-
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;
-
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).
-
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
[show abstract]
[hide abstract]
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;
-
P. Rubin,
N. Lowrey,
S. Mehrabyan,
M. Selen, J. Wiss,
J. Libby,
M. Kornicer,
R. E. Mitchell,
M. R. Shepherd,
C. M. Tarbert, [......],
D. L. Kreinick,
V. E. Kuznetsov,
J. R. Patterson,
D. Peterson,
D. Riley,
A. Ryd,
A. J. Sadoff,
X. Shi,
W. M. Sun,
J. Yelton
[show abstract]
[hide abstract]
ABSTRACT: We have searched for flavor-changing neutral current decays and lepton-number-violating decays of D+ and Ds+ mesons to final states of the form h±e∓e+, where h is either π or K. We use the complete samples of CLEO-c open-charm data, corresponding to integrated luminosities of 818 pb-1 at the center-of-mass energy ECM=3.774 GeV containing 2.4×106 D+D- pairs and 602 pb-1 at ECM=4.170 GeV containing 0.6×106 Ds*±Ds∓ pairs. No signal is observed in any channel, and we obtain 90% confidence level upper limits on branching fractions B(D+→π+e+e-)<5.9×10-6, B(D+→π-e+e+)<1.1×10-6, B(D+→K+e+e-)<3.0×10-6, B(D+→K-e+e+)<3.5×10-6, B(Ds+→π+e+e-)<2.2×10-5, B(Ds+→π-e+e+)<1.8×10-5, B(Ds+→K+e+e-)<5.2×10-5, and B(Ds+→K-e+e+)<1.7×10-5.
Phys. Rev. D. 11/2010; 82(9).
