In order to expand the astrophysical reach of gravitational wave (GW) detectors, several
interferometer topologies have been proposed, in the past, to evade the thermodynamic
and quantum mechanical limits in future detectors. In this work, we make a systematic
comparison among these topologies by considering their sensitivities and complexities.
We numerically optimize their sensitivities by introducing a cost function that tries
to maximize the broadband improvement over the sensitivity of current detectors. We
find that frequency-dependent squeezed-light injection with a 100 m scale filter cavity
yields a good broadband sensitivity, with low complexity, and good robustness against
optical loss. This study gives us a guideline for the near-term experimental research
programs in enhancing the performance of future GW detectors. (paper)$$$$
The charged and doubly charged Higgs bosons (H^{±} and H^{±±}) are
the typical particles predicted by the Higgs triplet model (HTM) and the observation
of these particles might be regarded as direct evidence of the HTM. In this paper,
we investigate the pair production of the charged and doubly Higgs bosons at the International
Linear Collider (ILC): e^{+}e^{−}→H^{+}H^{−}(H^{++}H^{−−})
and e^{+}e^{−}→ZH^{+}H^{−}(H^{++}H^{−−}).
We present the production cross sections and the distributions of the various observables,
i.e., the distributions of the transverse momenta and the rapidity distributions for
out-going particles. Our numerical results show that, as long as the charged and doubly
charged Higgs bosons masses are not too heavy, their possible signals might be detected
via these processes in future ILC experiments. A simply phenomenological analysis
is also given. (paper)$$$$
In this paper, we study the leading-twist distribution amplitude (DA) of the heavy
pseudoscalars (HPs), such as η_{c}, η_{b}, and B_{c}, within
the QCD theory in the background fields. New sum rules up to dimension-six condensates
for both the HP decay constants and their leading-twist DA moments are presented.
From the sum rules for the HP decay constants, we obtain f_{ηc}
= 453 ± 4MeV, f_{Bc} = 498 ± 14 MeV, and f_{ηb}
= 811 ± 34 MeV. Based on the sum rules for the HPs' leading-twist DA moments, we construct
a new model for the η_{c}, η_{b}, and B_{c} leading-twist
DAs. Our present HP DA model is also adaptable for the light pseudoscalar DAs, such
as the pion and kaon DAs. Thus, it shall be applicable for a wide range of QCD exclusive
processes. As an application, we apply the η_{c} leading-twist DA to calculate
the B_{c} → η_{c} transition form factor f_{+}^{Bc→ηc}
(q2). At the maximum recoil region, we obtain f_{+}^{Bc→ηc}
(0) = 0.612_{-0.052}^{+0.053}. Furthermore we predict the branching
ratio for the semi-leptonic decay B_{c} → η_{c}lν and obtain B(B_{c}
→ η_{c}lν) = (7.70_{-1.48}^{+1.65}) x 10^{-3} for
massless leptons, which is consistent with the light-cone sum rules estimation obtained
in the literature. (orig.)$$$$
Teaching methods are presented based on a theoretical logical thesis of: ^{A}
Standard Elementary Particle,^{i}nstead of the current 200 odd different subatomic
particles, and their plausible derivation from such a standard particle, similar to
the derivation of our body cells from a multi potential ^{S}tem Cell,^{T}he
thesis reintroduces the theory of ^{A} Material Ether^{a}s a necessary
medium for the transmission of the Electro-Magnetic-Gravitational Waves. It solves
and demystifies the following riddles: 1. The A ether Vacuum, by offering a plausible
composition of ^{A}n elastic solid medium,^{t}hat meets the specific
physical requirements needed for the transmission of the electro magnetic gravitational
waves, Explains the vast amount of Potential Energy that such an A ether can carry,
That there is No Action at a Distance, 2. It explains ^{Q}uantum Mechanics,^{o}n
simple Newtonian principles, It nullifies the ^{H}eisenberg Uncertainty Principle,^{s}howing
that there is no uncertainty whatsoever, for individual particle interactions, and
the existence of ^{F}unctional Barriers^{f}or the disc like aggregates
of contiguous particles representing ^{I}ntra-atomic Electrons,^{a}nd
A full ^{P}hysical^{e}xplanation of the their quantum numbers, their
electronic shells, as well as: The Pauli Exclusion Principle. 3. The possible explanation
of Hubbell's Law without an expansion of the Universe, that the ^{C}osmic
Red Shift^{g}ives the illusion of an expanding Universe similar to that of
the ^{B}ent Stick^{i}n the water due to refraction. 4. That the Big
Bang ^{I}nflation Theory,^{f}or the origin of the Universe is: a Figment
of Imagination similar to Aladdin's ^{D}jinni out of the bottle.^{a}nd
a Fantasy of Mathematics with complete lack of touch with reality. The thesis suggests
a plausible explanation - Modus Operandi - for, and composition of: i) Gravity, II)
The structure of nucleons, III) The nature of the strong force, IV) The structure
of the string of The String Theory$$$$
Energy spectra of gluinonium http://dx.doi.org/10.1142/S0218301311040803 by Vasconcellos, C.A.Z.; Hadjimichef, D. (Instituto de Fisica, Universidade Federal do
Rio Grande do Sul, Av. Bento Goncalves 9500, CEP 91501-970, Porto Alegre, RS (Brazil));
Silva, M.L.L. da (Universidade Federal de Pelotas, Rua Gomes Carneiro 1, CEP 96010-610,
Pelotas, RS (Brazil)); Razeira, M.; Mesquita, A. (Universidade de Caxias do Sul, Centro
de Ciencias Exatas e Tecnologia, Rua Francisco Getulio Vargas 1130, CEP 95070-560,
Caxias do Sul, RS (Brazil)); Rodriguez, M.C. (Universidade Federal do Rio Grande,
Av. Italia km 8, CEP 96201-900, Rio Grande, RS (Brazil)) Read MoreCollapse
[en]
We investigate relativistic bound states for a hypothetical light scalar gluino pair
(gluinonium), in the framework of the covariant Bethe-Salpeter equation (BSE). In
this paper, we derive, from the covariant BSE for a fermion-anti-fermion system, using
charge conjugation, the corresponding bound-state equation for a gluino pair and we
then formulate, for a static harmonic kernel, the coupled differential equations for
the corresponding static Bethe-Salpeter amplitude. The steps of our approach then
include a numerical solution of the Bethe-Salpeter amplitude for a two-body interaction
consisting of scalar, pseudo-scalar, and four-vector components and the determination
of the energy spectrum for the ground and the radially excited states of massive gluinonium.
We found the energy spectrum and radial distributions of fundamental and excited states
of gluinonium. The comparison of the values obtained in the extreme relativistic case
with the corresponding values predicted by a harmonic oscillator potential model shows
that there is good agreement between the two formulations. The predictions of the
binding energy of glunionium in the non-relativistic model are however systematically
higher. (author)$$$$
Phase transition in high density matter with boson condensation 38 KB - http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/40/048/40048051.pdf - Text Version by Cavagnoli, Rafael; Menezes, Debora Peres (Universidade Federal de Santa Catarina (UFSC),
Florianopolis, SC (Brazil)); Providencia, Constanca (Universidade de Coimbra (UC),
Coimbra (Portugal)); Sociedade Brasileira de Fisica (SBF), Sao Paulo, SP (Brazil) Read MoreCollapse
Dark matter as a non-linear effect of gravitation 126 KB - http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/40/100/40100166.pdf - Text Version by Maia, M.D.; Capistrano, A.J.S. (Universidade de Brasilia (UnB), DF (Brazil). Inst.
de Fisica), E-mail: maia@unb.br, E-mail: capistrano_bd@yahoo.com.br; Sociedade Brasileira de Fisica (SBF), Sao Paulo, SP (Brazil) Read MoreCollapse
[en]
The rotation curves of stars in disk galaxies are calculated with the Newtonian law
of motion applied to a scalar potential derived from the geodesic equation, only,
under the slow motion condition, the so-called Nearly Newtonian Gravity (NNG). A nearly
Newtonian gravitational potential, Φ_{NN} = -1/2 c^{2} (1+g_{44}),
is obtained, characterized by an exact solution of Einsteins equations, with the non-linear
effects present in the component g_{44} . This gravitational field lies somewhere
between General Relativity and Newtonian Gravity. Therefore, Einsteins equations and
the equivalence principle are preserved, but the general covariance is broken. The
resulting curves are remarkably close to the observed rotation curves in spiral galaxies,
suggesting that a substantial component of dark matter may be explained by the non-linearity
of Einsteins equations. (author)$$$$
A measurement of differential cross sections for the production of a pair of isolated
photons in proton-proton collisions at √(s) = 7 TeV is presented. The data sample
corresponds to an integrated luminosity of 5.0 fb^{-1} collected with the
CMS detector. A data-driven isolation template method is used to extract the prompt
diphoton yield. The measured cross section for two isolated photons, with transverse
energy above 40 and 25 GeV respectively, in the pseudorapidity range vertical stroke
η vertical stroke < 2.5, vertical stroke η vertical stroke is not an element of [1.44,
1.57] and with an angular separation ΔR > 0.45, is 17.2 ± 0.2(stat) ± 1.9(syst) ±
0.4(lumi) pb. Differential cross sections are measured as a function of the diphoton
invariant mass, the diphoton transverse momentum, the azimuthal angle difference between
the two photons, and the cosine of the polar angle in the Collins-Soper reference
frame of the diphoton system. The results are compared to theoretical predictions
at leading, next-to-leading, and next-to-next-to-leading order in quantum chromodynamics.
(orig.)$$$$
Cosmic string interactions in a Lorentz invariance violation framework 44 KB - http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/41/131/41131115.pdf - Text Version by Ferreira, Cristine Nunes (Instituto Federal de Educacao, Ciencia e Tecnologia Fluminense,
Campos dos Goytacases, RJ (Brazil)); Helayel Neto, Jose Abdalla; Lima, Carlos Eduardo
Campos (Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)); Sociedade Brasileira de Fisica (SBF), Sao Paulo, SP (Brazil) Read MoreCollapse