-
CLEO Collaboration,
D. M. Asner,
G. Tatishvili,
J. Y. Ge,
D. H. Miller,
I. P. J. Shipsey,
B. Xin,
G. S. Adams,
J. Napolitano,
K. M. Ecklund, [......],
D. Cronin-Hennessy, J. Hietala,
S. Dobbs,
Z. Metreveli,
K. K. Seth,
A. Tomaradze,
T. Xiao,
A. Powell,
C. Thomas,
G. Wilkinson
[show abstract]
[hide abstract]
ABSTRACT: We analyze a sample of 3 million quantum-correlated D0 D0bar pairs from 818
pb^-1 of e+e- collision data collected with the CLEO-c detector at E_cm = 3.77
GeV, to give an updated measurement of \cos\delta and a first determination of
\sin\delta, where \delta is the relative strong phase between doubly
Cabibbo-suppressed D0 --> K+pi- and Cabibbo-favored D0bar --> K+pi- decay
amplitudes. With no inputs from other experiments, we find \cos\delta = 0.81
+0.22+0.07 -0.18-0.05, \sin\delta = -0.01 +- 0.41 +- 0.04, and |\delta| = 10
+28+13 -53-0 degrees. By including external measurements of mixing parameters,
we find alternative values of \cos\delta = 1.15 +0.19+0.00 -0.17-0.08,
\sin\delta = 0.56 +0.32+0.21 -0.31-0.20, and \delta = (18 +11-17) degrees. Our
results can be used to improve the world average uncertainty on the mixing
parameter y by approximately 10%.
10/2012;
-
L Tuominen,
J Salo,
J Hirvonen,
K Någren,
P Laine,
T Melartin,
E Isometsä,
J Viikari,
C R Cloninger,
O Raitakari, J Hietala,
L Keltikangas-Järvinen
[show abstract]
[hide abstract]
ABSTRACT: BACKGROUND: The psychobiological model of personality by Cloninger and colleagues originally hypothesized that interindividual variability in the temperament dimension 'harm avoidance' (HA) is explained by differences in the activity of the brain serotonin system. We assessed brain serotonin transporter (5-HTT) density in vivo with positron emission tomography (PET) in healthy individuals with high or low HA scores using an 'oversampling' study design. Method Subjects consistently in either upper or lower quartiles for the HA trait were selected from a population-based cohort in Finland (n=2075) with pre-existing Temperament and Character Inventory (TCI) scores. A total of 22 subjects free of psychiatric and somatic disorders were included in the matched high- and low-HA groups. The main outcome measure was regional 5-HTT binding potential (BPND) in high- and low-HA groups estimated with PET and [11C]N,N-dimethyl-2-(2-amino-4-methylphenylthio)benzylamine ([11C]MADAM). In secondary analyses, 5-HTT BPND was correlated with other TCI dimensions. RESULTS: 5-HTT BPND did not differ between high- and low-HA groups in the midbrain or any other brain region. This result remained the same even after adjusting for other relevant TCI dimensions. Higher 5-HTT BPND in the raphe nucleus predicted higher scores in 'self-directedness'. CONCLUSIONS: This study does not support an association between the temperament dimension HA and serotonin transporter density in healthy subjects. However, we found a link between high serotonin transporter density and high 'self-directedness' (ability to adapt and control one's behaviour to fit situations in accord with chosen goals and values). We suggest that biological factors are more important in explaining variability in character than previously thought.
Psychological Medicine 07/2012; · 6.16 Impact Factor
-
J. Insler,
H. Muramatsu,
C. S. Park,
L. J. Pearson,
E. H. Thorndike,
S. Ricciardi,
C. Thomas,
M. Artuso,
S. Blusk,
R. Mountain, [......],
G. Wilkinson,
D. M. Asner,
G. Tatishvili,
J. Y. Ge,
D. H. Miller,
I. P. J. Shipsey,
B. Xin,
G. S. Adams,
J. Napolitano,
K. M. Ecklund
[show abstract]
[hide abstract]
ABSTRACT: The first measurements of the coherence factor RKS0Kπ and the average strong-phase difference δDKS0Kπ in D0→KS0K∓π± decays are reported. These parameters can be used to improve the determination of the unitary triangle angle γ in B-→D˜K- decays, where D˜ is either a D0 or a D̅ 0 meson decaying to the same final state, and also in studies of charm mixing. The measurements of the coherence factor and strong-phase difference are made using quantum-correlated, fully reconstructed D0D̅ 0 pairs produced in e+e- collisions at the ψ(3770) resonance. The measured values are RKS0Kπ=0.73±0.08 and δDKS0Kπ=(8.3±15.2)° for an unrestricted kinematic region and RK*K=1.00±0.16 and δDK*K=(26.5±15.8)° for a region where the combined KS0π± invariant mass is within 100 MeV/c2 of the K*(892)± mass. These results indicate a significant level of coherence in the decay. In addition, isobar models are presented for the two decays, which show the dominance of the K*(892)± resonance. The branching ratio B(D0→KS0K+π-)/ B(D0→KS0K-π+) is determined to be 0.592±0.044(stat)±0.018(syst), which is more precise than previous measurements.
Phys. Rev. D. 05/2012; 85(9).
-
CLEO Collaboration,
J. Insler,
H. Muramatsu,
C. S. Park,
L. J. Pearson,
E. H. Thorndike,
S. Ricciardi,
C. Thomas,
M. Artuso,
S. Blusk, [......],
G. Wilkinson,
D. M. Asner,
G. Tatishvili,
J. Y. Ge,
D. H. Miller,
I. P. J. Shipsey,
B. Xin,
G. S. Adams,
J. Napolitano,
K. M. Ecklund
[show abstract]
[hide abstract]
ABSTRACT: The first measurements of the coherence factor R_{K_S^0K\pi} and the average
strong--phase difference \delta^{K_S^0K\pi} in D^0 \to K_S^0 K^\mp\pi^\pm
decays are reported. These parameters can be used to improve the determination
of the unitary triangle angle \gamma in B^- \rightarrow \widetilde{D}K^-$
decays, where $\widetilde{D}$ is either a D^0 or a D^0-bar meson decaying to
the same final state, and also in studies of charm mixing. The measurements of
the coherence factor and strong-phase difference are made using
quantum-correlated, fully-reconstructed D^0D^0-bar pairs produced in e^+e^-
collisions at the \psi(3770) resonance. The measured values are R_{K_S^0K\pi} =
0.73 \pm 0.08 and \delta^{K_S^0K\pi} = (8.3 \pm 15.2)$^\circ$ for an
unrestricted kinematic region and R_{K*K} = 1.00 \pm 0.16 and \delta^{K*K} =
(26.5 \pm 15.8)$^\circ$ for a region where the combined K_S^0 \pi^\pm invariant
mass is within 100 MeV/c^2 of the K^{*}(892)^\pm mass. These results indicate a
significant level of coherence in the decay. In addition, isobar models are
presented for the two decays, which show the dominance of the K^*(892)^\pm
resonance. The branching ratio {B}(D^0 \rightarrow K_S^0K^+\pi^-)/{B}(D^0
\rightarrow K_S^0K^-\pi^+) is determined to be 0.592 \pm 0.044 (stat.) \pm
0.018 (syst.), which is more precise than previous measurements.
03/2012;
-
M. Artuso,
S. Blusk,
R. Mountain,
T. Skwarnicki,
S. Stone,
L. M. Zhang,
T. Gershon,
G. Bonvicini,
D. Cinabro,
A. Lincoln, [......],
G. S. Adams,
J. Napolitano,
K. M. Ecklund,
J. Insler,
H. Muramatsu,
C. S. Park,
L. J. Pearson,
E. H. Thorndike,
S. Ricciardi,
C. Thomas
[show abstract]
[hide abstract]
ABSTRACT: The first flavor-tagged amplitude analysis of the decay D0 to the
self-conjugate final state K+K-pi+pi- is presented. Data from the CLEO II.V,
CLEO III, and CLEO-c detectors are used, from which around 3000 signal decays
are selected. The three most significant amplitudes, which contribute to the
model that best fits the data, are phirho0, K1(1270)+-K-+, and non-resonant
K+K-pi+pi-. Separate amplitude analyses of D0 and D0-bar candidates indicate no
CP violation among the amplitudes at the level of 5% to 30% depending on the
mode. In addition, the sensitivity to the CP-violating parameter gamma/phi3 of
a sample of 2000 B+ -> D0-tilde(K+K-pi+pi-)K+ decays, where D0-tilde is a D0 or
D0-bar, collected at LHCb or a future flavor facility, is estimated to be (11.3
+/- 0.3) degrees using the favored model.
01/2012;
-
G. S. Adams,
J. Napolitano,
K. M. Ecklund,
J. Insler,
H. Muramatsu,
C. S. Park,
L. J. Pearson,
E. H. Thorndike,
S. Ricciardi,
C. Thomas, [......],
K. K. Seth,
A. Tomaradze,
T. Xiao,
L. Martin,
A. Powell,
G. Wilkinson,
J. Y. Ge,
D. H. Miller,
I. P. J. Shipsey,
B. Xin
[show abstract]
[hide abstract]
ABSTRACT: Using a data sample of 2.59×107 ψ(2S) decays obtained with the CLEO-c detector, we perform amplitude analyses of the complementary decay chains ψ(2S)→γχc1; χc1→ηπ+π- and ψ(2S)→γχc1; χc1→η′π+π-. We find evidence for an exotic P-wave η′π amplitude, which, if interpreted as a resonance, would have parameters consistent with the π1(1600) state reported in other production mechanisms. We also make the first observation of the decay a0(980)→η′π and measure the ratio of branching fractions B(a0(980)→η′π)/B(a0(980)→ηπ)=0.064±0.014±0.014. The ππ spectrum produced with a recoiling η is compared to that with η′ recoil.
Phys. Rev. D. 12/2011; 84(11).
-
CLEO Collaboration,
S. Dobbs,
Z. Metreveli,
K. K. Seth,
A. Tomaradze,
T. Xiao,
L Martin,
A. Powell,
G Wilkinson,
H. Mendez, [......],
M. Selen,
J. Wiss,
J Libby,
M. Kornicer,
R. E. Mitchell,
C. M. Tarbert,
D. Besson,
T. K. Pedlar,
D. Cronin-Hennessy, J. Hietala
[show abstract]
[hide abstract]
ABSTRACT: Using the entire CLEO-c psi(3770) to DDbar event sample, corresponding to an
integrated luminosity of 818 pb^-1 and approximately 5.4 x 10^6 DDbar events,
we measure the form factors for the decays D0 to rho- e+ nu_e and D+ to rho0 e+
nu_e for the first time and the branching fractions with improved precision. A
four-dimensional unbinned maximum likelihood fit determines the form factor
ratios to be: V(0)/A_1(0) = 1.48 +- 0.15 +- 0.05 and A_2(0)/A_1(0)= 0.83 +-
0.11 +- 0.04. Assuming CKM unitarity, the known D meson lifetimes and our
measured branching fractions we obtain the form factor normalizations A_1(0),
A_2(0), and V(0). We also present a measurement of the branching fraction for
D^+ to omega e^+ nu_e with improved precision.
12/2011;
-
N. Lowrey,
S. Mehrabyan,
M. Selen,
J. Wiss,
J. Libby,
M. Kornicer,
R. E. Mitchell,
M. R. Shepherd,
C. M. Tarbert,
D. Besson, [......],
V. E. Kuznetsov,
J. R. Patterson,
D. Peterson,
D. Riley,
A. Ryd,
A. J. Sadoff,
X. Shi,
W. M. Sun,
J. Yelton,
P. Rubin
[show abstract]
[hide abstract]
ABSTRACT: We present the results of a Dalitz plot analysis of D0→KS0π0π0 using the CLEO-c data set of 818 pb-1 of e+e- collisions accumulated at √s=3.77 GeV. This corresponds to 3×106 D0D̅ 0 pairs from which we select 1259 tagged candidates with a background of 7.5±0.9 percent. Several models have been explored, all of which include the K*(892), K2*(1430), K*(1680), the f0(980), and the σ(500). We find that the combined π0π0 S-wave contribution to our preferred fit is (28.9±6.3±3.1)% of the total decay rate while D0→K̅ *(892)0π0 contributes (65.6±5.3±2.5)%. Using three tag modes and correcting for quantum correlations we measure the D0→KS0π0π0 branching fraction to be (1.058±0.038±0.073)%.
Phys. Rev. D. 11/2011; 84(9).
-
CLEO Collaboration,
G. S. Adams,
J. Napolitano,
K. M. Ecklund,
J. Insler,
H. Muramatsu,
C. S. Park,
L. J. Pearson,
E. H. Thorndike,
S. Ricciardi, [......],
K. K. Seth,
A. Tomaradze,
T. Xiao,
L. Martin,
A. Powell,
G. Wilkinson,
J. Y. Ge,
D. H. Miller,
I. P. J. Shipsey,
B. Xin
[show abstract]
[hide abstract]
ABSTRACT: Using a data sample of 2.59 x 10^7 psi(2S) decays obtained with the CLEO-c
detector, we perform amplitude analyses of the complementary decay chains
chi_c1 -> eta pi+ pi- and chi_c1 -> eta' pi+ pi-. We find evidence for a P-wave
eta' pi scattering amplitude, which, if interpreted as a resonance, would have
exotic J^PC = 1^-+ and parameters consistent with the pi_1(1600) state reported
in other production mechanisms. We also make the first observation of the decay
a_0(980) -> eta' pi and measure the ratio of branching fractions B(a_0(980) ->
eta' pi)/B(a_0(980) -> eta pi) = 0.064 +- 0.014 +- 0.014. The pi pi spectrum
produced with a recoiling eta is compared to that with eta' recoil.
09/2011;
-
J. Y. Ge,
D. H. Miller,
I. P. J. Shipsey,
B. Xin,
G. S. Adams,
J. Napolitano,
K. M. Ecklund,
J. Insler,
H. Muramatsu,
C. S. Park, [......],
D. Cronin-Hennessy, J. Hietala,
S. Dobbs,
Z. Metreveli,
K. K. Seth,
A. Tomaradze,
T. Xiao,
L. Martin,
A. Powell,
G. Wilkinson
[show abstract]
[hide abstract]
ABSTRACT: Using e+e- collision data corresponding to 5.88×106Υ(3S) [25.9×106ψ(2S)] decays and acquired by the CLEO III [CLEO-c] detectors operating at the Cornell Electron Storage Ring, we study the single-pion transitions from Υ(3S)[ψ(2S)] to the respective spin-singlet states hb[c]. Utilizing only the momentum of suitably selected transition-π0 candidates, we obtain the upper limit B(Υ(3S)→π0hb)<1.2×10-3 at 90% confidence level, and measure B(ψ(2S)→π0hc)=(9.0±1.5±1.3)×10-4. Signal sensitivities are enhanced by excluding very asymmetric π0→γγ candidates.
Phys. Rev. D. 08/2011; 84(3).
-
T K Pedlar,
D Cronin-Hennessy, J Hietala,
S Dobbs,
Z Metreveli,
K K Seth,
A Tomaradze,
T Xiao,
L Martin,
A Powell, [......],
N Lowrey,
S Mehrabyan,
M Selen,
J Wiss,
J Libby,
M Kornicer,
R E Mitchell,
M R Shepherd,
C M Tarbert,
D Besson
[show abstract]
[hide abstract]
ABSTRACT: Using 586 pb(-1) of e+ e- collision data at E(c.m.) = 4170 MeV, produced at the Cornell Electron Storage Ring collider and collected with the CLEO-c detector, we observe the process e+ e- → π+ π- h(c)(1P). We measure its cross section to be 15.6±2.3±1.9±3.0 pb, where the third error is due to the external uncertainty on the branching fraction of ψ(2S) → π0 h(c)(1P), which we use for normalization. We also find evidence for e+ e- → ηh(c)(1P) at 4170 MeV at the 3σ level and see hints of a rise in the e+ e- → π+ π- h(c)(1P) cross section at 4260 MeV.
Physical Review Letters 07/2011; 107(4):041803. · 7.37 Impact Factor
-
CLEO Collaboration,
J. Y. Ge,
D H Miller,
I. P. J. Shipsey,
B. Xin,
G. S. Adams,
J. Napolitano,
K. M. Ecklund,
J. Insler,
H Muramatsu, [......],
D. Cronin-Hennessy, J. Hietala,
S. Dobbs,
Z. Metreveli,
K. K. Seth,
A. Tomaradze,
T. Xiao,
L Martin,
A. Powell,
G Wilkinson
[show abstract]
[hide abstract]
ABSTRACT: Using e^+e^- collision data corresponding to 5.88M Y(3S) [25.9M psi(2S)]
decays and acquired by the CLEO III [CLEO-c] detectors operating at CESR, we
study the single-pion transitions from Y(3S) [psi(2S)] to the respective
spin-singlet states h_{b[c]}. Utilizing only the momentum of suitably selected
transition-pi^0 candidates, we obtain the upper limit B(Y(3S) -> pi^0 h_b) <
1.2\times 10^{-3} at 90% confidence level, and measure B(psi(2S) -> pi^0 h_c) =
(9.0+-1.5+-1.3)\times 10^{-4}. Signal sensitivities are enhanced by excluding
very asymmetric pi^0 -> gamma gamma candidates.
06/2011;
-
CLEO Collaboration,
N. Lowrey,
S. Mehrabyan,
M. Selen,
J. Wiss,
J Libby,
M. Kornicer,
R. E. Mitchell,
M. R. Shepherd,
C. M. Tarbert, [......],
V. E. Kuznetsov,
J. R. Patterson,
D Peterson,
D Riley,
A Ryd,
A. J. Sadoff,
X Shi,
W. M. Sun,
J Yelton,
P Rubin
[show abstract]
[hide abstract]
ABSTRACT: We present the results of a Dalitz plot analysis of D^0 to K^0_S pi^0 pi^0
using the CLEO-c data set of 818 inverse pico-barns of e^+ e^- collisions
accumulated at sqrt{s} = 3.77 GeV. This corresponds to three million D^0
D^0-bar pairs from which we select 1,259 tagged candidates with a background of
7.5 +- 0.9 percent. Several models have been explored, all of which include the
K^*(892), K^*_2(1430), K^*(1680), the f_0(980), and the sigma(500). We find
that the combined pi^0 pi^0 S-wave contribution to our preferred fit is (28.9
+- 6.3 +- 3.1)% of the total decay rate while D^0 to K^*(892)^0 pi^0
contributes (65.6 +- 5.3 +- 2.5)%. Using three tag modes and correcting for
quantum correlations we measure the D^0 to K^0_S pi^0 pi^0 branching fraction
to be (1.059 +- 0.038 +- 0.061)%.
06/2011;
-
CLEO Collaboration,
L Martin,
A. Powell,
G Wilkinson,
J. Y. Ge,
D H Miller,
I. P. J. Shipsey,
B. Xin,
G. S. Adams,
B. Moziak, [......],
R. E. Mitchell,
D. Besson,
T. K. Pedlar,
D. Cronin-Hennessy, J. Hietala,
S. Dobbs,
Z. Metreveli,
K. K. Seth,
A. Tomaradze,
T. Xiao
[show abstract]
[hide abstract]
ABSTRACT: We present the first search for the decay $D^+_{s}\to \omega e^{+}\nu$ to
test the four-quark content of the $D^+_{s}$ and the $\omega$-$\phi$ mixing
model for this decay. We use 586 $\mathrm{pb}^{-1}$ of $e^{+}e^{-}$ collision
data collected at a center-of-mass energy of 4170 MeV. We find no evidence of a
signal, and set an upper limit on the branching fraction of
$\mathcal{B}(D^+_{s}\to\omega e^+\nu)<$0.20% at the 90% confidence level.
05/2011;
-
D. Cronin-Hennessy, J. Hietala,
S. Dobbs,
Z. Metreveli,
K. K. Seth,
A. Tomaradze,
T. Xiao,
L Martin,
A. Powell,
G Wilkinson, [......],
S. Mehrabyan,
M. Selen,
J. Wiss,
J Libby,
M. Kornicer,
R. E. Mitchell,
M. R. Shepherd,
C. M. Tarbert,
D. Besson,
T. K. Pedlar
[show abstract]
[hide abstract]
ABSTRACT: Using 586 $\textrm{pb}^{-1}$ of $e^{+}e^{-}$ collision data acquired at
$\sqrt{s}=4.170$ GeV with the CLEO-c detector at the Cornell Electron Storage
Ring, we report the first observation of $D_{s}^{*+} \to D_{s}^{+} e^{+} e^{-}$
with a significance of $5.3 \sigma$. The ratio of branching fractions
$\calB(D_{s}^{*+} \to D_{s}^{+} e^{+} e^{-}) / \calB(D_{s}^{*+} \to D_{s}^{+}
\gamma)$ is measured to be $[ 0.72^{+0.15}_{-0.13} (\textrm{stat}) \pm 0.10
(\textrm{syst})]%$, which is consistent with theoretical expectations.
04/2011;
-
CLEO Collaboration,
T. K. Pedlar,
D. Cronin-Hennessy, J. Hietala,
S. Dobbs,
Z. Metreveli,
K. K. Seth,
A. Tomaradze,
T. Xiao,
L Martin, [......],
N. Lowrey,
S. Mehrabyan,
M. Selen,
J. Wiss,
J Libby,
M. Kornicer,
R. E. Mitchell,
M. R. Shepherd,
C. M. Tarbert,
D. Besson
[show abstract]
[hide abstract]
ABSTRACT: Using 586pb^-1 of e^+e^- collision data at E_CM = 4170MeV, produced at the
CESR collider and collected with the CLEO-c detector, we observe the process
e^+e^- --> pi^+ pi^- h_c(1P). We measure its cross section to be
15.6+-2.3+-1.9+-3.0pb, where the third error is due to the external uncertainty
on the branching fraction of psi(2S) --> pi^0 h_c(1P), which we use for
normalization. We also find evidence for e^+e^- --> eta h_c(1P) at 4170MeV at
the 3sigma level, and see hints of a rise in the e^+e^- --> pi^+ pi^- h_c(1P)
cross section at 4260MeV.
04/2011;
-
D. Besson,
D. P. Hogan,
T. K. Pedlar,
D. Cronin-Hennessy, J. Hietala,
P. Zweber,
S. Dobbs,
Z. Metreveli,
K. K. Seth,
A. Tomaradze, [......],
J. Yelton,
P. Rubin,
N. Lowrey,
S. Mehrabyan,
M. Selen,
J. Wiss,
J. Libby,
M. Kornicer,
R. E. Mitchell,
C. M. Tarbert
[show abstract]
[hide abstract]
ABSTRACT: We report on a study of exclusive radiative decays of the Υ(1S) resonance into a final state consisting of a photon and two KS0 candidates. We find evidence for a signal for Υ(1S)→γf2′(1525); f2′(1525)→γKS0KS0, at a rate B(Υ(1S)→γf2′(1525))=(4.0±1.3±0.6)×10-5, consistent with previous observations of Υ(1S)→γf2′(1525); f2′(1525)→K+K-, and isospin. Combining this branching fraction with existing branching fraction measurements of Υ(1S)→γf2′(1525) and J/ψ→γf2′(1525), we obtain the ratio of branching fractions: B(Υ(1S)→γf2′(1525))/B(J/ψ→γf2′(1525))=0.09±0.02, approximately consistent with expectations based on soft-collinear effective theory.
Phys. Rev. D. 02/2011; 83(3).
-
The CLEO Collaboration,
D. Besson,
D. P. Hogan,
T. K. Pedlar,
D. Cronin-Hennessy, J. Hietala,
P. Zweber,
S. Dobbs,
Z. Metreveli,
K. K. Seth, [......],
J Yelton,
P Rubin,
N. Lowrey,
S. Mehrabyan,
M. Selen,
J. Wiss,
J Libby,
M. Kornicer,
R. E. Mitchell,
C. M. Tarbert
[show abstract]
[hide abstract]
ABSTRACT: We report on a study of exclusive radiative decays of the Upsilon(1S)
resonance into a final state consisting of a photon and two K0s candidates. We
find evidence for a signal for Upsilon(1S)->gamma f_2'(1525);
f_2'(1525)->K0sK0s, at a rate (4.0+/-1.3+/-0.6)x10^{-5}, consistent with
previous observations of Upsilon(1S)->gamma f_2'(1525); f_2'(1525)->K+K-, and
isospin. Combining this branching fraction with existing branching fraction
measurements of Upsilon(1S)->gamma f_2'(1525) and J/psi->gamma f_2'(1525), we
obtain the ratio of branching fractions: B(Upsilon(1S)->gamma
f_2'(1525))/B(J/psi->gamma f_2'(1525))=0.09+/-0.02, approximately consistent
with expectations based on soft collinear effective theory.
12/2010;
-
J. Libby,
M. Kornicer,
R. E. Mitchell,
M. R. Shepherd,
C. M. Tarbert,
D. Besson,
T. K. Pedlar,
J. Xavier,
D. Cronin-Hennessy, J. Hietala, [......],
A. Ryd,
A. J. Sadoff,
X. Shi,
W. M. Sun,
J. Yelton,
P. Rubin,
N. Lowrey,
S. Mehrabyan,
M. Selen,
J. Wiss
[show abstract]
[hide abstract]
ABSTRACT: We report the first determination of the relative strong-phase difference between D0→KS,L0K+K- and D̅ 0→KS,L0K+K-. In addition, we present updated measurements of the relative strong-phase difference between D0→KS,L0π+π- and D̅ 0→KS,L0π+π-. Both measurements exploit the quantum coherence between a pair of D0 and D̅ 0 mesons produced from ψ(3770) decays. The strong-phase differences measured are important for determining the Cabibbo-Kobayashi-Maskawa angle γ/ϕ3 in B-→K-D˜0 decays, where D˜0 is a D0 or D̅ 0 meson decaying to KS0h+h- (h=π, K), in a manner independent of the model assumed to describe the D0→KS0h+h- decay. Using our results, the uncertainty in γ/ϕ3 due to the error on the strong-phase difference is expected to be between 1.7° and 3.9° for an analysis using B-→K-D˜0, D˜0→KS0π+π- decays, and between 3.2° and 3.9° for an analysis based on B-→K-D˜0, D˜0→KS0K+K- decays. A measurement is also presented of the CP-odd fraction, F-, of the decay D0→KS0K+K- in the region of the ϕ→K+K- resonance. We find that in a region within 0.01 GeV2/c4 of the nominal ϕ mass squared F->0.91 at the 90% confidence level.
Phys. Rev. D. 12/2010; 82(11).
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The CLEO Collaboration,
M. Kornicer,
R. E. Mitchell,
C. M. Tarbert,
D. Besson,
T. K. Pedlar,
D. Cronin-Hennessy, J. Hietala,
P. Zweber,
S. Dobbs, [......],
A. J. Sadoff,
X Shi,
W. M. Sun,
J Yelton,
P Rubin,
N. Lowrey,
S. Mehrabyan,
M. Selen,
J. Wiss,
J Libby
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ABSTRACT: Using 9.32, 5.88 million Upsilon(2S,3S) decays taken with the CLEO-III
detector, we obtain five product branching fractions for the exclusive
processes Upsilon(2S) => gamma chi_{b0,1,2}(1P) => gamma gamma Upsilon(1S) and
Upsilon(3S) => gamma chi_{b1,2}(1P) => gamma gamma Upsilon(1S). We observe the
transition chi_{b0}(1P) => gamma Upsilon(1S) for the first time. Using the
known branching fractions for B[Upsilon(2S) => gamma chi_{bJ}(1P)], we extract
values for B[chi_{bJ}(1P) => gamma Upsilon(1S)] for J=0, 1, 2. In turn, these
values can be used to unfold the Upsilon(3S) product branching fractions to
obtain values for B[Upsilon(3S) => gamma chi_{b1,2}(1P) for the first time
individually. Comparison of these with each other and with the branching
fraction B[Upsilon(3S) => gamma chi_{b0}] previously measured by CLEO provides
tests of relativistic corrections to electric dipole matrix elements.
12/2010;
