881,445 research outputs found
Calculation of the pentaquark width by QCD sum rule
The pentaquark width is calculated in QCD sum rules. Result for
show, that can vary in the region less than
1. The main conclusion is, that if pentaquark is genuine states then sum
rules really predict the narrow width of pentaquark , and the
suppression of the width is both parametrical and numerical.Comment: 8 Ppages, 3 figures,the numerical error was corrected, two figures
are modified. In the limit of errors the result did not change significantl
Nuclear-spin-dependent parity nonconservation in s-d_5/2 and s-d_3/2 transitions
We perform calculations of s-d_5/2 nuclear-spin-dependent parity
nonconservation amplitudes for Rb, Cs, Ba+, Yb+, Fr, Ra+ and Ac++. These
systems prove to be good candidates for the use in atomic experiments to
extract the so-called anapole moment, a P-odd T-even nuclear moment important
for the study of parity violating nuclear forces. We also extend our previous
works by calculating the missed spin-dependent amplitudes for the s-d_3/2
transitions in the above systems.Comment: 8 page
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