We report a measurement of the branching fraction and final-state asymmetry for the B ¯ 0 → KS0K∓π± decays. The analysis is based on a data sample of 711 fb-1 collected at the Υ ( 4S ) resonance with ...the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain a branching fraction of ( 3.60±0.33±0.15 ) ×10-6 and a final-state asymmetry of ( -8.5±8.9±0.2 ) % , where the first uncertainties are statistical and the second are systematic. Hints of peaking structures are found in the differential branching fractions measured as functions of Dalitz variables.
We report the first search for the JPC=0−− glueball in ϒ(1S) and ϒ(2S) decays with data samples of (102±2)×106 and (158±4)×106 events, respectively, collected with the Belle detector. No significant ...signals are observed in any of the proposed production modes, and the 90% credibility level upper limits on their branching fractions in ϒ(1S) and ϒ(2S) decays are obtained. The inclusive branching fractions of the ϒ(1S) and ϒ(2S) decays into final states with a χc1 are measured to be B(ϒ(1S)→χc1+anything)=(1.90±0.43(stat)±0.14(syst))×10−4 with an improved precision over prior measurements and B(ϒ(2S)→χc1+anything)=(2.24±0.44(stat)±0.20(syst))×10−4 for the first time.
Using the data sample of 711 fb−1 of ϒ(4S) on-resonance data taken by the Belle detector at the KEKB asymmetric-energy electron-positron collider, we present the first measurements of branching ...fractions of the decays B−→Λ¯c−Ξc′0, B−→Λ¯c−Ξc(2645)0, and B−→Λ¯c−Ξc(2790)0. The signal yields for these decays are extracted from the recoil mass spectrum of the system recoiling against Λ¯c− baryons in selected B− candidates. The branching fraction of B−→Λ¯c−Ξc(2790)0 is measured to be (1.1±0.4±0.2)×10−3, where the first uncertainty is statistical and the second is systematic. The 90% credibility level upper limits on B(B−→Λ¯c−Ξc′0) and B(B−→Λ¯c−Ξc(2645)0) are determined to be 6.5×10−4 and 7.9×10−4, respectively.
The potential shape memory alloy Ni(50)Mn(34)In(16) is studied with partial substitution of Mn with Fe and Cr to investigate the effect of such substitution on the martensitic transition in the ...Ni-Mn-In alloy system. The results of ac susceptibility, magnetization and electrical resistivity measurements show that while the substitution with Cr increases the martensitic transition temperature, the substitution with Fe decreases it. Possible reasons for this shift in martensitic transition are discussed. Evidence of kinetic arrest of the austenite to martensite phase transition in the Fe substituted alloys is also presented. Unlike the kinetic arrest of the austenite to martensite phase transition in the parent Ni(50)Mn(34)In(16) alloy which takes place in the presence of high external magnetic field, the kinetic arrest of the austenite to martensite phase transition in the Fe doped alloy occurs even in zero magnetic field. The Cr substituted alloys, on the other hand, show no signature of kinetic arrest of this phase transition.
We search for the JPC=0−− and 1+− light tetraquark states with masses up to 2.46 GeV/c2 in ϒ(1S) and ϒ(2S) decays with data samples of (102±2) million and (158±4) million events, respectively, ...collected with the Belle detector. No significant signals are observed in any of the studied production modes, and 90% credibility level (C.L.) upper limits on their branching fractions in ϒ(1S) and ϒ(2S) decays are obtained. The inclusive branching fractions of the ϒ(1S) and ϒ(2S) decays into final states with f1(1285) are measured to be B(ϒ(1S)→f1(1285)+anything)=(46±28(stat)±13(syst))×10−4 and B(ϒ(2S)→f1(1285)+anything)=(22±15(stat)±6.3(syst))×10−4. The measured χb2→J/ψ+anything branching fraction is measured to be (1.50±0.34(stat)±0.22(syst))×10−3, and 90% C.L. upper limits for the χb0,b1→J/ψ+anything branching fractions are found to be 2.3×10−3 and 1.1×10−3, respectively. For B(χb1→ω+anything), the branching fraction is measured to be (4.9±1.3(stat)±0.6(syst))×10−2. All results reported here are the first measurements for these modes.
Molecular cloning of trehalase gene from Drosophila melanogaster.Overexpression obtained in two different vectors and compared.Encoded protein was of 52kDa and catalytically active.In silico ...analysis revealed essential catalytic residues and their geometry.Molecular docking with substrate identified active centre of enzyme.
Trehalase, a physiologically important glycosidase is known for its crucial role in insect glycometabolism and stress recovery. The present study describes the molecular cloning of a gene fragment, encoding the catalytically active trehalase from Drosophila melanogaster (DmTre) and its heterologous expression in Escherichia coli. The 1275bp gene was overexpressed in two different vectors viz., pET28a and pCOLD TF and investigated for variable soluble expression, purification and activity of the recombinant enzyme with optimum pH and temperature of enzyme as 6 and 55°C, respectively. The sequence was characterized in silico by subjecting it to homology search, multiple sequence alignment and phylogenetic tree construction revealing its identity to other trehalases which belong to glycoside hydrolase family 37. The deduced amino acid sequence and modeled 3D structure of DmTre possessed all features of trehalase superfamily, including signature motifs and catalytic domain. The active site pocket of recombinant DmTre was compared with the crystal structure of E. coli trehalase identifying Glu424 and Asp226 as the putative catalytic residues. Additionally, enzyme-substrate docking suggests possible involvement of other residues in the catalysis along with Asp226. The present study holds significance in understanding the structural aspects of Drosophila trehalase in spite of unavailabilty of eukaryotic trehalase crystal structure.
We report a measurement of the branching fractions of the decays B→D(*)πℓv. The analysis uses 772×106 $B\overline{B}$ pairs produced in e+e-→Y(4S) data recorded by the Belle experiment at the KEKB ...asymmetric-energy e+e- collider. The tagging B meson in the decay is fully reconstructed in a hadronic decay mode. On the signal side, we reconstruct the decay B→D(*)πℓv(l=e,μ). The measured branching fractions are B(B+→D-π+ℓ+v) = 4.55±0.27 (stat.)±0.39 (syst.)×10-3, B(B0→$\overline{D}$0π-ℓ+ν)=4.05±0.36 (stat.)±0.41 (syst.)×10-3, B(B+→D*-π+ℓ+ν)=6.03±0.43 (stat.)±0.38 (syst.)×10-3, and B(B0→$\overline{D}$*0π-ℓ+ν)=6.46±0.53 (stat.)±0.52 (syst.)×10-3. These are in good agreement with the current world-average values.
We report a search for the charmless baryonic decay B0 → p p ¯ π0 with a data sample corresponding to an integrated luminosity of 711fb–1 containing ( 772±10 ) ×106 B B ¯ pairs. The data were ...collected by the Belle experiment running on the Υ ( 4S ) resonance at the KEKB e+e– collider. We measure a branching fraction B ( B0 → p p ¯ π0 ) = ( 5.0±1.8±0.6 ) ×10–7 , where the first uncertainty is statistical and the second is systematic. The signal has a significance of 3.1 standard deviations and constitutes the first evidence for this decay mode. We also search for the intermediate two-body decays B0 → Δ + p ¯ and B0 → Δ ¯ –p , and set an upper limit on the branching fraction, B ( B0 → Δ + p ¯ ) + B ( B0 → Δ ¯ –p ) <1.6×10–6 at 90% confidence level.
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