Measurement of Bottom versus Charm as a Function of Transverse Momentum with Electron-Hadron Correlations in p+p Collisions at sqrt(s)=200 GeV

The momentum distribution of electrons from semi-leptonic decays of charm and bottom for mid-rapidity |y|<0.35 in p+p collisions at sqrt(s)=200 GeV is measured by the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) over the transverse momentum range 2 < p_T < 7 GeV/c. The ratio of the yield of electrons from bottom to that from charm is presented. The ratio is determined using partial D/D^bar --> e^{+/-} K^{-/+} X (K unidentified) reconstruction. It is found that the yield of electrons from bottom becomes significant above 4 GeV/c in p_T. A fixed-order-plus-next-to-leading-log (FONLL) perturbative quantum chromodynamics (pQCD) calculation agrees with the data within the theoretical and experimental uncertainties. The extracted total bottom production cross section at this energy is \sigma_{b\b^bar}= 3.2 ^{+1.2}_{-1.1}(stat) ^{+1.4}_{-1.3}(syst) micro b.Comment: 432 authors, 6 pages text, 3 figures. Submitted to Phys. Rev. Lett. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.htm

Weight and age at puberty and their correlations with morphometric measurements in crossbred breed Suffolk ewe lambs Peso e idade à puberdade e suas correlações com medidas morfométricas em cordeiras mestiças Suffolk

The objective of this study was to identify and to correlate parameters that characterize puberty and estimate the age and weight of Suffolk ewe lambs in Mato Grosso do Sul. This study was carried out with twenty-two Suffolk ewe lambs for 256 days. Blood samples were collected from the jugular vein and centrifugated and the plasma were stored at -20°C until analysis of progesterone (P4) concentration by radioimmunoassay (RIA). The morphometric measurements included: head length and width, body length, elbow height, chest perimeter, back-sternal diameter, croup length, width and height, cannon bone perimeter and shoulder and hip width, using a tape. The animals became pubertal when the plasma progesterone concentration was >1.0 ng/mL, at 34.1 ± 5.2 kg and 39.5 ± 8.5 weeks of age. Meanwhile, the lambs that did not reach puberty (37.7 ± 11.4 weeks of age) were lighter. The morphometric measurements has medium to low correlations with age and weight at puberty.<br>Os objetivos neste trabalho foram identificar e correlacionar parâmetros que caracterizem a puberdade e estimar a idade e o peso à puberdade de cordeiras mestiças Suffolk. Amostras de sangue de 22 borregas foram coletadas e centrifugadas e o plasma armazenado a -20 ºC para posterior análise das concentrações de progesterona (P4) por meio de radioimunoensaio. As medidas morfométricas aferidas foram: comprimento e largura da cabeça; comprimento do corpo; altura de cernelha; perímetro torácico; diâmetro dorso-esternal; comprimento, altura e largura de garupa; perímetro de canela; e largura entre ísquios e ílios, utilizando-se fita métrica. Definiu-se como início da puberdade quando os animais apresentaram concentração plasmática de P4 >1,0 ng/mL, o que ocorreu aos 34,1 ± 5,2 kg de peso vivo e 39,5 ± 8,5 semanas de idade. Entretanto, as cordeiras que não atingiram a puberdade (37,7 ± 11,4 semanas de idade) apresentaram peso menor. As medidas morfométricas apresentam médias e baixas correlações com idade e peso à puberdade