Amplitude analysis and measurement of the time-dependent CP asymmetry of $B^0 \to K_0^S K_0^S K_0^S$ decays
J. P. Lees
(1)
,
V. Poireau
(1)
,
V. Tisserand
(1)
,
D. Bernard
(2)
,
M. Verderi
(2)
,
S. Emery
(3)
,
G. Hamel de Monchenault
(3)
,
G. Vasseur
(3)
,
Ch. Yèche
(3)
,
N. Arnaud
(4)
,
M. Davier
(4)
,
G. Grosdidier
(4)
,
F. Le Diberder
(4)
,
A.M. Lutz
(4)
,
B. Malaescu
(4)
,
P. Roudeau
(4)
,
M.H. Schune
(4)
,
A. Stocchi
(4)
,
G. Wormser
(4)
,
S. Akar
,
E. Ben-Haim
(5)
,
M. Bomben
(5)
,
G.R. Bonneaud
(5)
,
H. Briand
(5)
,
G. Calderini
(5)
,
J. Chauveau
(5)
,
O. Hamon
(5)
,
Ph. Leruste
(5)
,
G. Marchiori
(5)
,
J. Ocariz
(5)
,
S. Sitt
(5)
G. Vasseur
- Fonction : Auteur
- PersonId : 745439
- IdHAL : georges-vasseur
N. Arnaud
- Fonction : Auteur
- PersonId : 16841
- IdHAL : nicolas-arnaud
- ORCID : 0000-0001-6589-8673
S. Akar
- Fonction : Auteur
G. Calderini
- Fonction : Auteur
- PersonId : 10608
- IdHAL : giovanni-calderini
- ORCID : 0000-0002-9495-9145
- IdRef : 172243211
G. Marchiori
- Fonction : Auteur
- PersonId : 741274
- IdHAL : giovanni-marchiori
- ORCID : 0000-0003-2655-7643
- IdRef : 180997203
Résumé
We present the first results on the Dalitz-plot structure and improved measurements of the time-dependent CP-violation parameters of the process $B^0 \rightarrow K^0_S K^0_S K^0_S$ obtained using $468\times10^{6}$ $B\bar{B}$ decays collected with the BABAR detector at the PEP-II asymmetric-energy $B$ factory at SLAC. The Dalitz-plot structure is probed by a time-integrated amplitude analysis that does not distinguish between $B^0$ and $\bar{B}^0$ decays. We measure the total inclusive branching fraction ${\cal B}($B^0$ \rightarrow K^0_S K^0_S K^0_S)=\rm (6.19 \pm 0.48 \pm 0.15 \pm 0.12)\times 10^{-6}$, where the first uncertainty is statistical, the second is systematic, and the third represents the Dalitz-plot signal model dependence. We also observe evidence for the intermediate resonant states $f_0(980)$, $f_0(1710)$, and $f_2(2010)$. Their respective product branching fractions are measured to be $\rm(2.70\,^{+1.25}_{-1.19} \pm 0.36 \pm 1.17)\times 10^{-6}$, $\rm(0.50\,^{+0.46}_{-0.24} \pm 0.04 \pm 0.10)\times 10^{-6}$, and $\rm(0.54\,^{+0.21}_{-0.20} \pm 0.03 \pm 0.52)\times 10^{-6}$. Additionally, we determine the mixing-induced CP-violation parameters to be ${\cal S} = -0.94\,^{+0.24}_{-0.21} \pm 0.06 $ and ${\cal C} = -0.17 \pm 0.18 \pm 0.04 $, where the first uncertainty is statistical and the second is systematic. These values are in agreement with the standard model expectation.