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.

pdf/parton-distributions-for-the-lhc-3jcnh64voi.pdf

Parton distributions for the LHC

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”

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

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.

Soft double-diffractive Higgs boson production at hadron colliders

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

An attempt is made to give a consistent description of high energy hadron interactions starting with the physical assumption that only "hard" processes contribute to the Pomeron structure. Using the general properties of a "hard" Pomeron in perturbative QCD an equation for shadowing corrections is suggested and solved. It allows one to extend the new approach to high energy hadron collisons. In doing so we generalize the so-called eikonal approximation widely used to describe the shadowing corrections for both hadron and nucleus scattering at high energy. New formulas are also suggested for the large rapidity gap survival probability which crucially differ from the eikonal ones.

/pdf/hard-pomeron-approach-to-soft-processes-at-high-energy-2gh3ltwr56.pdf

"Hard" Pomeron approach to "soft" processes at high energy.

In this paper we introduce the confinement into the kernel of the BFKL equation, assuming that the sizes of produced dipoles cannot be large. The goal of this paper is to find how this assumption, which leads to a correct exponential decrease of the amplitude at large impact parameters, affects the main properties of the BFKL Pomeron. We solve the equations for total cross section and 〈|b
 2|〉 numerically and developed some methods of analytical solutions. The main result is that the modified BFKL Pomeron has the same intercept and $ \alpha_{\mathbb{P}}^{\prime }=0 $
 as the BFKL Pomeron. It gives us a hope that the unknown confinement will change only slightly the equations of the CGC/saturation approach.

BFKL Pomeron: modeling confinement

This is the talk given at the Workshop:"Focus on Multiplicitioes", Bari, Italy, 17-19 June,2004.. In this talk, we are going to discuss ion-ion and deuteron - nucleus RHIC data and show that they support, if not more, the idea of the new QCD phase: colour glass condensate with saturated parton density. .

CGC, QCD Saturation and RHIC data (Kharzeev-Levin-McLerran-Nardi point of view)

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