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

Juan Hua, C. S. Kim, Ying Li

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


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
Issue number5
Publication statusPublished - 2010 Jul 5

Bibliographical note

Funding Information:
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 ) and in part by KOSEF through the Joint Research Program ( F01-2009-000-10031-0 ). The work of Y.L. was supported by the Brain Korea 21 Project and by the National Science Foundation under contract Nos. 10805037 and 10625525 .

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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