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arXiv 0905.2022hep-ph
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MSSM中的电弱相变、临界气泡和闪锌矿退耦条件

Electroweak phase transition, critical bubbles and sphaleron decoupling condition in the MSSM

Koichi Funakubo, Eibun Senaha

摘要:

结合最新的实验数据,重新讨论了MSSM中的电弱相变和闪锌矿退耦条件。在电弱重子生成的背景下,考虑了轻希格斯玻色子玻色子和普通的退耦极限,并根据CP-奇希格斯玻色子玻色子和Z玻色子质量的相对大小对它们进行了分类.我们不仅研究了有效势具有两个简并极小值的临界温度下的v/T,而且还研究了临界泡的成核温度下的v/T,其中v是希格斯玻色子的真空期望值,T是温度。结果表明,在成核温度下的V/T比在临界温度下的V/T提高了约10%。我们还评估了散斑脱耦条件,包括散斑周围涨落的零模因子。观察到在典型的参数组中,在形核温度下的sphaleron退耦条件由v/T>1.38给出。在任何唯象允许的区域,临界温度和成核温度下的v/T都不能大到足以满足这样的sphaleron解耦条件。

英文摘要:

The electroweak phase transition and the sphaleron decoupling condition in the MSSM are revisited taking the latest experimental data into account. The light Higgs boson scenario and the ordinary decoupling limit which are classified by the relative size between the CP-odd Higgs boson mass and Z boson mass are considered within the context of electroweak baryogenesis. We investigate v/T at not only the critical temperature at which the effective potential has two degenerate minima but also the nucleation temperature of the critical bubbles, where v is a vacuum expectation value of the Higgs boson and T denotes a temperature. It is found that v/T at the nucleation temperature can be enhanced by about 10% compared to that at the critical temperature. We also evaluate the sphaleron decoupling condition including the zero mode factors of the fluctuations around sphaleron. It is observed that the sphaleron decoupling condition at the nucleation temperature is given by v/T>1.38 for the typical parameter sets. In any phenomenologically allowed region, v/T at both the critical and nucleation temperatures cannot be large enough to satisfy such a sphaleron decoupling condition.

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