Precise measurement of the CP violation parameter $\sin2\phi_1$ in $B^0\to(c\bar c)K^0$ decays - INSPIRE

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Precise measurement of the CP violation parameter $\sin2\phi_1$ in $B^0\to(c\bar c)K^0$ decays

Belle

Collaboration

Jan 23, 2012

7 pages

Published in:

Phys.Rev.Lett. 108 (2012) 171802

Published: Jan 23, 2012

e-Print:

1201.4643 [hep-ex]

DOI:

10.1103/PhysRevLett.108.171802

PDG: sin

(2\beta )

Experiments:

KEK-BF-BELLE

View in:

reference search193 citations

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Abstract: (arXiv)

We present a precise measurement of the CP violation parameter sin2phi_1 and the direct CP violation parameter A_f using the final data sample of 772x10^6 B\bar B pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. One neutral B meson is reconstructed in a J/psi K0S, psi(2S) K0S, chi_c1 K0S or J/psi K0L CP-eigenstate and its flavor is identified from the decay products of the accompanying B meson. From the distribution of proper time intervals between the two B decays, we obtain the following CP violation parameters: sin2phi_1=0.667+-0.023(stat)+-0.012(syst) and A_f=0.006+-0.016(stat)+-0.012(syst).

12.15.Hh
11.30.Er
13.25.Hw
electron positron: annihilation
B: pair production
B0: hadronic decay
CP: violation
particle identification: flavor
CKM matrix: unitarity
asymmetry: CP

References(24)

Figures(1)

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