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The European Physical Journal C

, Volume 70, Issue 4, pp 1017–1024 | Cite as

CP violating asymmetry in stop decay into bottom and chargino

  • Helmut Eberl
  • Sebastian M. R. FrankEmail author
  • Walter Majerotto
Regular Article - Theoretical Physics

Abstract

In the MSSM with complex parameters, loop corrections to the decay of a stop into a bottom quark and a chargino can lead to a CP violating decay rate asymmetry. We calculate this asymmetry at full one-loop level and perform a detailed numerical study, analyzing the dependence on the parameters and complex phases involved. If the stop can decay into a gluino, the self-energy and the vertex correction dominate due to the strong coupling. It is shown that the vertex contribution is always suppressed. We therefore give a simple approximate formula for the asymmetry. We account for the constraints on the parameters coming from several experimental limits. Asymmetries up to 25 percent are obtained. We also comment on the feasibility of measuring this asymmetry at the LHC.

Keywords

Yukawa Coupling Minimal Supersymmetric Standard Model High Energy Phys Branch Ratio Vertex Correction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    M. Dugan, B. Grinstein, L.J. Hall, Nucl. Phys. B 255, 413 (1985) CrossRefADSGoogle Scholar
  2. 2.
    T. Ibrahim, P. Nath, Phys. Rev. D 57, 478 (1998). arXiv:hep-ph/9708456 CrossRefADSGoogle Scholar
  3. 3.
    M. Brhlik, G.J. Good, G.L. Kane, Phys. Rev. D 59, 115004 (1999). arXiv:hep-ph/9810457 CrossRefADSGoogle Scholar
  4. 4.
    A. Bartl, T. Gajdosik, W. Porod, P. Stockinger, H. Stremnitzer, Phys. Rev. D 60, 073003 (1999). arXiv:hep-ph/9903402 CrossRefADSGoogle Scholar
  5. 5.
    A. Pilaftsis, Nucl. Phys. B 644, 263 (2002). arXiv:hep-ph/0207277 CrossRefADSGoogle Scholar
  6. 6.
    A. Bartl, W. Majerotto, W. Porod, D. Wyler, Phys. Rev. D 68, 053005 (2003). arXiv:hep-ph/0306050 CrossRefADSGoogle Scholar
  7. 7.
    V.D. Barger et al., Phys. Rev. D 64, 056007 (2001). arXiv:hep-ph/0101106 CrossRefADSGoogle Scholar
  8. 8.
    M. Pospelov, A. Ritz, Ann. Phys. 318, 119 (2005). arXiv:hep-ph/0504231 CrossRefADSzbMATHGoogle Scholar
  9. 9.
    K.A. Olive, M. Pospelov, A. Ritz, Y. Santoso, Phys. Rev. D 72, 075001 (2005). arXiv:hep-ph/0506106 CrossRefADSGoogle Scholar
  10. 10.
    S. Abel, O. Lebedev, J. High Energy Phys. 01, 133 (2006). arXiv:hep-ph/0508135 CrossRefADSGoogle Scholar
  11. 11.
    S. Yaser Ayazi, Y. Farzan, Phys. Rev. D 74, 055008 (2006). arXiv:hep-ph/0605272 CrossRefADSGoogle Scholar
  12. 12.
    J.R. Ellis, J.S. Lee, A. Pilaftsis, J. High Energy Phys. 10, 049 (2008). arXiv:0808.1819 [hep-ph] CrossRefADSGoogle Scholar
  13. 13.
    T. Gajdosik, Acta Phys. Pol. B 40, 3171 (2009). arXiv:0910.3512 [hep-ph] ADSGoogle Scholar
  14. 14.
    S. Kraml, in Proceedings of SUSY07, Karlsruhe, Germany, 26 Jul–1 Aug 2007 (2007), p. 132. arXiv:0710.5117 [hep-ph]
  15. 15.
    E. Christova, H. Eberl, W. Majerotto, S. Kraml, Nucl. Phys. B 639, 263 (2002). arXiv:hep-ph/0205227 CrossRefADSGoogle Scholar
  16. 16.
    E. Christova, H. Eberl, E. Ginina, W. Majerotto, J. High Energy Phys. 02, 075 (2007). arXiv:hep-ph/0612088 CrossRefADSGoogle Scholar
  17. 17.
    E. Christova, H. Eberl, W. Majerotto, S. Kraml, J. High Energy Phys. 12, 021 (2002). arXiv:hep-ph/0211063 CrossRefADSGoogle Scholar
  18. 18.
    E. Christova, E. Ginina, M. Stoilov, J. High Energy Phys. 11, 027 (2003). arXiv:hep-ph/0307319 CrossRefADSGoogle Scholar
  19. 19.
    E. Ginina, contributed to 4th Advanced Research Workshop: Gravity, Astrophysics, and Strings at the Black Sea, Kiten, Bourgas, Bulgaria, 10–16 Jun 2007 (2008). arXiv:0801.2344 [hep-ph]
  20. 20.
    E. Christova, H. Eberl, E. Ginina, Talk given at Prospects for Charged Higgs Discovery at Colliders (CHARGED 2008), Uppsala, Sweden, 16–19 Sep 2008 (2008). arXiv:0812.0265 [hep-ph]
  21. 21.
    E. Christova, H. Eberl, E. Ginina, W. Majerotto, Phys. Rev. D 79, 096005 (2009). arXiv:0812.4392 [hep-ph] CrossRefADSGoogle Scholar
  22. 22.
    M. Frank, I. Turan, Phys. Rev. D 76, 076008 (2007). arXiv:0708.0026 [hep-ph] CrossRefADSGoogle Scholar
  23. 23.
    M. Frank, I. Turan, Phys. Rev. D 76, 016001 (2007). arXiv:hep-ph/0703184 CrossRefADSGoogle Scholar
  24. 24.
    A. Arhrib, R. Benbrik, M. Chabab, W.T. Chang, T.-C. Yuan, Int. J. Mod. Phys. A 22, 6022 (2008). arXiv:0708.1301 [hep-ph] CrossRefADSGoogle Scholar
  25. 25.
    H. Eberl, T. Gajdosik, W. Majerotto, B. Schrausser, Phys. Lett. B 618, 171 (2005). arXiv:hep-ph/0502112 CrossRefADSGoogle Scholar
  26. 26.
    J. Ellis, F. Moortgat, G. Moortgat-Pick, J.M. Smillie, J. Tattersall, Eur. Phys. J. C 60, 633 (2009). arXiv:0809.1607 [hep-ph] CrossRefADSGoogle Scholar
  27. 27.
    F. Deppisch, O. Kittel, J. High Energy Phys. 09, 110 (2009). arXiv:0905.3088 [hep-ph] CrossRefADSGoogle Scholar
  28. 28.
    G. Moortgat-Pick, K. Rolbiecki, J. Tattersall, P. Wienemann, J. High Energy Phys. 01, 004 (2010). arXiv:0908.2631 [hep-ph] CrossRefADSGoogle Scholar
  29. 29.
    S.M.R. Frank, H. Eberl, AIP Conf. Proc. 1200, 518 (2010). arXiv:0910.0154 [hep-ph] CrossRefADSGoogle Scholar
  30. 30.
    S. Frank, Master’s thesis, Johannes Kepler University Linz, 2008. arXiv:0909.3969 [hep-ph]
  31. 31.
    G. Passarino, M.J.G. Veltman, Nucl. Phys. B 160, 151 (1979) CrossRefADSGoogle Scholar
  32. 32.
    A. Denner, Fortschr. Phys. 41, 307 (1993). arXiv:0709.1075 [hep-ph] Google Scholar
  33. 33.
    T. Hahn, Comput. Phys. Commun. 140, 418 (2001). arXiv:hep-ph/0012260 CrossRefADSzbMATHGoogle Scholar
  34. 34.
    J.S. Lee, M. Carena, J. Ellis, A. Pilaftsis, C.E.M. Wagner, Comput. Phys. Commun. 180, 312 (2009). arXiv:0712.2360 [hep-ph] CrossRefADSGoogle Scholar
  35. 35.
    C. Amsler et al. (Particle Data Group), Phys. Lett. B 667, 1 (2008), and 2009 partial update for the 2010 edition CrossRefADSGoogle Scholar
  36. 36.
    W.C. Griffith et al., Phys. Rev. Lett. 102, 101601 (2009) CrossRefADSGoogle Scholar
  37. 37.
    E. Komatsu et al. (WMAP), Astrophys. J. Suppl. 180, 330 (2009). arXiv:0803.0547 [hep-ph] CrossRefADSGoogle Scholar
  38. 38.
    G. Belanger, F. Boudjema, S. Kraml, A. Pukhov, A. Semenov, Phys. Rev. D 73, 115007 (2006). arXiv:hep-ph/0604150 CrossRefADSGoogle Scholar
  39. 39.
    G. Belanger, F. Boudjema, A. Pukhov, A. Semenov, Comput. Phys. Commun. 176, 367 (2007). arXiv:hep-ph/0607059 CrossRefADSzbMATHGoogle Scholar
  40. 40.
    E. Barberio et al. (Heavy Flavor Averaging Group), (2008). arXiv:0808.1297, and online update at http://www.slac.stanford.edu/xorg/hfag
  41. 41.
    S. Kraml, H. Eberl, A. Bartl, W. Majerotto, W. Porod, Phys. Lett. B 386, 175 (1996). arXiv:hep-ph/9605412 CrossRefADSGoogle Scholar
  42. 42.
    J. Guasch, W. Hollik, J. Sola, (2003). arXiv:hep-ph/0307011
  43. 43.
    G. Moortgat-Pick, K. Rolbiecki, J. Tattersall, (2010). arXiv:1008.2206 [hep-ph]
  44. 44.
    W. Beenakker, M. Kramer, T. Plehn, M. Spira, P.M. Zerwas, Nucl. Phys. B 515, 3 (1998). arXiv:hep-ph/9710451 CrossRefADSGoogle Scholar
  45. 45.
    U. Dydak, CMS TN/96-022 (1996) Google Scholar
  46. 46.
    A. Bartl, W. Majerotto, K. Monig, A.N. Skachkova, N.B. Skachkov, Phys. Part. Nucl. Lett. 6, 181 (2009). arXiv:0906.3805 [hep-ph] CrossRefGoogle Scholar

Copyright information

© Springer-Verlag / Società Italiana di Fisica 2010

Authors and Affiliations

  • Helmut Eberl
    • 1
  • Sebastian M. R. Frank
    • 1
    Email author
  • Walter Majerotto
    • 1
  1. 1.Institute of High Energy PhysicsAustrian Academy of SciencesViennaAustria

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