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

Sanghyeon Chang, C. S. Kim, Jeonghyeon Song

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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
Volume696
Issue number4
DOIs
Publication statusPublished - 2011 Feb 7

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neutral currents
decay
misalignment
bosons
asymmetry
interactions
estimates
predictions

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

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abstract = "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.",
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The B→ΠK puzzle and the bulk Randall-Sundrum model. / Chang, Sanghyeon; Kim, C. S.; Song, Jeonghyeon.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 696, No. 4, 07.02.2011, p. 367-373.

Research output: Contribution to journalArticle

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