On the power divergence in quasi gluon distribution function

Recent perturbative calculation of quasi gluon distribution function at one-loop level shows the existence of extra linear ultraviolet divergences in the cut-off scheme. We employ the auxiliary field approach, and study the renormalization of gluon operators. The non-local gluon operator can mix with new operators under renormalization, and the linear divergences in quasi distribution function can be into the newly introduced operators. After including the mixing, we find the improved quasi gluon distribution functions contain only logarithmic divergences, and thus can be used to extract the gluon distribution in large momentum effective theory.Comment: 18 pages, 10 figures. Published version in JHE

Gluon quasidistribution function at one loop

We study the unpolarized gluon quasidistribution function in the nucleon at one loop level in the large momentum effective theory. For the quark quasidistribution, power law ultraviolet divergences arise in the cut-off scheme and an important observation is that they all are subjected to Wilson lines. However for the gluon quasidistribution function, we first point out that the linear ultraviolet divergences also exist in the real diagram which is not connected to any Wilson line. We then study the one loop corrections to parton distribution functions in both cut-off scheme and dimensional regularization to deal with the ultraviolet divergences. In addition to the ordinary quark and gluon distributions, we also include the quark to gluon and gluon to quark splitting diagrams. The complete one-loop matching factors between the quasi and light cone parton distribution functions are presented in the cut-off scheme. We derive the $P^z$ evolution equation for quasi parton distribution functions, and find that the $P^z$ evolution kernels are identical to the DGLAP evolution kernels.Comment: 26 pages,8 figures;accepted by Eur.Phys.J

Genome-wide analysis of excretory/secretory proteins in Echinococcus multilocularis: insights into functional characteristics of the tapeworm secretome

Venn diagrams of expression levels of ES protein coding genes in different developments. The venn diagrams are displayed for: the genes that have expressions (A), the genes with very high expression levels (B), the genes with high expression levels (C), the genes with medium expression levels (D), the genes with low expression levels (E), and the genes without expressions (F). (PDF 285 kb

KINEMATIC ANALYSIS OF BASKET WITH 5/4 TURN TO HANDSTAND OF SHIXIONG ZHOU ON PARALLEL BARS

The basket with 5/4 turn to handstand on parallel bars is a representative movement of E group; in 1896 it is listed as the Olympic Games project. The parallel bars have been one of the Chinese men's gymnastics advantage projects since 1980s. From 1980 to 2011, China's elite athletes Li Yuejiu, Lou Yun, Li Jing, Huang Liping, Zhang Jingjin, Li Xiaopeng and Yang Wei won more than a dozen times world champion on the parallel bars in the world gymnastics competitions. China's athletes can keep long-term advantage of this project status and competitive strength, in addition to keep pace with the times innovation of difficult moves, there is another important reason is to continuously improve the leading trend of action quality

Analysis of Λ

We analyze the baryonic semilepton decay Λb→Λμ+μ- in the scalar leptoquark models with X(3,2,7/6) and X(3,2,1/6) states, respectively. We also discuss the effects of these two NP models on some physical observables. For some measured observables, like the differential decay width, the longitudinal polarization of the dilepton system, the lepton-side forward-backward asymmetry, and the baryon-side forward-backward asymmetry, we find that the prediction values of SM are consistent with the current data in most q2 ranges, where the prediction values of these two NP models can also keep consistent with the current data with 1σ. However, in some q2 ranges, the prediction values of SM are difficult to meet the current data, but the contributions of these two NP models can meet them or keep close to them. For the double-lepton polarization asymmetries, PLT, PTL, PNN, and PTT are sensitive to the scalar leptoquark model X(3,2,7/6) but not to X(3,2,1/6). However, PLN, PNL, PTN, and PNT are not sensitive to these two NP models