نتایج جستجو برای: 1270
تعداد نتایج: 876 فیلتر نتایج به سال:
Decay Υ(1s) → γf2(1270) is studied by an approach in which the tensor meson, f2(1270), is strongly coupled to gluons. Besides the strong suppression of the amplitude Υ(1s) → γgg, gg → f2 by the mass of b-quark, d-wave dominance in Υ(1s) → γf2(1270) is revealed from this approach, which provides a large enhancement. The combination of these two factors leads to larger B(Υ(1s) → γf2(1270)). The d...
Using a 281 pb data sample collected at the ψ(3770) with the CLEO-c detector, we present the first absolute branching fraction measurement of the decay D → Kππeνe at a statistical significance of about 4.0 standard deviations. We find 10 candidates consistent with the decay D → Kππeνe. The probability that a background fluctuation accounts for this signal is less than 4.1 × 10. We find B(D0 → K...
Inflammatory bowel disease (IBD) is a disabling chronic inflammatory disease of the gastrointestinal tract. IBD patients have increased intestinal lymphatic vessel density and recent studies have shown that this may contribute to the resolution of IBD. However, the molecular mechanisms involved in IBD-associated lymphangiogenesis are still unclear. In this study, we established a novel inflamma...
Using a 281 pb{-1} data sample collected at the psi(3770) with the CLEO-c detector, we present the first absolute branching fraction measurement of the decay D0-->K(-)pi(+)pi(-)e(+)nu(e) at a statistical significance of about 4.0 standard deviations. We find 10 candidates consistent with the decay D0-->K(-)pi(+)pi(-)e(+)nu(e). The probability that a background fluctuation accounts for this sign...
Separating the mixture of the K1(1270) and K1(1400) states, the B → K1(1270, 1400)νν transition form factors are calculated in the three-point QCD sum rules approach. The longitudinal, transverse and total decay widths as well as the asymmetry parameter, characterizing the polarization of the axial K1(1270, 1400) and the branching ratio for these decays are evaluated. PACS numbers: 11.55.Hx, 13...
A search for direct production of C-even resonances a2(1320) and f2(1270) in e e annihilation was performed with SND detector at VEPP-2M ee collider. The upper limits of electronic widths of these mesons were obtained at 90% confidence level: Γ(a2(1320) → e e) <0.56 eV, Γ(f2(1270) → e e) <0.11 eV. PACS: 13.40.Gp; 13.65.+i; 13.85.Rm; 14.40.Cs
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