Determination of Charm Quark Mass and αs(MZ)\alpha_s(M_Z) from HERA data

Charm production data from HERA can be used to determine the charm quark mass and jet production data from HERA can be used to detrmine $\alpha_s(M_Z)$. recent results are summarised.Comment: 11 pages, 9 figures. Invited talk at the Workshop on the Fundamental Parameters of QCD, NTU, Singapore, March 201

Have we seen anything beyond (N)NLO DGLAP at HERA?

The evidence from HERA for parton saturation, and other low-$x$ effects beyond the conventional DGLAP formalism, is recalled and critically reviewed in the light of new data and analyses presented at the conference.Comment: 4 pages, 5 figures, Contribution to the discussion session at Intenrational Symposium on Multiparticle Dynamics, ISMD08, Hambur

Measurements of αs\alpha_s and parton distribution functions using HERA jet data

Use of HERA jet production cross sections can extend our knowledge of the gluon parton distribution function and yield accurate measurements of $\alpha_s(M_Z)$ in addition to illustrating the running of $\alpha_s$ with scale.Comment: Proceedings of the Ringberg Workshop on `New Trends in HERA Physics 2005

ZEUS NLO QCD fits

NLO QCD fits using the DGLAP formalism have been made to the high precision ZEUS $e^+p$ reduced cross-section data and to fixed target structure function data, in order to detrmine parton distribution functions and the value of $\alpha_s(M^2_Z)$, taking full account of correlated systematic errors. Preliminary results are reported.Comment: 6 pages,6 figures, accepted by Int. Europhysics Conf. on HEP 2001, Budapes

HERA Collider Results

The final results on the combination of all inclusive deep-inelastic scattering cross section data from the H1 and ZEUS experiments at HERA are reviewed. The parton distribution functions (PDFs) extracted from these data (HERAPDF2.0) and from HERA data on heavy flavour production and jet production are also presented (HERAPDF2.0Jets). The use of various heavy flavour schemes is compared and the sensitivity of the data to cuts on Q2 is explored. When jet data are included in the fits, a competitive value of $\alpha_s(M_Z)=0.1184 \pm 0.0016$ is extracted at NLO, excluding scale uncertaintiesComment: Plenary talk at the XXIII International Workshop on Deep-Inelastic Scattering, 27th April-1st May 2015, Dallas, Texas. 14 pages, 18 figures. Based on the analysis of the H1 and ZEUS collaboration

Geometric scaling in ultrahigh energy neutrinos and nonlinear perturbative QCD

The ultrahigh energy neutrino cross section is a crucial ingredient in the calculation of the event rate in high energy neutrino telescopes. Currently there are several approaches which predict different behaviors for its magnitude for ultrahigh energies. In this contribution is presented a summary of current predictions based on the non-linear QCD evolution equations, the so-called perturbative saturation physics. In particular, predictions are shown based on the parton saturation approaches and the consequences of geometric scaling property at high energies are discussed. The scaling property allows an analytical computation of the neutrino scattering on nucleon/nucleus at high energies, providing a theoretical parameterization.Comment: 6 pages, one figure. Presented at First Caribbean Symposium on Nuclear and Astroparticle Physics - STARS2011, La Habana, Cuba, 2011. arXiv admin note: substantial text overlap with arXiv:1011.2718 by different author