Search results for "ZEUS"
showing 10 items of 33 documents
New Results on Charm Production at HERA
2014
The copious production of charm quarks at HERA yielded measure- ments of the charm contribution to the proton structure and of the charm mass and fragmentation parameters of charmed hadrons. Several measure- ments of charm production in deep inelastic scattering from the H1 and ZEUS collaborations as well as combined data are presented. They provide a powerful vindication of the form of the gluon density in the proton de- rived from scaling violations of inclusive deep inelastic scattering data. A QCD fit to the charm data leads to a measurement of the charm mass and provides precise predictions e.g. for W and Z production at the LHC. In ad- dition, charm fragmentation fractions in photopro…
Inclusive D∗-meson production in ep scattering at low Q2 in the GM-VFN scheme at NLO
2009
Abstract We have calculated the next-to-leading order cross sections for the inclusive production of D ∗ -mesons in ep collisions at HERA for finite, although very small Q 2 . In this Q 2 -range, the same approximations as for photoproduction can be used. Our calculation is performed in the general-mass variable-flavour-number scheme. In this approach, large logarithms of the charm transverse momentum are resummed and finite terms depending on m 2 / p T 2 are kept in the hard scattering cross sections. The theoretical results are compared with recent data from the ZEUS Collaboration at HERA. On average, we find good agreement.
High $p_{T}$ Leptons and W Production at HERA
1999
Details are given of the observation by H1 of events containing high P_T leptons in addition to large missing P_T. A closely related ZEUS analysis, including a preliminary measurement of the W production cross section, is discussed and the two experiments are compared. Some possible non-Standard Model sources for the events are considered.
Gas chromatography-mass spectrometry study of polycyclic aromatic hydrocarbons in grass and milk from urban and rural farms
2000
Polycyclic aromatic hydrocarbon (PAH) levels were studied in grass and milk sampled at two farms, one located in a non-contaminated, rural area, and another located in a urban area close to PAH sources such as highways, busy roads, fuel-powered trains and a steel plant. PAH concentration were measured by gas chromatography coupled to mass spectrometry (GC-MS) using internal deuterated standards. In grasses, unexpectedly, although the sum of PAH concentrations was only slightly higher at the urban farm (83.1 ± 16.1 ng g−1) than the rural farm (51.8 ± 10.6 ng g−1), this difference was not observed for all PAH members. This absence of a striking difference of PAH levels between urban and rura…
First global next-to-leading order determination of diffractive parton distribution functions and their uncertainties within the {\tt xFitter} framew…
2018
We present {\tt GKG18-DPDFs}, a next-to-leading order (NLO) QCD analysis of diffractive parton distribution functions (diffractive PDFs) and their uncertainties. This is the first global set of diffractive PDFs determined within the {\tt xFitter} framework. This analysis is motivated by all available and most up-to-date data on inclusive diffractive deep inelastic scattering (diffractive DIS). Heavy quark contributions are considered within the framework of the Thorne-Roberts (TR) general mass variable flavor number scheme (GM-VFNS). We form a mutually consistent set of diffractive PDFs due to the inclusion of high-precision data from H1/ZEUS combined inclusive diffractive cross sections me…
Le armi dal complesso sacro di Contrada Gaggera a Selinunte: alcuni dati preliminari
2022
The review of bronze finds from the excavations carried out in the contrada Gaggera sanctuaries from 1888 until 1925 as well as in the sixties and seventies of the last century, and the reading of old excavation notebooks have allowed the identification of a huge number of unpublished weapons. This evidence has also been considered in relation to what has been published by Ettore Gabrici in the 1927 edition of the Malophoros sanctuary. The study better clarifies the finding context of these materials (from the sanctuary of Demeter Malophoros or from the sacred area of Zeus Meilichios) and provides an overview of the different types of weapons. The most recurring objects turn out to be arrow…
Purificare e salvare la polis. Alcune osservazioni sulla “colonna B” della Lex Sacra di Selinunte
2012
Il confronto con alcuni rilievi attici e con la parte finale dell'Anabasi di Senofonte consente di proporre una identificazione plausibile dell'epiclesi di Zeus, unica divinità menzionata nella colonna B della Lex sacra di Selinunte.
Zeus Meilichios a Selinunte
2010
«C’est grâce à ces dieux que les Sélinontains sont vainqueurs». Une liste de divinités dans l’inscription du temple G à Sélinonte
2023
L'article se propose de revenir sur l'inscription dite « de la Victoire » (IG XIV 268), trouvée en 1871 par l'archéologue F.S. Cavallari parmi les ruines du Temple G de Sélinonte, identifié par la suite comme un Olympieion. L’inscription mentionne une liste de neuf puissances divines grâce auxquelles les habitants de Sélinonte déclarent obtenir la victoire. L’occasion et la datation de cette dédicace sont malheureusement inconnues, mais le décodage de la logique qui sous-tend l’articulation de cet assemblage divin permet de formuler d’autres amorces de réflexion sur ce document sur lequel plusieurs spécialistes se sont déjà penchés. L'examen du contexte local et la comparaison avec d'autres…
Zeus Meilichios
1993
Analisi del culto greco di Zeus Meilichios: ricostruzione del dossier letterario ed epigrafico. Funzioni del culto: purificazione, prosperità, soteria. Aspetti pubblici e privati.