Author
Guido Altarelli
Other affiliations: École Normale Supérieure, Roma Tre University, Sapienza University of Rome ...read more
Bio: Guido Altarelli is an academic researcher from CERN. The author has contributed to research in topics: Neutrino & Electroweak interaction. The author has an hindex of 58, co-authored 261 publications receiving 18823 citations. Previous affiliations of Guido Altarelli include École Normale Supérieure & Roma Tre University.
Papers published on a yearly basis
Papers
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TL;DR: In this article, the main body of predictions of the theory for deep-inleastic scattering on either unpolarized or polarized targets is re-obtained by a method which only makes use of the simplest tree diagrams and is entirely phrased in parton language with no reference to the conventional operator formalism.
4,692 citations
TL;DR: In this article, the authors review the application of non abelian discrete groups to the theory of neutrino masses and mixing, which is strongly suggested by the agreement of the TriBimaximal (TB) mixing pattern with experiment.
Abstract: We review the application of non abelian discrete groups to the theory of neutrino masses and mixing, which is strongly suggested by the agreement of the TriBimaximal (TB) mixing pattern with experiment. After summarizing the motivation and the formalism, we discuss specific models, based on A4, S4 and other finite groups, and their phenomenological implications, including lepton flavor violating processes, leptogenesis and the extension to quarks. In alternative to TB mixing the application of discrete flavor symmetries to quark-lepton complementarity and Bimaximal Mixing (BM) is also considered.
1,050 citations
TL;DR: In this article, a 4-dimensional SUSY version of an A4 model for tribimaximal neutrino mixing is presented and the A4 group starting from the modular group.
628 citations
TL;DR: In this paper, a particularly symmetric model of neutrino mixings where, with good accuracy, the atmospheric mixing angle �23 is maximal, �13 = 0 and the solar angle satisfies sin 2 �12 = 1 (HPS) matrix is discussed.
612 citations
TL;DR: In this article, a grand unified model based on SUSY SU(5) in extra dimensions and on the flavour group A4 × U(1) was proposed to reproduce tri-bimaximal mixing for neutrinos with the accuracy required by the data, also leading to a natural description of the observed pattern of quark masses and mixings.
Abstract: We discuss a grand unified model based on SUSY SU(5) in extra dimensions and on the flavour group A4 × U(1) which, besides reproducing tri-bimaximal mixing for neutrinos with the accuracy required by the data, also leads to a natural description of the observed pattern of quark masses and mixings.
563 citations
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Journal Article•
28,685 citations
TL;DR: This biennial Review summarizes much of particle physics, using data from previous editions.
12,798 citations
TL;DR: MadGraph5 aMC@NLO as discussed by the authors is a computer program capable of handling all these computations, including parton-level fixed order, shower-matched, merged, in a unified framework whose defining features are flexibility, high level of parallelisation and human intervention limited to input physics quantities.
Abstract: We discuss the theoretical bases that underpin the automation of the computations of tree-level and next-to-leading order cross sections, of their matching to parton shower simulations, and of the merging of matched samples that differ by light-parton multiplicities. We present a computer program, MadGraph5 aMC@NLO, capable of handling all these computations — parton-level fixed order, shower-matched, merged — in a unified framework whose defining features are flexibility, high level of parallelisation, and human intervention limited to input physics quantities. We demonstrate the potential of the program by presenting selected phenomenological applications relevant to the LHC and to a 1-TeV e + e − collider. While next-to-leading order results are restricted to QCD corrections to SM processes in the first public version, we show that from the user viewpoint no changes have to be expected in the case of corrections due to any given renormalisable Lagrangian, and that the implementation of these are well under way.
6,509 citations
TL;DR: The Pythia program as mentioned in this paper can be used to generate high-energy-physics ''events'' (i.e. sets of outgoing particles produced in the interactions between two incoming particles).
Abstract: The Pythia program can be used to generate high-energy-physics ''events'', i.e. sets of outgoing particles produced in the interactions between two incoming particles. The objective is to provide as accurate as possible a representation of event properties in a wide range of reactions, within and beyond the Standard Model, with emphasis on those where strong interactions play a role, directly or indirectly, and therefore multihadronic final states are produced. The physics is then not understood well enough to give an exact description; instead the program has to be based on a combination of analytical results and various QCD-based models. This physics input is summarized here, for areas such as hard subprocesses, initial- and final-state parton showers, underlying events and beam remnants, fragmentation and decays, and much more. Furthermore, extensive information is provided on all program elements: subroutines and functions, switches and parameters, and particle and process data. This should allow the user to tailor the generation task to the topics of interest.
6,300 citations
TL;DR: Pythia 8.2 is the second main release after the complete rewrite from Fortran to C++, and now has reached such a maturity that it offers a complete replacement for most applications, notably for LHC physics studies.
4,503 citations