Polarized parton distributions in perturbative QCD

We review the main results of next-to-leading order QCD analyses of polarized deep-inelastic scattering data, with special attention to the assessment of theoretical uncertainties.Comment: 4 pages Latex, 1 ps figure. Talk given at NUCLEON '99, Frascati(Italy), June 7-9 199

All Order Running Coupling BFKL Evolution from GLAP (and vice-versa)

We present a systematic formalism for the derivation of the kernel of the BFKL equation from that of the GLAP equation and conversely to any given order, with full inclusion of the running of the coupling. The running coupling is treated as an operator, reducing the inclusion of running coupling effects and their factorization to a purely algebraic problem. We show how the GLAP anomalous dimensions which resum large logs of x can be derived from the running-coupling BFKL kernel order by order, thereby obtaining a constructive all-order proof of small x factorization. We check this result by explicitly calculating the running coupling contributions to GLAP anomalous dimensions up to next-to-next-to leading order. We finally derive an explicit expression for BFKL kernels which resum large logs of Q^2 up to next-to-leading order from the corresponding GLAP kernels, thus making possible a consistent collinear improvement of the BFKL equation up to the same order

Status of Neutrino Masses and Mixing in 2009

We present a very concise summary of the status of our knowledge and understanding of neutrino masses and mixing.Comment: 12 pages, 1 figure. Talk given at the Rencontres de Physique de la Vallee d'Aoste, La Thuile, Aosta Valley (Italy). March 1-7, 200

An Overview of Neutrino Mixing

We present a concise review of the recent important experimental developments on neutrino mixing (hints for sterile neutrinos, large $\theta_{13}$, possible non maximal $\theta_{23}$, approaching sensitivity on $\delta_{CP}$) and their implications on models of neutrino mixing. The new data disfavour many models but the surviving ones still span a wide range going from Anarchy (no structure, no symmetry in the lepton sector) to a maximum of symmetry, as for the models based on discrete non-abelian flavour groups.Comment: 6 pages, no figures. Talk given at the Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics, June 2012, Capri, Ital

A Summary from the Theorist's Point of View

1. Introduction - 2. Astrophysics and Cosmology - 3. Neutrino Oscillations - 4. Higgs and New Physics Searches - 5. Flavour Physics and CP Violation - 6. QCD - 7. Heavy Ion Collisions - 8. OutlookComment: 10 pages, Summary talk given at the IVth Rencontres du Vietnam on "Physics at Extreme Energies", Hanoi, July 200

New Physics and the LHC

In these lectures I start by briefly reviewing the status of the electroweak theory, in the Standard Model and beyond. I then discuss the motivation and the possible avenues for new physics, on the brink of the LHC start.Comment: 35 pages, 8 figures. Lectures given at the Lake Louise Winter Institute, Lake Louise, Alberta, Canada, 18-23 February 200

Status of Neutrino Masses and Mixing in 2010

We present a short summary of our present knowledge and understanding of neutrino masses and mixing.Comment: 15 pages, 2 figures. Talk given at the Quarks, Strings and the Cosmos - Hector Rubinstein Memorial Symposium, August 09-11, 2010, AlbaNova, Stockholm, Swede

Concluding talk: fundamental lessons and challenges from neutrinos

We present a concise review of the experimental developments on neutrino mixing and their theoretical implications as presented and discussed at this Conference. The recent data disfavour many models but the surviving ones still span a wide range going from Anarchy (no structure, no symmetry in the neutrino sector) to a maximum of symmetry, as for the models based on discrete non-abelian flavour groups which can be improved following the indications from the recent data.Comment: 20 pages, no figures. Talk given at the Pontecorvo 100 Symposium in honour of Bruno Pontecorvo for the centennial of the birth, Pisa, 18-20 September 2013. arXiv admin note: text overlap with arXiv:1304.5047, arXiv:1111.6421, arXiv:1210.346

Status of the Standard Model at the LHC Start

I present a concise review of where we stand in particle physics today. First, I will discuss QCD, then the electroweak sector and finally the motivations and the avenues for new physics beyond the Standard Model.Comment: Plenary Talk at the 5th Italian Workshop on p-p Physics at the LHC. 13 pages, no figure

NEW PHYSICS AND RECENT HIGH PRECISION ELECTROWEAK MEASUREMENTS

We analyze LEP and SLC data from the 1995 Winter Conferences for signals of new physics. We compare the data with the Standard Model (SM) as well as a number of test hypotheses concerning the nature of new physics: (i) nonstandard Zbb couplings, (ii) nonstandard Zff couplings for the entire third generation, (iii) nonstandard oblique corrections, (iv) nonstandard lepton couplings, (v) general nonstandard W and Z couplings to all fermions, as well as combinations of the above. In most of our analyses, we leave the SM variables $\alpha_s$ and $m_t$ as free parameters to see how the various types of new physics can affect their inferred values. We find that the best fit ($\chi^2/d.o.f. = 8.4/10$) is obtained for the nonstandard Zbb couplings, which also give a `low' value (0.112) for $\alpha_s$. The SM also gives a good description of the Z data, having $\chi^2/d.o.f. = 12.4/12$. If $\alpha_s$ is held fixed to the low-energy value 0.112, then we find that a combination of the nonstandard Zbb couplings is fit to lie more than four standard deviations away from zero.Comment: Plain TeX, 9 pages, one figure (uuencoded), and 8 table