The effects of the fourth generation on the double-lepton polarization in the B rightarrow K ell^+ell^- decay

doi:10.1088/0954-3899/35/6/065005

The effects of the fourth generation on the double-lepton polarization in the B → K⁺⁻ decay

V Bashiry et al 2008 J. Phys. G: Nucl. Part. Phys. 35 065005 (14pp) doi: 10.1088/0954-3899/35/6/065005

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V Bashiry¹, S M Zebarjad^2,3, F Falahati² and K Azizi³
¹ Cyprus International University, Via Mersin 10, Turkey
² Physics Department, Shiraz University, Shiraz 71454, Iran
³ Physics Department, Middle East Technical University, 06531 Ankara, Turkey
E-mail: bashiry@ipm.ir, S.M.Zebarjad@physics.susc.ac.ir, phy1g832889@shiraz.ac.ir and kazizi@newton.physics.metu.edu.tr

Abstract. This study investigates the influence of fourth-generation quarks on double-lepton polarizations in the B → K ell ⁺ ell ⁻ decay. Taking $|V_{t^{\prime}s}V_{t^{\prime}b}|\sim \{0.01-0.03\}$ with a phase of about 100°, which is consistent with the b → s ell ⁺ ell ⁻ rate and the B_s mixing parameter $\Delta m_{B_s}$ , we have found out that double-lepton (μ, τ) polarizations are quite sensitive to the existence of the fourth generation. It can serve as an efficient tool to search for new physics effects, precisely to an indirect search for the fourth-generation quarks (t', b').

Print publication: Issue 6 (June 2008)
Received 25 February 2008
Published 29 April 2008

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The effects of the fourth generation on the double-lepton polarization in the B → K⁺⁻ decay

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