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Measuring sin 2eta in Bs(t) -> phi K_s | | Alakabha Datta
; C.S. Kim
; David London
; | | Date: |
29 Mar 2001 | | Journal: | Phys.Lett. B507 (2001) 153-161 | | Subject: | hep-ph hep-ex | | Abstract: | We show that, unlike other pure b -> d penguin processes, the decay Bs(t) -> phi K_s is dominated by a single amplitude, that of the internal t-quark. The contributions of the u- and c-quark operators each vanish due to a cancellation between the (V-A) otimes (V-A) and (V-A) otimes (V+A) matrix elements. Thus, the indirect CP asymmetry in this decay probes sin 2eta. Although this cancellation is complete only for certain values of the s- and b-quark masses, the theoretical uncertainty on sin 2eta is still less than 10% over most (~80%) of the parameter space. By measuring the direct CP asymmetry, one can get a better idea of the probable error on sin 2eta. | | Source: | arXiv, hep-ph/0103321 | | Services: | Forum | Review | PDF | Favorites | |
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