A
bstract
We measure the branching fractions for seven
$$ {D}_s^{+} $$
D
s
+
two-body decays to pseudo-scalar mesons, by analyzing data collected at
$$ \sqrt{s} $$
s
= 4
.
178 ∼ 4
.
226 GeV with the ...BESIII detector at the BEPCII collider. The branching fractions are determined to be
$$ {\displaystyle \begin{array}{c}\mathcal{B}\left({D}_s^{+}\to {K}^{+}\eta \hbox{'}\right)=\left(2.68\pm 0.17\pm 0.17\pm 0.08\right)\times {10}^{-3},\\ {}\mathcal{B}\left({D}_s^{+}\to \eta \hbox{'}{\pi}^{+}\right)=\left(37.8\pm 0.4\pm 2.1\pm 1.2\right)\times {10}^{-3},\\ {}\mathcal{B}\left({D}_s^{+}\to {K}^{+}\eta \right)=\left(1.62\pm 0.10\pm 0.03\pm 0.05\right)\times {10}^{-3},\\ {}\mathcal{B}\left({D}_s^{+}\to \eta {\pi}^{+}\right)=\left(17.41\pm 0.18\pm 0.27\pm 0.54\right)\times {10}^{-3},\\ {}\mathcal{B}\left({D}_s^{+}\to {K}^{+}{K}_S^0\right)=\left(15.02\pm 0.10\pm 0.27\pm 0.47\right)\times {10}^{-3},\\ {}\mathcal{B}\left({D}_s^{+}\to {K}_S^0{\pi}^{+}\right)=\left(1.109\pm 0.034\pm 0.023\pm 0.035\right)\times {10}^{-3},\\ {}\mathcal{B}\left({D}_s^{+}\to {K}^{+}{\pi}^0\right)=\left(0.748\pm 0.049\pm 0.018\pm 0.035\right)\times {10}^{-3},\end{array}} $$
B
D
s
+
→
K
+
η
'
=
2.68
±
0.17
±
0.17
±
0.08
×
10
−
3
,
B
D
s
+
→
η
'
π
+
=
37.8
±
0.4
±
2.1
±
1.2
×
10
−
3
,
B
D
s
+
→
K
+
η
=
1.62
±
0.10
±
0.03
±
0.05
×
10
−
3
,
B
D
s
+
→
η
π
+
=
17.41
±
0.18
±
0.27
±
0.54
×
10
−
3
,
B
D
s
+
→
K
+
K
S
0
=
15.02
±
0.10
±
0.27
±
0.47
×
10
−
3
,
B
D
s
+
→
K
S
0
π
+
=
1.109
±
0.034
±
0.023
±
0.035
×
10
−
3
,
B
D
s
+
→
K
+
π
0
=
0.748
±
0.049
±
0.018
±
0.035
×
10
−
3
,
where the first uncertainties are statistical, the second are systematic, and the third are from external input branching fraction of the normalization mode
$$ {D}_s^{+} $$
D
s
+
→
K
+
K
−
π
+
. Precision of our measurements is significantly improved compared with that of the current world average values.
The Tibet-III air shower array, consisting of 533 scintillation detectors, has been operating successfully at Yangbajing in Tibet, China since 1999. Using the data set collected by this array from ...1999 November through 2005 November, we obtained the energy spectrum of gamma -rays from the Crab Nebula, expressed by a power law as (dJ/dE) = (2.09 ± 0.32) X 10-12(E/3 TeV)-2.96±0.14 cm-2 s-1 TeV-1 in the energy range of 1.7-40 TeV. This result is consistent with other independent gamma -ray observations by imaging air Cherenkov telescopes. In this paper, we carefully checked and tuned the performance of the Tibet-III array using data on the Moon's shadow in comparison with a detailed Monte Carlo (MC) simulation. The shadow is shifted to the west of the Moon's apparent position as an effect of the geomagnetic field, although the extent of this displacement depends on the primary energy of positively charged cosmic rays. This finding enables us to estimate the systematic error in determining the primary energy from its shower size. This error is estimated to be less than ±12% in our experiment. This energy scale estimation is the first attempt among cosmic ray experiments at ground level. The systematic pointing error is also estimated to be smaller than 0011. The deficit rate and the position of the Moon's shadow are shown to be very stable within a statistical error of ±6% year by year. This guarantees the long-term stability of pointlike source observation with the Tibet-III array. These systematic errors are adequately taken into account in our study of the Crab Nebula.
Superconducting Dome in a Gate-Tuned Band Insulator Ye, J. T.; Zhang, Y. J.; Akashi, R. ...
Science (American Association for the Advancement of Science),
11/2012, Letnik:
338, Številka:
6111
Journal Article
Recenzirano
A dome-shaped superconducting region appears in the phase diagrams of many unconventional superconductors. In doped band insulators, however, reaching optimal superconductivity by the fine-tuning of ...carriers has seldom been seen. We report the observation of a superconducting dome in the temperature—carrier density phase diagram of MoS₂, an archetypal band insulator. By quasi-continuous electrostatic carrier doping achieved through a combination of liquid and solid gating, we revealed a large enhancement in the transition temperature T c occurring at optimal doping in the chemically inaccessible low-carrier density regime. This observation indicates that the superconducting dome may anse even in doped band insulators.
Anisotropy and Corotation of Galactic Cosmic Rays Amenomori, M; Ayabe, S; Bi, X.J ...
Science (American Association for the Advancement of Science),
10/2006, Letnik:
314, Številka:
5798
Journal Article
Recenzirano
Odprti dostop
The intensity of Galactic cosmic rays is nearly isotropic because of the influence of magnetic fields in the Milky Way. Here, we present two-dimensional high-precision anisotropy measurement for ...energies from a few to several hundred teraelectronvolts (TeV), using the large data sample of the Tibet Air Shower Arrays. Besides revealing finer details of the known anisotropies, a new component of Galactic cosmic ray anisotropy in sidereal time is uncovered around the Cygnus region direction. For cosmic-ray energies up to a few hundred TeV, all components of anisotropies fade away, showing a corotation of Galactic cosmic rays with the local Galactic magnetic environment. These results have broad implications for a comprehensive understanding of cosmic rays, supernovae, magnetic fields, and heliospheric and Galactic dynamic environments.
Since the winter season of 2013, a number of persistent haze–fog events have occurred in central-eastern China. Continuous measurements of the chemical and physical properties of PM1 at a regional ...background station in the Yangtze River Delta area of China from 16 Nov. to 18 Dec., 2013 revealed several haze–fog events, among which a heavy haze–fog event occurred between 6 Dec. and 8 Dec. The mean concentration of PM1 was 212μgm−3 in the heavy haze–fog period, which was about 10 times higher than on clean days and featured a peak mass concentration that reached 298μgm−3. Organics were the largest contributor to the dramatic rise of PM1 on heavy haze–fog days (average mass concentration of 86μgm−3), followed by nitrate (58μgm−3), sulfate (35μgm−3), ammonium (29μgm−3), and chloride (4.0μgm−3). Nitrate exhibited the largest increase (~20 factors), associated with a significant increase in NOx. This was mainly attributable to increased coal combustion emissions, relative to motor vehicle emissions, and was caused by short-distance pollutant transport within surrounding areas. Low-volatility oxidized organic aerosols (OA) (LV-OOA) and biomass-burning OA (BBOA) also increased sharply on heavy haze–fog days, exhibiting an enhanced oxidation capacity of the atmosphere and increased emissions from biomass burning. The strengthening of the oxidation capacity during the heavy pollution episode, along with lower solar radiation, was probably due to increased biomass burning, which were important precursors of O3. The prevailing meteorological conditions, including low wind and high relative humidity, and short distance transported gaseous and particulate matter surrounding of the sampling site, coincided with the increased pollutant concentrations mainly from biomass-burning mentioned above to cause the persistent haze–fog event in the YRD area.
•Formation mechanism of a heavy haze-fog event that occurred in the YRD region of china was discussed.•Nitrate exhibited the largest increase on the heavy haze-fog days.•Increased biomass burning and atmospheric oxidizing capacity were the major reasons for the significant increase of OA.•Short-distance transport, low wind speed and high RH were highly responsible for the formation of the pollution event.
The LIM protein AJUBA is a scaffold protein participating in the regulation of cell adhesion, mitosis, DNA damage, cell differentiation, proliferation, migration and gene transcription. However, its ...roles in tumorigenesis and progression are poorly defined. Here, we report that AJUBA is highly expressed in colorectal cancer (CRC) and promotes CRC cell growth in culture and in xenografted mice via an inhibition of apoptosis. AJUBA represses the expression of IFIT2 gene, an interferon-stimulated gene and a known apoptosis inducer and tumour suppressor to mediate its resistance to apoptosis. Mechanistic investigations reveal that AJUBA specifically binds the FERM domain of JAK1 to dissociate JAK1 from the IFNγ recepter, resulting in an inhibition of STAT1 phosporylation and concomitantly its nuclear translocation. Clinically, the level of AJUBA in CRC specimens is negatively correlated with the levels of IFIT2 and pSTAT1. Collectively, these studies demonstrate that AJUBA can promote CRC growth via inhibiting apoptosis and serve as a target for the therapeutics and a marker for diagnosis of CRC.
A series of new organic semiconductors for organic thin‐film transistors (OTFTs) using dithieno3,2‐b:2′,3′‐dthiophene as the core are synthesized. Their electronic and optical properties are ...investigated using scanning electron microscopy (SEM), X‐ray diffraction (XRD), UV‐vis and photoluminescence spectroscopies, thermal gravimetric analysis (TGA), and differential scanning calorimetry (DSC). The compounds exhibit an excellent field‐effect performance with a high mobility of 0.42 cm2 V–1 s–1 and an on/off ratio of 5 × 106. XRD patterns reveal these films, grown by vacuum deposition, to be highly crystalline, and SEM reveals well‐interconnected, microcrystalline domains in these films at room temperature. TGA and DSC demonstrate that the phenyl‐substituted compounds possess excellent thermal stability. Furthermore, weekly shelf‐life tests (under ambient conditions) of the OTFTs based on the phenyl‐substituted compounds show that the mobility for the bis(diphenyl)‐substituted thiophene was almost unchanged for more than two months, indicating a high environmental stability.
A series of new organic semiconductors for organic thin‐film transistors using dithieno3,2‐b:2′,3′‐dthiophene as the core are synthesized (see Figure). The compounds exhibit excellent field‐effect performances, with a high mobility of 0.42 cm2 V–1 s–1 and an on/off ratio of 5 × 106. Devices based on phenyl‐substituted compounds (e.g., 2) have excellent thermal stability and high environmental stability.
Both inflammatory processes and glutamatergic systems have been implicated in the pathophysiology of mood-related disorders. However, the role of caspase-1, a classic inflammatory caspase, in ...behavioral responses to chronic stress remains largely unknown. To address this issue, we examined the effects and underlying mechanisms of caspase-1 on preclinical murine models of depression. We found that loss of caspase-1 expression in Caspase-1
knockout mice alleviated chronic stress-induced depression-like behaviors, whereas overexpression of caspase-1 in the hippocampus of wild-type (WT) mice was sufficient to induce depression- and anxiety-like behaviors. Furthermore, chronic stress reduced glutamatergic neurotransmission and decreased surface expression of glutamate receptors in hippocampal pyramidal neurons of WT mice, but not Caspase-1
mice. Importantly, pharmacological inhibition of caspase-1-interleukin-1β (IL-1β) signaling pathway prevented the depression-like behaviors and the decrease in surface expression of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors (AMPARs) in stressed WT mice. Finally, the effects of chronic stress on both depression- and anxiety-like behaviors can be mimicked by exogenous intracerebroventricular (i.c.v.) administration of IL-1β in both WT and Caspase-1
mice. Taken together, our findings demonstrate that an increase in the caspase-1/IL-1β axis facilitates AMPAR internalization in the hippocampus, which dysregulates glutamatergic synaptic transmission, eventually resulting in depression-like behaviors. These results may represent an endophenotype for chronic stress-induced depression.
ABSTRACT This paper reports on the measurement of the large-scale anisotropy in the distribution of cosmic-ray arrival directions using the data collected by the air shower detector ARGO-YBJ from ...2008 January to 2009 December, during the minimum of solar activity between cycles 23 and 24. In this period, more than 2 × 1011 showers were recorded with energies between ∼1 and 30 TeV. The observed two-dimensional distribution of cosmic rays is characterized by two wide regions of excess and deficit, respectively, both of relative intensity ∼10−3 with respect to a uniform flux, superimposed on smaller size structures. The harmonic analysis shows that the large-scale cosmic-ray relative intensity as a function of R.A. can be described by the first and second terms of a Fouries series. The high event statistics allow the study of the energy dependence of the anistropy, showing that the amplitude increases with energy, with a maximum intensity at ∼10 TeV, and then decreases while the phase slowly shifts toward lower values of R.A. with increasing energy. The ARGO-YBJ data provide accurate observations over more than a decade of energy around this feature of the anisotropy spectrum.
PDF
