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arXiv 0903.0111nucl-thhep-phnucl-ex
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Femtoscopy中的库仑效应

Coulomb Effects in Femtoscopy

Radoslaw Maj, Stanislaw Mrowczynski

摘要:

计算了两个全同粒子--π介子或K介子--通过库仑势相互作用的关联函数。粒子是从各向异性粒子的有限寿命源发射的。在π介子的情况下,考虑晕的影响作为一个额外的粒子的大的空间扩展的来源。详细讨论了相对论效应。仔细测试的Bowler-Sinyukov程序,以消除库仑相互作用。在没有晕的情况下,该程序被证明工作得很好,即使是一个非常各向异性的源。当考虑晕时,用Bowler-Sinyukov方法提取的自由关联函数在相对动量较小时发生畸变,但仍能正确地再现源参数。

英文摘要:

The correlation function of two identical particles - pions or kaons - interacting via Coulomb potential is computed. The particles are emitted from an anisotropic particle's source of finite lifetime. In the case of pions, the effect of halo is taken into account as an additional particle's source of large spatial extension. The relativistic effects are discussed in detail. The Bowler-Sinyukov procedure to remove the Coulomb interaction is carefully tested. In the absence of halo the procedure is shown to work very well even for an extremely anisotropic source. When the halo is taken into account the free correlation function, which is extracted by means of the Bowler-Sinyukov procedure, is distorted at small relative momenta but the source parameters are still correctly reproduced.

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