2,545 research outputs found

    Exclusive decay of Υ\Upsilon into J/ψ+χc0,1,2J/\psi+\chi_{c0,1,2}

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    We study the Υ\Upsilon exclusive decay into double charmonium, specifically, the SS-wave charmonium J/ψ J/\psi plus the PP-wave charmonium χc0,1,2\chi_{c0,1,2} in the NRQCD factorization framework. Three distinct decay mechanisms, i.e., the strong, electromagnetic and radiative decay channels are included and their interference effects are investigated. The decay processes Υ(1S,2S,3S)J/ψ+χc1,0\Upsilon(1S,2S,3S)\to J/\psi+\chi_{c1,0} are predicted to have the branching fractions of order 10610^{-6}, which should be observed in the prospective Super BB factory.Comment: 22 pages, 9 figures, 3 table

    Nonfactorizable Bχc0KB\to\chi_{c0}K decay and QCD factorization

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    We study the unexpectedly large rate for the factorization-forbidden decay Bχc0KB\to \chi_{c0}K within the QCD factorization approach. We use a non-zero gluon mass to regularize the infrared divergences in vertex corrections. The end-point singularities arising from spectator corrections are regularized and carefully estimated by the off-shellness of quarks. We find that the contributions arising from the vertex and leading-twist spectator corrections are numerically small, and the twist-3 spectator contribution with chiral enhancement and linear end-point singularity becomes dominant. With reasonable choices for the parameters, the branching ratio for Bχc0KB\to\chi_{c0}K decay is estimated to be in the range (24)×104(2-4)\times 10^{-4}, which is compatible with the Belle and BaBar data.Comment: Appendix added; it is emphasized that in the dominant twist-3 spectator corrections the end-point singularity contributions may be estimated by the off-shellness of the charm quark (by the binding energy in charmonium) and the gluon (by the transverse momentum of the light quark in the kaon

    Υ\Upsilon radiative decays to light quark jets and color octet mechanism

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    We study radiative decays of Υ\Upsilon to light quark jets in nonrelativistic QCD by taking both the color singlet and color octet bbˉb\bar b operators into consideration. The cut for quark jet energy and cut for the angle between two quark jets are introduced. The sensitivity to the soft and collinear singularities in the loop integrals are greatly reduced by these cuts. With the jet energy cut of about 1 GeV, and the jet angle cut of about 3636^\circ, the branching ratio for Υγqqˉ\Upsilon\to\gamma q\bar q is found to be 8.2×1048.2\times 10^{-4} from color singlet contributions. The color octet contributions could be much larger than that of color singlet, depending on the estimate of the color octet matrix elements. This process may provide a new test for the color octet mechanism in nonrelativistic QCD.Comment: journal version; a few references adde

    Inhibition of phosphodiesterase10A attenuates morphine-induced conditioned place preference

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    Background Phosphodiesterase (PDE) 10A is selectively expressed in medium spiny neurons of the striatum. Nucleus accumbens (NAc) is a key region that mediates drug reward and addiction-related behaviors. To investigate the potential role of PDE10A in the reinforcement properties of morphine, we tested the effect of MP-10, a selective inhibitor of PDE10A, on acquisition, expression, and extinction of morphine-induced conditioned place preference (CPP). Results The results show that 2.5 mg/kg MP-10, administered subcutaneously, significantly inhibited the acquisition of morphine-induced CPP. The same dose of MP-10 alone did not result in the CPP. Moreover, MP-10 did not alter the expression of morphine-induced CPP, but did accelerate the extinction of morphine-induced CPP. Additionally, chronic treatment with 2.5 mg/kg MP-10 decreased expression of phosphorylated CREB (pCREB), activated cAMP response element binding protein, in dorsomedial striatum, in shell of NAc, and in anterior cingulate cortex (ACC) as well as decreased expression of ΔFosB in the shell of NAc and ACC. Conclusion The results suggest that inhibition of PDE10A may have therapeutic potential in the treatment of opioid addiction

    Inhibition of phosphodiesterase10A attenuates morphine-induced conditioned place preference

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    Background: Phosphodiesterase (PDE) 10A is selectively expressed in medium spiny neurons of the striatum. Nucleus accumbens (NAc) is a key region that mediates drug reward and addiction-related behaviors. To investigate the potential role of PDE10A in the reinforcement properties of morphine, we tested the effect of MP-10, a selective inhibitor of PDE10A, on acquisition, expression, and extinction of morphine-induced conditioned place preference (CPP). Results: The results show that 2.5 mg/kg MP-10, administered subcutaneously, significantly inhibited the acquisition of morphine-induced CPP. The same dose of MP-10 alone did not result in the CPP. Moreover, MP-10 did not alter the expression of morphine-induced CPP, but did accelerate the extinction of morphine-induced CPP. Additionally, chronic treatment with 2.5 mg/kg MP-10 decreased expression of phosphorylated CREB (pCREB), activated cAMP response element binding protein, in dorsomedial striatum, in shell of NAc, and in anterior cingulate cortex (ACC) as well as decreased expression of ΔFosB in the shell of NAc and ACC. Conclusion: The results suggest that inhibition of PDE10A may have therapeutic potential in the treatment of opioid addiction

    (n,m,p)(n,m,p)-type quantum network configuration and its nonlocality

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    A quantum network shared entangled sources among distant nodes enables us to distribute entanglement along the network by suitable measurements. Network nonlocality means that it does not admit a network model involving local variables emitted from independent sources. In this work, we construct an (n,m,p)(n,m,p)-type quantum network configuration and then derive the corresponding nn-local correlation inequalities based on the assumption of independent sources. As a universal acyclic network configuration, it can cover most of the existing network models, such as the typical chain-network and star-network, and admit both centerless and asymmetric configurations. Then we demonstrate the non-nn-locality of the present network by calculating the violation of the nn-local inequality with bipartite entangled sources and Pauli measurements.Comment: 7 pages, 2 figure

    Diaqua­(5-methyl­pyrazine-2-carboxyl­ato-κ2 N 1,O)iron(II)

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    In the neutral title complex, [Fe(C6H5N2O2)2(H2O)2], the coordination geometry aound the FeII atom, which lies on an inversion centre, is distorted octa­hedral comprising two N atoms and two O atoms from two 5-methyl­pyrazine-2-carboxyl­ate ligands, and two water mol­ecules. The crystal structure is stabilized by a network of O—H⋯O hydrogen bonds, resulting in a two-dimensional supra­molecular structure
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