An Approach to the Non-Leptonic Decays of Hyperons

Maki, Ziro; Nakagawa, Masami

doi:10.1143/ptp.31.115

Cited by 10 publications

(15 citation statements)

References 5 publications

(6 reference statements)

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“…The latter regime is realized when the concentration of the impurities is large enough to eliminate the gap but not large enough to destroy superconductivity altogether. Not long after the work of Abrikosov and Gor'kov, it was recognized that other de-pairing mechanisms, such as those involving the coupling of the orbital and spin degrees of freedom of the electrons to a magnetic field, can lead to equivalent suppressions of superconductivity, including gapless regimes [2][3][4][5].…”

mentioning

confidence: 99%

“…The vector potential (due to the applied field) scrambles the relative phases of the partners of a Cooper pair, as they move diffusively in the presence of impurity scattering (viz. the orbital effect), which suppresses superconductivity [2,3]. On the other hand, the field polarizes the magnetic impurity spins, which decreases the rate of exchange scattering (because the spin-flip term is suppressed more strongly than the non-spin-flip term is enhanced), thus diminishing this contribution to depairing [7].…”

mentioning

confidence: 99%

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Enhancing superconductivity: Magnetic impurities and their quenching by magnetic fields

Wei¹,

Pekker²,

Rogachev³

et al. 2006

Europhys. Lett.

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Abstract. -Magnetic fields and magnetic impurities are each known to suppress superconductivity. However, as the field quenches (i.e. polarizes) the impurities, rich consequences, including field-enhanced superconductivity, can emerge when both effects are present. For the case of superconducting wires and thin films, this field-spin interplay is investigated via the Eilenberger-Usadel scheme. Non-monotonic dependence of the critical current on the field (and therefore field-enhanced superconductivity) is found to be possible, even in parameter regimes in which the critical temperature decreases monotonically with increasing field. The present work complements that of Kharitonov and Feigel'man, which predicts non-monotonic behavior of the critical temperature.

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confidence: 99%

mentioning

confidence: 99%

Enhancing superconductivity: Magnetic impurities and their quenching by magnetic fields

Wei¹,

Pekker²,

Rogachev³

et al. 2006

Europhys. Lett.

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“…We get a not inconsistent value It is, however, not conclusive which of them is nearer to the true value. If we take another value for fK 2 , fK 2 =5 X 10-11 , suggested by some authors, 8 ) w(tr~3°n-) becomes too large. It may be possible that the rate is reduced owing to the interference of matrix elements, if the Q-3*-transition is included.…”

Section: Suzuhmentioning

confidence: 97%

Pole Approximation to the Decays of the - Particle ( =1680 MeV)

Suzuki

1964

Progress of Theoretical Physics

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“…4 ) It may also be possible to take a viewpoint that I ..dll = 1/2 rule serves as a suitable clue to inquire into unknown dynamics govering interactions among hadrons which are complex composite systems. 5 ) In this paper, however, we will take the standpoint that the charged-current picture cannot describe nonleptonic processes sufficiently, and the I ..dll = 1/2 enhancement directly reflects some fundamental character of the weak interaction. In §2, phenomenological analyses which are based on the current-current picture of the weak interaction are made in order to get a conclusion favorable to this standpoint.…”

Section: · 2 Some Defects Of Current-current J>icture Of Weak Intermentioning

confidence: 99%

Current-Current Interaction and Nonleptonic Decays of Hyperons

et al. 1965

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Under the assumption that the charge:] vector mesons W as intermediaries of weak interactions exist, the following problems are considered: (a) Is it possible to understand in a unified way the universality of weak coupling constants, the charged current-current picture of weak interactions and the I JII = l/2 enhancement of nonleptonic decays ? (b) How can we understand the distinctive character of W?A possible answer to the problems seems to be obtained if one considers the problems by standing on a "genetical" vievvpoint of elementary particles (such as the Nagoya model). ln order to answer to these problems from this viewpoint, a model of the W-meson is proposed on the basis of the quartet model, and on the same basis the semi-weak two-body interactions are introduced, which are expected to play a main role (i.e. to lead the I Lil\ = l/2 enhancement) in nonleptonic interactions. In this model, 1V' -mesons are assumed to be composed of strongly correLl ted R~ and B,. Thus, the peculiarity of 1V-mesons will be understood in intimate connection with that of B-matters. The weak interaction is generated from some kind of primordial charge-exchange process between a lepton and B-matter. In the J,')'=O noaleptonic transitions, amplitudes with t1l -~ () are much larger than amplitudes with \.d I I = 1. Even number of vV-mesons expected to interact strongly; therefore, multiple lepton-production should occur in super high energies. It is investigated whether the picture similar to that of the proposed model is applicable to other models of elementary particles in order to see the quartet model is more preferable than the quark model and Bacry-Nuyts-Van Hove model. Even if the latter models are modified along the spirit of Nagoya model, the essential picture of the present model is not applicable to the quark model, and in Bacry-Nuyts-Van Hove model one fails to obtain the ) .d1i ~-1 1 :2 enhancement. § 1. Introduction 1·1. Proposal of problemsLow-energy processes of weak interactions with leptons are known to be well governed by the following selection rules :(1) The interactions are of ( V, A) type.(2) Half of leptons participating in the weak process are neutrinos, These rules are usually expressed by writing the weak interaction as the currentcurrent type, where the current is a charged one and of ( V, ./1) type. Many authors (S. Ogawa and others) l) have searched for a substantialistic basis of these at Kainan University on March 11, 2015 http://ptp.oxfordjournals.org/ Downloaded from *) B. d'Espagnat (Rochester Conf., 1960, p. 589) has discussed the possibility that one can get the \ L1 I\ = 1/2 rule with charged in tenneclia te bosons only. But, leptonic processes with I L1 S I = 2 occur in the first order of weak interactions.

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An Approach to the Non-Leptonic Decays of Hyperons

Cited by 10 publications

References 5 publications

Enhancing superconductivity: Magnetic impurities and their quenching by magnetic fields

Enhancing superconductivity: Magnetic impurities and their quenching by magnetic fields

Pole Approximation to the Decays of the - Particle ( =1680 MeV)

Current-Current Interaction and Nonleptonic Decays of Hyperons

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