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Top A FB at the Tevatron vs. charge asymmetry at the LHC in chiral U(1) flavor models with flavored Higgs doublets

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Abstract

We consider the top forward–backward (FB) asymmetry at the Tevatron and top charge asymmetry at the LHC within chiral U(1)′ models with flavor-dependent U(1)′ charges and flavored Higgs fields, which were introduced in Ko et al. (J. High Energy Phys. 1201:147, 2012). In this model, one has to include the flavor-changing couplings of the Higgs bosons as well as the Z′ to the up-type quarks. The models could enhance not only the top forward–backward asymmetry at the Tevatron, but also the top charge asymmetry at LHC, without too large same-sign top-quark pair production rates. Also the \(m_{t\bar{t}}\) distribution at high \(m_{t\bar{t}}\) shows less deviations from the SM predictions. We identify parameter spaces for the U(1)′ gauge boson and (pseudo) scalar Higgs bosons where all the experimental data could be accommodated, including the case with about 125 GeV Higgs boson, as suggested recently by ATLAS and CMS.

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Notes

  1. We note that the relation is not valid for the other charge assignments.

  2. It is also true that one cannot write nonrenormalizable Yukawa interactions with the SM Higgs doublet only. It is essential to include the Higgs doublets with nonzero U(1)′ charges in order that one can write Yukawa couplings for the up-type quarks in this model.

  3. This assumption is not compulsory, since all the Higgs bosons might participate in the top-quark pair production in principle. We will keep only a few lightest (pseudo) scalar bosons in order to simplify the numerical analysis.

  4. There may be another possibility that the new particle is a heavier Higgs boson and the lightest Higgs boson has not been discovered yet because of suppression of its couplings to the SM particles. However, we do not consider this scenario in this work.

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Acknowledgements

We thank the Korea Institute for Advanced Study for providing computing resources (KIAS Center for Advanced Computation Abacus System) for this work. This work is supported in part by Basic Science Research Program through NRF 2011-0022996 (CY), by NRF Research Grant 2012R1A2A1A01006053 (PK and CY), and by SRC program of NRF Grant No. 20120001176 through Korea Neutrino Research Center at Seoul National University (PK).

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  1. School of Physics, KIAS, Seoul, 130-722, Korea

    P. Ko, Yuji Omura & Chaehyun Yu

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  1. P. Ko
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Correspondence to Chaehyun Yu.

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Ko, P., Omura, Y. & Yu, C. Top A FB at the Tevatron vs. charge asymmetry at the LHC in chiral U(1) flavor models with flavored Higgs doublets. Eur. Phys. J. C 73, 2269 (2013). https://doi.org/10.1140/epjc/s10052-012-2269-6

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