Escola(s) do Alentejo: um mapa do que se aprende no Sul de Portugal

Nico, Bravo; Nico, Lurdes Pratas; Ferreira, Fernando; Tobias, Antónia

doi:10.5935/978-989-8449-14-6.2016b001

Cited by 4 publications

(6 citation statements)

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“…The ep double coincidence counting rate in that experiment was 20 s −1 for a quoted neutron flux density of 1.1×10 8 cm −2 s −1 [30]. Noting that the total available neutron rate at the NG-6 end station at NIST is actually some 20 times larger [30], then in one week of running time with ω min = 0.3 MeV one could have a statistical error on the asymmetry of ∼ 7×10 −3 . Both the incident flux and the usable beam size are projected to be significantly larger in the planned New Guide Hall [30]; the estimated statistical reach on the asymmetry could then approach ∼ 1 × 10 −3 .…”

Section: Isolating a Pcs Interaction In Neutron Radiative β-Decaymentioning

confidence: 92%

“…To estimate the ability to detect an asymmetry we consider the counting rates from the neutron radiative β-decay experiment at NIST [28,29]. The ep double coincidence counting rate in that experiment was 20 s −1 for a quoted neutron flux density of 1.1×10 8 cm −2 s −1 [30]. Noting that the total available neutron rate at the NG-6 end station at NIST is actually some 20 times larger [30], then in one week of running time with ω min = 0.3 MeV one could have a statistical error on the asymmetry of ∼ 7×10 −3 .…”

Section: Isolating a Pcs Interaction In Neutron Radiative β-Decaymentioning

confidence: 99%

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Tracing Remnants of the Baryon Vector Current Anomaly in Neutron Radiative β-Decay

Gardner

2011

Physics Procedia

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We show that a triple-product correlation in the neutron radiative β-decay rate, characterized by the kinematical variable η ≡ (l e × l ν ) · k, where n(p) → p(p ) + e − (l e ) + ν e (l ν ) + γ(k), isolates the pseudo-Chern-Simons term found by Harvey, Hill, and Hill as a consequence of the baryon vector current anomaly and SU(2) L ×U(1) Y gauge invariance at low energies. The correlation appears if the imaginary part of the coupling constant is nonzero, so that its observation at anticipated levels of sensitivity would reflect the presence of sources of CP violation beyond the Standard Model. We compute the size of the asymmetry in n → pe −ν e γ decay as a function of the coupling, estimate the effect of Standard-Model final-state interactions, and discuss the role nuclear processes can play in discovering the effect. IntroductionHarvey, Hill, and Hill have found that unexpected interactions involving the nucleon N, photon γ, and weak gauge bosons at low energies emerge from gauging the axial anomaly of QCD under the full electroweak symmetry of the Standard Model (SM) [1,2]. In this contribution we consider how such interactions can be isolated through a triple-product momentum correlation in neutron radiative β-decay. The correlation is both parity-and naively timereversal-odd, so that it vanishes in the Standard Model save for effects induced by final-state interactions (FSI). Nevertheless, the correlation can be generated by sources of CP violation beyond the Standard Model, and such couplings, being spin-independent, are not constrained by the nonobservation of the neutron electric dipole moment (EDM). We consider the sorts of limits on its strength which can be determined at existing and anticipated facilities, as well as the size of induced correlations from known FSI. We also briefly consider the possibility of nuclear β-decay studies as well as the prospects for muon-induced reaction studies. Anomalous interactions at low energiesThe study of the low-energy spectrum of quantum chromodynamics (QCD) reveals light, pseudoscalar mesons which we interpret as the Nambu-Goldstone bosons of a spontaneously broken chiral symmetry, so that in two-flavor QCD, e.g., SU(2) L ×SU(2) R → SU(2) V [3,4]. A chiral theory of mesons built on this symmetry is incomplete; the explicit inclusion of the axial anomaly, vis-a-vis the Wess-Zumino-Witten (WZW) term [5,6], is required in order to describe observed processes such as KK → 3π and π 0 → γγ [7]. The latter reflects the nonconservation of the axial current and hence the presence of the axial anomaly [8,9]. If we study the gauge invariance of the WZW term in

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Section: Isolating a Pcs Interaction In Neutron Radiative β-Decaymentioning

confidence: 92%

Section: Isolating a Pcs Interaction In Neutron Radiative β-Decaymentioning

confidence: 99%

Tracing Remnants of the Baryon Vector Current Anomaly in Neutron Radiative β-Decay

Gardner

2011

Physics Procedia

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“…In [20] and [21], it is proposed that the communication solution for the Smart Grid is an IP-based network supported by optical fibers. Table II indicates the typical values of delay and bandwidth recommended in the data transmission of the most important applications of the Smart Grid [22].…”

Section: Routingmentioning

confidence: 99%

Study of IPv6 Protocol in the Data Model of the Smart Grid Distribution Domain

Muñoz

Guerrero

2020

ing. Solidar

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Introduction: This article is the product of the research “Study of the IPv6 Protocol in the data model of the Smart Grid distribution domain” developed at the Universidad del Valle and carried out during 2019. Problem: There is an immediate need to establish standards and protocols for the Smart Grid for both the electrical components and the component technologies of information and communication. Objective: The objective of the research is to characterize the use of IPv6 in the context of the communications domain distribution of the Smart Grid. Methodology: The work defines a virtualization environment in which the performance of IPv6 in the domain distribution of the Smart Grid will be evaluated; this evaluation includes measurement and analysis of delays as well as traffic volumes, bandwidth, cyber-security conditions, and time allocation of network addresses. Results: The IPv6 protocol is considered as a viable alternative in the Smart Grid communication model in order to comply with the communication requirements. Conclusion: The implementation of Quality of Service QoS in IPv6 defined in RFC2474 is essential in the Smart Grid communication network in order to meet the communication requirements of the defined applications. Originality: There is great expectation that networks based on the Internet Protocol will serve as a key element for communications within the Smart Grid. Limitations: The wide scope and dimensions involving Smart Grids, it is almost impossible to implement the communication network of a Smart Grid completely in a single simulation tool or emulation.

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“…Noting that the total available neutron rate at the NG-6 end station at NIST is actually some 20 times larger [30], then in one week of running time with ω min = 0.3 MeV one could have a statistical error on the asymmetry of ∼ 7×10 −3 . Both the incident flux and the usable beam size are projected to be significantly larger in the planned New Guide Hall [30]; the estimated statistical reach on the asymmetry could then approach ∼ 1 × 10 −3 . Although the neutron measurements would probe regions of model parameter space which are unconstrained by other data, it is prudent to consider the triple-product momentum correlation in nuclear radiative β-decays as well.…”

Section: Isolating a Pcs Interaction In Neutron Radiative β-Decaymentioning

confidence: 99%

Tracing remnants of the baryon vector current anomaly in neutron radiative -decay

Gardner¹,

He²

2012

AIP Conference Proceedings

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We show that a triple-product correlation in the neutron radiative β-decay rate, characterized by the kinematicalisolates the pseudo-Chern-Simons term found by Harvey, Hill, and Hill as a consequence of the baryon vector current anomaly and SU(2) L ×U(1) Y gauge invariance at low energies. The correlation appears if the imaginary part of the coupling constant is nonzero, so that its observation at anticipated levels of sensitivity would reflect the presence of sources of CP violation beyond the Standard Model. We compute the size of the asymmetry in n → pe −ν e γ decay as a function of the coupling, estimate the effect of Standard-Model final-state interactions, and discuss the role nuclear processes can play in discovering the effect.

show abstract

Escola(s) do Alentejo: um mapa do que se aprende no Sul de Portugal

Cited by 4 publications

References 0 publications

Tracing Remnants of the Baryon Vector Current Anomaly in Neutron Radiative β-Decay

Tracing Remnants of the Baryon Vector Current Anomaly in Neutron Radiative β-Decay

Study of IPv6 Protocol in the Data Model of the Smart Grid Distribution Domain

Tracing remnants of the baryon vector current anomaly in neutron radiative -decay

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