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- Abelev, B., et al.
(författare)
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Beauty production in pp collisions at root s=2.76 TeV measured via semi-electronic decays
- 2014
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Ingår i: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. - : Elsevier BV. - 0370-2693. ; 738, s. 97-108
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Tidskriftsartikel (refereegranskat)abstract
- The ALICE Collaboration at the LHC reports measurement of the inclusive production cross section of electrons from semi-leptonic decays of beauty hadrons with rapidity |y| < 0.8 and transverse momentum 1 < p(T)< 10 GeV/c, in pp collisions at root s = 2.76 TeV. Electrons not originating from semi-electronic decay of beauty hadrons are suppressed using the impact parameter of the corresponding tracks. The production cross section of beauty decay electrons is compared to the result obtained with an alternative method which uses the distribution of the azimuthal angle between heavy-flavour decay electrons and charged hadrons. Perturbative QCD predictions agree with the measured cross section within the experimental and theoretical uncertainties. The integrated visible cross section, sigma(b -> e) = 3.47 +/- 0.40(stat)(+1.12)(-1.33)(sys) +/- 0.07(norm) mu b, was extrapolated to full phase space using Fixed Order plus Next-to-Leading Log (FONLL) calculations to obtain the total b (b) over bar production cross section, sigma(b (b) over bar) = 130 +/- 15.1(stat)(+42.1)(-49.8)(sys)(+3.4)(-3.1)(extr) +/- 2.5(norm) +/- 4.4(BR) mu b. (C) 2014 The Authors. Published by Elsevier B.V.
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| 4. |
- Nijenhuis, N, et al.
(författare)
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The Use of Audio and Video in Synchronous Computer-Supported Collaborative Writing
- 2005
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Konferensbidrag (refereegranskat)abstract
- In this study the use of audio and video and the support of common ground was investigated in the context of the planning stage in the writing process. The esearch question for this study was: “Compared to the use of an audio communication modality, how is common ground supported by a video communication modality when people are planning a document together with the use of a collaborative writing tool?” To study how common ground was supported by an audio and video communication modality, the following definition of common ground was used: For a conversation to be effective the communicators need to understand each other, that means they are noticing and hearing each other, they understand what was said and what was meant. In total 45 participants took part in this study. The task was to make an outline about Sweden. A questionnaire was used to measure the support for common ground, satisfaction with the interaction and satisfaction with the outcome. Task performance was measured with the quality of the outlines. The outlines were reviewed and sorted on quality. The results for this study show that common ground is well supported by both communication modalities, but differences in support for common ground do exist. It is argued that video supports the creation and maintenance of common ground better in complex situations, which demand intensive collaboration, especially for non-native speakers of English.
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| 6. |
- Aad, G., et al.
(författare)
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- 2011
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swepub:Mat__t (refereegranskat)
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