Double Lepton Polarization in $Λ_b -->Λl^+ l^-$ Decay in the Standard Model with Fourth Generations Scenario

Details Double Lepton Polarization in $Λ_b -->Λl^+ l^-$ Decay in the Standard Model with Fourth Generations Scenario Double Lepton Polarization in $Λ_b -->Λl^+ l^-$ Decay in the Standard Model with Fourth Generations Scenario

2007-07-30

arxiv.org/abs/0707.4337v1

Nucl.Phys.B796:294-319,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

36 pages, 33 figures

Scientific paper

10.1016/j.nuclphysb.2007.12.022

This study investigates the influence of the fourth generation quarks on the double lepton polarizations in \Lambda_b --> \Lambda \ell^+ \ell^- decay by taking |V^\ast_{t's}V_{t'b}|= 0.005,0.01,0.02,0.03 with phase \{60^\circ,90^\circ,120^\circ\}. We will try to obtain a constrain on the mass of the 4th generation top like quark t', which is consistent with the $b--> s\ell^+\ell^- rate . With the above mentioned parameters, we will try to show that the double lepton(muon, tau) polarizations are quite sensitive to the existence of fourth generation. It can serve as a good tool to search for new physics effects, precisely, to search for the fourth generation quarks(t', b') via its indirect manifestations in loop diagrams.

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