Sistema tradicional de manejo de caprinos: I. Desempenho de crescimento de caprinos SRD na fase de aleitamento

The effects of season, sex and type of birth as well as all possible interactions were studied for birth weight (BW), weights at 41 (W1), 69 (W2), 97 (W3), and 125 (W4) days after birth and weight gains at intervals between the time of birth and 41 days of age (G1), 41 and 69 days (G2), 69 and 97 days (G3), 97 and 125 days (G4) of age after birth. Data were initialy recorded on 120 kids born in the years 1979 and 1980 and raised at the Centro Nacional de Pesquisa de Caprinos research farm, Sobral, State of Ceará, Brazil. The analysis of variance showed that season of birth had a highly significant (P<0.005) effect on alt weights analysed and on G1 and G4. The significant level was smaller (P<0.025) for G2 and G3 . Kids born in the rainy season were heavier and had higher weight gains than kids born in the dry season. Sex had a significant influence on BW, W2, W4 (P<0.05), W3 (P<0.025), W1 and G1 (P<0.005). Males were superior to females, except in G4 where an inverse trend was observed. Type of birth was significant (P<0.005) for all the weight variables studied, including G1. Single born kids showed higher weight gains than did multiple born kids. With the exception of the season X type of birth interaction which was significant (P <0.025) for BW, all other interactions analized were none significant for the variables studied.Foram estudados os efeitos da estação, sexo e tipo de nascimento, bem como os das interações possíveis, sobre os pesos ao nascimento (PN); aos 41 (P1); aos 69 (P2); aos 97 (P3) e aos 125 (P4) dias de idade e sobre os ganhos de peso do nascimento aos 41 (G1); dos 41 aos 69 (G2); dos 69 aos 97 (G3) e dos 97 aos 125 (G4) dias de idade. Foram utilizados 120 cabritos, criados na área experimental do Centro Nacional de Pesquisa de Caprinos, em Sobral, CE, nascidos entre os anos de 1979 e 1980. As análises de variância indicaram que a estação de nascimento influenciou de maneira significativa (P<0,005) todos os pesos estudados, além das variáveis G1 e G4, e ao nível de P<0,025, as variáveis G2 e G3. Os animais nascidos na estação chuvosa foram mais pesados e apresentaram maior ganho de peso, em relação aos nascidos na estação seca. O sexo influenciou o P1 e G1 (P<0,005) e o PN, P2 e P4 (P<0,05) e P3 (P<0,025), sendo que, nessas variáveis, os machos foram superiores às fêmeas, exceto em G4, nas quais se observou tendência inversa. Houve influência do tipo de nascimento sobre todos os pesos estudados, inclusive sobre o G1, (P<0,005); os animais nascidos de partos simples mostraram maior ganho de peso que os nascidos de partos múltiplos. Com exceção da interação estação X tipo de nascimento, que influenciou de maneira significativa (P<0,025) o PN, as demais interações não apresentaram efeito significativo sobre as variáveis estudadas

Search for a W' boson decaying to a bottom quark and a top quark in pp collisions at sqrt(s) = 7 TeV

Results are presented from a search for a W' boson using a dataset corresponding to 5.0 inverse femtobarns of integrated luminosity collected during 2011 by the CMS experiment at the LHC in pp collisions at sqrt(s)=7 TeV. The W' boson is modeled as a heavy W boson, but different scenarios for the couplings to fermions are considered, involving both left-handed and right-handed chiral projections of the fermions, as well as an arbitrary mixture of the two. The search is performed in the decay channel W' to t b, leading to a final state signature with a single lepton (e, mu), missing transverse energy, and jets, at least one of which is tagged as a b-jet. A W' boson that couples to fermions with the same coupling constant as the W, but to the right-handed rather than left-handed chiral projections, is excluded for masses below 1.85 TeV at the 95% confidence level. For the first time using LHC data, constraints on the W' gauge coupling for a set of left- and right-handed coupling combinations have been placed. These results represent a significant improvement over previously published limits.Comment: Submitted to Physics Letters B. Replaced with version publishe

Search for the standard model Higgs boson decaying into two photons in pp collisions at sqrt(s)=7 TeV

A search for a Higgs boson decaying into two photons is described. The analysis is performed using a dataset recorded by the CMS experiment at the LHC from pp collisions at a centre-of-mass energy of 7 TeV, which corresponds to an integrated luminosity of 4.8 inverse femtobarns. Limits are set on the cross section of the standard model Higgs boson decaying to two photons. The expected exclusion limit at 95% confidence level is between 1.4 and 2.4 times the standard model cross section in the mass range between 110 and 150 GeV. The analysis of the data excludes, at 95% confidence level, the standard model Higgs boson decaying into two photons in the mass range 128 to 132 GeV. The largest excess of events above the expected standard model background is observed for a Higgs boson mass hypothesis of 124 GeV with a local significance of 3.1 sigma. The global significance of observing an excess with a local significance greater than 3.1 sigma anywhere in the search range 110-150 GeV is estimated to be 1.8 sigma. More data are required to ascertain the origin of this excess.Comment: Submitted to Physics Letters

Measurement of the Lambda(b) cross section and the anti-Lambda(b) to Lambda(b) ratio with Lambda(b) to J/Psi Lambda decays in pp collisions at sqrt(s) = 7 TeV

The Lambda(b) differential production cross section and the cross section ratio anti-Lambda(b)/Lambda(b) are measured as functions of transverse momentum pt(Lambda(b)) and rapidity abs(y(Lambda(b))) in pp collisions at sqrt(s) = 7 TeV using data collected by the CMS experiment at the LHC. The measurements are based on Lambda(b) decays reconstructed in the exclusive final state J/Psi Lambda, with the subsequent decays J/Psi to an opposite-sign muon pair and Lambda to proton pion, using a data sample corresponding to an integrated luminosity of 1.9 inverse femtobarns. The product of the cross section times the branching ratio for Lambda(b) to J/Psi Lambda versus pt(Lambda(b)) falls faster than that of b mesons. The measured value of the cross section times the branching ratio for pt(Lambda(b)) > 10 GeV and abs(y(Lambda(b))) < 2.0 is 1.06 +/- 0.06 +/- 0.12 nb, and the integrated cross section ratio for anti-Lambda(b)/Lambda(b) is 1.02 +/- 0.07 +/- 0.09, where the uncertainties are statistical and systematic, respectively.Comment: Submitted to Physics Letters

Search for new physics in events with opposite-sign leptons, jets, and missing transverse energy in pp collisions at sqrt(s) = 7 TeV

A search is presented for physics beyond the standard model (BSM) in final states with a pair of opposite-sign isolated leptons accompanied by jets and missing transverse energy. The search uses LHC data recorded at a center-of-mass energy sqrt(s) = 7 TeV with the CMS detector, corresponding to an integrated luminosity of approximately 5 inverse femtobarns. Two complementary search strategies are employed. The first probes models with a specific dilepton production mechanism that leads to a characteristic kinematic edge in the dilepton mass distribution. The second strategy probes models of dilepton production with heavy, colored objects that decay to final states including invisible particles, leading to very large hadronic activity and missing transverse energy. No evidence for an event yield in excess of the standard model expectations is found. Upper limits on the BSM contributions to the signal regions are deduced from the results, which are used to exclude a region of the parameter space of the constrained minimal supersymmetric extension of the standard model. Additional information related to detector efficiencies and response is provided to allow testing specific models of BSM physics not considered in this paper.Comment: Replaced with published version. Added journal reference and DO

Measurement of isolated photon production in pp and PbPb collisions at sqrt(sNN) = 2.76 TeV

Isolated photon production is measured in proton-proton and lead-lead collisions at nucleon-nucleon centre-of-mass energies of 2.76 TeV in the pseudorapidity range |eta|<1.44 and transverse energies ET between 20 and 80 GeV with the CMS detector at the LHC. The measured ET spectra are found to be in good agreement with next-to-leading-order perturbative QCD predictions. The ratio of PbPb to pp isolated photon ET-differential yields, scaled by the number of incoherent nucleon-nucleon collisions, is consistent with unity for all PbPb reaction centralities.Comment: Submitted to Physics Letters