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arXiv 1102.5594hep-ph
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用破缺SU(3)模型研究矢量介子碎裂

Study of vector meson fragmentation using a broken SU(3) model

D. Indumathi, H. Saveetha

摘要:

研究了e^+ e^-湮灭过程中的包含强子产生,以研究碎裂过程。利用SU(3)破缺模型,通过引入SU(3)破缺参数λ,用简单的方法确定了八重态矢量介子的夸克和胶子碎裂函数ρ和K^*。这些可以用两个轻夸克碎裂函数V(x,Q2)和γ(x,Q2)以及胶子碎裂函数Dg(x,Q2)来表示。这些函数在Q0^2 = 1.5 GeV 2的低输入标度下进行参数化,通过LO DGvector演化(包括适当阈值下的魅力和底味)进行演化,并通过与Z极数据的比较进行拟合。该模型扩展了一些额外的参数的引入,包括单重态-八重态混合的研究,因此ω和ω的碎裂。当x >~ 0.01时,模型与现有数据拟合良好,其中x是强子的标度能量。该模型成功地应用于相对论重离子对撞机(RHIC)pp碰撞中的ω,π产生,这些数据为RHIC和LHC重核碰撞中夸克-胶子等离子体的研究提供了重要的基础.

英文摘要:

Inclusive hadro production in e^+ e^- annihilation processes is examined to study the fragmentation process. A broken SU(3) model is used to determine the quark and gluon fragmentation functions of octet vector mesons, ρand K^*, in a simple way with an SU(3) breaking parameter λ. These are expressed in terms of just two light quark fragmentation functions, V(x, Q2) and γ(x, Q2) and the gluon fragmentation function Dg(x, Q2). These functions are parameterized at the low input scale of Q0^2 = 1.5 GeV2, evolved through LO DGLAP evolution including charm and bottom flavour at appropriate thresholds, and fitted by comparison with data at the Z-pole. The model is extended with the introduction of a few additional parameters to include a study of singlet--octet mixing and hence ωand ϕfragmentation. The model gives good fits to the available data for x >~ 0.01, where x is the scaled energy of the hadron. The model is then applied successfully to ω, ϕproduction in pp collisions at the Relativistic Heavy Ion Collider, RHIC; these data form an important base-line for the study of Quark Gluon Plasma in heavy nucleus collisions at RHIC, and also in future at the LHC.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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