126 research outputs found
Analysis of the system with QCD sum rules
In this article, we construct the color singlet-singlet-singlet interpolating
current with to study the
system through QCD sum rules approach. In calculations, we
consider the contributions of the vacuum condensates up to dimension-16 and
employ the formula
to choose the
optimal energy scale of the QCD spectral density. The numerical result
indicates that there exists a resonance
state lying above the threshold to saturate the QCD sum
rules. This resonance state may be found by focusing on the channel of the decay in the future.Comment: 9 pages, 4 figure
Masses and decay constants of the heavy tensor mesons with QCD sum rules
In this article, we calculate the contributions of the vacuum condensates up
to dimension-6 in the operator product expansion, study the masses and decay
constants of the heavy tensor mesons , ,
, using the QCD sum rules. The predicted masses
are in excellent agreement with the experimental data, while the ratios of the
decay constants
, where the exp denotes the experimental value.Comment: 13 pages, 13 figure
Analysis of the mass and width of the as axialvector tetraquark state
In this article, we construct both the
type and
type axialvector currents
with to study the mass of the with the QCD sum rules.
The predicted masses support assigning the to be the
type axialvector tetraquark
state. Then we study the hadronic coupling constant with the
QCD sum rules based on solid quark-hadron duality, and obtain the decay width
, which is in excellent
agreement with the experimental data 83\pm 21^{+21}_{-14} {\mbox{ MeV}} from
the LHCb collaboration.Comment: 17 pages, 5 figure
Culture-independent analysis of microflora in Gayals (Bos frontalis) feces
Comparative DNA sequence analysis of 16S/18S rRNA genes (rDNA) were undertaken to further our understanding of the make-up of micro-organisms communities in the feces of Gayals. Total DNA wereextracted from the feces of 5 Gayals. Two rDNA libraries (16S/18S rDNA) were constructed. In the 16S rDNA library, phylogenetic and sequence similarity analyses of the resultant 71 clone sequences revealed the presence of 67 operational taxonomic units (OTUs) or phylotypes and defined as having more than 97% of sequence similarity. The sequences were affiliated with the following phyla: Firmicutes (34.3%), Bacteroidetes (6.0%), Proteobacteria (4.5%), and uncultured bacteria (55.2%). A setof 58 sequences were analyzed in the 18S rDNA library, which were classified into 27 OTUs. They were mainly affiliated with the following phyla: Protozoa (25.9%), Basidiomycota (3.7%), Ascomycota (11.1%),and uncultured eukaryotes (59.3%). The sequence analysis indicated that more than half of the species, harbored in Gayals fecal belonged to the not-yet-cultured groups at 90% 16S/18S similarity levels with cultured species. In addition, micro-organisms of Chytridiomycetes was one of the most significant cellulose producing species obtained from the Gayal feces as well
- β¦