Summary on Theoretical Aspects

During the five days of this conference a very dense scientific program has enlighted our research fields, with the presentation of large number of interesting lectures. I will try to summarize the theoretical aspects of some of these new results.Comment: 7 pages,Invited talk at the "13th Blois Workshop", CERN, Geneva, June 29 - July 3, 2009 To be published in the DESY Proceeding

Recent Progress in the Statistical Approach of Parton Distributions

We recall the physical features of the parton distributions in the quantum statistical approach of the nucleon. Some predictions from a next-to-leading order QCD analysis are compared to recent experimental results. We also consider their extension to include their transverse momentum dependence.Comment: 6 pages, 3 figures, Invited talk at DIFFRACTION 2010, Otranto, Italy, September 10 - 15, 2010, to appear in the AIP Conference Proceeding

Do we understand elastic scattering up to LHC energies?

The measurements of high energy \bar p p and pp elastic at ISR, SPS and Tevatron colliders have provided usefull informations on the behavior of the scattering amplitude. A large step in energy domain is accomplished with the LHC collider presently running, giving a unique opportunity to improve our knowledge on the asymptotic regime of the elastic scattering amplitude and to verify the validity of our theoretical approach, to describe the total cross section \sigma_{tot}(s), the total elastic cross section \sigma_{el}(s), the ratio of the real to imaginary parts of the forward amplitude \rho(s) and the differential cross section d\sigma (s,t)/dt.Comment: 6 pages, 2 figures, Invited talk at " DIFFRACTION 2012"', Puerto del Carmen, Lanzarote Canary Islands (Spain), September 10-15 2012, to appear in AIP Conference Proceedings (2013

Recent results in the Statistical Approach of Polarized PDF and Extension to Baryon Fragmentation Functions

Parton distributions are constructed in a statistical physical picture of the nucleon. The chiral properties of QCD lead to strong relations between quarks and antiquarks distributions and the importance of the Pauli exclusion principle is also emphasized. A global next-to-leading order QCD analysis of unpolarized and polarized deep-inelastic scattering data is performed to determine a small number of free parameters. Some predictions are compared to recent experimental results. We also present an extension of the statistical approach to the description of baryon fragmentation functions.Comment: 5 pages, 3 figures, talk presented at DIS2003, XI Int. Workshop on Deep Inelastic Scattering, St. Petersburg, 23-27 April,200

New Statistical PDFs: Predictions and Tests up to LHC Energies

The quantum statistical parton distributions approach proposed more than one decade ago is revisited by considering a larger set of recent and accurate Deep Inelastic Scattering experimental results. It enables us to improve the description of the data by means of a new determination of the parton distributions. This global next-to-leading order QCD analysis leads to a good description of several structure functions, involving unpolarized parton distributions and helicity distributions, in a broad range of $x$ and $Q^2$ and in terms of a rather small number of free parameters. There are several challenging issues, in particular the behavior of $\bar d(x) / \bar u(x)$ at large $x$, a possible large positive gluon helicity distribution, etc.. The predictions of this theoretical approach will be tested for single-jet production and charge asymmetry in $W^{\pm}$ production in $\bar p p$ and $p p$ collisions up to LHC energies, using recent data and also for forthcoming experimental results.Comment: 4 pages, 3 figures, Invited talk at Diffraction 2016, Acireale, Sicily (Italy), Sept. 2 - 8 (2016), to be published in the AIP Conference Proceedings. arXiv admin note: substantial text overlap with arXiv:1510.0618

A new search strategy for the Higgs boson

We propose a novel mechanism for exclusive diffractive Higgs production $pp \to Hpp$, in which the Higgs carries a significant fraction of the projectile proton's momentum. This mechanism will then provide a clear experimental signal for Higgs production, due to the small background in this kinematic region. The key assumption underlying our analysis is the presence of intrinsic charm (IC) and intrinsic bottom (IB) fluctuations in the proton bound state, whose existence, at high light-cone momentum fraction $x$, has a substantial and growing experimental and theoretical support.Comment: 4 pages, 1 figure, Talk presented at the International Conference on QCD and Hadronic Physics, Beijing, June 16-20 (2005