Testing the non-universal Z model in Bs → φ{symbol} π0 decay

Juan Hua, C. S. Kim, Ying Li

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The branching ratio and direct CP asymmetry of the decay mode Bs → φ{symbol} π0 have been calculated within the QCD factorization approach in both the standard model (SM) and the non-universal Z model. In the standard model, the CP averaged branching ratio is about 1.3 × 10- 7. Considering the effect of Z boson, we found the branching ratio can be enlarged three times or decreased to one third within the allowed parameter spaces. Furthermore, the direct CP asymmetry could reach 55 % with a light Z boson and suitable CKM phase, compared to 25 % predicted in the SM. The enhancement of both branching ratio and CP asymmetry cannot be realized at the same parameter spaces, thus, if this decay mode is measured in the upcoming LHC-b experiment and/or Super B-factories, the peculiar deviation from the SM may provide a signal of the non-universal Z model, which can be used to constrain the mass of Z boson in turn.

Original languageEnglish
Pages (from-to)508-513
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume690
Issue number5
DOIs
Publication statusPublished - 2010 Jul 5

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bosons
asymmetry
decay
industrial plants
factorization
quantum chromodynamics
deviation
augmentation

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

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abstract = "The branching ratio and direct CP asymmetry of the decay mode Bs → φ{symbol} π0 have been calculated within the QCD factorization approach in both the standard model (SM) and the non-universal Z′ model. In the standard model, the CP averaged branching ratio is about 1.3 × 10- 7. Considering the effect of Z′ boson, we found the branching ratio can be enlarged three times or decreased to one third within the allowed parameter spaces. Furthermore, the direct CP asymmetry could reach 55 {\%} with a light Z′ boson and suitable CKM phase, compared to 25 {\%} predicted in the SM. The enhancement of both branching ratio and CP asymmetry cannot be realized at the same parameter spaces, thus, if this decay mode is measured in the upcoming LHC-b experiment and/or Super B-factories, the peculiar deviation from the SM may provide a signal of the non-universal Z′ model, which can be used to constrain the mass of Z′ boson in turn.",
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Testing the non-universal Z model in Bs → φ{symbol} π0 decay. / Hua, Juan; Kim, C. S.; Li, Ying.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 690, No. 5, 05.07.2010, p. 508-513.

Research output: Contribution to journalArticle

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AB - The branching ratio and direct CP asymmetry of the decay mode Bs → φ{symbol} π0 have been calculated within the QCD factorization approach in both the standard model (SM) and the non-universal Z′ model. In the standard model, the CP averaged branching ratio is about 1.3 × 10- 7. Considering the effect of Z′ boson, we found the branching ratio can be enlarged three times or decreased to one third within the allowed parameter spaces. Furthermore, the direct CP asymmetry could reach 55 % with a light Z′ boson and suitable CKM phase, compared to 25 % predicted in the SM. The enhancement of both branching ratio and CP asymmetry cannot be realized at the same parameter spaces, thus, if this decay mode is measured in the upcoming LHC-b experiment and/or Super B-factories, the peculiar deviation from the SM may provide a signal of the non-universal Z′ model, which can be used to constrain the mass of Z′ boson in turn.

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