Measurement of CP violating asymmetries in $B^0 -> K^+K^- K^0_S$ decays with a time-dependent Dalitz approach - INSPIRE

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Measurement of CP violating asymmetries in $B^0 -> K^+K^- K^0_S$ decays with a time-dependent Dalitz approach

Belle

Collaboration

•

Y. Nakahama
(
- Tokyo U.
)

Jul, 2010

13 pages

Published in:

Phys.Rev.D 82 (2010) 073011

e-Print:

1007.3848 [hep-ex]

DOI:

10.1103/PhysRevD.82.073011

PDG:

\mathit C_{{{\mathit f}_{{{0}}}{(980)}} {{\mathit K}_S^0} }

{{\mathit B}^{0}}

\rightarrow

{{\mathit f}_{{{0}}}{(980)}}{{\mathit K}_S^0}

Experiments:

KEK-BF-BELLE

View in:

ADS Abstract Service

reference search83 citations

Citations per year

Abstract: (arXiv)

We report a measurement of

CP

violating asymmetries in

B^0(\overline{B}^0) \to K^+ K^- K^0_S

decays with a time-dependent Dalitz approach. This analysis is based on a data sample of

657\times 10^6

B\overline{B}

pairs accumulated at the

\Upsilon(4S)

resonance with the Belle detector at the KEKB asymmetric-energy

e^+e^-

collider. As the result of an unbinned maximum likelihood fit to the selected candidates, the mixing-induced and direct

CP

violation parameters,

\phi^{\rm eff}_1

and

{\cal A}_{CP}

are obtained for

B^0 \to \phi(1020) K^0_S

,

B^0 \to f_0(980) K^0_S

and other

B^0 \to K^+ K^- K^0_S

decays. We find four solutions that describe the data. There are \{eqnarray*} \phi_1^{\rm eff}(B^0\to \phi(1020) K^0_S) & = & (32.2 \pm 9.0 \pm 2.6 \pm 1.4)^{\circ}/ \phi_1^{\rm eff}(B^0\to \phi(1020) K^0_S) & = & (26.2 \pm 8.8 \pm 2.7 \pm 1.2)^{\circ}/\\ \phi_1^{\rm eff}(B^0\to \phi(1020) K^0_S) & = & (27.3 \pm 8.6 \pm 2.8 \pm 1.3)^{\circ}\/ {\rm and}\\ \phi_1^{\rm eff}(B^0\to \phi(1020) K^0_S) & = & (24.3 \pm 8.0 \pm 2.9 \pm 5.2)^{\circ}.{eqnarray*}\ The values for the

CP

violating phase in

B^0\to \phi(1020) K^0_S

are similar but other properties of the Dalitz plot are quite different for the four solutions. These four solutions have consistent

\phi^{\rm eff}_1

values for all three

B

meson decay channels and none of them deviates significantly from the values measured in

B \to (c\bar{c}) K^0

decays with the currently available statistics. In addition, we find no significant direct

CP

violation.

12.15.Hh
13.25.Hw
B0: hadronic decay
CP: violation
time dependence
Dalitz plot
BELLE
KEK-B
electron positron: annihilation
B: pair production

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