Topological charge changing transitions can induce chirality in the quark-gluon plasma by the axial anomaly. We study the equilibrium response of the quark-gluon plasma in such a situation to an external magnetic field. To mimic the effect of the topological charge changing transitions we will introduce a chiral chemical potential. We will show that an electromagnetic current is generated along the magnetic field. This is the chiral magnetic effect. We compute the magnitude of this current as a function of magnetic field, chirality, temperature, and baryon chemical potential.

Chiral magnetic effect

The effects of topological charge change in heavy ion collisions: “Event by event P and CP violation”

We present a preliminary set of updated NLO parton distributions. For the first time we have a quantitative extraction of the strange quark and antiquark distributions and their uncertainties determined from CCFR and NuTeV dimuon cross sections. Additional jet data from HERA and the Tevatron improve our gluon extraction. Lepton asymmetry data and neutrino structure functions improve the flavour separation, particularly constraining the down quark valence distribution.

http://inspirehep.net/record/752235/files/arXiv:0706.0456.pdf

Parton distributions for the LHC

http://cds.cern.ch/record/477870/files/0011241.pdf

Nonlinear gluon evolution in the color glass condensate: I

We complete the construction of the renormalization group equation (RGE) for the Color Glass Condenstate begun in Paper I. This is the equation which governs the evolution with rapidity of the statistical weight function for the color glass field. The coefficients in this equation --- one-loop real and virtual contributions --- are computed explicitly, to all orders in the color glass field. The resulting RGE can be interpreted as the imaginary-time evolution equation, with rapidity as the ``imaginary time'', for a quantum field theory in two spatial dimensions. In the weak field limit it reduces to the BFKL equation. In the general non-linear case, it is equivalent to an equation by Weigert which summarizes in functional form the evolution equations for Wilson line operators previously derived by Balitsky and Kovchegov.

Nonlinear Gluon Evolution in the Color Glass Condensate: II

This paper is mainly devoted to the presentation and discussion of formulas for the cross section of photon diffractive dissociation. The calculations which we present in a very detailed way are based on perturbative QCD. We improve formulas which describe this process in the triple Regge limit where the square of the missing mass ${\mathit{M}}_{\mathit{X}}$ (the invariant mass of the bunch of secondary hadrons) is much larger than \ensuremath{\Vert}${\mathit{Q}}^{2}$\ensuremath{\Vert} and extend the range of validity to the region where ${\mathit{M}}_{\mathit{X}}^{2}$ is of the same order as \ensuremath{\Vert}${\mathit{Q}}^{2}$\ensuremath{\Vert}. We introduce a diffractive dissociation structure function and show that it obeys the Gribov-Lipatov-Altarelli-Parisi evolution equation, but, with an additional inhomogeneous term. The relation to the Pomeron structure function is discussed.

/pdf/photon-diffractive-dissociation-in-deep-inelastic-scattering-2i6aqnwxj2.pdf

Photon diffractive dissociation in deep-inelastic scattering.

We show that eikonal corrections imposed on diffraction dissociation processes calculated in the triple Regge limit produce a radical change in the energy dependence of the predicted cross section. The induced correction is shown to be in general agreement with the recent Fermilab Tevatron experimental data.

Diffractive dissociation and eikonalization in high energy pp and pp̄ collisions

http://cds.cern.ch/record/505638/files/0106248.pdf

Instantons in the Saturation Environment

In this paper we demonstrate that the dense system of partons (gluons) can be produced in dilute-dilute system scattering, using the example of dipole-dipole collisions. This increase in density stems from the intensive gluon cascades that can be described by the enhanced BFKL Pomeron diagrams (Pomeron loops). For the first time we found the analytical solution to the equation for diffraction production in the dipole-dense parton system scattering, using the simplified BFKL kernel. Having this solution as well as the solution to Balitsky- Kovchegov equation we developed technique that allowed us to calculate the total cross section, cross sections for single and double diffractions in the MPSI approximation. Calculating inclusive production and two gluon correlations we see that the dense and strongly correlated system of gluons can be produced at high energy in the dipole-dipole scattering.

Dipole-dipole scattering in CGC/saturation approach at high energy: summing Pomeron loops

We evaluate the nonperturbative contribution to the double-diffractive production of the Higgs boson, which arises due to the QCD scale anomaly if the mass of the Higgs boson, ${M}_{H},$ is smaller than the mass of the top quark, ${M}_{T},$ ${M}_{H}l{M}_{T}.$ The cross section appears to be larger than expected from perturbative calculations; we find ${\ensuremath{\sigma}}_{H}=0.019--0.14$ pb at Fermilab Tevatron energies, and ${\ensuremath{\sigma}}_{H}=0.01--0.27$ pb at the energy of the CERN LHC.

Eugene Levin

Papers

Photon diffractive dissociation in deep-inelastic scattering.

Diffractive dissociation and eikonalization in high energy pp and pp̄ collisions

Instantons in the Saturation Environment

Dipole-dipole scattering in CGC/saturation approach at high energy: summing Pomeron loops

Soft double-diffractive Higgs boson production at hadron colliders