QCD corrections to decay-lepton polar and azimuthal angular distributions in $e^{+}e^{-}→ t overline{t}$ in the soft-gluon approximation

Pramana

Saurabh D Rindani1¹ 

[1] Theory Group, Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, India$$

关键词: Top quark;    electron–positron annihilation;    QCD corrections.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

QCD corrections to order 𝛼𝑠 in the soft-gluon approximation to angular distributions of decay charged leptons in the process $e^{+}e^{-}→ toverline{t}$, followed by semileptonic decay of 𝑡 or $overline{t}$, are obtained in the $e^{+} e^{-}$ centre-of-mass frame. As compared to distributions in the top rest frame, these have the advantage that they would allow direct comparison with experiment without the need to reconstruct the top rest frame. The results also do not depend on the choice of a spin quantization axis for 𝑡 or $overline{t}$. Analytic expression for the triple distribution in the polar angle of 𝑡 and polar and azimuthal angles of the lepton is obtained. Analytic expression is also derived for the distribution in the charged-lepton polar angle. Numerical values are discussed for $sqrt{s} = 400$, 800 and 1500 GeV.

【 授权许可】

Unknown