arXiv subjects

N. K. Pak

Publications and source records attributed to N. K. Pak.

21 records · Page 2Linked to original sources

arXiv1995

Single Leptoquark Production at TeV Energy $γp$ Colliders

The resolved and direct photon contributions to the single leptoquark (L) production process $γp\rightarrow L e$ are analysed for both scalar (S) and vector (V) leptoquarks in detail. It is shown that resolved photon contribution dominates for $M_{L}\leq 300 GeV$. For $M_{V}\geq 1 TeV$ and $M_{S}\geq 0.5 TeV$ cross section is completely determined by the direct photon conribution. The vector leptoquarks are discussed for both gauge- and non-gauge cases seperately.

hep-ph↗

arXiv1995

Radiative $B^{}\to Bγ$ and $D^{}\to Dγ$ decays in light cone QCD sum rules

The radiative decays $ B^{*} (D^{*})\rightarrow B(D) γ$ are investigated in the framework of light cone QCD sum rules. The transition amplitude and decay rates are estimated.It is shown that our results on branching ratios of D meson decays are in good agreement with the existing experimental data.

hep-ph↗

arXiv1995

ON THE HIGHER-LOOP CONTRIBUTIONS TO THE AXIAL ANOMALY

The problem of the higher-loop contributions to the axial anomaly is reexamined by a new method. We demonstrate that these contributions depend on the order of the calculations. If the divergence of the axial current by nonperturbative Fujikawa method is calculated first and then average it over the photon field in the presence of an external photon source, a nonzero contribution is obtained. However perturbative Feynman diagram method has an uncertainty. Depending on the order of the calculations above mentioned or zero results are obtained.

hep-th↗

N. K. Pak

Single Leptoquark Production at TeV Energy $γp$ Colliders

Radiative $B^{*}\to Bγ$ and $D^{*}\to Dγ$ decays in light cone QCD sum rules

ON THE HIGHER-LOOP CONTRIBUTIONS TO THE AXIAL ANOMALY

Radiative $B^{}\to Bγ$ and $D^{}\to Dγ$ decays in light cone QCD sum rules