28,410 research outputs found
Interpretations and implications of the top quark rapidity asymmetries A(FB)(t) and A(FB)(l)
No full textForward-backward asymmetries A(FB)(t) and A(FB)(l) are observed in the top-quark t rapidity distribution and in the rapidity distribution of charged leptons l from top-quark decay at the Tevatron proton-antiproton collider, and a charge asymmetry A(C) is seen in proton-proton collisions at the Large Hadron Collider (LHC). In this paper, we update our previous studies of the Tevatron asymmetries using the most recent data. We provide expectations for AC at the LHC based first on simple extrapolations from the Tevatron, and second based on new physics models that can explain the Tevatron asymmetries. We examine the relationship of the two asymmetries A(FB)(t) and A(FB)(l). We show their connection through the (V - A) spin correlation between the charged lepton and the top quark with different polarization states. We show that the ratio of the two asymmetries provides independent insight into the physics interpretation of the top-quark asymmetry. We emphasize the value of the measurement of both asymmetries, and we conclude that a model which produces more right-handed than left-handed top quarks is suggested by the present Tevatron data.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000322145600004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Astronomy & AstrophysicsPhysics, Particles & FieldsSCI(E)7ARTICLE1null8
Top Quark Production Asymmetries A(FB)(t) and A(FB)(l)
No full textA large forward-backward asymmetry is seen in both the top quark rapidity distribution A(FB)(t) and in the rapidity distribution of charged leptons A(FB)(l) from top quarks produced at the Tevatron. We study the kinematic and dynamic aspects of the relationship of the two observables arising from the spin correlation between the charged lepton and the top quark with different polarization states. We emphasize the value of both measurements, and we conclude that a new physics model which produces more right-handed than left-handed top quarks is favored by the present data.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000300247100002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Physics, MultidisciplinarySCI(E)EI20ARTICLE6null10
Beer samples with confirmed FB contaminations (μg/L).
No full textBeer samples with confirmed FB contaminations (μg/L).</p
Heavy metal bioaccumulation by the important food plant, olea europaea L., in an ancient metalliferous polluted area of Cyprus
No full textAspects of the bioaccumulation of heavy metals are reviewed and possible evidence of homeostasis is highlighted. Examination and analysis of olive (Olea europaea L.) trees growing in close proximity to a copper dominated spoil tip dating from at least 2000 years BP, on the island of Cyprus, revealed both bioaccumulation and partitioning of copper, lead and zinc in various parts of the tree. A factor to quantify the degree of accumulation is illustrated and a possible seed protective mechanism suggested
Search for heavy resonances decaying into a pair of Z bosons in the l+l−l′+l′− and l+l−νν ̄ final states using 139 fb−1 of proton–proton collisions at √s = 13 TeV with the ATLAS detector
No full textA search for heavy resonances decaying into a pair of Z bosons leading to l+l−l′+l′− and l+l−νν ̄ final states, where l stands for either an electron or a muon, is presented. The search uses proton–proton collision data at a centre-of-mass energy of 13 TeV collected from 2015 to 2018 that corresponds to the integrated luminosity of 139 fb−1 recorded by the ATLAS detector during Run 2 of the Large Hadron Collider. Different mass ranges spanning 200 GeV to 2000 GeV for the hypothetical resonances are considered, depending on the final state and model. In the absence of a significant observed excess, the results are interpreted as upper limits on the production cross section of a spin-0 or spin-2 resonance. The upper limits for the spin-0 resonance are translated to exclusion contours in the context of Type-I and Type-II two-Higgs-doublet models, and the limits for the spin-2 resonance are used to constrain the Randall–Sundrum model with an extra dimension giving rise to spin-2 graviton excitations
Levels of intermediates involved in L-tryptophan biosynthesis detected in FB-04, FB-04(<i>Δpta</i>), and FB-04(<i>pta</i>1).
No full textThe strains along the x-axes are FB-04, FB-04(Δpta), and FB-04(pta1), successively. The y-axes reflect the relative abundance of each intermediate, which was calculated by normalization of the peak area of each metabolite against total peak area within sample. Glc, glucose; G6P, glucose-6-phosphate; F6P, fructose-6-phosphate; 1,6-BP, fructose-1,6-bisphosphate; GA3P, glyceraldehyde-3-phosphate; 3-PG, 3-phosphoglycerate; 2-PG, 2-phosphoglycerate; PEP, phosphoenolpyruvate; PYR, pyruvate; AcCoA, acetyl coenzyme A; CIT, citrate; ICI, isocitrate; 2-OXO, 2-oxoglutarate; SUCCoA, succinyl coenzyme A; SUCC, succinate; FUM, fumarate; MAL, malate; OAA, oxaloacetate; G-LAC, 6-phosphoglucono-1,5-lactone; 6-PGT, 6-phosphogluconate; Ru5P, ribulose-5-phosphate; X5P, xylulose-5-phosphate; R5P, ribose-5-phosphate; S7P, sedoheptulose-7-phosphate; E4P, erythrose- 4-phosphate; DAHP, 3-deoxy-d-arabinoheptulosonate-7-phosphate; DHQ, 3-dehydroquinate; Quin, quinone; DHS, 3-dehydroshikimate; SHIK, shikimate; S3P, shikimate-3-phosphate; EPSP, 5-enolpyruvoylshikimate; CHA; chorismate; ANTA, anthranilate; PRAA, phosphoribosyl anthranilate; CDRP, 1-(o-carboxyphenylamino)-1-deoxyribulose-5-phosphate; I3GP, indole 3-glycerolphosphate; L-Trp, L-tryptophan; Acetyl-p, acetyl phosphate; GLYOXY, glyoxylate pathway.</p
Steam hydration of FB calcium looping sorbents
No full textThis paper deals with steam hydration as a reactivation technique of the CO2 capture potential of
spent limestone-based sorbents from FB calcium looping (CaL) systems. A reference, high-calcium,
reactive limestone was deactivated by carrying out lab-scale FB CaL tests (calcination at 940°C in a
70% CO2 atmosphere; carbonation at 650°C in a 15% CO2 atmosphere), and then steam hydrated (at
250°C in a 50% steam atmosphere) in the same FB, for times ranging from 10 to 60 min. On-line flue
gas analysis, continuous capture of the elutriated fines and particle size distribution analysis were
performed on the reactivated sorbents upon additional CaL tests, while thermogravimetry, scanning
electron microscopy and porosimetry were employed as experimental techniques to characterize the
spent and the steam hydrated sorbents. In this way, it was possible to investigate the effect of the
hydration time on: the changes in the physico–chemical and microstructural properties induced by the
hydration treatment; the reactivation of the sorbent CO2 capture capacity; the attrition/fragmentation
tendency of the reactivated materials
Enhancement of paracetamol induced hepatotoxicity by prior treatment with carboxymethylcellulose.
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