46 research outputs found
Semileptonic decay constants of octet baryons in the chiral quark-soliton model
Based on the recent study of the magnetic moments and axial constants within
the framework of the chiral quark-soliton model, we investigate the baryon
semileptonic decay constants and . Employing the
relations between the diagonal transition matrix elements and off-diagonal ones
in the vector and axial-vector channels, we obtain the ratios of baryon
semileptonic decay constants and . The ratio is also
discussed and found that the value predicted by the present model naturally
lies between that of the Skyrme model and that of the nonrelativistic quark
model. The singlet axial constant can be expressed in terms of the
ratio and in the present model and turns out to be small. The
results are compared with available experimental data and found to be in good
agreement with them. In addition, the induced pseudotensor coupling constants
are calculated, the SU(3) symmetry breaking being considered. The
results indicate that the effect of SU(3) symmetry breaking might play an
important role for some decay modes in hyperon semileptonic decay.Comment: 16 pages, RevTeX is used. No figure. Accepted for publication in
Phys. Rev.
Avaliação cintilográfica de diferentes dosagens de Tecnécio-99m na padronização da perfusão pulmonar em cães da raça Rottweiller
Neue Verantwortungsteilung und Aktivierung der Wohlfahrtsgesellschaft: Herausforderungen fĂĽr Nonprofit-Organisationen
The response of caries-free, unfilled teeth to electrical excitation: a comparison of two new pulp testers
Plagiarism in Game Programming Competitions
On June 28, 2011 the International Computer Games Association (ICGA) disqualified and banned the program RYBKA and its programmer Vasik Rajlich from previous and future World Computer Chess Championships (WCCC). The ICGA has conducted an investigation into allegations that, in the chess program RYBKA, two other programs were plagiarized: CRAFTY and FRUIT. It was found that the allegations were true, and that the ICGA tournament rules had been broken. The investigation, the report of the investigation, and the verdict that Rajlich was guilty of the plagiarism took place in the form of a version of Crowdsourced Online Dispute Resolution (CODR). The above sentence was determined by the Board of the ICGA. This article describes, amongst other things, the background, the ICGA rules, the rules for fair play in competitions, CODR, and the future of clones. Finally, in the conclusions, the question is addressed whether the application of the ICGA rules has been fair and lawful