| 1. |
- Abelev, Betty, et al.
(author)
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Long-range angular correlations on the near and away side in p-Pb collisions at root S-NN=5.02 TeV
- 2013
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In: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. - : Elsevier BV. - 0370-2693. ; 719:1-3, s. 29-41
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Journal article (peer-reviewed)abstract
- Angular correlations between charged trigger and associated particles are measured by the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV for transverse momentum ranges within 0.5 < P-T,P-assoc < P-T,P-trig < 4 GeV/c. The correlations are measured over two units of pseudorapidity and full azimuthal angle in different intervals of event multiplicity, and expressed as associated yield per trigger particle. Two long-range ridge-like structures, one on the near side and one on the away side, are observed when the per-trigger yield obtained in low-multiplicity events is subtracted from the one in high-multiplicity events. The excess on the near-side is qualitatively similar to that recently reported by the CMS Collaboration, while the excess on the away-side is reported for the first time. The two-ridge structure projected onto azimuthal angle is quantified with the second and third Fourier coefficients as well as by near-side and away-side yields and widths. The yields on the near side and on the away side are equal within the uncertainties for all studied event multiplicity and p(T) bins, and the widths show no significant evolution with event multiplicity or p(T). These findings suggest that the near-side ridge is accompanied by an essentially identical away-side ridge. (c) 2013 CERN. Published by Elsevier B.V. All rights reserved.
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| 2. |
- Abelev, Betty, et al.
(author)
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Measurement of prompt J/psi and beauty hadron production cross sections at mid-rapidity in pp collisions at root s=7 TeV
- 2012
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In: Journal of High Energy Physics. - 1029-8479. ; :11
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Journal article (peer-reviewed)abstract
- The ALICE experiment at the LHC has studied J/psi production at mid-rapidity in pp collisions at root s = 7 TeV through its electron pair decay on a data sample corresponding to an integrated luminosity L-int = 5.6 nb(-1). The fraction of J/psi from the decay of long-lived beauty hadrons was determined for J/psi candidates with transverse momentum p(t) > 1,3 GeV/c and rapidity vertical bar y vertical bar < 0.9. The cross section for prompt J/psi mesons, i.e. directly produced J/psi and prompt decays of heavier charmonium states such as the psi(2S) and chi(c) resonances, is sigma(prompt J/psi) (p(t) > 1.3 GeV/c, vertical bar y vertical bar < 0.9) = 8.3 +/- 0.8(stat.) +/- 1.1 (syst.)(-1.4)(+1.5) (syst. pol.) mu b. The cross section for the production of b-hadrons decaying to J/psi with p(t) > 1.3 GeV/c and vertical bar y vertical bar < 0.9 is a sigma(J/psi <- hB) (p(t) > 1.3 GeV/c, vertical bar y vertical bar < 0.9) = 1.46 +/- 0.38 (stat.)(-0.32)(+0.26) (syst.) mu b. The results are compared to QCD model predictions. The shape of the p(t) and y distributions of b-quarks predicted by perturbative QCD model calculations are used to extrapolate the measured cross section to derive the b (b) over bar pair total cross section and d sigma/dy at mid-rapidity.
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| 3. |
- Abelev, Betty, et al.
(author)
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Underlying Event measurements in pp collisions at root s=0.9 and 7 TeV with the ALICE experiment at the LHC
- 2012
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In: Journal of High Energy Physics. - 1029-8479. ; :7
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Journal article (peer-reviewed)abstract
- We present measurements of Underlying Event observables in pp collisions at root s = 0 : 9 and 7 TeV. The analysis is performed as a function of the highest charged-particle transverse momentum p(T),L-T in the event. Different regions are defined with respect to the azimuthal direction of the leading (highest transverse momentum) track: Toward, Transverse and Away. The Toward and Away regions collect the fragmentation products of the hardest partonic interaction. The Transverse region is expected to be most sensitive to the Underlying Event activity. The study is performed with charged particles above three different p(T) thresholds: 0.15, 0.5 and 1.0 GeV/c. In the Transverse region we observe an increase in the multiplicity of a factor 2-3 between the lower and higher collision energies, depending on the track p(T) threshold considered. Data are compared to PYTHIA 6.4, PYTHIA 8.1 and PHOJET. On average, all models considered underestimate the multiplicity and summed p(T) in the Transverse region by about 10-30%.
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| 4. |
- Aronsson, Annika, et al.
(author)
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Antas på sämre meriter?
- 2014
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In: Uppsala Nya Tidning. - 1104-0173.
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Journal article (pop. science, debate, etc.)
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| 9. |
- Jonsson, Annika, et al.
(author)
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Afterlife - ontology and the making of continuing bonds
- 2014
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In: Book of Abstracts. Interdisciplinary conference <em>Images of Afterlife </em> October 22–24, 2014 Conference venue: Sirkkala campus, Kaivokatu 12, University of Turku.
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Conference paper (peer-reviewed)abstract
- Afterlife-ontology and the making of continuing bonds This presentation explores the co-construction of after life-ontology by mediums and people turning to mediums, particularly ontology which facilitate for the making of continuing bonds. By extension, the questions addressed taps into larger discussions about re-enchantment, spirituality and relationships with the dead, but they are at the same time related to intimacy, meaning and intelligibility. The analysis is based on in-depth interviews as well as conversations found on sites where after life-issues are discussed. Themes examined include experiences of the deceased as still present, imagery of the afterlife in terms of space, temporality, agents and agency, and perceptions of the possibilities to interact. The overall purpose of the presentation is to show how different ontological notions and on-going negotiations about how, where and why the deceased continue to exist result in variations when it comes to the enactment of continuing bonds. Continuing bonds are usually investigated as features of everyday life, most notably in the form of experiences of the dead as somehow present, but also as constituted by various memorialization practices. These bonds may be a way of preserving life as they know it for the living, but they can also fill other existential needs. Although continuing bonds have been explored in the context of mediumship and spiritualism before, the interest here taken in ontological elements such as agency, space and interaction enable for a more thorough investigation of what sort of continuing bonds can be developed. The interest in co-construction, i.e. how notions and imageries are shaped (and challenged) collectively, also adds to the analytical scope. (PhD) Annika Jonsson, Dep. of Social and Psychological Studies, Karlstad University. annika.jonsson@kau.se(Prof.) Lars Aronsson, Dep. of human geography, media and communication, Karlstad University. lars.aronsson@kau.se
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