Rare decays of $Λ_b \to Λγ$ and $Λ_b \to Λ l^{+} l^{-}$ in universal extra dimension model

Details Rare decays of $Λ_b \to Λγ$ and $Λ_b \to Λ l^{+} l^{-}$ in universal extra dimension model Rare decays of $Λ_b \to Λγ$ and $Λ_b \to Λ l^{+} l^{-}$ in universal extra dimension model

2008-10-03

arxiv.org/abs/0810.0609v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages, 6 figures, two references added

Scientific paper

10.1140/epjc/s10052-008-0835-8

The exclusive weak decay of $\Lambda_b \to \Lambda \gamma$ and $\Lambda_b \to \Lambda l^{+} l^{-}$ are investigated in the Applequist-Cheng-Dobrescu model, which is an extension of the standard model in presence of universal extra dimensions. Employing the transition form factors obtained in the light-cone sum rues, we analyze how the invariant mass distribution, forward-backward asymmetry and polarization asymmetry of $\Lambda$ baryon of these decay modes can be used to constrain the only one additional free parameter with respect to the standard model, namely, the radius $R$ of the extra dimension. Our results indicate that the Kaluza-Klein modes can lead to approximately 25% suppression of the branching ratio of $\Lambda_b \to \Lambda \gamma$, however, their contributions can bring about 10% enhancement to the decay rate of $\Lambda_b \to \Lambda l^{+} l^{-}$. It is shown that the zero-position of forward-backward asymmetry of $\Lambda_b \to \Lambda \mu^{+} \mu^{-}$ is sensitive to the compactification parameter $R$ in this scenario, while the measurement of polarizations of $\Lambda$ baryon in the $\Lambda_b$ decays is not suitable to provide some valuable information for the universal extra dimension model.

Affiliated with

Also associated with

No associations

Rating

Rare decays of $Λ_b \to Λγ$ and $Λ_b \to Λ l^{+} l^{-}$ in universal extra dimension model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Rare decays of $Λ_b \to Λγ$ and $Λ_b \to Λ l^{+} l^{-}$ in universal extra dimension model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rare decays of $Λ_b \to Λγ$ and $Λ_b \to Λ l^{+} l^{-}$ in universal extra dimension model will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-409659