scholarly journals Looking for nonperturbative effects of the electroweak interaction at the LHC

2019 ◽  
Vol 34 (09) ◽  
pp. 1950053
Author(s):  
Boris A. Arbuzov ◽  
Ivan V. Zaitsev
Keyword(s):  
Nonperturbative Effects ◽  
Pair Production ◽  
Effective Interaction ◽  
Electroweak Interaction ◽  
Strong Support ◽  
Planck Scale ◽  
The Other ◽  
Spontaneous Generation ◽  
Nonperturbative Effect ◽  
Existing Data

We are considering a possibility for detecting nonperturbative effect in process of top pair production in association with a high [Formula: see text] photon. Starting from previous results on two solutions for a spontaneous generation of an effective interaction of a top pair with a pair of electroweak bosons, we show that a solution with effective cutoff [Formula: see text] is already contradicting to the existing data, while the other one with [Formula: see text] (just the Planck scale) could be reconciled with data and give predictions for process [Formula: see text], which could be effectively checked at the LHC with [Formula: see text]. The confirmation of the predictions would mean a strong support for the existence of nonperturbative effects in the electroweak interaction.

scholarly journals CDF Wjj ANOMALY AS A NONPERTURBATIVE EFFECT OF THE ELECTROWEAK INTERACTION

2012 ◽  
Vol 27 (03n04) ◽  
pp. 1250012 ◽  
Author(s):  
BORIS A. ARBUZOV ◽  
IVAN V. ZAITSEV
Keyword(s):  
Nonperturbative Effects ◽  
W Boson ◽  
Invariant Mass Distribution ◽  
Effective Interaction ◽  
Electroweak Interaction ◽  
Bound State ◽  
Gauge Invariant ◽  
Nonperturbative Effect ◽  
Compensation Approach ◽  
Existing Data

The recently reported CDF excess at 120–160 GeV in invariant mass distribution of jet pairs accompanying W-boson1 is tentatively interpreted as a bound state of two W decaying to quark–antiquark pair. Nonperturbative effects of EW interaction obtained by application of Bogoliubov compensation approach lead to such bound state due to existence of anomalous three-boson gauge-invariant effective interaction. The application of this scheme gives satisfactory agreement with existing data without any adjusting parameter but the bound state mass 145 GeV.

scholarly journals NONPERTURBATIVE SOLUTIONS IN THE ELECTROWEAK THEORY WITH $\bar t t$ CONDENSATE AND THE t-QUARK MASS

2011 ◽  
Vol 26 (29) ◽  
pp. 4945-4958 ◽  
Author(s):  
BORIS A. ARBUZOV ◽  
IVAN V. ZAITSEV
Keyword(s):  
Satisfactory Agreement ◽  
Quark Mass ◽  
Effective Interaction ◽  
Electroweak Interaction ◽  
Higgs Doublet ◽  
Bound State ◽  
Heavy Quarks ◽  
Spontaneous Generation ◽  
Composite Higgs ◽  
Compensation Principle

We apply Bogoliubov compensation principle to the gauge electroweak interaction. The nontrivial solution of compensation equations for anomalous three-boson gauge invariant effective interaction uniquely defines its form-factor and parameters of the theory including value of gauge electroweak coupling [Formula: see text] in satisfactory agreement with the experimental value. A possibility of spontaneous generation of effective four-fermion interaction of heavy quarks is demonstrated. This interaction defines an equation for a scalar bound state of heavy quarks which serve as a substitute for the elementary scalar Higgs doublet. As a result we calculate the t-quark mass mt = 177 GeV in satisfactory agreement with the experimental value. The results strongly support idea of [Formula: see text] condensate as a source of the electroweak symmetry breaking. The approach predicts heavy composite Higgs scalar MH ≃ 1800 GeV .

Signature change in p-adic and noncommutative FRW cosmology

2014 ◽  
Vol 29 (27) ◽  
pp. 1450155 ◽  
Author(s):  
Goran S. Djordjevic ◽  
Ljubisa Nesic ◽  
Darko Radovancevic
Keyword(s):  
Loop Quantum Gravity ◽  
Initial Conditions ◽  
Planck Scale ◽  
The Other ◽  
Frw Cosmology ◽  
Signature Change ◽  
Discrete Nature ◽  
Frw Metric ◽  
The Universe ◽  
Friedmann Robertson Walker

The significant matter for the construction of the so-called no-boundary proposal is the assumption of signature transition, which has been a way to deal with the problem of initial conditions of the universe. On the other hand, results of Loop Quantum Gravity indicate that the signature change is related to the discrete nature of space at the Planck scale. Motivated by possibility of non-Archimedean and/or noncommutative structure of space–time at the Planck scale, in this work we consider the classical, p-adic and (spatial) noncommutative form of a cosmological model with Friedmann–Robertson–Walker (FRW) metric coupled with a self-interacting scalar field.

scholarly journals Weak scale from Planck scale: Mass scale generation in a classically conformal two-scalar system

2020 ◽  
Vol 2020 (3) ◽  
Author(s):  
Junichi Haruna ◽  
Hikaru Kawai
Keyword(s):  
Scalar Field ◽  
Standard Model ◽  
Planck Scale ◽  
Vacuum Expectation ◽  
Vacuum Expectation Value ◽  
The Other ◽  
Expectation Value ◽  
Weak Scale ◽  
The Standard Model ◽  
The One

Abstract In the standard model, the weak scale is the only parameter with mass dimensions. This means that the standard model itself cannot explain the origin of the weak scale. On the other hand, from the results of recent accelerator experiments, except for some small corrections, the standard model has increased the possibility of being an effective theory up to the Planck scale. From these facts, it is naturally inferred that the weak scale is determined by some dynamics from the Planck scale. In order to answer this question, we rely on the multiple point criticality principle as a clue and consider the classically conformal $\mathbb{Z}_2\times \mathbb{Z}_2$ invariant two-scalar model as a minimal model in which the weak scale is generated dynamically from the Planck scale. This model contains only two real scalar fields and does not contain any fermions or gauge fields. In this model, due to a Coleman–Weinberg-like mechanism, the one-scalar field spontaneously breaks the $ \mathbb{Z}_2$ symmetry with a vacuum expectation value connected with the cutoff momentum. We investigate this using the one-loop effective potential, renormalization group and large-$N$ limit. We also investigate whether it is possible to reproduce the mass term and vacuum expectation value of the Higgs field by coupling this model with the standard model in the Higgs portal framework. In this case, the one-scalar field that does not break $\mathbb{Z}_2$ can be a candidate for dark matter and have a mass of about several TeV in appropriate parameters. On the other hand, the other scalar field breaks $\mathbb{Z}_2$ and has a mass of several tens of GeV. These results will be verifiable in near-future experiments.

Poly(amide) oligomers with silarylene and/or germarylene units – synthesis, characterization and thermal studies

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Luis H. Tagle ◽  
Claudio A. Terraza ◽  
Angel Leiva ◽  
Patricia Alvarez
Keyword(s):  
Main Chain ◽  
Effective Interaction ◽  
Thermal Studies ◽  
The Other ◽  
Spectroscopic Techniques ◽  
Aromatic Diamines ◽  
Packing Factor ◽  
Degradation Temperature ◽  
General Terms ◽  
Acid Dichloride

AbstractTen poly(amide) oligomers were prepared from four acid dichlorides and two full-aromatic diamines, the latter containing silicon or germanium in their structure. The polymers, which contain Et/Me, Et/Et and nBu/nBu combinations on heteroatom of the acid dichloride moiety, were characterized by spectroscopic techniques, including 29Si NMR. The yields obtained and the ηιnh values established were low, indicating the low molecular weight nature of the polymers. Thermal stability was also evaluated by TG and DSC techniques. When a methyl group was replaced by a Et, the Tg of the poly(amides) (PAs) was increased in accordance with the gain in the flexibility of the chain. However and in general terms, the PAs with nBu groups show the inverse effect. Probably, the possibility of an effective interaction between these side chains affects negatively the flexibility of the main chain. On the other hand, PAs that contain single silicon in their structure show lower Tg values than the Ge-containing PAs. For the other heteroatom combinations, similar results were obtained. This fact does not agree with the lower size of silicon atom which should increase the molecular rigidity and therefore their Tg values. Probably, the influence of the side groups is decisive in hindering the chain rotation. The thermal degradation temperature (TDT) changed in agreement with the packing factor of the chains which was depending on the size of substitute groups. So, when Et group was replaced by nBu as lateral group, lower TDT were recovered. With respect to the heteroatoms used in the main chain, the TDT values do not show a clear tendency.

Benthic Habitats and the Effects of Fishing

2005 ◽  
Keyword(s):  
Habitat Management ◽  
Research Council ◽  
Fish Habitat ◽  
Effective Interaction ◽  
National Research Council ◽  
Fishing Effort ◽  
Socioeconomic Impacts ◽  
Management Measures ◽  
Management Plans ◽  
Existing Data

<strong><em>Abstract. </em></strong>This paper summarizes the results of the National Research Council Study on the Effects of Bottom Trawling and Dredging on Seafloor Habitat (National Research Council 2002). The report concludes that integration of existing data on the effects of trawls and dredges, level of fishing effort, and distribution of seafloor habitats would facilitate development of habitat management plans. Current and new management measures should be assessed regularly to provide a better understanding of how various restrictions affect fish habitat and to determine the socioeconomic impacts on the fishing industry and local communities. Resolution of the different, and at times conflicting, ecological and socioeconomic goals will require not only a better understanding of the relevant ecosystems and fisheries but also more effective interaction among stakeholders.

scholarly journals ELECTROMAGNETIC TRANSITIONS WITH EFFECTIVE OPERATORS

2005 ◽  
Vol 14 (01) ◽  
pp. 95-103 ◽  
Author(s):  
IONEL STETCU ◽  
BRUCE R. BARRETT ◽  
PETR NAVRÁTIL ◽  
CALVIN W. JOHNSON
Keyword(s):  
Effective Interaction ◽  
The Other ◽  
Core Shell ◽  
Body System ◽  
Cluster Approximation ◽  
Expectation Values ◽  
Model Spaces ◽  
Reduced Space ◽  
Model Formalism ◽  
Effective Operators

In the no-core shell model formalism we compute effective one- and two-body operators, using the Lee–Suzuki procedure within the two-body cluster approximation. We evaluate the validity of the latter through calculations in reduced model spaces. In particular, we test the results for the two-body system and find that indeed the effective operators in the reduced space reproduce the expectation values or transition strengths computed in the full space. On the other hand, the renormalization for operators in the case of 6Li is very weak, suggesting the need for higher-body clusters in computing the effective interaction.

Morphological phylogeny and review of the generic classification of Colletinae (Hymenoptera: Colletidae)

2020 ◽  
Author(s):  
Rafael R Ferrari ◽  
Laurence Packer
Keyword(s):  
Functional Traits ◽  
Strong Support ◽  
Molecular Data ◽  
The Other ◽  
Molecular Phylogenies ◽  
Phylogenetic Hypotheses

Abstract The bee subfamily Colletinae includes 542 species, the vast majority of which (518 spp.) belong to Colletes. The generic placement of the remaining 24 species has been controversial, resulting in several classifications being proposed. Despite several recently published molecular phylogenies of Colletinae, it remains unknown (1) what morphological synapomorphies support the recognized genera, (2) in which direction some relevant functional traits (e.g. basitibial plate) have evolved and (3) whether morphology supports the available molecular data. Herein, we provide a morphological phylogeny of Colletinae, which was constructed through parsimony analyses of 186 characters. In total, 50 ingroup species were included representing all major lineages of Colletes (29 spp.), plus all but three of the non-Colletes species of Colletinae (21 spp.). Trees were estimated through equal weights and extended implied weighting. Both provide strong support for the monophyly of Colletinae and indicate that the subfamily is defined by four unique synapomorphies. Our results also confirm recent phylogenetic hypotheses showing that Colletinae can be subdivided into two major clades: one comprising the reciprocally monophyletic Mourecotelles and Xanthocotelles; the other includes Colletes plus Hemicotelles, which are also reciprocally monophyletic. We also provide a fully illustrated key to facilitate generic identification of the Colletinae.

Relationships Among Phaseoloid Legumes Based on Sequences from Eight Chloroplast Regions

2009 ◽  
Vol 34 (1) ◽  
pp. 115-128 ◽  
Author(s):  
Saša Stefanović ◽  
Bernard E. Pfeil ◽  
Jeffrey D. Palmer ◽  
Jeff J. Doyle
Keyword(s):  
Chloroplast Dna ◽  
Dna Markers ◽  
Strong Support ◽  
The Other ◽  
Support Network ◽  
Generic Level ◽  
Shared History ◽  
Rate Acceleration ◽  
Codon Positions ◽  
Chloroplast Dna Markers

Generic level relationships in phaseoloid legumes have received much attention using chloroplast DNA markers. However, despite this attention not all relationships are yet well-resolved. This study includes trnL-F sequences from across a wide sample of phaseoloid legumes as well as seven additional chloroplast DNA loci (rbcL, atpB, trnK/matK, rpl2, clpP, rps16, and ycf4) analyzed separately and in combination. Together, these data provide support for many relationships generally consistent with, but only weakly supported, in earlier studies. Some major discordant phylogenetic results were found in our separate analyses; for example, ycf4 sequences group Glycine and Teramnus with strong support; however, the combined analysis of the remaining seven loci found incongruent groupings (Glycine and Psoraleeae genera; Teramnus and Amphicarpaea) also with strong support. Network analysis of ycf4 revealed that the conflicting signal (relative to the other seven loci) came from first and second codon positions. These positions also showed significant rate acceleration, together indicating that selection driving convergent molecular evolution is the likely cause of the signal in ycf4, rather than shared history. The major clades within the phaseoloid legumes supported by our analysis are discussed.

The orientation behaviour of multiple chromosome configurations in acridid grasshoppers

Genome ◽  
1987 ◽  
Vol 29 (2) ◽  
pp. 292-308 ◽  
Author(s):  
B. John
Keyword(s):  
Key Words ◽  
Reciprocal Translocation ◽  
Chiasma Frequency ◽  
The Other ◽  
Robertsonian Fusion ◽  
Orientation Behaviour ◽  
Chiasma Distribution ◽  
First Time ◽  
Existing Data ◽  
Combined Data

The existing data on the behaviour of multiple chromosome configurations arising from single interchanges between either metacentric–telocentric or telocentric–telocentric nonhomologues in 10 species of acridid grasshoppers are compared with data from four new cases. Two of these new cases involve metacentric–telocentric exchanges but the other two, for the first time in acridids, deal with a reciprocal translocation between two nonhomologous metacentrics. The combined data are used to evaluate the factors that influence multiple orientation in this family of grasshoppers and reemphasize the importance of chiasma frequency and chiasma distribution for multiple behaviour. This conclusion is reinforced by a consideration of the known cases of chain of three multiples originating from the Robertsonian fusion of nonhomologous telocentrics in acridoids. Key words: acridid grasshoppers, multiple chromosome configurations, chiasma distribution, orientation behaviour.

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