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 $(f_1,f_2)$ and $(g_1, g_2)$. 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 $f_2/f_1$ and $g_1/f_1$. The $F/D$ 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 $g^{(0)}_A$ can be expressed in terms of the $F/D$ ratio and $g^{(3)}_A$ 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 $g_2/f_1$ 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.

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