Weak Electromagnetic Decays of Hyperons in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>SU</mml:mi><mml:mo>(</mml:mo><mml:mn>3</mml:mn><mml:mo>)</mml:mo><mml:mn /></mml:math>

Graham, R. H.; Pakvasa, Sandip

doi:10.1103/physrev.140.b1144

Cited by 70 publications

(12 citation statements)

References 25 publications

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“…We now turn to the derivation of the hyperon-nucleon transition in the factorization approach. The hyperon-nucleon transition was studied in the context of the nonleptonic hyperon decay [65,92,[162][163][164][165][166][167][168][169][170][171][172][173][174]. The general form of the hyperon-nucleon transition lagrangian relevant in this work is given by…”

Section: Hyperon-nucleon Transitionmentioning

confidence: 99%

Standard model contribution to the electric dipole moment of the deuteron, 3H, and 3He nuclei

Yamanaka

Hiyama

2016

J. High Energ. Phys.

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We calculate for the first time the electric dipole moment (EDM) of the deuteron, 3 H, and 3 He nuclei generated by the one-meson exchange CP-odd nuclear force in the standard model. The effective |∆S| = 1 four-quark operators are matched to the |∆S| = 1 standard model processes involving the CP phase of the Cabibbo-KobayashiMaskawa matrix at the electroweak scale and run down to the hadronic scale µ = 1 GeV according to the renormalization group evolution in the next-to-leading logarithmic order. At the hadronic scale, the hadron matrix elements are modeled in the factorization approach. We then obtain the one-meson (pion, eta meson, and kaon) exchange CP-odd nuclear force, which is the combination of the |∆S| = 1 meson-baryon vertices which issue from the penguin operator and the hyperon-nucleon transition. From this CP-odd nuclear force, the nuclear EDM is calculated with the realistic Argonne v18 interaction and the CP-odd nuclear force using the Gaussian expansion method. It is found that the EDMs of light nuclear systems are of order O(10 −31 )e cm. We also estimate the standard model contribution to other hadronic CP violating observables such as the EDMs of 6 Li, 9 Be nuclei, and the atomic EDMs of 129 Xe, 199 Hg, 211 Rn, and 225 Ra generated through the nuclear Schiff moment. We then analyze the source of theoretical uncertainties and show some possible ways to overcome them.

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Section: Hyperon-nucleon Transitionmentioning

confidence: 99%

Standard model contribution to the electric dipole moment of the deuteron, 3H, and 3He nuclei

Yamanaka

Hiyama

2016

J. High Energ. Phys.

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“…Weak radiative hyperon decays (WRHD), such as Λ → nγ, Σ + → pγ, etc., have been of theoretical and experimental interest for some time. Early theoretical work on these decays focused on pole models, in which the initial baryon turns into an intermediate state by a ∆S = 1 weak transition, followed by the decay of the intermediate state by the radiation of a photon [1] [2]. The limited success of pole models for WRHD led to a variety of other approaches.…”

Section: Introductionmentioning

confidence: 99%

Weak radiative hyperon decays in chiral perturbation theory

et al. 1993

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“…Our experimental result for a is two standard deviations from the SU(3) result. Some authors 10,11 have made dynamical calculations of the asymmetry parameter and branching ratio, using pole-model and current-algebra techniques. Only Ahmed obtains results in good agreement with this experiment for both the asymmetry parameter and branching ratio; the others obtain small asymmetry parameters.…”

Section: Theoretical Descriptionmentioning

confidence: 99%

Asymmetry Parameter and Branching Ratio ofΣ+→pγ

et al. 1969

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E 7 interval over which the fit is carried out, the cross sections p7r + 7r~ir 0 , whereA N exposure of 1.3X10 6 pictures in the Berkeley 25-in. hydrogen bubble chamber yielded about 57 000 events of the type #-/>-> S+TT-, 2+->^ + neutral, with K~ momenta ranging from 270 to 470 MeV/c. The vast majority of the events were near 390 MeV/c, where the F 0 *(1520) resonance is formed. Of the 48 000 measured events, we were able to identify 61 events of the decay S + -»py.The problem in the experiment was to separate the rare 2+ -> py decays from the more copious X + -> pir 0 decays. 1 The proton momentum in the rest frame of the 2 is 189.0 MeV/c for 2+ -* pir° and 224.6 MeVA for 2+->py. Bazin et al. 2 found a branching ratio of (3.7±0.8)X10~3, using only events with stopped protons. For such events the proton momentum is determined from range rather than curvature, and is thus very accurately known, so that the two decay modes are almost always distinguishable.

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Weak Electromagnetic Decays of Hyperons inSU(3)

Cited by 70 publications

References 25 publications

Standard model contribution to the electric dipole moment of the deuteron, 3H, and 3He nuclei

Standard model contribution to the electric dipole moment of the deuteron, 3H, and 3He nuclei

Weak radiative hyperon decays in chiral perturbation theory

Asymmetry Parameter and Branching Ratio ofΣ+→pγ

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