1,760 research outputs found
Doubinger J., Adloff M.-C. et Palain C. (1970). — Nouvelles précisions stratigraphiques sur la série de base du Mézozoïque portugais. C. R. Acad. Sci. Paris, 270 D, p. 1770-1772
No full textDoubinger J., Adloff M.-C. et Palain C. (1970). — Nouvelles précisions stratigraphiques sur la série de base du Mézozoïque portugais. C. R. Acad. Sci. Paris, 270 D, p. 1770-1772. In: Bulletin du Service de la carte géologique d'Alsace et de Lorraine, tome 23, n°3-4, 1970. Sédimentologie et géochimie de la surface. p. 225
Doubinger J., Adloff M.-C. et Palain C. (1970). — Nouvelles précisions stratigraphiques sur la série de base du Mézozoïque portugais. C. R. Acad. Sci. Paris, 270 D, p. 1770-1772
No full textDoubinger J., Adloff M.-C. et Palain C. (1970). — Nouvelles précisions stratigraphiques sur la série de base du Mézozoïque portugais. C. R. Acad. Sci. Paris, 270 D, p. 1770-1772. In: Bulletin du Service de la carte géologique d'Alsace et de Lorraine, tome 23, n°3-4, 1970. Sédimentologie et géochimie de la surface. p. 225
Measurement of the Inclusive Di-Jet Cross Section in Photoproduction and Determination of an Effective Parton Distribution in the Photon
No full textThe double-differential inclusive di-jet cross section in photoproduction processes is measured with the H1 detector at HERA. The cross section is determined as a function of the average transverse jet energy E jets T for ranges of the fractional energy x jets fl of the parton from the photon side. An effective leading order parton distribution in the photon is determined at large parton fractional energies for scales between 80 ! p 2 T ! 1250GeV 2 . The measurement is compatible with the logarithmic scale dependence that is predicted by perturbative QCD. C. Adloff 35 , S. Aid 13 , M. Anderson 23 , V. Andreev 26 , B. Andrieu 29 , V. Arkadov 36 , C. Arndt 11 , I. Ayyaz 30 , A. Babaev 25 , J. Bahr 36 , J. B'an 18 , P. Baranov 26 , E. Barrelet 30 , R. Barschke 11 , W. Bartel 11 , U. Bassler 30 , M. Beck 14 , H.-J. Behrend 11 , C. Beier 16 , A. Belousov 26 , Ch. Berger 1 , G. Bernardi 30 , G. Bertrand-Coremans 4 , R. Beyer 11 , P. B..
Photo-Production of
No full textQuasi-elastic (z ? 0:95) photo-production of /(2S) mesons has been observed at HERA for photon-proton centre-of-mass energies in the range 40 to 160 GeV. The /(2S) mesons were identified through their decays to ` + ` \Gamma and to J=/ ß + ß \Gamma , where the J=/ subsequently decays to ` + ` \Gamma , the lepton ` being either a muon or an electron. The cross-section for quasi-elastic photoproduction was measured to be (18:0 \Sigma 2:8(stat) \Sigma 3:0(syst)) nb at a photon-proton centre-of-mass energy of 80 GeV. The ratio of the /(2S) to J=/ quasi-elastic cross-sections is (0:150 \Sigma 0:027(stat) \Sigma 0:022(syst)). Submitted to Physics Letters B C. Adloff 35 , S. Aid 13 , M. Anderson 23 , V. Andreev 26 , B. Andrieu 29 , V. Arkadov 36 , C. Arndt 11 , I. Ayyaz 30 , A. Babaev 25 , J. Bahr 36 , J. B'an 18 , P. Baranov 26 , E. Barrelet 30 , R. Barschke 11 , W. Bartel 11 , U. Bassler 30 , M. Beck 14 , H.-J. Behrend 11 , C. Beier 16 , ..
Photoproduction of
No full textInclusive K 0 and photoproduction has been investigated at HERA with the H1 detector at an average photon-proton center of mass energy of 200 GeV in the transverse momentum range 0:5 ! p t ! 5 GeV. The production rates as a function of p t and center of mass rapidity are compared to those obtained in deep inelastic scattering at hQ 2 i = 23 GeV 2 . A similar comparison is made of the rapidity spectra of charged particles. The rate of strangeness photoproduction is compared with p¯p measurements. The observations are also compared with next-to-leading order QCD calculations and the predictions of a Monte Carlo model. C. Adloff 35 , S. Aid 13 , M. Anderson 23 , V. Andreev 26 , B. Andrieu 29 , V. Arkadov 36 , C. Arndt 11 , I. Ayyaz 30 , A. Babaev 25 , J. Bahr 36 , J. B'an 18 , Y. Ban 28 , P. Baranov 26 , E. Barrelet 30 , R. Barschke 11 , W. Bartel 11 , U. Bassler 30 , H.P. Beck 38 , M. Beck 14 , H.-J. Behrend 11 , A. Belousov 26 , Ch. Berg..
Hadron Production in Diffractive Deep-Inelastic Scattering
No full textCharacteristics of hadron production in diffractive deep-inelastic positron-proton scattering are studied using data collected in 1994 by the H1 experiment at HERA. The following distributions are measured in the centre-of-mass frame of the photon dissociation system: the hadronic energy flow, the Feynman-x (x F ) variable for charged particles, the squared transverse momentum of charged particles (p 2 T ), and the mean p 2 T as a function of x F . These distributions are compared with results in the fl p centre-of-mass frame from inclusive deep-inelastic scattering in the fixed-target experiment EMC, and also with the predictions of several Monte Carlo calculations. The data are consistent with a picture in which the partonic structure of the diffractive exchange is dominated at low Q 2 by hard gluons. Submitted to Physics Letters B C. Adloff 35 , S. Aid 13 , M. Anderson 23 , V. Andreev 26 , B. Andrieu 29 , V. Arkadov 36 , C. Arndt 11 , I. Ayyaz 30 , A. Baba..
Adloff M.C., Doubinger J. et Palain C. (1974) — Contribution à la palynologie du Trias et du Lias inférieur du Portugal. «Grès de Silves» du Nord du Tage. Comm. Serv. Geol. Portugal, LVIII, p. 91 -144
No full textAunis Danièle. Adloff M.C., Doubinger J. et Palain C. (1974) — Contribution à la palynologie du Trias et du Lias inférieur du Portugal. «Grès de Silves» du Nord du Tage. Comm. Serv. Geol. Portugal, LVIII, p. 91 -144. In: Sciences Géologiques. Bulletin, tome 30, n°4, 1977. Géochimie de la surface et formes du relief. p. 303
Adloff M.C., Doubinger J. et Palain C. (1974) — Contribution à la palynologie du Trias et du Lias inférieur du Portugal. «Grès de Silves» du Nord du Tage. Comm. Serv. Geol. Portugal, LVIII, p. 91 -144
No full textAunis Danièle. Adloff M.C., Doubinger J. et Palain C. (1974) — Contribution à la palynologie du Trias et du Lias inférieur du Portugal. «Grès de Silves» du Nord du Tage. Comm. Serv. Geol. Portugal, LVIII, p. 91 -144. In: Sciences Géologiques. Bulletin, tome 30, n°4, 1977. Géochimie de la surface et formes du relief. p. 303
Charged Particle Cross Sections in Photoproduction and Extraction of the Gluon Density in the Photon
No full textPhotoproduction data collected with the H1 detector at HERA in 1994 are used to study the cross-sections for inclusive charged particle production and the structure of the photon. The differential cross-sections doe=dp 2 T ; for jjj ! 1 in the HERA laboratory frame, and doe=dj for p T ? 2 GeV/c and p T ? 3 GeV/c have been measured. Model calculations of these cross-sections, based on perturbative QCD, indicate that the results are sensitive to the parton densities of the photon as well as to higher order effects, which are phenomenologically treated by multiple interactions. This sensitivity is exploited to determine the leading order x fl distribution of partons in the photon using a new method based on high p T charged particles. The gluon content of the photon is extracted and found to rise with decreasing x fl . Submitted to Eur. Phys. J. H1 Collaboration C. Adloff 34 , M. Anderson 22 , V. Andreev 25 , B. Andrieu 28 , V. Arkadov 35 , C. Arndt 11 , I. Ayyaz 29 , A..
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