at 𝑡 = 0, and at the Callan–Treiman point in the scalar case, stringent constraints are obtained on the slope and curvature parameters of the Taylor expansion at the origin.

【 授权许可】

Unknown