Weak Radiative Decays of Hyperons in the Pole Model

1972 ◽  
Vol 50 (12) ◽  
pp. 1300-1306
Author(s):  
E. Yakimiw ◽  
G. Jakimiw
Keyword(s):  
Experimental Data ◽  
Decay Rate ◽  
Radiative Decays ◽  
Pole Model ◽  
Present Experimental Data ◽  
Correct Sign ◽  
Phase Convention ◽  
Asymmetry Parameters

It is found that the pole model which includes the decuplet pole contributions in the weak radiative decays of hyperons fails to give the correct sign of the Σ+ → pγ asymmetry parameters α, although the magnitude of the decay rate and of α are consistent with the present experimental data. This conclusion holds in the Rarita–Schwinger formalism. Earlier calculations are incorrect due mainly to an error in the spin-3/2 propagator used in the theory, and inconsistencies in the SU(3) phase convention.

Experimental Determination of the Static Equivalent Pressures of Detonative Explosions of Stoichiometric CH4/O2/N2-Mixtures and CH4/O2-Mixtures in Long Pipes

2016 ◽  
Author(s):  
Hans-Peter Schildberg
Keyword(s):  
Experimental Data ◽  
Experimental Determination ◽  
Process Design ◽  
Pressure Vessel ◽  
Gas Mixture ◽  
Detonation Pressure ◽  
Recent Past ◽  
Static Loads ◽  
Present Experimental Data

In the recent past (PVP2013-97677, PVP2014-28197, PVP2015-45286) we had started to determine the static equivalent pressures pstat of the eight detonative pressure scenarios in long and short pipes for different detonable gas mixtures. The pstat-values are of vital importance for process design: by assigning static equivalent pressures to the highly dynamic detonative pressure peaks it is possible to apply the established pressure vessel guidelines, which can only cope with static loads, for the design of detonation pressure resistant pipes. One important finding was that the ratio R between pstat at the location where transition from deflagration to detonation occurs and pstat in the region of the stable detonation strongly depends on the reactivity of the gas mixture. In this paper we present experimental data showing the variation of R over the entire explosive range of Methane/O2/N2 mixtures. Qualitatively, the results should be representative for all other combustible/O2/N2-mixtures. Furthermore, recommendations for estimating pstat values of short pipe scenarios on basis of the long pipe scenarios are given.

scholarly journals MODEL-INDEPENDENT ESTIMATES FOR THE ABELIAN Z′ BOSON AT MODERN HADRON COLLIDERS

2011 ◽  
Vol 26 (23) ◽  
pp. 4083-4100 ◽  
Author(s):  
ALEXEY GULOV ◽  
ANDREY KOZHUSHKO
Keyword(s):  
Experimental Data ◽  
Z Boson ◽  
Hadron Colliders ◽  
Present Experimental Data ◽  
Decay Widths ◽  
Model Independent

The model-independent constraints on the Abelian Z′ couplings from the LEP data are applied to estimate the Z′ production in experiments at the Tevatron and LHC. The Z′ total and partial decay widths are analyzed. The results are compared with model-dependent predictions and present experimental data from the Tevatron. If we assume the 1–2σ hints from the LEP data to be a signal of the Abelian Z′ boson, then the Tevatron data constrain the Z′ mass between 400 GeV and 1.2 TeV.

Evidence of an after-effect in the ( n , γ ) reaction on polycrystalline hafnium (IV) acetyl-acetonate complex

1969 ◽  
Vol 311 (1504) ◽  
pp. 185-190 ◽  
Keyword(s):  
Experimental Data ◽  
Electric Field ◽  
Angular Correlation ◽  
Electric Field Gradients ◽  
Crystalline Structures ◽  
Field Gradients ◽  
After Effect ◽  
Asymmetry Parameters ◽  
Acetyl Acetonate

Perturbed differential angular correlation measurements were performed on the 133-482 keV γ -cascade of 181 Ta in synthetic and neutron irradiated polycrystalline Hf ( AA ) 4 sources. Evidence is presented showing occurrence of different crystalline sites in the two cases. The experimental data have been treated by means of a X 2 test. Electric field gradients and asymmetry parameters are evaluated and discussed in terms of possible crystalline structures.

scholarly journals Radiative decays of scalar mesons σ(600), f 0(980) and a 0(980) in the local Nambu-Jona-Lasinio model

Open Physics ◽  
2010 ◽  
Vol 8 (4) ◽  
Author(s):  
Mikhail Volkov ◽  
Eduard Kuraev ◽  
Yury Bystritskiy
Keyword(s):  
Experimental Data ◽  
Dominant Role ◽  
Radiative Decays ◽  
Loop Contribution ◽  
Hartree Fock ◽  
Scalar Mesons ◽  
Two Photon ◽  
Photon Decay ◽  
Decay Widths ◽  
Order Of Magnitude

AbstractThe two-photon decay widths of scalar mesons σ(600), f 0(980) and a 0(980) as well a 0 → ju(ω)γ and f 0 → ju(ω)γ are calculated in the framework of the local Nambu-Jona-Lasinio model. The contributions of the quark loops (Hartree-Fock approximation) and the meson loops (next 1/N c-approximation where N c is the number of colors) are taken into account. The values of these contributions, as we show, are of the same order of magnitude. For the f 0 decay the K-loop contribution plays the dominant role. The results for two-gamma decays are in satisfactory agreement with modern experimental data. The predictions for a 0 → ju(ω)γ and f 0 → ju(ω)γ widths are given.

Lazy tree splitting

2012 ◽  
Vol 22 (4-5) ◽  
pp. 382-438 ◽  
Author(s):  
LARS BERGSTROM ◽  
MATTHEW FLUET ◽  
MIKE RAINEY ◽  
JOHN REPPY ◽  
ADAM SHAW
Keyword(s):  
Experimental Data ◽  
Binary Trees ◽  
Parallel Applications ◽  
Data Parallelism ◽  
Present Experimental Data ◽  
Nested Data ◽  
Parallel Decomposition ◽  
Binary Splitting ◽  
Parallel Loops ◽  
Parallel Arrays

AbstractNested data-parallelism (NDP) is a language mechanism that supports programming irregular parallel applications in a declarative style. In this paper, we describe the implementation of NDP in Parallel ML (PML), which is a part of the Manticore system. One of the main challenges of implementing NDP is managing the parallel decomposition of work. If we have too many small chunks of work, the overhead will be too high, but if we do not have enough chunks of work, processors will be idle. Recently, the technique of Lazy Binary Splitting was proposed to address this problem for nested parallel loops over flat arrays. We have adapted this technique to our implementation of NDP, which uses binary trees to represent parallel arrays. This new technique, which we call Lazy Tree Splitting (LTS), has the key advantage of performance robustness, i.e., it does not require tuning to get the best performance for each program. We describe the implementation of the standard NDP operations using LTS and present experimental data that demonstrate the scalability of LTS across a range of benchmarks.

NEUTRINO MIXING WITH NEW HEAVY PARTICLES IN THE SU(6)L ⊗ U(1)Y MODEL

1999 ◽  
Vol 14 (26) ◽  
pp. 4143-4152
Author(s):  
R. GAITÁN ◽  
S. RODRIGUEZ-ROMO ◽  
A. HERNÁNDEZ-GALEANA ◽  
J. M. RIVERA-REBOLLEDO
Keyword(s):  
Experimental Data ◽  
Decay Rate ◽  
Z Boson ◽  
Close Agreement ◽  
Neutrino Mixing ◽  
Heavy Particles ◽  
Ckm Matrix ◽  
Mixing Angles ◽  
Invisible Decay ◽  
The Invisible

We analyze the effects arisen from the mixing of heavy neutral fermions with the standard neutrinos in the SU (6)L ⊗ U (1)Y model. We obtain limits on the mixing angles between νe, νμ, ντ and the heavy neutral fermions of the model; these results are consistents with those predicted by using certain experimental constraints. This model also gives values for [Formula: see text], for the first row of the CKM matrix and for the invisible decay rate of the Z boson; its close agreement with the experimental data is shown. This behavior is expected since the standard neutrinos only mix with the exotic neutral leptons of the model which acquire mass in the first stage of SSB.

scholarly journals L’ontologie amazonienne: animisme ou non-essentialisme?

2019 ◽  
Author(s):  
Martin Fortier
Keyword(s):  
Experimental Data ◽  
Peruvian Amazon ◽  
New Model ◽  
Revue De La Littérature ◽  
Psychological Essentialism ◽  
Present Experimental Data ◽  
The World ◽  
Ethnographic Data ◽  
Cette Question ◽  
The Way

Titre : « L’ontologie amazonienne : animisme ou non-essentialisme ? »Résumé : Comment les populations indigènes d’Amazonie se représentent-elles les êtres du monde ? En d’autres termes, quelle est leur ontologie ? La plus récente réponse à cette question passe par la réhabilitation d’un concept ancien : l’animisme. Ce modèle de la pensée amazonienne s’est imposé dans les deux dernières décennies, et il occupe aujourd’hui une position hégémonique. Je soutiens ici que le modèle animiste de la pensée amazonienne pose de nombreux problèmes : il rend mal compte des données ethnographiques et échoue à identifier le propre de la pensée amazonienne. Si l’ontologie amazonienne n’est pas animiste, qu’est-elle alors ? Je propose un nouveau modèle selon lequel l’ontologie amazonienne est fondamentalement non essentialiste. Deux types de preuves viennent corroborer cette proposition : je propose d’abord une brève revue de la littérature ethnographique amazoniste, puis présente des données expérimentales que j’ai récemment collectées chez les Huni Kuin du Haut-Purus (Amazonie péruvienne). Je conclus en posant quelques-uns des jalons d’une vaste entreprise de comparaison des ontologies à travers le monde.Mots-clés : Amazonie, animisme, essentialisme psychologique, ethnobiologie, ethnosociologie, Huni Kuin, ontologie, perspectivisme.Title: « Amazonian ontology: animism or non-essentialism? »Abstract: How do indigenous Amazonian people conceive of the beings of the world? In other words, what is their ontology? The most recent response to this question consists in revamping an old concept: animism. Within the last two decades, this model of Amazonian thought has become increasingly influential. I contend that the animistic model of Amazonian thought is problematic in many respects: it does not do justice to ethnographic data and fails to pinpoint the uniqueness of Amazonian thought. If the Amazonian ontology cannot be characterized as animistic, what is it then? I put forth a new model according to which the Amazonian ontology is fundamentally non essentialist. Two strands of evidence corroborate this claim: first, I briefly review some of the Amazonianist ethnographic literature, and next present experimental data I recently collected among the Huni Kuin of the Upper Purus River (Peruvian Amazon). In conclusion, I pave the way for a broader endeavor of comparison of ontologies across the world.Keywords: Amazonia, animism, folkbiology, folksociology, Huni Kuin, ontology, perspectivism, psychological essentialism.

scholarly journals Study of Angular Distribution and KNO Scaling in the Collisions of 28Si with Emulsion Nuclei at 14.6A GeV

2021 ◽  
Vol 57 (12) ◽  
pp. 1205
Author(s):  
M. Ayaz Ahmad ◽  
Shafiq Ahmad
Keyword(s):  
Experimental Data ◽  
Angular Distribution ◽  
Nuclear Emulsion ◽  
Multiplicity Distribution ◽  
Heavy Ion ◽  
High Energy ◽  
Universal Function ◽  
Heavy Ion Collision ◽  
Present Experimental Data ◽  
Ion Collision

An attempt has been made to study the angular characteristics of heavy ion collision at high energy in the interactions of 28Si nuclei using with nuclear emulsion. The KNO scaling behavior in terms of the multiplicity distribution has been studied. A simplest universal function has been used to represent the present experimental data.

scholarly journals Эрозионные характеристики композитных материалов на основе меди в дуге переменной длины с поперечным продувом газа

2018 ◽  
Vol 44 (18) ◽  
pp. 3
Author(s):  
А.В. Будин ◽  
М.Э. Пинчук ◽  
Н.К. Куракина
Keyword(s):  
Experimental Data ◽  
Arc Discharge ◽  
Powder Technology ◽  
Present Experimental Data ◽  
Fixed Length ◽  
Electric Erosion ◽  
Gas Blowing ◽  
Powder Compacts ◽  
Discharge Gap ◽  
Layer Melting

AbstractWe present experimental data on the erosion of electrodes made of copper-based pseudoalloys during contact breaking at current amplitudes up to 150 kA in nitrogen at a pressure of ~2 MPa with transverse gas blowing. The electric-erosion characteristics of copper–iron pseudoalloy CuFe (85/15%) electrodes obtained by laser layer melting, as well as CuFe (70/30%) and CuW (25/75%) pseudoalloy electrodes fabricated by traditional powder technology (sintering of pressed powder compacts) are reported. The specific erosion of electrodes in variable-length arc amounts to ~1 mg/C, which somewhat exceeds the value observed for a fixed-length arc discharge gap.

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