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Träfflista för sökning "(WFRF:(Ibrahim Z. A.)) srt2:(2005-2009)"

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1.	Aaron, F. D., et al. (author) Multi-leptons with high transverse momentum at HERA 2009 In: Journal of High Energy Physics. - : Springer Science and Business Media LLC. - 1029-8479. ; :10 Journal article (peer-reviewed)abstract Events with at least two high transverse momentum leptons (electrons or muons) are studied using the H1 and ZEUS detectors at HERA with an integrated luminosity of 0.94 fb(-1). The observed numbers of events are in general agreement with the Standard Model predictions. Seven di- and tri-lepton events are observed in e(+)p collision data with a scalar sum of the lepton transverse momenta above 100 GeV while 1.94 +/- 0.17 events are expected. Such events are not observed in e(-)p collisions for which 1.19 +/- 0.12 are predicted. Total visible and differential di-electron and di-muon photoproduction cross sections are extracted in a restricted phase space dominated by photon-photon collisions.
2.	Kelly, J. J., et al. (author) Recoil polarization measurements for neutral pion electroproduction at Q(2)=1(GeV/c)(2) near the Delta resonance 2007 In: Physical Review C (Nuclear Physics). - 0556-2813. ; 75:2 Journal article (peer-reviewed)abstract We measured angular distributions of differential cross section, beam analyzing power, and recoil polarization for neutral pion electroproduction at Q(2)=1.0 (GeV/c)(2) in 10 bins of 1.17 <= W <= 1.35 GeV across the Delta resonance. A total of 16 independent response functions were extracted, of which 12 were observed for the first time. Comparisons with recent model calculations show that response functions governed by real parts of interference products are determined relatively well near the physical mass, W=M-Delta approximate to 1.232 GeV, but the variation among models is large for response functions governed by imaginary parts, and for both types of response functions, the variation increases rapidly with W > M-Delta. We performed a multipole analysis that adjusts suitable subsets of center dot(pi)<= 2 amplitudes with higher partial waves constrained by baseline models. This analysis provides both real and imaginary parts. The fitted multipole amplitudes are nearly model independent-there is very little sensitivity to the choice of baseline model or truncation scheme. By contrast, truncation errors in the traditional Legendre analysis of N ->Delta quadrupole ratios are not negligible. Parabolic fits to the W dependence around M-Delta for the multiple analysis gives values for Re(S1+/M1+)=(-6.61 +/- 0.18)% and Re(E1+/M1+)=(-2.87 +/- 0.19)% for the p pi(0) channel at W=1.232 GeV and Q(2)=1.0 (GeV/c)(2) that are distinctly larger than those from the Legendre analysis of the same data. Similarly, the multipole analysis gives Re(S0+/M1+)=(+7.1 +/- 0.8)% at W=1.232 GeV, consistent with recent models, while the traditional Legendre analysis gives the opposite sign because its truncation errors are quite severe.
3.	Stanoiu, M., et al. (author) Disappearance of the N=14 shell gap in the carbon isotopic chain 2008 In: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 78:3 Journal article (peer-reviewed)abstract The structure of C-17-20(6) nuclei was investigated by means of the in-beam gamma-ray spectroscopy technique using fragmentation reactions of radioactive beams. Based on particle-gamma and particle-gamma gamma coincidence data, level schemes are constructed for the neutron-rich C17-20 nuclei. The systematics of the first excited 2(+) states in the carbon isotopes is extended for the first time to A = 20 showing that in contrast to the case of the oxygen isotopes, the N = 14 subshell closure disappears. Experimental results are compared with shell-model calculations. Agreement between them is found only if a reduced neutron-neutron effective interaction is used. Implications of this reduced interaction in some properties of weakly bound neutron-rich Carbon are discussed.

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Type of publication: journal article (3)

Type of content: peer-reviewed (3)

Author/Editor: Abramowicz, H. (1); Antonov, A. (1); Barreiro, F. (1); Bellagamba, L. (1); Bindi, M. (1); Bold, T. (1); show more...; Boscherini, D. (1); Bracinik, J. (1); Brandt, G. (1); Brock, I. (1); Bruncko, D. (1); Bruni, A. (1); Bruni, G. (1); Butterworth, J. M. (1); Capua, M. (1); Cerny, K. (1); Chekanov, S. (1); Cooper-Sarkar, A. M. (1); Corradi, M. (1); Corriveau, F. (1); Del Peso, J. (1); Dolgoshein, B. A. (1); Doyle, A. T. (1); Ferrando, J. (1); Gladilin, L. K. (1); Glasman, C. (1); Glazov, A. (1); Grabowska-Bold, I. (1); Gwenlan, C. (1); Henderson, R. C. W. (1); Hoffmann, D. (1); Iacobucci, G. (1); Iodice, M. (1); Ishitsuka, M. (1); Katzy, J. (1); Kisielewska, D. (1); Klein, M. (1); Klein, U. (1); Koffeman, E. (1); Krasznahorkay, A. (1); Kretzschmar, J. (1); Kuze, M. (1); Landon, M. P. J. (1); Laycock, P. (1); Lisovyi, M. (1); Lobodzinska, E. (1); Mastroberardino, A. (1); Maxfield, S. J. (1); Mehta, A. (1); Meyer, J. (1); show less...

University: Lund University (2); Royal Institute of Technology (1)

Language: English (3)

Research subject (UKÄ/SCB): Natural sciences (2)

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