1,726,190 research outputs found
Interpretations for the X(4160) observed in the double charm production at B factories
No full textAbstractBelle Collaboration has recently observed a new state, the X(4160), in the process of double charm production e+e−→J/ψ+X(4160) followed by X(4160)→D∗D¯∗. We discuss possible interpretations for the X(4160) based on the NRQCD calculations and the potential model estimates for the charmonium spectrum. We first focus on the D-wave spin-singlet 2−+ charmonium D21(2D), which is estimated to have a small production rate of about 5% of that for e+e−→J/ψ+ηc(1S), and therefore is incompatible with the observed data for X(4160). We then discuss the possibility that the X(4160) is the known JPC=1−− charmonium state ψ(4160), which can be produced via two photon fragmentation, but the production rate is much smaller than observed for e+e−→J/ψ+X(4160). In contrast to above two possibilities, the ηc(4S) assignment is a likely one, which is supported by the observed relatively large production rate and non-observation of DD¯ decay of X(4160), but we have to understand why ηc(4S) has such a low mass, which deserves further studies. The P-wave excited state χc0(3P) is also an interesting candidate, if the observed broad peak around 3.8–3.9 GeV in the recoil mass of DD¯ against J/ψ in e++e−→J/ψ+DD¯ is due to the χc0(2P) state. Measurements of production angular distributions will be helpful to distinguish between ηc(4S) and χc0(3P) assignments. Production mechanisms in nonrelativistic QCD are emphasized
Exploring the molecular scenario of X(4160)
No full textAbstract In this work, we investigate the decays of meson X(4160) in the molecular frame. By using an effective lagrangian approach, we calculate the widths of X ( 4160 ) → J / ψ ϕ , D ∗ D ¯ ∗ , D ∗ D ¯ and D D ¯ through the triangle loop mechanism in the molecular scenario. Based on the compositeness condition, the coupling between X(4160) and the D s ∗ D ¯ s ∗ molecular state is determined. The other coupling constants used are determined phenomenologically. The calculation of the decay widths shows that the D ∗ D ¯ ∗ decay mode has a larger branching ratio. These predictions can be seen as a test for the charmonium assignment of X(4160)
Exploring the molecular scenario of X(4160)
Get PDFIn this work, we investigate the decays of meson in the molecular frame. By using an effective lagrangian approach, we calculate the widths of , , and through the triangle loop mechanism in the molecular scenario. Based on the compositeness condition, the coupling between and the molecular state is determined. The other coupling constants used are determined phenomenologically. The calculation of the decay widths shows that the decay mode has a larger branching ratio. These predictions can be seen as a test for the charmonium assignment of .9 pages,10 figure
Block Card 4160 Angola Road
No full textThis image was produced by the Auditor's Office in Lucas County, Ohio for tax assessment purposes. Associated dates are approximate. Descriptive terms related to this photograph include: Ranch houses | 4160 Angola Road (Toledo, Ohio) | Dwelling | Adams Township Area (Toledo, Ohio
The strong decays of X(3940) and X(4160)
No full textThe new mesons X(3940) and X(4160) have been found by Belle Collaboration in the processes . Considering X(3940) and X(4160) as and states, the two-body open charm OZI-allowed strong decay of and are studied by the improved Bethe–Salpeter method combined with the model. The strong decay width of is MeV, which is close to the result of X(3940); therefore, is a good candidate of X(3940). The strong decay width of is MeV, considering the errors of the results, it is close to the lower limit of X(4160). But the ratio of the decay width of is larger than the experimental data of X(4160). According to the above analysis, is not the candidate of X(4160), and more investigations of X(4160) is needed
4160. Martin Lefranc, prévôt de Lausanne
No full text4160. Martin Lefranc, prévôt de Lausanne. In: Molinier Auguste. Les Sources de l'histoire de France - Des origines aux guerres d'Italie (1494). IV. Les Valois, 1328-1461. Paris : A. Picard et fils, 1904. p. 260
Cultured neuronal cells treated with SLF HO-4160 decrease production of hydrogen peroxide.
No full text<p>MC65 cells were cultured in the presence (TC+) or absence (TC−) of tetracycline, a transgene suppressor of the APP fragment C99. In the absence of tetracycline, cells express the C99 fragment which is then further cleaved to form Aβ. Treatment with either the HO-4160 compound (+4160, 0.3 µM) or the antioxidant vitamin E (+Vit E, 100 µM) reduces the extracellular accumulation of hydrogen peroxide in cells expressing APP-C99. Error bars represent the SEM for N = 3. *p<0.05 TC− compared to both + Vit E and +4160.</p
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