Leptogenesis in Neutrino Textures with Two Zeros

The leptogenesis is studied in the neutrino textures with two zeros, which reduce the number of independent phases of the CP violation. The phenomenological favored neutrino textures with two zeros are decomposed into the Dirac neutrino mass matrix and the right-handed Majorana one in the see-saw mechanism. Putting the condition to suppress the $\mu \to e\gamma$ decay enough, the texture zeros of the Dirac neutrino mass matrix are fixed in the framework of the MSSM with right-handed neutrinos. These textures have only one CP violatig phase. The magnitude of each entry of the Dirac mass matrix is determined in order to explain the baryon asymmetry of the universe by solving the Boltzman equations. The relation between the leptogenesis and the low energy CP violation is presented in these textures.Comment: Latex file with 20 pages, 6 eps figure

Measurement of the ttbar Production Cross Section in ppbar collisions at sqrt s = 1.96 TeV in the All Hadronic Decay Mode

We report a measurement of the ttbar production cross section using the CDF-II detector at the Fermilab Tevatron. The analysis is performed using 311 pb-1 of ppbar collisions at sqrt(s)=1.96 TeV. The data consist of events selected with six or more hadronic jets with additional kinematic requirements. At least one of these jets must be identified as a b-quark jet by the reconstruction of a secondary vertex. The cross section is measured to be sigma(tbart)=7.5+-2.1(stat.)+3.3-2.2(syst.)+0.5-0.4(lumi.) pb, which is consistent with the standard model prediction.Comment: By CDF collaboratio

Search for long-lived doubly charged Higgs bosons in p(p)over-bar collisions at root s=1.96 TeV

We present a search for long-lived doubly charged Higgs bosons (H+/-+/-), with signatures of high ionization energy loss and muonlike penetration. We use 292 pb(-1) of data collected in p (p) over bar collisions at root s=1.96 TeV by the CDF II detector at the Fermilab Tevatron. Observing no evidence of long-lived doubly charged particle production, we exclude H-L(+/-+/-) and H-R(+/-+/-) bosons with masses below 133 GeV/c(2) and 109 GeV/c(2), respectively. In the degenerate case we exclude H+/-+/- mass below 146 GeV/c(2). All limits are quoted at the 95% confidence level

Measurement of the W+W- Production Cross Section in ppbar Collisions at sqrt(s)=1.96 TeV using Dilepton Events

We present a measurement of the W+W- production cross section using 184/pb of ppbar collisions at a center-of-mass energy of 1.96 TeV collected with the Collider Detector at Fermilab. Using the dilepton decay channel W+W- -> l+l-vvbar, where the charged leptons can be either electrons or muons, we find 17 candidate events compared to an expected background of 5.0+2.2-0.8 events. The resulting W+W- production cross section measurement of sigma(ppbar -> W+W-) = 14.6 +5.8 -5.1 (stat) +1.8 -3.0 (syst) +-0.9 (lum) pb agrees well with the Standard Model expectation.Comment: 8 pages, 2 figures, 2 tables. To be submitted to Physical Review Letter

The T2K experiment

The T2K experiment is a long baseline neutrino oscillation experiment. Its main goal is to measure the last unknown lepton sector mixing angle θ13 by observing νe appearance in a νμ beam. It also aims to make a precision measurement of the known oscillation parameters, and sin22θ23, via νμ disappearance studies. Other goals of the experiment include various neutrino cross-section measurements and sterile neutrino searches. The experiment uses an intense proton beam generated by the J-PARC accelerator in Tokai, Japan, and is composed of a neutrino beamline, a near detector complex (ND280), and a far detector (Super-Kamiokande) located 295 km away from J-PARC. This paper provides a comprehensive review of the instrumentation aspect of the T2K experiment and a summary of the vital information for each subsystem

Efeitos de herbicidas nos teores de macronutrientes e nas características tecnológicas da cana-de-açúcar (Saccharum spp.). I - Misturas de herbicidas em pós-emergência Effect of herbicides on the macronutrient levels and on the tecnologic characteristics of sugarcane (Saccharum spp). I - Mixtures of postemergence herbicides

A presente pesquisa foi conduzida em um Latossol Roxo, com 3,9% de matéria orgânica, na Usina São Carlos, município de Jaboticabal - SP com o objetivo de verificar o comportamento das principais misturas de herbicidas aplicadas em pós-emergência e suas possíveis interferências nos teores de macronutrientes, e no desenvolvimento da variedade CB 41-14. Os tratamentos utilizados com as respectivas doses do ingrediente ativo em kg/ha foram: ametryne + 2,4 - D (formulação comercial) a 1,47 - 2,03, diuron + 2,4 -D a 1,60 + 2,16; ametryne + 2,4-D a 1,60 + 2,16; alachlor + 2,4-D a 1,09 + 1,80; asulam + ioxynil - 2,4-D a 2,80 + 1,75; MCPA + 2,4-D a 0,83 + 0,83; oxadiazon + 2,4 -D a 0,50 + 2,16; ametryne + simazine + 2,4-D a 1,25 + 1,25 + 2,16; ametryne + secbumetone + 2,4-D a 2,00 + 2,00 + 2,16; diuron + hexazinone + surfatante a 0,80 + 0,45 + 0,5% e MCPA + 2,3,6-TBA + pendimethalin + surfatante a 1,50 + 0,48 + 0,66 + 0,5%. O controle das plantas daninhas foi avaliado através de contagens por espécie botânica e por avaliações visuais . Sobre a cultura os efeitos foram constatados pela contagem da brotação inicial, avaliações visuais dos efeitos fitotóxicos, análise dos teores de macronutrientes aos 5 e 8 meses, medidas do comprimento dos colmos, análise dos teores de fibra, pol, brix, % de cana e pureza, assim como valores de pol/ha, e peso de colmos por hectare. Não houve interferência das diferentes misturas de herbicidas na brotação inicial, no comprimento médio dos colmos, e nos teores de fibra, pol, brix e pureza por ocasião da colheita. Em relação às principais plantas daninhas presentes na área, que eram capim-colchão (Digitaria sanguinalis (L). Scop.) capim-coloniâo (Panicum maximum Jacq), beldroega (Portulacca oleracea L.) e caruru (Amaranthus spp), as melhores porcentagens de controle foram obtidas com as misturas de ametryne + 2,4-D, MCPA + 2,4-D, oxadiazon + 2,4-D, ametryne + secbumetone, diuron + hexazinone e MCPA + 2,3,6-TBA + pendimethalin. Aos cinco meses o teor de P foi diminuido pela mistura de ametryne + secbumetone + 2,4-D, e o teor de Ca decresceu pelas misturas de diuron + 2,4-D, ametryne + 2,4-D, alachlor + 2,4-D, asulam + ioxynil + 2,4-D, MCPA + 2,4-D, oxadiazon + 2,4-D, ametryne + simazine + 2,4-D e ametryne + secbumetone + 2,4-D. Já aos oito meses não houve diferença estatística para qualquer dos nutrientes estudados. Os teores de pol/ha e produção de colmos/ha não foram significativamente afetados por qualquer dos tratamentos quando comparados com a testemunha com capina. Todavia, todos os tratamentos apresentaram produção inferior a esta, sugerindo certa precaução com as aplicações pós-emergentes em canade-açúcar.<br>The present research was conducted in the São Carlos Sugar Mill. Jaboticabal - SP in a oxisol (Latossolic B) containing 3,9% organic matter. with the obje tive to study the behavior of the main post-emergence herbicide mixtures, in the sugarcane crop for weed control, and their interferences on the macronutrient levels and development of CB 41-14 variety. The treatments in kg of active ingredient per hectare were: ametryne + 2,4-D (comercial formulation) at 1,47 -t 2,03; diuron + 2,4-D at 1,60 + 2,16: ametryne + 2,4-D at 1,60 + 2,16; alachlor + 2,4-D at 1,09 + 1,08; asulam + ioxynil 2,4 -D at 2,8 + 1,75; MCPA + 2,4-D at 0,83 + 0,83; oxadiazon 2,4-D at 0,50 + 2,16; ametryne + simazine + 2,4-D at 1,25 1,25 + 2,16; ametryn + secbumeton + 2,4 -D at 2,00 + 2,00 + 2,16; diuron + hexazinone + surfactant at 0,80 + 0,45 + 0,5% and MCPA + 2,3 ,6 -TBA + pendimethalin + surfactant at 1,50 + 0,48 + 0,66 + 0,5% . The weed control was evaluated by counting the surviving weeds, and by visual evaluation according to the scale of the "AssociacionLatinoamericana de Malezas" (ALAM). The effects on the crop were evaluated by counting the fresh-emerging sugarcane plants, visual evaluating of herbicide injuries, analysis of macronutrients levels in the leaves at 5 and 8 months after planting, measures of the lenght of the culms, analysis of fibers, brix, purity and poi and the values of pot/ha and weight of culms/ha. Any interference of the herbicide mixtures. was not observed on the ini tial growth, the average lenght of the culms, the fiber, pol, brix or purity. The best weed control was obtained by the mixtures ametryn + 2,4-D, MCPA + 2,4-D, oxadiazon + 2,4-D, ametryn + secbumeton, diuron + hexazinone and MCPA + 2,3,6 TBA + pendimethalin, and the principal weeds present in the area were Digitaria sanguinalis (L .) Scop, Panicum maximum Jacq., Portulacca oleracea L. and Amaranthus spp. The P content level was reduced by ametryn + secbumeton t 2,4-D and the Ca reduced by diuron + 2,4-D, ametryn ; 2,4-D, alachlor + 2,4-D, asulam + ioxynil + 2,4-D, MCPA + 2,4-D, oxadiazon + 2,4-D, ametryn + simazine + 2,4-D and ametryn + secbumeton + 2,4-D at 5 months. At 8 months no effect on the macronutrient levels was observed. The values of po l/ha and weight of culms/ha were not affected by the treatments when compared with the hoed control, but all treatments yielded less than the hoed control