Large 2HDM(II) one-loop corrections in leptonic tau decays

被引：59

作者：

Krawczyk, M

Temes, D

机构：

[1] Univ Warsaw, Inst Theoret Phys, PL-00681 Warsaw, Poland

[2] Lab Phys Theor LAPTH, F-74941 Annecy Le Vieux, France

来源：

EUROPEAN PHYSICAL JOURNAL C | 2005年 / 44卷 / 03期

关键词：

D O I：

10.1140/epjc/s2005-02370-2

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The one-loop contributions to the branching ratios for leptonic tau decays are calculated in the CP-conserving 2HDM(II). The analysis is focused on large tan beta enhanced contributions. We found that these contributions, involving loops with both neutral and charged Higgs bosons, dominate over the tree-level H-+/- exchange, the latter one being totally negligible for the decay into c. We derive a simple analytical expression for the one-loop contribution which holds in the large tan beta case. We show that the leptonic branching ratios Of T are complementary to the Higgsstrahlung processes for h(H) and have a large potential in constraining the parameters of the model. In this work we provide upper limits on the Yukawa couplings for both light h and light A scenarios, and we derive a new lower limit on the mass of H-+/- as a function of tan,8 which differs significantly from what was considered as a standard constraint based on the tree-level H-+/- exchange only. Interestingly we also obtain an upper limit on M-H +/-.

引用

页码：435 / 446

页数：12

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