Branching Ratios from H→γγ and H→Zγ with a 125 GeV Higgs Boson

Alejandro  Gutiérrez-Rodríguez; María de los Ángeles  Hernández-Ruíz; Polet  Castañeda-Almanza; Alejandro  González-Sánchez

doi:10.4236/jmp.2012.312229

Alejandro Gutiérrez-Rodríguez^*, María de los Ángeles Hernández-Ruíz, Polet Castañeda-Almanza, Alejandro González-Sánchez

Abstract: Motivated by the recent result reported from LHC on the di-photon search from the Standard Model (SM) Higgs boson, we obtain limits on the anomalous couplings Hγγ and HZγ. We also perform a calculation at tree level of the decay widths as well as of the branching ratios for the reactions H → γγ and H → Zγ in the context of effective lagrangian for Higgs boson masses 115 ≤MH ≤ 130 GeV. We find that the decay widths and branching ratios from these reactions enhanced significantly due to the anomalous Hγγ and HZγ vertex, which would lead to measurable effects in Higgs signals at the LHC. Moreover, our results complement other studies on the channels H → γγ and H → Zγ.

Keywords: Standard Model Higgs Boson; Models beyond the Standard Model

Cite this paper: A. Gutiérrez-Rodríguez, M. Hernández-Ruíz, P. Castañeda-Almanza and A. González-Sánchez, "Branching Ratios from H→γγ and H→Zγ with a 125 GeV Higgs Boson," Journal of Modern Physics, Vol. 3 No. 12, 2012, pp. 1835-1839. doi: 10.4236/jmp.2012.312229.

References

[1] The ATLAS and CMS Collaboration, “Combined Standard Model Higgs Boson Search with up to 2.3 bf-1 of pp Collisions at √s= 7 TeV at the LHC,” ATLAS-CONf-2011-157, CMSPAS-HIG-11-023.

[2] J. R. Ellis, M. K. Gaillard and D. V. Nanopoulos, “A Phenomenological Profile of the Higgs Boson,” Nuclear Physics B, Vol. 106, No. 2, 1976, pp. 292-340. doi:10.1016/0550-3213(76)90184-X

[3] J. F. Gunion, G. L. Kane and J. Wudka, “Search Techniques for Charged and Neutral Intermediate Mass Higgs Bosons,” Nuclear Physics B, Vol. 299, No. 2, 1988, pp. 231-278. doi:10.1016/0550-3213(88)90284-2

[4] U. Cotti, J. L. Diaz-Cruz and J. J. Toscano, “Exact Formulae for Higgs Production through eγ → eH in the Nonlinear R(ξ) Gauge,” Physics Letters B, Vol. 404, No. 3-4, 1997, pp. 308-314. doi:10.1016/S0370-2693(97)00590-X

[5] R. Martinez, M. A. Perez and J. J. Toscano, “The Two Photon Decay Width of the Higgs Boson in Left-right Symmetric Theories,” Physical Review D, Vol. 40, No. 5, 1989, pp. 1722-1724. doi:10.1103/PhysRevD.40.1722

[6] A. Djouadi, V. Driesen, W. Hollik and A. Kraft, “The Higgs Photon-Z Boson Coupling Revisited,” The European Physical Journal C, Vol. 1, No. 1-2, 1998, pp. 163- 175. doi:10.1007/BF01245806

[7] T. G. Rizzo, “Probing the WHZ Vertex in E(6) Models at Colliders,” Physical Review D, Vol. 39, No. 3, 1989, pp. 728-735. doi:10.1103/PhysRevD.39.728

[8] J. M. Hernandez, M. A. Perez and J. J. Toscano, “Decays H0 → γγ,γZ, and Z → γH0 in the Effective Lagrangian Approach,” Physical Review D, Vol. 51, No. 5, 1995, pp. 2044-2048. doi:10.1103/PhysRevD.51.R2044

[9] K. Hagiwara and M. L. Stong, “Probing the Scalar Sector in e⁺e^- → ffH,” Zeitschrift fur Physik C, Vol. 62, 1994, pp. 99-108. doi:10.1007/BF01559529

[10] S. Dutta, K. Hagiwara and Y. Matsumoto, “Measuring the Higgs-Vector Boson Couplings at Liner e⁺e^- Collider,” Physical Review D, Vol. 78, No. 11, 2008, Article ID: 115016. doi:10.1103/PhysRevD.78.115016

[11] J. de Blas Mateos, “Effective Lagrangian Descrition of Physics beyond the Standard Model and Electroweak Precision Tests,” Universidad de Granada, Granada, 2010.

[12] G. J. Gounaris, J. Layssac and F. M. Renard, “The Processes e^-e⁺→γγ, Zγ, ZZ in SM and MSSM,” Physical Review D, Vol. 67, No. 1, 2003, Article ID: 013012.

[13] A. Gutiérrez-Rodríguez, J. Monta?o and M. A. Pérez, “Bounds on Anomalous HZγ Vertex Arising from the Process e+e-→τ+τ-γ,” Journal of Physics G: Nuclear and Particle Physics, Vol. 38, No. 9, 2011, Article ID: 095003. doi:10.1088/0954-3899/38/9/095003

[14] C.-S. Li, C.-F. Qiao and S.-H. Zhu, “Radiative Higgs Boson Decays H → ffγ beyond the Standard Model,” Physical Review D, Vol. 57, 1998, pp. 6928-6933. doi:10.1103/PhysRevD.57.6928

[15] M. A. Perez, G. Tavares-Velasco and J. J. Toscano, “New Physics Effects in Rare Z decays,” International Journal of Modern Physics A, Vol. 19, No. 2, 2004, pp. 159-178. doi:10.1142/S0217751X04017100

[16] V. Hankele, G. Klamke, D. Zeppenfeld and T. Figy, “Anomalous Higgs Boson Couplings in Vector Boson Fusion at the CERN LHC,” Physical Review D, Vol. 74, No. 9, 2006, Article ID: 095001. doi:10.1103/PhysRevD.74.095001

[17] S. D. Rindani and P. Sharma, “Angular Distributions as a Probe of Anomalous ZZH and γZH Interactions at a Linear Collider with Polarized Beams,” Physical Review D, Vol. 79, No. 7, 2009, Article ID: 075007. doi:10.1103/PhysRevD.79.075007

[18] W. Kilian, M. Kramer and P. M. Zerwas, “Anomalous Couplings in the Higgsstrahlung Process,” Physics Letters B, Vol. 381, No. 1-3, 1996, pp. 243-247. doi:10.1016/0370-2693(96)00537-0

[19] K. Nakamura, et al., “Particle Data Group,” Journal of Physics G: Nuclear and Particle Physics, Vol. G37, 2010, p. 1.

[20] K. Fujii, K. Ikematsu, S. Kanemura, Y. Kurihara, N. Maeda and T. Takahashi, “Feasibility Study of Higgs Pair Creation in γγ Collider,” arXiv: 1008.0907 [hep-ph].

[21] P. Achard, et al., “Search for Anomalous Couplings in the Higgs Sector at LEP,” Physics Letters B, Vol. 589, No. 3-4, 2004, pp. 89-102. doi:10.1016/j.physletb.2004.03.048