Measurements of Time-Dependent CP Asymmetries in b\to s Penguin Dominated Hadronic B Decays at BaBar Page: 1 of 4
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Measurements of Time-Dependent CP
Asymmetries in bps Penguin Dominated
Hadronic B Decays at BABAR
(On behalf of the BABAR Collaboration)
University degli Studi and INFN Milano, via Celoria 16, I-20133 Milano, Italy
Abstract. We report measurements of Time-Dependent CP asymmetries in several b->s penguin
dominated hadronic B decays, where New Physics contributions may appear. We find no significant
discrepancies with respect to the Standard Model expectations.
Keywords: Charmless Hadronic B decays, Time-Dependent CP Violation, sin2$ Measurement.
PACS: 13.25.Hw, 12.15.Hh, 11.30.Er, 13.66.Bc, 14.40.Cs, 13.25.Gv, 13.25.Jx, 13.20.Jf.
The measurement of CP violation in B meson decays provides crucial tests of the
Standard Model (SM) and of the Cabibbo-Kobayashi-Maskawa (CKM) mechanism .
CKM-suppressed b--qqq s (q = u, d, s) processes are dominated by a single loop (pen-
guin) amplitude, that, assuming penguin dominance and neglecting higher order contri-
butions, is expected to have the same phase # of the CKM-favored b -> ccs transition .
In many extensions of the SM new heavy particles may appear in the loop , giving
rise to deviations from this expectation. These deviations are expected to be channel
dependent. The measurement of the phase difference between Bo- K* (892)+-- and
Bo--K*(892)-+ can be used to constrain the CKM parameters in the (j-, fi) plane .
TIME-DEPENDENT DECAY RATES
The CKM phase # is accessible experimentally through the interference between the de-
cay of mixed and unmixed B meson into a CP eigenstate. This interference is observable
through the time evolution of the decay.
In the studies reported in this presentation, one B0 from T(4S) -> BBOI is reconstructed
in i'K , i'KO, oK, or KOKK CP eigenstate, or in w+rKo or K+K-KO non-CP
eigenstate final state (Bsig), and its vertex fitted using all charged daughter tracks. In K
K K mode, where no charged track is present at B0 meson decay vertex, Bsig vertex is
identified using the K reconstructed flight directions and the knowledge of the average
interaction point . From the remaining particles in the event we reconstruct the decay
vertex of the other B meson (Btag) and identify its flavor, through the analysis of the
decay product of Btag .
Work supported in part by US Department of Energy contract DE-AC02-76SF00515.
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Biassoni, Pietro & /Milan U. /INFN, Milan. Measurements of Time-Dependent CP Asymmetries in b\to s Penguin Dominated Hadronic B Decays at BaBar, article, December 9, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc925816/m1/1/: accessed January 23, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.