BABAR Collaboration (Including:

). (2008) Improved measurement of CP observables in B-+/-->(DCPK +/-)-K-0 decays. Physical Review D (Particles, Fields, Gravitation and Cosmology), Vol.77 (No.11). article no. 111102. ISSN 1550-7998

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Abstract

We present a study of the decay B-->(D(CP)K-)-K-0 and its charge conjugate, where D-(CP)(0) is reconstructed in both a non-CP flavor eigenstate and in CP (CP-even and CP-odd) eigenstates, based on a sample of 382 million Upsilon(4S) -> B (B) over bar decays collected with the BABAR detector at the PEP-II e(+)e(-) storage ring. We measure the direct CP asymmetries A(CP +/-) and the ratios of the branching fractions R-CP +/-: A(CP+)=0.27 +/- 0.09(stat) +/- 0.04(syst), A(CP-)=-0.09 +/- 0.09(stat) +/- 0.02(syst), RCP+=1.06 +/- 0.10(stat) +/- 0.05(syst), RCP-=1.03 +/- 0.10(stat) +/- 0.05(syst). We also express the results in terms of the so-called Cartesian coordinates x(+), x(-), and r(2): x(+)=-0.09 +/- 0.05(stat) +/- 0.02(syst), x(-)=0.10 +/- 0.05(stat) +/- 0.03(syst), r(2)=0.05 +/- 0.07(stat)+/- 0.03(syst). These results will help to better constrain the phase parameter gamma=arg(-VudVub*/VcdVcb*) of the Cabibbo-Kobayashi-Maskawa quark mixing matrix.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Physical Review D (Particles, Fields, Gravitation and Cosmology)
Publisher:	American Physical Society
ISSN:	1550-7998
Date:	June 2008
Volume:	Vol.77
Number:	No.11
Number of Pages:	8
Page Range:	article no. 111102
Identification Number:	10.1103/PhysRevD.77.111102
Status:	Peer Reviewed
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/29704

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