Yachao Qian

Single spin asymmetry through QCD instantons

We revisit the effects of QCD instantons in semi-inclusive deep inelastic scattering (SIDIS). We show that large single spin asymmetry (SSA) effects can be induced in longitudinally and transversely polarized proton targets. The results are in agreement with most of the reported data for pion and kaon production. The same effects are found to be important in polarized proton on proton scattering for both charged and chargeless pion productions. The results agree with the reported data in a wide range of \sqrt{s} = 19.4-200 GeV. We predict the SSA for \pi^\pm production in p_\uparrow p in the collider range of \sqrt{s} = 62.4-500 GeV. The backward \pi^{\pm} and \pi^0 productions for the SSA in p_\uparrow p collisions are predicted to coincide at large \sqrt{s}.

Stretched string with self-interaction at the Hagedorn point: Spatial sizes and black holes

We analyze the length, mass and spatial distribution of a discretized transverse string in

Spin Physics through QCD Instantons

{D}_{\ensuremath{\perp}}

Stringy (holographic) Pomeron with extrinsic curvature

dimensions with fixed end points near its Hagedorn temperature. We suggest that such a string may dominate the (holographic) Pomeron kinematics for dipole-dipole scattering at intermediate and small impact parameters. Attractive self-string interactions cause the transverse string size to contract away from its diffusive size, a mechanism reminiscent of the string-black hole transmutation. The string shows sizable asymmetries in the transverse plane that translate to primordial azimuthal asymmetries in the stringy particle production in the Pomeron kinematics for current pp and pA collisions at collider energies.

Double spin asymmetries through QCD instantons

We review some aspects of spin physics where QCD instantons play an important role. In particular, their large contributions in semi-inclusive deep-inelastic scattering and polarized proton on proton scattering. We also review their possible contribution in the

Stretched string with self-interaction at high resolution: Spatial sizes and saturation

\mathcal{P}

P-odd pion azimuthal charge correlations in heavy ion collisions

-odd pion azimuthal charge correlations in peripheral

Erratum: Single spin asymmetry through QCD instantons [Phys. Rev. D86, 014033 (2012)]

AA

Stringy Pomeron: Entropy and Shear Viscosity

scattering at collider energies.

Holographic Pomeron and Primordial Viscosity

We model the soft pomeron in QCD using a scalar Polyakov string with extrinsic curvature in the bottom-up approach of holographic QCD. The overall dipole-dipole scattering amplitude in the soft pomeron kinematics is shown to be sensitive to the extrinsic curvature of the string for finite momentum transfer. The characteristics of the diffractive peak in the differential elastic