Advertisement

Journal of High Energy Physics

, 2012:118 | Cite as

Comparative analysis of the semileptonic Λ b → Λℓ+ transition in SM and different SUSY scenarios using form factors from full QCD

  • K. AziziEmail author
  • S. Kartal
  • A. T. Olgun
  • Z. Tavukoğlu
Article

Abstract

We work out the semileptonic Λb → Λℓ+ transition in standard as well as different supersymmetric models. In particular, considering the parametrization of the matrix elements entered the low energy effective Hamiltonian in terms of form factors in full QCD, we calculate the amplitude and differential decay rate responsible for this decay channel in supersymmetric models. We then use the form factors calculated via light cone QCD sum rules in full theory to analyze the differential branching ratio and lepton forward-backward asymmetry of this decay channel in different supersymmetric models and compare the obtained results with those of the standard model. We also discuss how the results of different supersymmetric models deviate from the standard model predictions and which SUSY scenarios are favored.

Keywords

Rare Decays Beyond Standard Model Supersymmetric Standard Model Standard Model 

References

  1. [1]
    J. Incandela, Status of the CMS SM Higgs Search, talk given at Latest update in the search for the Higgs boson at CERN, CERN, Geneva, 4 July 2012.Google Scholar
  2. [2]
    F. Gianotti, Status of Standard Model Higgs searches in ATLAS, talk given at Latest update in the search for the Higgs boson at CERN, CERN, Geneva, 4 July 2012.Google Scholar
  3. [3]
    M. Hirsch, F. Joaquim and A. Vicente, Constrained SUSY seesaws with a 125 GeV Higgs, arXiv:1207.6635 [INSPIRE].
  4. [4]
    Q.-S. Yan, C.-S. Huang, W. Liao and S.-H. Zhu, Exclusive semileptonic rare decays B→(K,K ∗)+ in supersymmetric theories, Phys. Rev. D 62 (2000) 094023 [hep-ph/0004262] [INSPIRE].ADSGoogle Scholar
  5. [5]
    W.-J. Li, Y.-B. Dai and C.-S. Huang, Exclusive semileptonic rare decays BK (∗)+ in a SUSY SO(10) GUT, Eur. Phys. J. C 40 (2005) 565 [hep-ph/0410317] [INSPIRE].ADSCrossRefGoogle Scholar
  6. [6]
    M.J. Aslam, Y.-M. Wang and C.-D. Lu, Exclusive semileptonic decays of Λb → Λℓ+ in supersymmetric theories, Phys. Rev. D 78 (2008) 114032 [arXiv:0808.2113] [INSPIRE].ADSGoogle Scholar
  7. [7]
    A. Ahmed, I. Ahmed, M.A. Paracha, M. Junaid, A. Rehman and M. J. Aslam, Comparative Study of \( {B_c}\to D_s^{*}{\ell^{+}}{\ell^{-}} \) Decays in Standard Model and Supersymmetric Models, arXiv:1108.1058 [INSPIRE].
  8. [8]
    CDF collaboration, T. Aaltonen et al., Observation of the Baryonic Flavor-Changing Neutral Current Decay Λb → Λμ + μ , Phys. Rev. Lett. 107 (2011) 201802 [arXiv:1107.3753] [INSPIRE].ADSCrossRefGoogle Scholar
  9. [9]
    Y.S. Amhis (from LHCb collaboration), personal communications.Google Scholar
  10. [10]
    Particle Data Group collaboration, J. Beringer et al., Review of Particle Physics (RPP), Phys. Rev. D 86 (2012) 010001 [INSPIRE].ADSGoogle Scholar
  11. [11]
    T. Aliev, K. Azizi and M. Savci, Analysis of the Lambda b → Λℓ+ decay in QCD, Phys. Rev. D 81 (2010) 056006 [arXiv:1001.0227] [INSPIRE].ADSGoogle Scholar
  12. [12]
    G. Buchalla, A.J. Buras and M.E. Lautenbacher, Weak decays beyond leading logarithms, Rev. Mod. Phys. 68 (1996) 1125 [hep-ph/9512380] [INSPIRE].ADSCrossRefGoogle Scholar
  13. [13]
    M. Beneke, G. Buchalla, M. Neubert and C. Sachrajda, Penguins with Charm and Quark-Hadron Duality, Eur. Phys. J. C 61 (2009) 439 [arXiv:0902.4446] [INSPIRE].ADSCrossRefGoogle Scholar
  14. [14]
    A. Khodjamirian, T. Mannel, A. Pivovarov and Y.-M. Wang, Charm-loop effect in BK (∗)+ and BK γ, JHEP 09 (2010) 089 [arXiv:1006.4945][INSPIRE].ADSCrossRefGoogle Scholar
  15. [15]
    M.J. Aslam, C.-D. Lu and Y.-M. Wang, \( B\to K_0^{*}\left( {1430} \right){\ell^{+}}{\ell^{-}} \) decays in supersymmetric theories, Phys. Rev. D 79 (2009) 074007 [arXiv:0902.0432] [INSPIRE].ADSGoogle Scholar
  16. [16]
    J.-F. Cheng, C.-S. Huang and X.-H. Wu, Neutral Higgs boson contributions to CP asymmetry of B → φK s in MSSM, Phys. Lett. B 585 (2004) 287 [hep-ph/0306086] [INSPIRE].ADSGoogle Scholar
  17. [17]
    C.-S. Huang, P. Ko, X.-H. Wu and Y.-D. Yang, MSSM anatomy of the polarization puzzle in B→φK decays, Phys. Rev. D 73 (2006) 034026 [hep-ph/0511129][INSPIRE].ADSGoogle Scholar
  18. [18]
    J.-F. Cheng, C.-S. Huang and X.-H. Wu, CP asymmetries in B → φK S and B → η K S in MSSM, Nucl. Phys. B 701 (2004) 54 [hep-ph/0404055] [INSPIRE].ADSCrossRefGoogle Scholar

Copyright information

© SISSA, Trieste, Italy 2012

Authors and Affiliations

  • K. Azizi
    • 1
    Email author
  • S. Kartal
    • 2
  • A. T. Olgun
    • 2
  • Z. Tavukoğlu
    • 2
  1. 1.Department of PhysicsDoğus UniversityIstanbulTurkey
  2. 2.Department of PhysicsIstanbul UniversityIstanbulTurkey

Personalised recommendations