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9 papers · 2 filters
Resonances contribution to two-photon exchange effects and possible large forward-backward asymmetry in
Hai-Qing Zhou, Bing-Song Zou
The resonances () contribution to two-photon exchange (TPE) effects in is calculated in a simple hadronic model. The calculation…
Gauge Invariant Two-Photon-Exchange Contributions in
Hai Qing Zhou
The gauge invariant two-photon exchange (TPE) contributions in are discussed at hadronic level. The contact term is added to keep the full amplitude gau…
Transverse momentum dependent twist-three result for polarized Drell-Yan processes
Zhun Lu, Ivan Schmidt
We study the polarized Drell-Yan processes from the collision of two spin-1/2 hadrons at order 1/Q based on the framework of transverse momentum dependent factorization.We give the…
Azimuthal asymmetries in single polarized proton-proton Drell-Yan processes
Zhun Lu, Bo-Qiang Ma, Jiacai Zhu
We study the azimuthal asymmetries in proton-proton Drell-Yan processes with one incident proton being transversely or longitudinally polarized. We consider particularly the asymme…
The azimuthal asymmetry of unpolarized dilepton production at the -pole
Zhun Lu, Ivan Schmidt
We calculate the Boer-Mulders effect contribution to the azimuthal asymmetry of unpolarized dilepton production near the -pole. Based on the tree-level expression in th…
Hadron loops effect on mass shifts of the charmed and charmed-strange spectra
Zhi-Yong Zhou, Zhiguang Xiao
The hadron loop effect is conjectured to be important in understanding discrepancies between the observed states in experiments and the theoretical expectations of non-relativistic…