Location via proxy:   [ UP ]  
[Report a bug]   [Manage cookies]                

Reappraisal of the wrong-sign hbb¯ coupling and the study of h→Zγ

Duarte Fontes, J. C. Romão, and João P. Silva
Phys. Rev. D 90, 015021 – Published 18 July 2014
PDFHTMLExport Citation
Abstract
Authors
Article Text
  • INTRODUCTION
  • FIT PROCEDURE AND SOME RESULTS
  • PREDICTIONS FOR THE 14 TeV RUN
  • PREDICTIONS FOR THE FLIPPED 2HDM
  • CONCLUSIONS
  • ACKNOWLEDGEMENTS
    • References

    Abstract

    It has been pointed out recently that current experiments still allow for a two Higgs doublet model where the hbb¯ coupling (kDmb/v) is negative; a sign opposite to that of the Standard Model. Due to the importance of delayed decoupling in the hH+H− coupling, h→γγ improved measurements will have a strong impact on this issue. For the same reason, measurements or even bounds on h→Zγ are potentially interesting. In this article, we revisit this problem, highlighting the crucial importance of h→VV, which can be understood with simple arguments. We show that the impacts on kD<0 models of both h→bb¯ and h→τ+τ− are very sensitive to input values for the gluon fusion production mechanism; in contrast, h→γγ and h→Zγ are not. We also inquire if the search for h→Zγ and its interplay with h→γγ will impact the sign of the hbb¯ coupling. Finally, we study these issues in the context of the flipped two Higgs doublet model.

    • Figure
    • Figure
    • Figure
    • Figure
    • Figure
    • Figure
    • Figure
    4 More
    • Received 2 July 2014

    DOI:https://doi.org/10.1103/PhysRevD.90.015021

    © 2014 American Physical Society

    Authors & Affiliations

    Duarte Fontes1,*, J. C. Romão1,†, and João P. Silva2,1,‡

    • 1Centro de Física Teórica de Partículas (CFTP), Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
    • 2Instituto Superior de Engenharia de Lisboa-ISEL, 1959-007 Lisboa, Portugal

    • *duartefontes@tecnico.ulisboa.pt
    • †jorge.romao@tecnico.ulisboa.pt
    • ‡jpsilva@cftp.tecnico.ulisboa.pt

    Article Text (Subscription Required)

    Click to Expand

    References (Subscription Required)

    Click to Expand
    Issue

    Vol. 90, Iss. 1 — 1 July 2014

    Reuse & Permissions
    Access Options
    Author publication services for translation and copyediting assistance advertisement

    Authorization Required

    Log In
    Other Options
    ×

    Images

    • Figure 1
      Figure 1

      Left panel: Assuming that all μf are within 20% of the SM prediction we plot μbb¯ (red/dark gray) and μγγ (black). Right panel: Assuming now that μVV are within 5% of the SM prediction we plot the same quantities. For comparison we also plot μbb¯ (cyan/light gray) for the assumed production of Ref. [7].

      Reuse & Permissions
    • Figure 2
      Figure 2

      Left panel: Plot of tanβ as a function of sinα for all the points that obey Eq. (10) with 0.8≤μVV≤1.2. Right panel: Plot of sin2(β−α) as a function of tanβ for the points that obey Eq. (10) with 0.8≤μVV≤1.2 and have kD<0.

      Reuse & Permissions
    • Figure 3
      Figure 3

      Fractional variation of sin2(β−α) as a function of tanβ for all points with kD<0 that obey Eq. (10) with 0.8≤μVV≤1.2.

      Reuse & Permissions
    • Figure 4
      Figure 4

      Left panel: kD2 as a function of sin2(β−α) for all points with kD<0 that obey Eq. (10) with 0.8≤μVV≤1.2 (black) or with 0.95≤μVV≤1.05 (cyan/light gray). Right panel: The same but for generated data obeying the model constraints.

      Reuse & Permissions
    • Figure 5
      Figure 5

      Allowed region for kD2 as a function of sin2(β−α) for all points with kD<0 that obey 0.8≤μVV≤1.2 (black). The region in cyan (light gray) is obtained by imposing in addition that 0.8≤μττ≤1.2, while in the region in red (dark gray) we further impose 0.8≤μγγ≤1.2.

      Reuse & Permissions
    • Figure 6
      Figure 6

      Same as in Fig. 5, but for the assumed production rates in Ref. [7]. See text for details.

      Reuse & Permissions
    • Figure 7
      Figure 7

      Left panel: Prediction for μτ+τ− (red/dark gray) and μγγ (black) as a function of tanβ for the LHC at 14 TeV with the constraint of 20% errors at 8 TeV. Right panel: Assuming now that μVV are within 5% of the SM prediction at 14 TeV, we plot the same quantities. Also shown (cyan/light gray) is the prediction for μbb¯(Vh) from associated production.

      Reuse & Permissions
    • Figure 8
      Figure 8

      Prediction for μτ+τ− (red/dark gray), μZγ (cyan/light gray), and μγγ (black) as a function of tanβ, for the LHC at 14 TeV, with a measurement of μVV within 5% of the SM at 14 TeV.

      Reuse & Permissions
    • Figure 9
      Figure 9

      Predictions for μZγ versus μγγ at 14 TeV, for kD<0. In black, we have the points in the SET (obeying theoretical constraints and S,T,U, only). In red/dark gray (cyan/light gray), the points satisfying, in addition, VV within 20% (5%) of the SM, at 14 TeV.

      Reuse & Permissions
    • Figure 10
      Figure 10

      Predictions for μZγ versus μγγ at 14 TeV, for kD>0. In black, we have the points in the SET (obeying theoretical constraints and S,T,U, only). In red/dark-gray (cyan/light gray), the points satisfying, in addition, VV within 20% (5%) of the SM, at 14 TeV.

      Reuse & Permissions
    • Figure 11
      Figure 11

      Left panel: Allowed region for kD2 as a function of sin2(β−α) in the flipped 2HDM, for all points with kD<0 that obey 0.8≤μVV≤1.2 (black). The region in cyan (light gray) is obtained by imposing, in addition, that 0.8≤μττ≤1.2, while in the region in red (dark gray) we further impose 0.8≤μγγ≤1.2. Right panel: Predictions for μZγ versus μγγ at 14 TeV, for kD<0, in the flipped 2HDM. In black, we have the points in the SET (obeying theoretical constraints and S,T,U, only). In red/dark gray (cyan/light gray), the points satisfying, in addition, VV within 20% (5%) of the SM, at 14 TeV. Shown in green/light gray are the points satisfying μτ+τ− at 20% of the SM, which lie on a line going diagonally from the origin with almost unit slope.

      Reuse & Permissions
    ×

    Sign up to receive regular email alerts from Physical Review D

    Log In

    Cancel
    ×

    Search

    Article Lookup

    Paste a citation or DOI
    Enter a citation
    ×