A Simple Approach to Fourth Generation Effects in $B\to X_s{\ell }^{+}{\ell }^{-}$ Decay

Abstract

In a scenario in which fourth generation fermions exist, we study effects of new physics on the differential decay width, forward-backward asymmetry $A_{\text{FB}}$ and integrated branching ratio for $B\to X_s{\ell }^{+}{\ell }^{-}$ decay with $(\ell =e,\mu )$. Prediction of the new physics on the mentioned quantities essentially differs from the Standard Model results, in certain regions of the parameter space, enhancement of new physics on the above mentioned physical quantities can yield values as large as two times of the SM predictions, whence present limits of experimental measurements of branching ratio is spanned, contraints of the new physics can be extracted. For the fourth generation CKM factor $V_{t^{\prime }b}^{\ast }{V}_{t^{\prime }s}$ we use $\pm 10^{-2}$ and $\pm 10^{-3}$ ranges, take into consideration the possibility of a complex phase where it may bring sizable contributions, obtained no significant dependency on the imaginary part of the new CKM factor. For the above mentioned quantities with a new family, deviations from the SM are promising, can be used as a probe of new physics.

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References in corpus (4)

• Forward--Backward Asymmetry in B -> X_s l^+ l^- at the NNLL Level
• NNLL corrections to the angular distribution and to the forward-backward asymmetries in b -> X_s l+ l-
• Measurement of the Electroweak Penguin Process B --> X(s) l+ l-
• Fourth generation effects in processes induced by "b -> s" transition

Cited by in corpus (7)

• Four Statements about the Fourth Generation
• The Effects of Fourth Generation on the Total Branching Ratio and the Lepton Polarization in $Λ_b \rar Λ\ell^+ \ell^-$ decay
• Double Lepton Polarization in ${\Lambda }_b-->\Lambda l^{+}{l}^{-}$ Decay in the Standard Model with Fourth Generations Scenario
• CP asymmetry in the decays B --> (X_s, X_d) mu+ mu- with four generations
• Signature of new physics in B -> phi pi decay
• Double Lepton Polarization Forward--Backward Asymmetries in B \rar K^\ast \ell^+ \ell^- Decay in the SM4
• Analysis of the B --> π\ell^+ \ell^- Decay in the Standard Model with Fourth Generation