1,731,123 research outputs found
The Role of Nitric Oxide in Lung Innate Immunity: Modulation of Surfactant Protein-A
No full textΣ�γχ�ονη ιατ�ική της εντατικής θε�απείας = Update of intensive care medicin
Properties of the "Entropy" H_λ(ξ) and the "Average Conditional Entropy" H_λ(ξ|η)
No full textapplication/pdfIn [2], [3] and [6], the information of a random variable ξ with respect to another random variable η is defined as [numerical formula] which is a generalization of Shannon's definition of information. This quantity plays a fundamental role in information theory. The quantity I(ξ, ξ), which is called "the entropy of ξ", is often used. But, when ξ is a continuous random variable, I(ξ, ξ) becomes infinite, and so, sometimes, it is inconvenient to use I(ξ, ξ) as "the entropy of ξ". In [7], the author introduced a new quantity L(P_1, P_2, μ) and, using this, defined the entropy H(P_ξ;λ)=H_λ(ξ) of P_ξ with respect to λ. This definition of H_λ(ξ) is more general than that of "entropy" in [3] and serves as both Shannon's entropy and Wiener's one. The aims of this paper are (i) to define the "average conditional entropy" H_λ(ξ|η) (Section 3), (ii) to investigate various properties of H_λ(ξ) and H_λ(ξ|η) (Sections 4 and 5) and (iii) to consider the relations among H_λ(ξ), H_λ(ξ|η), I(ξ, η), etc, and to derive analogous formulas to usual ones
Properties of the "Entropy" H_λ(ξ) and the "Average Conditional Entropy" H_λ(ξ|η)
No full textapplication/pdfIn [2], [3] and [6], the information of a random variable ξ with respect to another random variable η is defined as [numerical formula] which is a generalization of Shannon's definition of information. This quantity plays a fundamental role in information theory. The quantity I(ξ, ξ), which is called "the entropy of ξ", is often used. But, when ξ is a continuous random variable, I(ξ, ξ) becomes infinite, and so, sometimes, it is inconvenient to use I(ξ, ξ) as "the entropy of ξ". In [7], the author introduced a new quantity L(P_1, P_2, μ) and, using this, defined the entropy H(P_ξ;λ)=H_λ(ξ) of P_ξ with respect to λ. This definition of H_λ(ξ) is more general than that of "entropy" in [3] and serves as both Shannon's entropy and Wiener's one. The aims of this paper are (i) to define the "average conditional entropy" H_λ(ξ|η) (Section 3), (ii) to investigate various properties of H_λ(ξ) and H_λ(ξ|η) (Sections 4 and 5) and (iii) to consider the relations among H_λ(ξ), H_λ(ξ|η), I(ξ, η), etc, and to derive analogous formulas to usual ones
Search for the radiative Ξ−b → Ξ−γ decay
No full textThe first search for the rare radiative decay Ξ−b → Ξ−γ is performed using data collected by the LHCb experiment in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1. The Ξ−b → Ξ−J/ψ channel is used as normalization. No Ξ−b → Ξ−γ signal is found and an upper limit of B(Ξ−b → Ξ−γ) < 1.3 × 10−4 at 95% confidence level is obtained
Search for the radiative Ξ−b → Ξ−γ decay
No full textThe first search for the rare radiative decay Ξ−b → Ξ−γ is performed using data collected by the LHCb experiment in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1. The Ξ−b → Ξ−J/ψ channel is used as normalization. No Ξ−b → Ξ−γ signal is found and an upper limit of B(Ξ−b → Ξ−γ) < 1.3 × 10−4 at 95% confidence level is obtained
Search for the radiative Ξ−b → Ξ−γ decay
No full textAbstract
The first search for the rare radiative decay
Ξ
b
−
→ Ξ−γ is performed using data collected by the LHCb experiment in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1. The
Ξ
b
−
→ Ξ−J/ψ channel is used as normalization. No
Ξ
b
−
→ Ξ−γ signal is found and an upper limit of
B
(
Ξ
b
−
→ Ξ−γ) < 1.3 × 10−4 at 95% confidence level is obtained
ξύν, σύν (Moer. ξ 2, Moer. ξ 3, Moer. ξ 4)
No full textThis article provides a philological and linguistic commentary on the prefixes ξύν and σύν discussed in the Atticist lexicon Moer. ξ 2, Moer. ξ 3, Moer. ξ 4
Observation of Ξ- Hyperon transverse polarization in ψ (3686) → Ξ-Ξ¯
No full textUsing a sample of (448.1±2.9)×106 ψ(3686) decays collected with the BESIII detector at BEPCII, we report an observation of Ξ- transverse polarization with a significance of 7.3σ in the decay ψ(3686)→Ξ-Ξ¯+ (Ξ-→Λπ-, Ξ¯+→Λ¯π+, Λ→pπ-, Λ¯→p¯π+). The relative phase of the electric and magnetic form factors is determined to be Δφ=(0.667±0.111±0.058) rad. This is the first measurement of the relative phase for a ψ(3686) decay into a pair of Ξ-Ξ¯+ hyperons. The Ξ- decay parameters (αΞ-, φΞ-) and their conjugates (αΞ¯+, φΞ¯+), the angular-distribution parameter αψ, and the strong-phase difference δp-δs for Λπ- scattering are measured to be consistent with previous BESIII results
Measurements of the Branching Fractions of the Semileptonic Decays Ξ → Ξℓν and the Asymmetry Parameter of Ξ → Ξπ
No full textUsing data samples of 89.5 and 711fb recorded at energies of
=10.52 and 10.58 GeV, respectively, with the Belle detector at the KEKB ee collider, we report measurements of branching fractions of semileptonic decays Ξ → Ξℓν(ℓ=e or μ) and the CP-asymmetry parameter of Ξ → Ξπ decay. The branching fractions are measured to be B(Ξ → Ξeν)=
1.31±0.04±0.07±0.38)% and B(Ξ → Ξμν = (1.27±0.06±0.10±0.37)% , and the decay parameter α is measured to be 0.63±0.03±0.01 with much improved precision compared with the current world average. The corresponding ratio B(Ξ → Ξeν) /B(Ξ → Ξμν) is 1.03±0.05±0.07, which is consistent with the expectation of lepton flavor universality. The first measured asymmetry parameter A=(α+α)/(α+α) = 0.024±0.052±0.014 is found to be consistent with zero. The first and the second uncertainties above are statistical and systematic, respectively, while the third ones arise due to the uncertainty of the Ξ → Ξπ branching fraction
Measurement of the Cross Section for e+e−→Ξ−¯Ξ+ and Observation of an Excited Ξ Baryon
No full textUsing a total of 11.0 fb−1 of e+e− collision data with center-of-mass energies between 4.009 and 4.6 GeV and collected with the BESIII detector at BEPCII, we measure fifteen exclusive cross sections and effective form factors for the process e+e−→Ξ−¯Ξ+ by means of a single baryon-tag method. After performing a fit to the dressed cross section of e+e−→Ξ−¯Ξ+, no significant ψ(4230) or ψ(4260) resonance is observed in the Ξ−¯Ξ+ final states, and upper limits at the 90% confidence level on ΓeeB for the processes ψ(4230)/ψ(4260)→Ξ−¯Ξ+ are determined. In addition, an excited Ξ baryon at 1820 MeV/c2 is observed with a statistical significance of 6.2–6.5σ by including the systematic uncertainty, and the mass and width are measured to be M=(1825.5±4.7±4.7) MeV/c2 and Γ=(17.0±15.0±7.9) MeV, which confirms the existence of the JP=32− state Ξ(1820)
- …
