Hyperon threshold and stellar radii
نویسندگان
چکیده
منابع مشابه
Exchange Currents in Radiative Hyperon Decays and Hyperon Charge Radii
Radiative decays of decuplet hyperons and octet hyperon charge radii are evaluated in a chiral constituent quark model emphasizing the role of exchange currents. Exchange currents largely cancel for the M1 decay amplitudes, while they dominate the E2 amplitude. Due to the pseudoscalar meson cloud the charge radii of Σ and Ξ are almost as large as the proton radius, in agreement with recent expe...
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Context. Recent analyses of low-mass eclipsing binary stars have unveiled a significant disagreement between the observations and the predictions of stellar structure models. Results show that theoretical models underestimate the radii and overestimate the effective temperatures of low-mass stars but yield luminosities that accord with observations. A hypothesis based upon the effects of stella...
متن کاملNear-threshold production of the multistrange Xi- hyperon.
The yield for the multistrange Xi(-) hyperon has been measured in 6A GeV Au+Au collisions via reconstruction of its decay products pi(-) and Lambda, the latter also being reconstructed from its daughter tracks of pi(-) and p. The measurement is rather close to the threshold for Xi(-) production and therefore provides an important test of model predictions. The measured yield for Xi(-) and Lambd...
متن کاملHyperon production in near threshold nucleon-nucleon collisions
We study the mechanism of the associated Λ-kaon and Σ-kaon production in nucleon-nucleon collisions over an extended range of near threshold beam energies within an effective Lagrangian model, to understand the new data on pp → pΛK and pp → pΣK reactions published recently by the COSY-11 collaboration. In this theory, the hyperon production proceeds via the excitation of N∗(1650), N∗(1710), and...
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ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2018
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2018/05/038