Constraints on the Universal Varying Yukawa Couplings: from SM-like to Fermiophobic

Details Constraints on the Universal Varying Yukawa Couplings: from SM-like to Fermiophobic Constraints on the Universal Varying Yukawa Couplings: from SM-like to Fermiophobic

2012-03-22

arxiv.org/abs/1203.5083v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 6 figures, 2 tables

Scientific paper

Varying the Standard Model (SM) fermion Yukawa couplings universally by a generic scale factor ($F_{Yu}$), we study the phenomenological fit to the current available experimental results for the Higgs boson search at hadron colliders. We point out that the Higgs production cross section and its decay branching ratio to $\gamma\gamma$ can be varied oppositely by $F_{Yu}$ to make their product almost invariant. Thus, our scenario and the SM Higgs are indistinguishable in the inclusive $H\to \gamma\gamma$ channel. The current measurements on direct Yukawa coupling strength in the $H\to b\bar{b}/tau tau $ channel are not precise enough to fix the scale factor $F_{Yu}$. The most promising is the vector-boson-fusion channel in which the CMS has already observed possible suppression effect on the Yukawa couplings. Further more, by taking $F_{Yu}=1/2$, all current Higgs experimental results in different channels can be fitted successfully.

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