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1.	Abazov, V. M., et al. (author) Direct observation of the strange b baryon Xi(-)(b) 2007 In: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 99:5, s. 052001- Journal article (peer-reviewed)abstract We report the first direct observation of the strange b baryon Xi(-)(b)(Xi) over bar (+)(b)). We reconstruct the decay Xi(-)(b)-->J/psi Xi(-), with J/psi-->mu(+)mu(-), and Xi(-)-->Lambda pi(-)-->p pi(-)pi(-) in p (p) over bar collisions at root s = 1.96 TeV. Using 1.3 fb(-1) of data collected by the D0 detector, we observe 15.2 +/- 4.4(stat)(-0.4)(+1.9)(syst) Xi(-)(b) candidates at a mass of 5.774 +/- 0.011(stat) +/- 0.015(syst) GeV. The significance of the observed signal is 5.5 sigma, equivalent to a probability of 3.3 x 10(-8) of it arising from a background fluctuation. Normalizing to the decay Lambda(b)-->J/psi Lambda, we measure the relative rate sigma(Xi(-)(b))xB(Xi(-)(b)-->J/psi Xi)/ sigma(Lambda(b))xB(Lambda(b)-->J/psi Lambda) = 0.28 +/- 0.09(stat)(-0.08)(+0.09)(syst).
2.	Abdallah, J., et al. (author) Study of double-tagged gamma gamma events at LEPII 2006 In: European Physical Journal C. Particles and Fields. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 46:3, s. 559-568 Journal article (peer-reviewed)abstract Double-tagged interactions of photons with virtualities Q(2) between 10 GeV2 and 200 GeV2 are studied with the data collected by DELPHI at LEPII from 1998 to 2000, corresponding to an integrated luminosity of 550 pb(-1). The gammagamma -> mu(+)mu(-) data agree with QED predictions. The cross-section of the reaction gammagamma -> hadrons is measured and compared to the LO and NLO BFKL calculations.
3.	Abdallah, J., et al. (author) Di-jet production in gamma gamma collisions at LEP2 2008 In: European Physical Journal C. Particles and Fields. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; C:58, s. 531-541 Journal article (peer-reviewed)

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Type of publication: journal article (3)

Type of content: peer-reviewed (3)

Author/Editor: Garcia, C. (3); Sopczak, A. (3); Wicke, D. (3); Abdallah, J (2); Hedberg, Vincent (2); Mjörnmark, Ulf (2); show more...; Smirnova, Oxana (2); Allport, P. P. (2); Andreazza, A. (2); Anjos, N. (2); Baroncelli, A. (2); Battaglia, M. (2); Benekos, N. (2); Besson, N. (2); Boonekamp, M. (2); Canale, V. (2); Chudoba, J. (2); Costa, M. J. (2); Eigen, G. (2); Elsing, M. (2); Fassouliotis, D. (2); Fuster, J. (2); Graziani, E. (2); Hamacher, K. (2); Haug, S. (2); Hoffman, J. (2); Kersevan, B. P. (2); King, B. T. (2); Kourkoumelis, C. (2); Leitner, R. (2); Liebig, W. (2); Lipniacka, A. (2); Maltezos, S. (2); Masik, J. (2); Meroni, C. (2); Moa, T. (2); Morettini, P. (2); Nicolaidou, R. (2); Onofre, A. (2); Ouraou, A. (2); Parodi, F. (2); Parzefall, U. (2); Passeri, A. (2); Salt, J. (2); Stugu, B. (2); Troncon, C. (2); Veloso, F. (2); Vrba, V. (2); Weiser, C. (2); Moenig, K. (2); show less...

University: Uppsala University (3); Lund University (2); Royal Institute of Technology (1); Stockholm University (1)

Language: English (3)

Research subject (UKÄ/SCB): Natural sciences (3)

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