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首页> 外文期刊>The European Physical Journal, A. Hadrons and Nuclei >Exclusive photoproduction of charmed D* vector mesons, gamma+N -> Y-c+(D)over-bar*, Y-c = Lambda(+)(c) or Sigma(c)
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Exclusive photoproduction of charmed D* vector mesons, gamma+N -> Y-c+(D)over-bar*, Y-c = Lambda(+)(c) or Sigma(c)

机译:迷人的D *矢量介子,γ+ N-> Y-c +(D)跨栏*,Y-c = Lambda(+)(c)或Sigma(c)的独家照片制作

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摘要

The spin structure of the matrix element for the reactions gamma + N --> Y-c + D*, where Y-c = Lambda(c)(+)(2285), Sigma(c)(2455) are charmed baryons with spin 1/2, and D*(2010) is the vector charmed meson, can be parametrized, in collinear regime, in terms of three independent scalar amplitudes, which are functions of the photon energy E-gamma, only. In the framework of an effective Lagrangian approach generalized to charm photoproduction, we calculate the energy dependence of the differential cross-section, the density matrix element of (D) over bar*, rho(11), the asymmetry A(z) in the collision of circularly polarized photons with polarized nucleons, and the polarization of the produced Y-c-hyperon, P-z, in the collision of circularly polarized photons with unpolarized target. All these polarization observables either vanish or are large, in absolute value, with a smooth E-gamma-dependence, and differ for Lambda(c)(+) and Sigma(c) production.
机译:反应γ+ N-> Yc + D *的矩阵元素的自旋结构,其中Yc = Lambda(c)(+)(2285),Sigma(c)(2455)是自旋1/2的有魅力重子,D *(2010)是有矢量的介子,可以在共线状态下根据三个独立的标量幅度进行参数化,三个标量幅度仅是光子能量E-γ的函数。在推广到迷人的光产生的有效拉格朗日方法的框架中,我们计算了微分截面的能量依赖性,bar *上的(D)的密度矩阵元素,rho(11),其中的不对称性A(z)。圆极化光子与非极化靶的碰撞中,圆极化光子与极化核子的碰撞以及产生的Yc-超子Pz的极化。所有这些偏振可观察物或者消失,或者绝对值都很大,具有平滑的E-γ依赖性,并且对于Lambda(c)(+)和Sigma(c)的生产而有所不同。

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