TY - JOUR
T1 - Improved measurement of CP observables in B^{±}→D_{CP}^{0}K^{±} decays
AU - Aubert, B
AU - Hawkes, Christopher
AU - Soni, Nitesh
AU - Watson, Alan
PY - 2008/6/1
Y1 - 2008/6/1
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevD.77.111102
DO - 10.1103/PhysRevD.77.111102
M3 - Article
SN - 1550-7998
VL - 77
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 11
M1 - 111102
ER -