Fourth generation effect on ${\Lambda }_b$ decays

Abstract

The rare decays of ${\Lambda }_b$ baryon governed by the quark level transitions $b\to s$, are investigated in the fourth quark generation model popularly known as SM4. Recently it has been shown that SM4, which is a very simple extension of the standard model, can successfully explain several anomalies observed in the CP violation parameters of $B$ and $B_s$ mesons. We find that in this model due to the additional contributions coming from the heavy $t^{\prime }$ quark in the loop, the branching ratios and other observables in rare ${\Lambda }_b$ decays deviate significantly from their SM values. Some of these modes are within the reach of LHCb experiment and search for such channels are strongly argued.

19 pages, 7 figures, typos corrected, published version

References in corpus (11)

• Delta F=2 Observables and Fine-Tuning in a Warped Extra Dimension with Custodial Protection
• Rare K and B Decays in a Warped Extra Dimension with Custodial Protection
• The discovery of the fourth family at the LHC: what if?
• Large Time-dependent CP Violation in B_s^0 System and Finite D^0-D^0bar Mass Difference in Four Generation Standard Mode
• Patterns of Flavour Violation in the Presence of a Fourth Generation of Quarks and Leptons
• Fourth Generation CP Violation Effect on B -> K pi, phi K and rho K in NLO PQCD
• Explaining B \to K pi anomaly with non-universal Z' boson
• Rare decays of ${\Lambda }_b\to \Lambda \gamma$ and ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ in universal extra dimension model
• Four Generation CP Violation in B -> phi K^0, pi^0 K^0, eta' K^0 and Hadronic Uncertainties
• $B_s^0-{\bar{B}}_s^0$ mixing and $b\to s$ transitions in isosinglet down quark model
• Fourth Generation Leptons and Muon $g-2$

Cited by in corpus (9)

• Measurement of the differential branching fraction of the decay ${\Lambda }_b^0\to \Lambda {\mu }^{+}{\mu }^{-}$
• Measurements of Direct CP-Violating Asymmetries in Charmless Decays of Bottom Baryons
• Effects of scalar leptoquark on semileptonic ${\Lambda }_b$ decays
• Searches for the $t^{\prime }$ of a fourth family
• Study of some rare decays of B_s meson in the fourth generation model
• Rare baryonic decays ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ in the TTM model
• Analysis of ${\Lambda }_b\to$ $p{K}^{-}$ and $p{\pi }^{-}$ decays in a flavor changing $Z^{\prime }$ model
• Study of some B_s to f_0(980) decays in the fourth generation model
• Bounds on fourth generation induced Lepton Flavour Violating double insertions in Supersymmetry