
Pierre Auger Collaboration(Aab, A. et al), & Pastor, S. (2014). A targeted search for point sources of EeV neutrons. Astrophys. J. Lett., 789(2), L34–7pp.
Abstract: A flux of neutrons from an astrophysical source in the Galaxy can be detected in the Pierre Auger Observatory as an excess of cosmicray air showers arriving from the direction of the source. To avoid the statistical penalty for making many trials, classes of objects are tested in combinations as nine “target sets,” in addition to the search for a neutron flux from the Galactic center or from the Galactic plane. Within a target set, each candidate source is weighted in proportion to its electromagnetic flux, its exposure to the Auger Observatory, and its flux attenuation factor due to neutron decay. These searches do not find evidence for a neutron flux from any class of candidate sources. Tabulated results give the combined pvalue for each class, with and without the weights, and also the flux upper limit for the most significant candidate source within each class. These limits on fluxes of neutrons significantly constrain models of EeV proton emission from nontransient discrete sources in the Galaxy.



Pierre Auger Collaboration(Aab, A. et al), & Pastor, S. (2014). Origin of atmospheric aerosols at the Pierre Auger Observatory using studies of air mass trajectories in South America. Atmos. Res., 149, 120–135.
Abstract: The Pierre Auger Observatory is making significant contributions towards understanding the nature and origin of ultrahigh energy cosmic rays. One of its main challenges is the monitoring of the atmosphere, both in terms of its state variables and its optical properties. The aim of this work is to analyse aerosol optical depth tau(a)(z) values measured from 2004 to 2012 at the observatory, which is located in a remote and relatively unstudied area of Pampa Amarilla, Argentina. The aerosol optical depth is in average quite low – annual mean tau(a)(3.5 km) similar to 0.04 – and shows a seasonal trend with a winter minimum – tau(a)(3.5 km) – 0.03 , and a summer maximum – tau(a)(3.5 km) similar to 0.06 , and an unexpected increase from August to September tau(a)(35 km) similar to 0.055. We computed backward trajectories for the years 2005 to 2012 to interpret the air mass origin. Winter nights with low aerosol concentrations show air masses originating from the Pacific Ocean. Average concentrations are affected by continental sources (windblown dust and urban pollution), whilst the peak observed in September and October could be linked to biomass burning in the northern part of Argentina or air pollution coming from surrounding urban areas.



Pierre Auger Collaboration(Aab, A. et al), & Pastor, S. (2014). Reconstruction of inclined air showers detected with the pierre Auger Observatory. J. Cosmol. Astropart. Phys., 08(8), 019–32pp.
Abstract: We describe the method devised to reconstruct inclined cosmicray air showers with zenith angles greater than 60 degrees detected with the surface array of the Pierre Auger Observatory. The measured signals at the ground level are fitted to muon density distributions predicted with atmospheric cascade models to obtain the relative shower size as an overall normalization parameter. The method is evaluated using simulated showers to test its performance. The energy of the cosmic rays is calibrated using a subsample of events reconstructed with both the fluorescence and surface array techniques. The reconstruction method described here provides the basis of complementary analyses including an independent measurement of the energy spectrum of ultrahigh energy cosmic rays using very inclined events collected by the Pierre Auger Observatory.



Pich, A., Rosell, I., & SanzCillero, J. J. (2014). Oblique S and T constraints on electroweak stronglycoupled models with a light Higgs. J. High Energy Phys., 01(1), 157–35pp.
Abstract: Using a general effective Lagrangian implementing the chiral symmetry breaking SU(2)(L) circle times SU(2)(R) > SU(2)(L+R), we present a oneloop calculation of the oblique S and T parameters within electroweak stronglycoupled models with a light scalar. Imposing a proper ultraviolet behaviour, we determine S and T at nexttoleading order in terms of a few resonance parameters. The constraints from the global fit to electroweak precision data force the massive vector and axialvector states to be heavy, with masses above the TeV scale, and suggest that the W+W and and ZZ couplings of the Higgslike scalar should be close to the Standard Model value. Our findings are generic, since they only rely on soft requirements on the shortdistance properties of the underlying stronglycoupled theory, which are widely satisfied in more specific scenarios.



Pich, A. (2014). Precision tau physics. Prog. Part. Nucl. Phys., 75, 41–85.
Abstract: Precise measurements of the lepton properties provide stringent tests of the Standard Model and accurate determinations of its parameters. We overview the present status of tau physics, highlighting the most recent developments, and discuss the prospects for future improvements. The leptonic decays of the tau lepton probe the structure of the weak currents and the universality of their couplings to the W boson. The universality of the leptonic Z couplings has also been tested through Z > l(+)l() decays. The hadronic tau decay modes constitute an ideal tool for studying lowenergy effects of the strong interaction in very clean conditions. Accurate determinations of the QCD coupling and the Cabibbo mixing Vus have been obtained with tau data. The large mass of the tau opens the possibility to study many kinematicallyallowed exclusive decay modes and extract relevant dynamical information. Violations of flavour and CP conservation laws can also be searched for with tau decays. Related subjects such as μdecays, the electron and muon anomalous magnetic moments, neutrino mixing and Bmeson decays into tau leptons are briefly covered. Being one the fermions most strongly coupled to the scalar sector, the tau lepton is playing now a very important role at the LHC as a tool to test the Higgs properties and search for new physics at higher scales.



Pastore, A., Martini, M., Davesne, D., Navarro, J., Goriely, S., & Chamel, N. (2014). Linear response theory and neutrino mean free path using BrusselsMontreal Skyrme functionals. Phys. Rev. C, 90(2), 025804–11pp.
Abstract: The BrusselsMontreal Skyrme functionals have been successful in describing properties of both finite nuclei and infinite homogeneous nuclear matter. In their latest version, these functionals have been equipped with two extra densitydependent terms in order to reproduce simultaneously ground state properties of nuclei and infinite nuclear matter properties while avoiding at the same time the arising of ferromagnetic instabilities. In the present article, we extend our previous results of the linear response theory to include such extra terms at both zero and finite temperature in pure neutron matter. The resulting formalism is then applied to derive the neutrino mean free path. The predictions from the BrusselsMontreal Skyrme functionals are compared with ab initio methods.



Pastore, A., Davesne, D., & Navarro, J. (2014). Nuclear matter response function with a central plus tensor Landau interaction. J. Phys. G, 41(5), 055103–17pp.
Abstract: We present a method to obtain response functions in the random phase approximation (RPA) based on a residual interaction described in terms of Landau parameters with central plus tensor contributions. The response functions keep the explicit momentum dependence of the RPA, in contrast with the traditional Landau approximation. Results for symmetric nuclear matter and pure neutron matter are presented using Landau parameters derived from finiterange interactions, both phenomenological and microscopic. We study the convergence of response functions as the number of Landau parameters is increased.



Particle Data Group(Olive, K. A. et al), & HernandezRey, J. J. (2014). Review of Particle Physics. Chin. Phys. C, 38(9), 090001–1658pp.
Abstract: The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 3,283 new measurements from 899 Japers, we list, evaluate, and average measured properties of gauge bosons and the recently discovered Higgs boson, leptons, quarks, mesons, and baryons. We summarize searches for hypothetical particles such as heavy neutrinos, supersymmetric and technicolor particles, axions, dark photons, etc. All the particle properties and search limits are listed in Summary Tables. We also give numerous tables, figures, formulae, and reviews of topics such as Supersymmetry, Extra Dimensions, Particle Detectors, Probability, and Statistics. Among the 112 reviews are many that are new or heavily revised including those on: Dark Energy, Higgs Boson Physics, Electroweak Model, Neutrino Cross Section Measurements, Monte Carlo Neutrino Generators, Top Quark, Dark Matter, Dynamical Electroweak Symmetry Breaking, Accelerator Physics of Colliders, HighEnergy Collider Parameters, Big Bang Nucleosynthesis, Astrophysical Constants and Cosmological Parameters.



Park, J. H. (2014). Lepton flavor violation from righthanded neutrino thresholds. Phys. Rev. D, 89(9), 095005–6pp.
Abstract: Charged lepton flavor violation is reappraised in the context of a supersymmetric seesaw mechanism. It is pointed out that a nontrivial flavor structure of righthanded neutrinos, whose effect has been thus far less studied, can give rise to significant slepton flavor transitions. Under the premise that the neutrino Yukawa couplings are of O(1), the righthanded neutrino mixing contribution could form a basis of the μ> e gamma amplitude, which by itself might lead to an experimentally accessible rate, given a typical lowenergy sparticle spectrum. Emphasis is placed on the crucial role of the recently measured lepton mixing angle theta(13) as well as the leptonic CPviolating phases.



Pallis, C., & Shafi, Q. (2014). From hybrid to quadratic inflation with highscale supersymmetry breaking. Phys. Lett. B, 736, 261–266.
Abstract: Motivated by the reported discovery of inflationary gravity waves by the BICEP2 experiment, we propose an inflationary scenario in supergravity, based on the standard superpotential used in hybrid inflation. The new model yields a tensortoscalar ratio r similar or equal to 0.14 and scalar spectral index n(s) similar or equal to 0.964, corresponding to quadratic (chaotic) inflation. The important new ingredients are the highscale, (1.610) . 10(13) GeV, soft supersymmetry breaking mass for the gauge singlet inflaton field and a shift symmetry imposed on the Kahler potential. The end of inflation is accompanied, as in the earlier hybrid inflation models, by the breaking of a gauge symmetry at (1.27.1) . 10(16) GeV, comparable to the grandunification scale.

