Transverse momentum spectra of charged particles in proton-proton collisions at s=900\sqrt{s} = 900 GeV with ALICE at the LHC

The inclusive charged particle transverse momentum distribution is measured in proton-proton collisions at $\sqrt{s} = 900$ GeV at the LHC using the ALICE detector. The measurement is performed in the central pseudorapidity region $(|\eta|<0.8)$ over the transverse momentum range $0.15<p_{\rm T}<10$ GeV/$c$. The correlation between transverse momentum and particle multiplicity is also studied. Results are presented for inelastic (INEL) and non-single-diffractive (NSD) events. The average transverse momentum for $|\eta|<0.8$ is $\left<p_{\rm T}\right>_{\rm INEL}=0.483\pm0.001$ (stat.) $\pm0.007$ (syst.) GeV/$c$ and \left_{\rm NSD}=0.489\pm0.001 (stat.) $\pm0.007$ (syst.) GeV/$c$, respectively. The data exhibit a slightly larger $\left<p_{\rm T}\right>$ than measurements in wider pseudorapidity intervals. The results are compared to simulations with the Monte Carlo event generators PYTHIA and PHOJET.Comment: 20 pages, 8 figures, 2 tables, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/390

Desempenho De Híbridos De Milho Sob A Ação De Pratylenchus Brachyurus E P. Zeae

Root lesion nematodes (RLN, Pratylenchus spp.) are found in several crops including corn (Zea mays). The aim of this study was to evaluate corn hybrids under the action of two RLN species (Pratylenchus brachyurus and P. zeae), and to study the development of the populations of the nematodes on corn. The assay was conducted in a greenhouse with six corn hybrids (DKB390 PRO, DKB350 PRO, DKB250 PRO, AS1572 PRO, AG8061 PRO, and an Experimental Hybrid). We found that P. zeae populations increased more than P. brachyurus populations in all the hybrids, but P. brachyurus was more harmful to the development of the plants. Although all the hybrids allowed the multiplication of the nematodes, they differed in their response. Fresh leaf mass and P. brachyurus multiplication were higher in the hybrid AG8061 PRO. Based on these results, it is not possible to assume that these hybrids are resistant to RLN, but they may possess a source of resistance to the RLN in their background.461717

Desenvolvimento De Cultivares De Goiabeira Inoculadas Com Meloidogyne Enterolobii

The guava tree (Psidium guajava L.) is highly susceptible to the root-knot nematode Meloidogyne enterolobii, which causes significant losses in orchards. Due to these nematodes, many guava growers change to different crops, most of which are less profitable and require a higher technological production system. The aim of this work was to evaluate the development of the guava tree cultivars 'Paluma', 'Pedro Sato', 'Século XXI', and 'Tailandesa' parasitized by M. enterolobii and to compare parasitized plants with non-parasitized plants. Evaluations were carried out at 6 mo after nematode inoculation, and included plant height, stem diameter, fresh leaf mass, fresh roots mass, nematode root population, and the whole plant visual aspect. The tested cultivars were all hosts and allowed nematode population growth. 'Tailandesa' supported less nematode population growth than the other cultivars, and also had taller plants and higher mass of fresh leaves and roots. The overall visual appearance was also better for this cultivar, indicating greater tolerance to M. enterolobii.461545

The Alice Collaboration

8301-4919c924

Charged-particle multiplicity measurement in proton-proton collisions at root s=7 TeV with ALICE at LHC

The pseudorapidity density and multiplicity distribution of charged particles produced in proton-proton collisions at the LHC, at a centre-of-mass energy root s = 7 TeV, were measured in the central pseudorapidity region vertical bar eta vertical bar < 1. Comparisons are made with previous measurements at root s = 0.9 TeV and 2.36 TeV. At root s = 7 TeV, for events with at least one charged particle in |eta vertical bar| < 1, we obtain dN(ch)/d eta = 6.01 +/- 0.01(stat.)(-0.12)(+0.20) (syst.). This corresponds to an increase of 57.6%+/-0.4%(stat.)(-1.8%)(+3.6) (syst.) relative to collisions at 0.9 TeV, significantly higher than calculations from commonly used models. The multiplicity distribution at 7 TeV is described fairly well by the negative binomial distribution

Transverse momentum spectra of charged particles in proton–proton collisions at √s=900 GeV with ALICE at the LHC

The inclusive charged particle transverse momentum distribution is measured in proton–proton collisions at s=900 GeV at the LHC using the ALICE detector. The measurement is performed in the central pseudorapidity region (|η|<0.8) over the transverse momentum range 0.15<pT<10 GeV/c. The correlation between transverse momentum and particle multiplicity is also studied. Results are presented for inelastic (INEL) and non-single-diffractive (NSD) events. The average transverse momentum for |η|<0.8 is 〈pT〉INEL=0.483±0.001 (stat.)±0.007 (syst.) GeV/c and 〈pT〉NSD=0.489±0.001 (stat.)±0.007 (syst.) GeV/c, respectively. The data exhibit a slightly larger 〈pT〉 than measurements in wider pseudorapidity intervals. The results are compared to simulations with the Monte Carlo event generators PYTHIA and PHOJET