15 research outputs found

    ATLAS detector and physics performance: Technical Design Report, 1

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    T cell receptor V beta expression in human intestine: regional variation in postnatal intestine and biased usage in fetal gut

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    A panel of T cell receptor V beta specific monoclonal antibodies was used to analyse V beta gene usage at different sites in human postnatal and fetal intestine. In normal small intestine, at a single site, different patients showed expansion of T cells expressing individual V beta s. Lamina propria and epithelial T cells from the same patient showed overlapping but not identical V beta dominance. V beta dominance was also shown in the T cells of the colonic lamina propria. Analysis of two separate regions of intestine from the same patient (5-100 cm apart) showed that T cells expressing a dominant V beta region were often present at both sites. In most patients, however, major biases in T cell V beta usage (two to 12-fold variation) were also apparent between the two sites. Analysis of V beta expression in human fetal intestine also showed considerable skewing, although the most common dominant V beta in postnatal intestine (V beta 22) was never predominant in fetal intestine. Patchy local variation in the expression of individual V beta s therefore occurs against a background of V beta dominance over large regions of the human gut. Furthermore the results from fetal gut show that factors other than luminal antigen control V beta expression in the gut

    A test of QCD based on 3-jet events from Z0 decays

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    We present a study of 43 000 3-jet events from Z0 boson decays. Both the measured jet energy distributions and the event orientation are reproduced by second order QCD. An alternative model with scalar gluons fails to describe the data.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/29222/3/0000277.pd

    ATLAS: technical proposal for a general-purpose p p experiment at the large hadron collider at CERN

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    ATLAS computing technical proposal

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    ATLAS computing technical proposal

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    ATLAS calorimeter performance

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