Top Yukawa coupling measurement with indefinite CP Higgs in e+e- → t(t)over-barΦ

被引:10
|
作者
Ananthanarayan, B. [1 ]
Garg, Sumit K. [2 ,3 ]
Kim, C. S. [2 ,3 ]
Lahiri, Jayita [1 ]
Poulose, P. [4 ]
机构
[1] Indian Inst Sci, Ctr High Energy Phys, Bangalore 560012, Karnataka, India
[2] Yonsei Univ, Dept Phys, Seoul 120749, South Korea
[3] Yonsei Univ, IPAP, Seoul 120749, South Korea
[4] Indian Inst Technol Guwahati, Dept Phys, Gauhati 781039, India
基金
新加坡国家研究基金会;
关键词
VIOLATION; MODEL; LHC;
D O I
10.1103/PhysRevD.90.014016
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We consider the issue of the top quark Yukawa coupling measurement in a model-independent and general case with the inclusion of CP violation in the coupling. Arguably the best process to study this coupling is the associated production of the Higgs boson along with a t (t) over bar pair in a machine like the International Linear Collider (ILC). While detailed analyses of the sensitivity of the measurement-assuming a Standard Model (SM)-like coupling is available in the context of the ILC-conclude that the coupling could be pinned down to about a 10% level with modest luminosity, our investigations show that the scenario could be different in the case of a more general coupling. The modified Lorentz structure resulting in a changed functional dependence of the cross section on the coupling, along with the difference in the cross section itself leads to considerable deviation in the sensitivity. Our studies of the ILC with center-of-mass energies of 500 GeV, 800 GeV, and 1000 GeV show that moderate CP mixing in the Higgs sector could change the sensitivity to about 20%, while it could be worsened to 75% in cases which could accommodate more dramatic changes in the coupling. Detailed considerations of the decay distributions point to a need for a relook at the analysis strategy followed for the case of the SM, such as for a model-independent analysis of the top quark Yukawa coupling measurement. This study strongly suggests that a joint analysis of the CP properties and the Yukawa coupling measurement would be the way forward at the ILC and that caution must be exercised in the measurement of the Yukawa couplings and the conclusions drawn from it.
引用
收藏
页数:16
相关论文
共 50 条
  • [1] Probing the indefinite CP nature of the Higgs boson through decay distributions in the process e+e- → t(t)over-barΦ
    Ananthanarayan, B.
    Garg, Sumit K.
    Lahiri, Jayita
    Poulose, P.
    [J]. PHYSICAL REVIEW D, 2013, 87 (11)
  • [2] Top-Higgs and the process e+e- → ν(ν)over-bart(t)over-bar
    Yue, CX
    Yang, H
    Zhang, YM
    Liu, GL
    [J]. COMMUNICATIONS IN THEORETICAL PHYSICS, 2002, 37 (04) : 447 - 449
  • [3] SUSY induced CP violation in e+e-→t(t)over-bar
    Bartl, A
    Christova, E
    Gajdosik, T
    Majerotto, W
    [J]. BEYOND THE STANDARD MODEL: FROM THEORY TO EXPERIMENT, 1998, : 148 - 151
  • [4] CP VIOLATION IN T(T)OVER-BAR PRODUCTION AT E+E- COLLIDERS
    GRZADKOWSKI, B
    [J]. PHYSICS LETTERS B, 1993, 305 (04) : 384 - 391
  • [5] Model-independent analysis of Higgs spin and CP properties in the process e+e- → t(t)over-barΦ
    Godbole, R. M.
    Hangst, C.
    Muehlleitner, M.
    Rindani, S. D.
    Sharma, P.
    [J]. EUROPEAN PHYSICAL JOURNAL C, 2011, 71 (06):
  • [6] Decay of top quarks in e+e-→t(t)over-bar near threshold
    Sumino, Y
    Jezabek, M
    [J]. ACTA PHYSICA POLONICA B, 1998, 29 (05): : 1443 - 1456
  • [7] CP VIOLATION IN H-]T(T)OVER-BAR DECAYS AT E+E- COLLIDERS
    GRZADKOWSKI, B
    [J]. PHYSICS LETTERS B, 1994, 338 (01) : 71 - 79
  • [8] Measurement of the top-Higgs Yukawa coupling at a linear e+e- collider
    Gay, A.
    [J]. EUROPEAN PHYSICAL JOURNAL C, 2007, 49 (02): : 489 - 497
  • [9] Measurement of the top-Higgs Yukawa coupling at a linear e+e- collider
    A. Gay
    [J]. The European Physical Journal C, 2007, 49 : 489 - 497
  • [10] t(t)over-barH → t(t)over-barτ+τ--toward the measurement of the top-Yukawa coupling
    Gross, Eilam
    Zivkovic, Lidija
    [J]. EUROPEAN PHYSICAL JOURNAL C, 2009, 59 (03): : 731 - 754