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An effective chiral theory of large NC QCD of mesons has been applied to study the form factor of πγγ∗. Besides the poles of vector mesons an intrinsic form factor is found. The slope of the form factor is predicted. The effect of the current quark masses on the decay rate is calculated. There is no adjustable parameter in this study.
با وجود اینکه تیمور بنیانگذار حکومت تیموریان پیروزی های درخشانی در جبهه های نظامی کسب کرد، ولی هرگز در صدد ایجاد مبانی مشروعیت مستقل از مغولان برنیامد.این راهبرد که در عهد جانشینان او نیز ادامه پیدا کرد، سیاست خارجی تیموریان را در روابط با مغولان منفعل نمود.بدین ترتیب آنان در برخورد با شاخه های مختلف مغول که در مرزهای شرقی و شمالی آن می زیستند، راه مصالحه و کم تنشی را پیمودند و هرگز درصدد براند...
An alkane-degrading, sulfate-reducing bacterial strain, AK-01, isolated from a petroleum-contaminated sediment was studied to elucidate its mechanism of alkane metabolism. Total cellular fatty acids of AK-01 were predominantly C even when it was grown on C-even alkanes and were predominantly C odd when grown on C-odd alkanes, suggesting that the bacterium anaerobically oxidizes alkanes to fatty...
A Gram-stain-positive, rod-shaped, non-endospore-forming, orange-pigmented (coloured) actinobacterium (01-Je-003(T)) was isolated from the wall of an indoor environment primarily colonized with moulds. On the basis of 16S rRNA gene sequence similarity studies, strain 01-Je-003(T) was shown to belong to the genus Brevibacterium and was most similar to the type strains of Brevibacterium picturae ...
In this work, the structural and magnetic properties of LaMn1-xCoxO3 (x = 0.00, 0.25, 0.50, 0.75, 1.00) are investigated. The structural characterization of compounds by X-ray powder diffraction is evidence for a rhombohedral structure (R -3c space group). Much less increase of the unit cell volume suggests that Co enters in lattice as Co+2 for x ≤ 0.5 while much more decrease of the unit cell ...
Epidemiological studies have identified increased colorectal cancer (CRC) risk with high red meat (HRM) intakes, whereas dietary fibre intake appears to be protective. In the present study, we examined whether a HRM diet increased rectal O-methyl-2-deoxyguanosine (OMeG) adduct levels in healthy human subjects, and whether butyrylated high-amylose maize starch (HAMSB) was protective. A group of ...
The ANTARES deep-sea neutrino telescope comprises a three-dimensional array of photomultipliers to detect the Cherenkov light induced by upgoing relativistic charged particles originating from neutrino interactions in the vicinity of the detector. The large scattering length of light in the deep sea facilitates an angular resolution of a few tenths of a degree for neutrino energies exceeding 10...
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