The B→ΠK puzzle and the bulk Randall-Sundrum model

Sanghyeon Chang, C. S. Kim, Jeonghyeon Song

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3 Citations (Scopus)


The recent measurements of the direct CP asymmetries (ACP) in the penguin-dominated B→KΠ decays show some discrepancy from the standard model (SM) prediction. While ACP of B+→π0K+ and that of B0→π-K+ in the naive estimate of the SM are expected to have very similar values, their experimental data are of the opposite sign and different magnitudes. We study the effects of the custodial bulk Randall-Sundrum model on this ACP. In this model, the misalignment of the five-dimensional (5D) Yukawa interactions to the 5D bulk gauge interactions in flavor space leads to tree-level flavor-changing neutral current by the Kaluza-Klein gauge bosons. In a large portion of the parameter space of this model, the observed non-zero ACP(B+→π0K+)-ACP(B0→π-K+) can be explained only with low Kaluza-Klein mass scale MKK around 1 TeV. Rather extreme parameters is required to explain it with MKKb≃3TeV. The new contributions to well-measured branching ratios of B→Kπ decays are also shown to be suppressed.

Original languageEnglish
Pages (from-to)367-373
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number4
Publication statusPublished - 2011 Feb 7

Bibliographical note

Funding Information:
The work of S.C. was supported by the Korea Research Foundation Grant. ( KRF-2008-359-C00011 ). The work of C.S.K. was supported in part by Basic Science Research Program through the NRF of Korea funded by MOEST ( 2009-0088395 ), in part by KOSEF through the Joint Research Program ( F01-2009-000-10031-0 ). The work of J.S. was supported by the WCU program through the KOSEF funded by the MEST ( R31-2008-000-10057-0 ).

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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