Constraints on the universal varying Yukawa couplings: from SM-like to fermiophobic (original) (raw)

Abstract

Varying the Standard Model (SM) fermion Yukawa couplings universally by a generic positive scale factor \( ({F_{{Y\,u}}}) \), 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 γγ can be varied oppositely by \( {F_{{Y{ ~ }u}}} \) to make their product almost invariant. Thus, our scenario and the SM Higgs are indistinguishable in the inclusive H → γγ channel. The current measurements on direct Yukawa coupling strength in the \( H \to b\overline b /\tau \tau \) channel are not precise enough to fix the scale factor \( {F_{{Y{ ~ }u}}} \). 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, the global χ2 fit of the experimental data can get the optimal value by introducing a suppression factor \( {F_{{Y{ ~ }u}}} \sim {1}/{2} \) on the SM Yukawa couplings.

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Authors and Affiliations

  1. State Key Laboratory of Theoretical Physics and Kavli Institute for Theoretical Physics China (KITPC), Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, P.R. China
    Tianjun Li & You-kai Wang
  2. George P. and Cynthia W. Mitchell Institute for Fundamental Physics, Texas A&M University, College Station, TX, 77843, U.S.A.
    Tianjun Li
  3. Institute of Theoretical Physics & State Key Laboratory of Nuclear Physics and Technology, Peking University, Yiheyuan Road, Beijing, 100871, P.R. China
    Xia Wan & Shou-hua Zhu
  4. Center for High Energy Physics, Peking University, Yiheyuan Road, Beijing, 100871, P.R. China
    Shou-hua Zhu

Authors

  1. Tianjun Li
  2. Xia Wan
  3. You-kai Wang
  4. Shou-hua Zhu

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Correspondence toTianjun Li.

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Li, T., Wan, X., Wang, Yk. et al. Constraints on the universal varying Yukawa couplings: from SM-like to fermiophobic.J. High Energ. Phys. 2012, 86 (2012). https://doi.org/10.1007/JHEP09(2012)086

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