6 papers · 1 filter
Corrections to quarkonium 1S energy level at O(alpha_S^4 m) from non-instantaneous Coulomb vacuum polarization
Y. Kiyo, Y. Sumino
We calculate O(alpha_S^4 m) and O(alpha_S^4 m log(alpha_S)) corrections to the quarkonium 1S energy level analytically, which have been overlooked in recent studies. These are the…
Top quark mass determination near t\bar{t} threshold at lepton colliders
Y. Kiyo
Future e^+ e^- linear colliders will enable us to determine the top quark mass with high accuracy from the measurement of the 1S peak position of (remnant of) toponium. The estimat…
Rare Decay of K Meson
Y. Kiyo, T. Morozumi, M. Tanimoto
We investigate the rare decay processes of the K mesons, K_{L,S} -> π^0 ν\barν and K^{+} -> π^+ ν\barν in LR model with lepton family number being well conserved. In these processe…
The Small Behavior of in the Resummed Approach
Yuichiro Kiyo, Jiro Kodaira, Hiroshi Tochimura
The double logarithmic terms are important to predict precisely the small behavior of the spin structure function . We numerically analyze the evolutio…
QCD Higher Order Corrections to at Small
Yuichiro Kiyo, Jiro Kodaira, Hiroshi Tochimura
The small behavior of the flavor non-singlet structure function is analysed numerically by taking into account the all-order resummation of terms. We…
Does Leading ln x Resummation Predict the Rise of g_1 at Small x ?
Yuichiro Kiyo, Jiro Kodaira, Hiroshi Tochimura
We numerically analyse the evolution of the flavor non-singlet structure function taking into account the all-order resummation of terms which is expected t…