Selective inhibition of the iNOS by acetamidine derivatives

n/

Nimuendajú às voltas com a história

Em 2000 foi editado em Portugal o livro "Cartas do Sertão de Curt Nimuendajú para Carlos Estevão de Oliveira". Textos do etnólogo inéditos em português continuam, por sua vez, despontando em revistas especializadas, atestando o interesse dessas etnografias realizadas na primeira metade do século XX, a partir de trabalho de campo pioneiro.Este artigo considera que as cartas -- padrão de relato diverso daquele que caracteriza as monografias etnográficas descritivas, gênero no qual Nimuendajú se consagrou -- acrescentam novo aspecto a sua obraIn 2000, a book entitled "Cartas do Sertão de Curt Nimuendajú para Carlos Estevão de Oliveira" ("Letters from the Backlands by Curt Nimuendajú to Carlos Estevão de Oliveira") was published in Portugal. The appearance of Nimuendajú's previously unpublished writings in Portuguese attests to the interest which continues to be shown in regard to this early twentieth century ethnographer and his pioneer fieldwork. By focusing on the ethnographer's letters, a literary genre which is distinct from the descriptive ethnographies for which he is better known, this article examines a new dimension of Nimuendajú's work

Search for a CP-odd light Higgs boson in J/ψ →γA⁰

Using J/ψ radiative decays from 9.0 billion J/ψ events collected by the BESIII detector, we search for di-muon decays of a CP-odd light Higgs boson (A0), predicted by many new physics models beyond the Standard Model, including the next-to-minimal supersymmetric Standard Model. No evidence for the CP-odd light Higgs production is found, and we set 90% confidence level upper limits on the product branching fraction B(J/ψ→γA0)×B(A0→μ+μ-) in the range of (1.2-778.0)×10-9 for 0.212≤mA0≤3.0 GeV/c2. The new measurement is a 6-7 times improvement over our previous measurement, and is also slightly better than the BABAR measurement in the low-mass region for tanβ=1

Partial wave analysis of ψ(3686) → K⁺K⁻η

Using a sample of (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector, we perform the first partial wave analysis of ψ(3686)→K+K-η. In addition to the well established states, φ(1020), φ(1680), and K3∗(1780), contributions from X(1750), ρ(2150), ρ3(2250), and K2∗(1980) are also observed. The X(1750) state is determined to be a 1-resonance. The simultaneous observation of the φ(1680) and X(1750) indicates that the X(1750), with previous observations in photoproduction, is distinct from the φ(1680). The masses, widths, branching fractions of ψ(3686)→K+K-η, and the intermediate resonances are also measured

Observation of ψ(3686) → Ξ(1530)⁰Ξ¯(1530)⁰ and Ξ(1530)⁰Ξ¯⁰

Using (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector and a single-baryon tagging technique, we present the first observation of the decays ψ(3686)→Ξ(1530)0Ξ¯(1530)0 and Ξ(1530)0Ξ¯0. The branching fractions are measured to be B(ψ(3686)→Ξ(1530)0Ξ¯(1530)0)=(6.77±0.14±0.39)×10-5 and B(ψ(3686)→Ξ(1530)0Ξ¯0)=(0.53±0.04±0.03)×10-5. Here, the first and second uncertainties are statistical and systematic, respectively. In addition, the parameter associated with the angular distribution for the decay ψ(3686)→Ξ(1530)0Ξ¯(1530)0 is determined to be α=0.32±0.19±0.07, in agreement with theoretical predictions within one standard deviation

Study of the decay D⁺ → K^∗(892)⁺K⁰_S in D⁺ → K⁺K⁰_Sπ⁰

Based on an e+e− collision data sample corresponding to an integrated luminosity of 2.93  fb−1 collected with the BESIII detector at √s=3.773  GeV, the first amplitude analysis of the singly Cabibbo-suppressed decay D+→K+K0Sπ0 is performed. From the amplitude analysis, the K∗(892)+K0S component is found to be dominant with a fraction of (57.1±2.6±4.2)%, where the first uncertainty is statistical and the second systematic. In combination with the absolute branching fraction B(D+→K+K0Sπ0) measured by BESIII, we obtain B(D+→K∗(892)+K0S)=(8.69±0.40±0.64±0.51)×10−3, where the third uncertainty is due to the branching fraction B(D+→K+K0Sπ0). The precision of this result is significantly improved compared to the previous measurement. This result also differs from most of theoretical predictions by about 4σ, which may help to improve the understanding of the dynamics behind

Measurements of Born cross sections of e⁺e⁻ → D*_s⁺D⁻_sJ + c.c.

The Born cross sections are measured for the first time for the processes e+e−→D*+sD∗s0(2317)−+c.c. and e+e−→D*+sDs1(2460)−+c.c. at the center-of-mass energy √s=4.600  GeV, 4.612 GeV, 4.626 GeV, 4.640 GeV, 4.660 GeV, 4.68 GeV, and 4.700 GeV, and for e+e−→D*+sDs1(2536)−+c.c. at √s=4.660  GeV, 4.680 GeV, and 4.700 GeV, using data samples collected with the BESIII detector at the BEPCII collider. No structures are observed in cross-section distributions for any of the processes

Observation of the <i>Y</i>(4220) and <i>Y</i>(4390) in the process <i>e⁺e⁻ → ηJ/ψ</i>

The cross sections of the process e+e−→ηJ/ψ at center-of-mass energies (√s) between 3.81 and 4.60 GeV are measured with high precision by using data samples collected with the BESIII detector operating at the BEPCII storage ring. Three structures are observed by analyzing the line shape of the measured cross sections, and a maximum-likelihood fit including three resonances is performed by assuming the lowest lying structure is the ψ(4040). For the other resonances, we obtain masses of (4218.6±3.8±2.5) and (4382.0±13.3±1.7)  MeV/c2 with corresponding widths of (82.0±5.7±0.4) and (135.8±60.8±22.5)  MeV, respectively, where the first uncertainties are statistical and the second ones systematic. The measured resonant parameters are consistent with those of the Y(4220) and Y(4390) from previous measurements of different final states. For the first time, we observe the decays of the Y(4220) and Y(4390) into ηJ/ψ final states

Cross section measurement of e⁺e⁻ → π⁺π⁻ψ(3686) from √s = 4.0076 GeV to 4.6984 GeV

Using data samples with a total integrated luminosity of 20.1  fb−1 collected by the BESIII detector operating at the BEPCII collider, the cross section of the process e+e−→π+π−ψ(3686) is measured at center-of-mass energies between 4.0076 and 4.6984 GeV. The measured cross section is consistent with previous results, and with much improved precision. A fit to the measured energy-dependent cross section, which includes three Breit-Wigner functions and a nonresonant contribution, confirms the existence of the charmonium-like states Y(4220), Y(4390), and Y(4660). This is the first observation of the Y(4660) at the BESIII experiment

Study of the decay D⁺_s → π⁺π⁺π⁻η and observation of the W-annihilation decay D⁺_s→ a₀(980)⁺ρ⁰

The decay D+s→π+π+π−η is observed for the first time, using e+e− collision data corresponding to an integrated luminosity of 6.32  fb−1, collected by the BESIII detector at center-of-mass energies between 4.178 and 4.226 GeV. The absolute branching fraction for this decay is measured to be B(D+s→π+π+π−η)=(3.12±0.13stat±0.09syst)%. The first amplitude analysis of this decay reveals the substructures in D+s→π+π+π−η and determines the relative fractions and the phases among these substructures. The dominant intermediate process is D+s→a1(1260)+η,a1(1260)+→ρ(770)0π+ with a branching fraction of (1.73±0.14stat±0.08syst)%. We also observe the W-annihilation process D+s→a0(980)+ρ(770)0, a0(980)+→π+η with a branching fraction of (0.21±0.08stat±0.05syst)%, which is larger than the branching fractions of other measured pure W-annihilation decays by 1 order of magnitude