Physical sciences topic list of research papers
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Geometric origin of large lepton mixing in a higher-dimensional spacetime
Abstract The large mixing in the lepton sector observed in the recent neutrino-oscillation experiments strongly suggests that nature of left-handed lepton doublets is very different from that of left-handed quark doublets. This means that there is a ...
2002 / T. Watari, T. Yanagida -
Obstructions on the horizon geometry from string theory corrections to Einstein gravity
Abstract Higher-dimensional Einstein gravity in vacuum admits static black hole solutions with an Einstein manifold of nonconstant curvature as a horizon. This gives a much richer family of static black holes than in four-dimensional GR. However, as ...
2005 / Gustavo Dotti, Reinaldo J. Gleiser -
Effective restoration of chiral symmetry in excited mesons
Abstract A fast restoration of chiral symmetry in excited mesons is demonstrated. A minimal “realistic” chirally symmetric confining model is used, where the only interaction between quarks is the linear instantaneous Lorentz-vector confining...
2006 / R.F. Wagenbrunn, L.Ya. Glozman -
d-dimensional unitarity cut method
Abstract We develop a unitarity method to compute one-loop amplitudes with massless propagators in d = 4 − 2 ...
2006 / Charalampos Anastasiou, Ruth Britto, Bo Feng, Zoltan Kunszt, Pierpaolo Mastrolia -
A new method to solve the non-perturbative renormalization group equations
Abstract We propose a method to solve the non-perturbative renormalization group equations for the n-point functions. In leading order, it consists in solving the equations obtained by closing the infinite hierarchy of equations for the n-point...
2005 / Jean-Paul Blaizot, Ramón Méndez-Galain, Nicolás Wschebor -
Four-nucleon force in chiral effective field theory
Abstract We derive the leading contribution to the four-nucleon force within the framework of chiral effective field theory. It is governed by the exchange of pions and the lowest-order nucleon–nucleon contact interaction and includes effects due to ...
2006 / E. Epelbaum -
An imaginary potential with universal normalization for dissipative processes in heavy-ion reactions
Abstract In this work we present new coupled channel calculations with the São Paulo potential (SPP) as the bare interaction, and an imaginary potential with system and energy independent normalization that has been developed to take into account...
2008 / D. Pereira, J. Lubian, J.R.B. Oliveira, D.P. de Sousa, L.C. Chamon -
Non-Abelian solutions in a Melvin magnetic universe
Abstract We show the existence of D = 4 non-Abelian solutions approaching asymptotically a dilatonic Melvin spacetime background. An exact solution...
2008 / Burkhard Kleihaus, Jutta Kunz, Eugen Radu -
Kerr–Newman–de Sitter solution on DGP brane
Abstract We find an exact solution of Kerr–Newman–de Sitter type on the braneworld (4D) of the DGP model. When a constant 4D Ricci scalar is assumed, only zero (flat) and a positive (de Sitter) values satisfy the Hamiltonian constraint equation...
2008 / Daeho Lee, Chang-Young Ee, Myungseok Yoon -
Tensor structure from scalar Feynman matroids
Abstract We show how to interpret the scalar Feynman integrals which appear when reducing tensor integrals as scalar Feynman integrals coming from certain nice matroids.
2011 / Dirk Kreimer, Karen Yeats -
Ultraviolet divergences of flavor changing amplitudes in the littlest Higgs model with T-parity
Abstract Flavor changing neutral current processes are studied in the littlest Higgs model with T-parity. It is found that the logarithmic divergence reported earlier in Z boson flavor changing processes is exactly canceled by contributions from...
2008 / Toru Goto, Yasuhiro Okada, Yasuhiro Yamamoto -
“Super-radiance” and the width of exotic baryons
Abstract It is suggested that the narrow width of the recently observed resonance Θ +(1540) with strangeness S=+1 could be a result of the super-radiance mechanism of the redistribution of the widths of overlapping resonances...
2004 / N. Auerbach, V. Zelevinsky, A. Volya -
Solving the discrepancy among the light elements abundances and WMAP
Abstract Within the standard Big Bang nucleosynthesis (BBN) and cosmic microwave background (CMB) framework, the baryon density measured by the Wilkinson Microwave Anisotropy Probe (WMAP) or the primordial D abundance is much higher than the one...
2004 / Kazuhide Ichikawa, Masahiro Kawasaki, Fuminobu Takahashi -
The Unruh thermal spectrum through scalar and fermion tunneling
Abstract The thermal spectrum seen by accelerated observers in Minkowski space vacuum, the Unruh effect, is derived within the tunneling mechanism. This is a new result in this mechanism and it completes the treatment of Unruh effect via tunneling....
2009 / Debraj Roy -
Vector mesons on the light front
Abstract We apply the light-front quantization to the Nambu–Jona-Lasinio model with the vector interaction, and compute vector meson's mass and light-cone wavefunction in the large N limit. Following the same procedure as in the previous analyses...
2004 / K. Naito, S. Maedan, K. Itakura -
Quark mass dependence of s-wave baryon resonances
Abstract We study the quark mass dependence of J P =1/2− s-wave baryon resonances. Parameter free results are obtained in terms of the leading order chiral Lagrangian. In the ‘heavy’ ...
2003 / C Garcı́a-Recio, M.F.M Lutz, J Nieves -
Maximizing the spin correlation of top quark pairs produced at the large hadron collider
Abstract The measurement of top quark spin correlation is an important tool for precise studies of top quark interactions. In this Letter I construct a quantization axis maximizing the spin correlation at the LHC within the Standard Model. Using...
2005 / Peter Uwer -
Scalar–tensor theory of gravity carrying a conserved current
Abstract A general scalar–tensor theory of gravity carries a conserved current for a trace-free minimally coupled scalar field, under the condition that the potential V ( ϕ ...
2005 / Abhik Kumar Sanyal -
Strangeness asymmetry of the nucleon in the statistical parton model
Abstract We extend to the strange quarks and antiquarks, the statistical approach of parton distributions and we calculate the strange quark asymmetry s − ...
2007 / Claude Bourrely, Jacques Soffer, Franco Buccella -
Centrality dependence of strangeness production in heavy-ion collisions as a geometrical effect of core–corona superposition
Abstract It is shown that data on strange particle production as a function of centrality in Au–Au collisions at s NN ...
2009 / F. Becattini, J. Manninen