13,050 research outputs found
The Physics of UHECRs: Spectra, Composition and the Transition Galactic-Extragalactic
We review the experimental evidences about flux and mass composition of ultra
high energy cosmic rays in connection with theoretical scenarios concerning
astrophysical sources. In this context, we also address the discussion about
the expected transition between cosmic rays produced inside the Galaxy and
those coming from the intergalactic space.Comment: 6 pages, 10 figures, invited talk given at the "2016 International
Conference on Ultra-High Energy Cosmic Rays (UHECR2016)", Kyoto (Japan),
11-14 October 2016, version accepted for publication on JPS Conference
Proceeding
B Physics at the Z0 Resonance
B physics results from e+ e- annihilation at the Z0 resonance are reviewed. A
vast program is summarised, including the study of B+, B0d, B0s and b baryon
lifetimes, the time dependence of B0d and B0s oscillations, the width
difference in the B0s system, and the measurements of the magnitudes of the CKM
matrix elements Vcb and Vub.Comment: 17 pages, 8 figures, presented at the UK Phenomenology Workshop on
Heavy Flavour and CP Violation, 17-22 September 200
Avaliação da casca de arroz e palhada de soja na decomposição de carcaças de frangos de corte e qualidade dos compostos orgânicos resultantes.
Projeto/Plano de Ação: 03.05.1.21.00-03
Effect of Charged Scalar Loops on Photonic Decays of a Fermiophobic Higgs
Higgs bosons with very suppressed couplings to fermions ("Fermiophobic Higgs
bosons", h_f) can decay to two photons (\gamma\gamma) with a branching ratio
significantly larger than that expected for the Standard Model Higgs boson for
m_{h_f}<150 GeV. Such a particle would give a clear signal at the LHC and can
arise in the Two Higgs Doublet Model (type I) in which h_f -> \gamma\gamma is
mediated by W^+ and charged Higgs boson (H^+) loops. We show that the H^+ loops
can cause both constructive and destructive contributions with a magnitude
considerably larger than the anticipated precision in the measurement of the
photonic decay channel at future hadron and lepton colliders.Comment: 18 pages, 5 figures, clarifications added, one reference added,
accepted by Physical Review
Casca de arroz e palhada de soja na compostagem de carcaças de frango de corte.
Projeto: 03.07.09.049
Phase locking dynamics of dipolarly coupled vortex-based spin transfer oscillators
Phase locking dynamics of dipolarly coupled vortices excited by
spin-polarized current in two identical nanopillars is studied as a function of
the interpillar distance L. Numerical study and analytical model have proved
the remarkable efficiency of magneto-static interaction to achieve phase
locking. Investigating the dynamics in the transient regime towards phase
locking, we extract the evolution of the locking time \tau, the coupling
strength {\mu} and the interaction energy W. Finally, we compare this coupling
energy with the one obtained by simple model.Comment: 4 pages, 4 figure
Strong Coupling Constant from Scaling Violations in Fragmentation Functions
We present a new determination of the strong coupling constant alpha_s
through the scaling violations in the fragmentation functions for charged
pions, charged kaons, and protons. In our fit we include the latest e+e-
annihilation data from CERN LEP1 and SLAC SLC on the Z-boson resonance and
older, yet very precise data from SLAC PEP at center-of-mass energy sqrt(s)=29
GeV. A new world average of alpha_s is given.Comment: 10 pages, 3 eps figue
Open string with a background B-field as the first order mechanics, noncommutativity and soldering formalism
To study noncommutativity properties of the open string with constant B-field
we construct a mechanical action which reproduces classical dynamics of the
string sector under consideration. It allows one to apply the Dirac
quantization procedure for constrained systems in a direct and unambiguous way.
The mechanical action turns out to be the first order system without taking the
strong field limit . In particular, it is true for zero
mode of the string coordinate which means that the noncommutativity is
intrinsic property of this mechanical system. We describe the arbitrariness in
the relation existent between the mechanical and the string variables and show
that noncommutativity of the string variables on the boundary can be removed.
It is in correspondence with the result of Seiberg and Witten on relation among
noncommutative and ordinary Yang-Mills theories. The recently developed
soldering formalism helps us to establish a connection between the original
open string action and the Polyakov action.Comment: Revtex4, 8 pages. To appear in Physical Review
Efeito da interação progênies x ambientes no ganho com a seleção para múltiplos caracteres e na resposta correlacionada em feijão.
O objetivo deste trabalho foi verificar o efeito da interação progênies x ambientes (gerações/safras) no ganho com a seleção e na resposta correlacionada para as características porte da planta, sanidade, tipo e produtividade de grãos e em todas simultaneamente (índice Z, que é o somatório de todas as variáveis padronizadas)
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