Amsterdam

Groot, Hofstede de

doi:10.1007/978-94-015-3219-8_19

Cited by 5 publications

(7 citation statements)

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“…The spin mass (3) was introduced in the works of many authors (see [7,20,[22][23][24][25][26][27][28][29][30][31] …”

Section: Lagrangian Formulation Of the Problemmentioning

confidence: 99%

“…Since It is significant from definition of → Z α (20) it follows that a free particle does not undergo the spin perturbation of trajectory. If we assume that g = 2 (anomalous magnetic moment is absent) → Z α will coincide with the expression found by Frenkel 2 in a different way…”

Section: Spin Equations In the Frenkel Formalismmentioning

confidence: 99%

“…[20,37]) use the auxiliary condition introduced by Yu.M.Shirokov [38] 4 P α Π αβ = 0. (22) 2 In notation of Frenkel we have (see formula (22a) in Ref.…”

Section: Spin Equation In the Shirokov Formalismmentioning

confidence: 99%

“…There is a great variety of the classical methods of spin description, which are not confirmed with each other in many respects (see, for example, [20]). In this work the attempt in constructing of a correct classical spin theory was made on the basis of the general principles of classical electrodynamics.…”

Section: Introductionmentioning

confidence: 99%

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Spin-Orbital Motion and Thomas Precession in the Classical and Quantum Theories

Bordovitsyn¹,

Myagkii²

2001

Particle Physics at the Start of the New Millennium

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The motion of a magnetic spin particle in electromagnetic fields is considered on the basis of general principles of the classical relativistic theory. Alternative approaches in derivation of the equations of charge motion and spin precession, the problem of noncollinearity of the momentum and velocity of a particle with spin, the origin and the meaning of Thomas precession in dynamics of the spin particle are also considered. The correspondence principle in the spin theory is discussed.

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“…The spin mass (3) was introduced in the works of many authors (see [7,20,[22][23][24][25][26][27][28][29][30][31] …”

Section: Lagrangian Formulation Of the Problemmentioning

confidence: 99%

Section: Spin Equations In the Frenkel Formalismmentioning

confidence: 99%

“…[20,37]) use the auxiliary condition introduced by Yu.M.Shirokov [38] 4 P α Π αβ = 0. (22) 2 In notation of Frenkel we have (see formula (22a) in Ref.…”

Section: Spin Equation In the Shirokov Formalismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spin-Orbital Motion and Thomas Precession in the Classical and Quantum Theories

Bordovitsyn¹,

Myagkii²

2001

Particle Physics at the Start of the New Millennium

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“…NNs are by now well known for its ability in classifying among different distributions and are being used for this purpose in several high energy applications [9]. Some examples are Higgs search at LHC [10], b and τ analysis [11], quark and gluon jets analysis [12], determination of Z to heavy quarks branching ratios [13], or bottom jet recognition [14]. It has been shown that NNs give, after proper training, the probability that a given event belongs to some class [15] providing therefore a useful tool for classifying decisions.…”

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confidence: 99%

Enhancing the top-quark signal at Fermilab Tevatron using neural nets

1994

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We show that Neural Nets can be useful for top analysis at Tevatron. The main features of tt and background events on a mixed sample are projected in a single output, which controls the efficiency and purity of the tt signal. * This research is partly supported by EU under contract number CHRX-CT92-0004.The announced discovery of the top quark by CDF [1] at Tevatron has originated a big excitation in the scientific community. Although the statistics is too limited † to establish the existence of the top quark, it is however natural to interpret the excess of events as tt. The experimental situation will certainly improve in next months and top will hopefully be confirmed. From the theoretical point of view, the consistency of the Standard Model demands top to be the partner of the bottom quark, ensuring the absence of flavor changing neutral currents [3]. The CDF value of the top mass, m t = 174 ± 10, is consistent with recent theoretical studies on radiative corrections combined with precision measurements of the Z boson mass and the strong coupling constant at LEP leading to m t = 165The dominant top production mechanism at Tevatron is qq → tt, followed by gg → tt. Once produced, the top decays into bW , with the subsequent W → lν, qq ′ decay, in the detector. There are therefore three possible final states for the tt signal which , on increasing branching ratios, are:1. Two charged leptons, missing energy and two jets 2. One charged lepton, missing energy and four jets 3. Six jets.They need different strategies for top searches and different backgrounds have to be considered respectively. The first channel suffers from a small branching ratio and the presence of two undetected neutrinos that makes top reconstruction unfeasible. It has been analyzed in terms of the correlations among the charged leptons [5] and, recently, it has been suggested to be separable from its possible backgrounds [6]. The most investigated channel so far is the one containing one charged lepton [7]. It has a sizeable branching ratio with a moderate background. Still the neutrino escapes detection and hence the event can not be completely reconstructed. The third channel, six final jets, is the most likely and allows full top reconstruction but at expenses of a huge QCD background. Recently, it has been pointed out that tagging of a b-quark can help to obtain acceptable signal to background ratios for m t < 180 GeV [8].All mentioned channels need some specific experimental cuts for detecting jets and/or hard leptons as well as for their isolation. This, together with detector performance, implies † CDF has reported on 12 events, with 6 events for the estimated background, with a 0.26% probability of observing background fluctuation. D0 instead has not a clear signal of the top quark [2]. 2 a sensible reduction on the number of possible tt candidates, and demands a good efficiency for discerning real from fake tt background events. We propose to use Neural Nets (NNs) for the analysis of experimental data trying to maximize the s...

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Kersseboom en zijn geschriften. I

Haaften¹

1925

De Economist

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Amsterdam

Cited by 5 publications

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Spin-Orbital Motion and Thomas Precession in the Classical and Quantum Theories

Spin-Orbital Motion and Thomas Precession in the Classical and Quantum Theories

Enhancing the top-quark signal at Fermilab Tevatron using neural nets

Kersseboom en zijn geschriften. I

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