S. Khalil

Publications (7)7.37 Total impact

• Source

  Available from: ArXiv

  Article: Supersymmetric contributions to B --> K \pi branching ratio

  S. Khalil, E. Kou
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  ABSTRACT: We analyze the supersymmetric contributions to the B --> K\pi process. We show that the simultaneous contributions from the penguin diagrams with chargino and gluino in the loop could lead to a possible solution to the B --> K \pi puzzle. Our result indicates that including the stringent constraint from the b --> s \gamma branching ratio, the supersymmeteric models with light right-handed top-squark and large mixing between second and third generation of up and down squarks is the most preferred by the current experimental data. Comment: 4 pages, revtex, 2 figures
  07/2004;
• Source

  Available from: arxiv.org

  Article: B_ {s}^{0}-B_ {s}^{0} mixing and the B_ {s}→ J/ψφ asymmetry in supersymmetric models

  P. Ball, S. Khalil, E. Kou
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  ABSTRACT: We analyze supersymmetric contributions to Bs mixing and their impact on mixing-induced CP asymmetries, using the mass insertion approximation. We discuss in particular the correlation of supersymmetry (SUSY) effects in the CP asymmetries of Bs→J/ψφ and Bd→φKS and find that the mass insertions dominant in Bs mixing and Bd→φKS are (δ23d)LL,RR and (δ23d)LR,RL, respectively. We show that models with dominant (δ23d)LR,RL can accommodate a negative value of SφKS, in agreement with the Belle measurement of that observable, but yield a Bs mixing phase too small to be observed. On the other hand, models with dominant (δ23d)LL,RR predict sizable SUSY contributions to both ΔMs and the mixing phase, but do not allow the asymmetry in Bd→φKS to become negative, except for small values of the average down squark mass, which, in turn, entail a value of ΔMs too large to be observed at the Fermilab Tevatron and CERN LHC. We conclude that the observation of Bs mixing at hadron machines, together with the confirmation of a negative value of SφKS, disfavors models with a single dominant mass insertion.
  Phys. Rev. D. 06/2004; 69(11).
• Source

  Available from: arxiv.org

  Article: Possible supersymmetric solution to the discrepancy between B-->phiK(S) and B-->eta'K(S) CP asymmetries.

  S Khalil, E Kou
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  ABSTRACT: We present a possible supersymmetric solution to the discrepancy between the observed mixing CP asymmetries in B-->phiK(S) and B-->eta(')K(S). We show that, due to the different parity in the final states of these processes, their supersymmetric contributions from the R sector have opposite signs, which naturally leads to S(phiK(S)) not equal Seta(')(K(S)). We also consider the proposed mechanisms to solve the puzzle of the observed large branching ratio of B-->eta'K and their impact on Seta(')(K(S)).
  Physical Review Letters 12/2003; 91(24):241602. · 7.37 Impact Factor
• Source

  Available from: ArXiv

  Article: Supersymmetric contributions to the CP asymmetry of the B -> phi K_S and B -> eta' K_S

  S. Khalil, E. Kou
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  ABSTRACT: We analyse the CP asymmetry of the B -> phi K_S and B -> eta' K_S processes in general supersymmetric models. We show that chromomagnetic type of operator may play an important role in accounting for the deviation of the mixing CP asymmetry between B -> phi K_S and B -> J/psi K_S processes observed by Belle and BABAR experiments. We also show that due to the different parity in the final states of these processes, their supersymmetric contributions from the R-sector have an opposite sign, which naturally explain the large deviation between their asymmetries.
  08/2003;
• Source

  Available from: ArXiv

  Article: A possible supersymmetric solution to the discrepancy between B -> \phi K_S and B -> \eta' K_S CP asymmetries

  S. Khalil, E. Kou
  [show abstract] [hide abstract]
  ABSTRACT: We present a possible supersymmetric solution to the discrepancy between the observed mixing CP asymmetries in B -> \phi K_S and B -> \eta' K_S. We show that due to the different parity in the final states of these processes, their supersymmetric contributions from the R-sector have an opposite sign, which naturally explain the large deviation between S_{\phi K_S} and S_{\eta' K_S}. We also consider the proposed mechanisms to solve the puzzle of the observed large branching ratio of B -> \eta' K and study their impact on S_{eta' K_S}. Comment: 4 pages, 2 figures
  03/2003;
• Source

  Available from: arxiv.org

  Article: On supersymmetric contributions to the CP asymmetry of the B -> phi K_S

  S. Khalil, E. Kou
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  ABSTRACT: We analyse the CP asymmetry of the B -> phi K_S process in general supersymmetric models. In the framework of the mass insertion approximation, we derive model independent limits for the mixing CP asymmetry. We show that chromomagnetic type of operator may play an important role in accounting for the deviation of the mixing CP asymmetry between B -> phi K_S and B -> J/psi K_S processes observed by Belle and BaBar experiments. A possible correlation between the direct and mixing CP asymmetry is also discussed. Finally, we apply our result in minimal supergravity model and supersymmetric models with non-universal soft terms. Comment: 19 pages, 3 figures
  12/2002;
• Article: On supersymmetric contributions to the CP asymmetry of the B [over→] φK_ {S} process

  S. Khalil, E. Kou
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  ABSTRACT: We analyze the CP asymmetry of the B⃗φKS process in general supersymmetric models. In the framework of the mass insertion approximation, we derive model independent limits for the mixing CP asymmetry. We show that a chromomagnetic type of operator may play an important role in accounting for the deviation of the mixing CP asymmetry between B⃗φKS and B⃗J/ψKS processes observed by the Belle and BaBar experiments. A possible correlation between the direct and mixing CP asymmetry is also discussed. Finally, we apply our result in the minimal supergravity model and supersymmetric models with nonuniversal soft terms.
  Phys. Rev. D. 67(5).