We report measurements of B→χ(c1)γK and χ(c2)γK decays using 772×10(6) BBover ¯ events collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. ...Evidence of a new resonance in the χ(c1)γ final state is found with a statistical significance of 3.8σ. This state has a mass of 3823.1±1.8(stat)±0.7(syst) MeV/c(2), a value that is consistent with theoretical expectations for the previously unseen 1(3)D(2) ccover ¯ meson. We find no other narrow resonance and set upper limits on the branching fractions of the X(3872)→χ(c1)γ and χ(c2)γ decays.
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We report the first observation of the decay Λ_{c}^{+}→pK^{+}π^{-} using a 980 fb^{-1} data sample collected by the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. This is the ...first observation of a doubly Cabibbo-suppressed decay of a charmed baryon. We measure the branching ratio of this decay with respect to its Cabibbo-favored counterpart to be B(Λ_{c}^{+}→pK^{+}π^{-})/B(Λ_{c}^{+}→pK^{-}π^{+})=(2.35±0.27±0.21)×10^{-3}, where the uncertainties are statistical and systematic, respectively.
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Summary
We tested our hypothesis that use of the Parker Flex‐Tip™ tracheal tube could reduce the incidence of nasal mucosal trauma during nasotracheal intubation when compared with a conventional tip ...tracheal tube. One hundred and two patients, who were scheduled for elective oral surgery in which nasotracheal intubation was indicated to optimise the surgical approach, were recruited into this study. Either a Flex‐Tip tracheal tube or a conventional tip tracheal tube was chosen randomly for each nasotracheal intubation. The incidence of epistaxis using the Flex‐Tip tracheal tube (6 (11.8%)) was significantly lower than that with the conventional tip tracheal tube (18 (35.3%); p = 0.009). Nasal pain due to intubation, rated on a 100‐mm visual analogue scale, was less intense with the Flex‐Tip tracheal tube (median, (10th–90th percentile) 19 (12–28) mm compared with the conventional tip tracheal tube (30 (22–35) mm; p < 0.001). The Flex‐Tip tracheal tube thus appeared to reduce the incidence of nasal mucosal trauma during nasotracheal intubation and the incidence of post‐intubation nasal pain, compared with the conventional tip tracheal tube.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
A
bstract
We measure the branching fractions and
CP
asymmetries for the singly Cabibbo-suppressed decays
D
0
→
π
+
π
−
η
,
D
0
→
K
+
K
−
η
, and
D
0
→
ϕη
, using 980 fb
−
1
of data from the Belle ...experiment at the KEKB
e
+
e
−
collider. We obtain
B
D
0
→
π
+
π
−
η
=
1.22
±
0.02
stat
±
0.02
syst
±
0.03
B
ref
×
10
−
3
,
B
D
0
→
K
+
K
−
η
=
1.80
−
0.06
+
0.07
stat
±
0.04
syst
±
0.05
B
ref
×
10
−
4
,
B
D
0
→
ϕη
=
1.84
±
0.09
stat
±
0.06
syst
±
0.05
B
ref
×
10
−
4
,
where the third uncertainty (
B
ref
) is from the uncertainty in the branching fraction of the reference mode
D
0
→
K
−
π
+
η
. The color-suppressed decay
D
0
→
ϕη
is observed for the first time, with very high significance. The results for the
CP
asymmetries are
A
CP
D
0
π
+
π
−
η
=
0.9
±
1.2
stat
±
0.5
syst
%
,
A
CP
D
0
→
K
+
K
−
η
=
−
1.4
±
3.3
stat
±
1.1
syst
%
,
ACP
D
0
→
ϕη
=
−
1.9
±
4.4
stat
±
0.6
syst
%
.
The results for
D
0
→
π
+
π
−
η
are a significant improvement over previous results. The branching fraction and
A
CP
results for
D
0
→
K
+
K
−
η
, and the
ACP
result for
D
0
→
ϕη
, are the first such measurements. No evidence for
CP
violation is found in any of these decays.
Primary and atmospheric cosmic-ray spectra were precisely measured with the BESS-TeV spectrometer. The spectrometer was upgraded from BESS-98 to achieve seven times higher resolution in momentum ...measurement. We report absolute fluxes of primary protons and helium nuclei in the energy ranges, 1–540 GeV and 1–250 GeV/n, respectively, and absolute flux of atmospheric muons in the momentum range 0.6–400 GeV/c.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
We report the first evidence for the η(b)(2S) using the h(b)(2P)→η(b)(2S)γ transition and the first observation of the h(b)(1P)→η(b)(1S)γ and h(b)(2P)→η(b)(1S)γ transitions. The mass and width of the ...η(b)(1S) and η(b)(2S) are measured to be m(η(b)(1S))=(9402.4±1.5±1.8) MeV/c(2), m(η(b)(2S))=(9999.0±3.5(-1.9)(+2.8)) MeV/c(2), and Γ(η(b)(1S))=(10.8(-3.7-2.0)(+4.0+4.5)) MeV. We also update the h(b)(1P) and h(b)(2P) mass measurements. We use a 133.4 fb(-1) data sample collected at energies near the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider.
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A
bstract
We present a search for the dark photon
A
′ in the
B
0
→
A
′
A
′ decays, where
A
′ subsequently decays to
e
+
e
−
,
μ
+
μ
−
, and
π
+
π
−
. The search is performed by analyzing 772 × 10
6
B
...B
¯
events collected by the Belle detector at the KEKB
e
+
e
−
energy-asymmetric collider at the ϒ(4
S
) resonance. No signal is found in the dark photon mass range 0
.
01 GeV
/c
2
≤
m
A
′
≤ 2
.
62 GeV
/c
2
, and we set upper limits of the branching fraction of
B
0
→
A
′
A
′ at the 90% confidence level. The products of branching fractions,
ℬ
B
0
→
A
′
A
′
×
ℬ
A
′
→
e
+
e
−
2
and
ℬ
B
0
→
A
′
A
′
×
ℬ
A
′
→
μ
+
μ
−
2
, have limits of the order of 10
−
8
depending on the
A
′ mass. Furthermore, considering
A
′ decay rate to each pair of charged particles, the upper limits of
ℬ
B
0
→
A
′
A
′
are of the order of 10
−
8
–10
−
5
. From the upper limits of
ℬ
B
0
→
A
′
A
′
, we obtain the Higgs portal coupling for each assumed dark photon and dark Higgs mass. The Higgs portal couplings are of the order of 10
−
2
–10
−
1
at
m
h
′
≃
m
B
0
± 40 MeV
/c
2
and 10
−
1
–1 at
m
h
′
≃
m
B
0
± 3 GeV
/c
2
.
A
bstract
The first dedicated search for the
η
c
2
(1
D
) is carried out using the decays
B
+
→ η
c
2
(1
D
)
K
+
,
B
0
→
η
c
2
(1
D
)
K
S
0
,
B
0
→ η
c
2
(1
D
)
π
−
K
+
, and
B
+
→ η
c
2
(1
D
)
π
+
K
...S
0
with
η
c
2
(1
D
)
→ h
c
γ
. No significant signal is found. For the
η
c
2
(1
D
) mass range between 3795 and 3845 MeV
/c
2
, the branching-fraction upper limits are determined to be ℬ(
B
+
→ η
c
2
(1
D
)
K
+
)
×
ℬ(
η
c
2
(1
D
)
→ h
c
γ
)
<
3
.
7
×
10
−
5
, ℬ(
B
0
→ η
c
2
(1
D
)
K
0
)
×
ℬ(
η
c
2
(1
D
)
→ h
c
γ
)
<
3
.
5
×
10
−
5
, ℬ(
B
0
→ η
c
2
(1
D
)
π
−
K
+
)
×
ℬ(
η
c
2
(1
D
)
→ h
c
γ
)
<
1
.
0
×
10
−
4
, and ℬ(
B
+
→ η
c
2
(1
D
)
π
+
K
S
0
)
×
ℬ(
η
c
2
(1
D
)
→ h
c
γ
)
<
1
.
1
×
10
−
4
at 90% C.L. The analysis is based on the 711 fb
−
1
data sample collected on the ϒ(4
S
) resonance by the Belle detector, which operated at the KEKB asymmetric-energy
e
+
e
−
collider.
We report the first observation of the radiative decay of the ϒ(1S) into a charmonium state. The significance of the observed signal of ϒ(1S)→γχ_{c1} is 6.3 standard deviations including systematics. ...The branching fraction is calculated to be Bϒ(1S)→γχ_{c1}=4.7_{-1.8}^{+2.4}(stat)_{-0.5}^{+0.4}(sys)×10^{-5}. We also searched for ϒ(1S) radiative decays into χ_{c0,2} and η_{c}(1S,2S), and set upper limits on their branching fractions. These results are obtained from a 24.9 fb^{-1} data sample collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider at a center-of-mass energy equal to the ϒ(2S) mass using ϒ(1S) tagging by the ϒ(2S)→ϒ(1S)π^{+}π^{-} transitions.
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Using a sample of 771.6×10(6) ϒϒ(4S) decays collected by the Belle experiment at the KEKB e(+)e(-) collider, we observe, for the first time, the transition ϒ(4S)→ηh(b)(1P) with the branching fraction ...Bϒ(4S)→ηh(b)(1P)=(2.18±0.11±0.18)×10(-3) and we measure the h(b)(1P) mass M(h(b)(1P))=(9899.3±0.4±1.0) MeV/c(2), corresponding to the hyperfine (HF) splitting ΔM(HF)(1P)=(0.6±0.4±1.0) MeV/c(2). Using the transition h(b)(1P)→γη(b)(1S), we measure the η(b)(1S) mass M(η(b)(1S))=(9400.7±1.7±1.6) MeV/c(2), corresponding to ΔM(HF)(1S)=(59.6±1.7±1.6) MeV/c(2), the η(b)(1S) width Γ(η(b)(1S))=(8(-5)(+6)±5) MeV/c(2) and the branching fraction Bh(b)(1P)→γη(b)(1S)=(56±8±4)%.
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