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arXiv 1002.1326hep-ph
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轻子生成的有限数密度修正

Finite Number Density Corrections to Leptogenesis

Martin Beneke, Bjorn Garbrecht, Matti Herranen, Pedro Schwaller

摘要:

我们推导并求解动力学方程leptogenesis内的封闭时间路径(CTP)的形式主义。它特别强调如何熟悉的玻尔兹曼方法的过程中真正的中间态减法实现的CTP框架内,我们如何在时间无关的情况下,没有轻子不对称出现,按照CPT定理。CTP方法提供了新的量子统计校正从评估的循环积分。这导致了源于希格斯粒子玻色统计的不对称性的增强。为了量化这种影响,我们定义和评估一个有效的CP违反参数。我们还解决了动力学方程,并明确表明,新的量子统计修正可以忽略不计的强洗政权,而根据初始条件,他们可以是非常大的弱洗。

英文摘要:

We derive and solve kinetic equations for leptogenesis within the Closed Time Path (CTP) formalism. It is particularly emphasised how the procedure of real intermediate state subtraction familiar from the Boltzmann approach is realised within the CTP framework; and we show how in time-independent situations, no lepton asymmetry emerges, in accordance with the CPT-theorem. The CTP approach provides new quantum statistical corrections from evaluating the loop integrals. These lead to an enhancement of the asymmetry that is originating from the Bose statistics of the Higgs particles. To quantify this effect, we define and evaluate an effective CP-violating parameter. We also solve the kinetic equations and show explicitly that the new quantum statistical corrections can be neglected in the strong washout regime, while, depending on initial conditions, they can be very sizable for weak washout.

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