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Self-cancellation of a scalar in neutral meson mixing and implications for the LHC

M. Nebot and João P. Silva
Phys. Rev. D 92, 085010 – Published 7 October 2015
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  • INTRODUCTION
  • SELF-CANCELLATION IN NEUTRAL MESON…
  • FCNSI-INDUCED HIGGS PRODUCTION AT THE…
  • CONCLUSIONS
  • ACKNOWLEDGMENTS
  • APPENDICES
    • References

    Abstract

    Flavor-changing neutral scalar interactions are a standard feature of generic multi-Higgs models. These are constrained by mixing in the neutral meson systems. We consider situations where there are natural cancellations in such contributions. In particular, when the spin-0 particle has both scalar and pseudoscalar couplings, one may have a self-cancellation. We illustrate one such partial cancellation with Branco-Grimus-Lavoura models. We also inquire whether the flavor-changing quark interactions can lead to new production mechanisms for a neutral scalar at LHC.

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    • Received 12 August 2015

    DOI:https://doi.org/10.1103/PhysRevD.92.085010

    © 2015 American Physical Society

    Authors & Affiliations

    M. Nebot* and João P. Silva†

    • CFTP, Departamento de Física, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais 1, 1049 Lisboa, Portugal

    • *nebot@cftp.ist.utl.pt
    • †jpsilva@cftp.ist.utl.pt

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    Vol. 92, Iss. 8 — 15 October 2015

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    Images

    • Figure 1
      Figure 1

      Left panel: Cross section for S production in pp collisions at 8 TeV (left panel) and at 14 TeV (right panel) through the qiqj partons indicated, assuming that they couple as the SM bb¯. For reference, we show also the cross section for glue-glue production.

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    • Figure 2
      Figure 2

      Sum of the cross sections σ(pp(q1q¯2)→S)+σ(pp(q2q¯1)→S) for the maximal values of the pure scalar couplings consistent with meson mixings at 8 (left panel) and 14 TeV (right panel).

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    • Figure 3
      Figure 3

      Sum of the cross sections σ(pp(q1q¯2)→S)+σ(pp(q2q¯1)→S) for the maximal values of the pure pseudoscalar couplings consistent with meson mixings at 8 (left panel) and 14 TeV (right panel).

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    • Figure 4
      Figure 4

      pFT as a function of mS for r=1 (solid line), r=0.1 (dashed), and r=0.05 (dotted).

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