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- Abelev, Betty, et al.
(författare)
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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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Ingår i: Journal of High Energy Physics. - 1029-8479. ; :11
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Tidskriftsartikel (refereegranskat)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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- Abelev, Betty, et al.
(författare)
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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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Ingår i: Journal of High Energy Physics. - 1029-8479. ; :7
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Tidskriftsartikel (refereegranskat)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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- Avby, Gunilla
(författare)
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Evidence in practice : On knowledge use and learning in social work
- 2015
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Against the backdrop of the transformations in the entire framing of professional work, social work has come under close scrutiny in many countries, including Sweden. Doubts have been raised about practitioners’ existing knowledge base, and the importance of practitioners engaging in learning and the renewal and extension of professional capacities has been emphasized.The present thesis concerns knowledge use and learning in the daily practices of child investigation work. The aim is to explore processes of knowledge use and learning in practice. The study is based on a mix of qualitative approaches, basically from ethnography, comprising methods such as participant observations, interviews, reflective dialogues and documentary analysis of case data.The main findings demonstrate that investigation work is characterized mainly by the use of practice-based knowledge. Research-based knowledge is predominantly used as a means of explaining a client’s situation or to underpin and legitimize one’s own beliefs and decisions made on other grounds. Professional learning is largely adaptive in character, as the social workers learn to handle tasks in a fairly routinized way on the basis of rules or procedures that draw on existing knowledge in the practice setting.Two conclusions are drawn: First, the use of knowledge in child investigation work bears little resemblance to principles of evidence-based practice. Second, the reproduction of professional knowledge is largely implicit and taken for granted. The study offers insight into the much-discussed topic of putting knowledge into practice, which is of importance to strategies for organizing profes sional learning and knowledgeable practice.
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- Avby, Gunilla, et al.
(författare)
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Knowledge use and learning in everyday social work practice : A study in child investigation work
- 2017
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Ingår i: Child & Family Social Work. - : John Wiley & Sons. - 1356-7500 .- 1365-2206. ; 22:Supplement S4, s. 51-61
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to explore knowledge use and learning among social workers in everyday child investigation work. Research was undertaken in two Swedish children’s services departments. The study applied an ethnographic approach. Methods for data collection included interviews, participant observations, reflective dialogues and a documentary analysis of case files. The social workers’ knowledge sources were classified into research-based, practice-based and ordinary knowledge. The findings show that the social workers preferred practice-based knowledge, which was primarily conveyed from colleagues and previous experience, and rarely consulted knowledge from sources found outside the practice setting. Furthermore, the findings suggest that the integration of knowledge was made possible through the social workers' engagement in both a verbal and a more cognitive (tacit) reasoning activity, processes that fostered learning at work. The social workers’ learning was predominantly adaptive as they learned to handle tasks in a fairly routinized way on the basis of rules or procedures. The findings lend support to the notion that the use of different knowledge forms could potentially trigger learning in everyday social work.
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- Levin, Sara, 1974-, et al.
(författare)
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Adherence to planned risk management interventions in Swedish forensic care : What is said and done according to patient records
- 2019
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Ingår i: International Journal of Law and Psychiatry. - : Elsevier. - 0160-2527 .- 1873-6386. ; 64, s. 71-82
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Tidskriftsartikel (refereegranskat)abstract
- Both structured and unstructured clinical risk assessments within forensic care aim to prevent violence by informing risk management, but research about their preventive role is inconclusive. The aim of this study was to investigate risk management interventions that were planned and realized during forensic care by analysing patient records. Records from a forensic clinic in Sweden, covering 14 patients and 526 months, were reviewed. Eight main types of risk management interventions were evaluated by content analysis: monitoring, supervision, assessment, treatment, victim protection, acute coercion, security level and police interventions. Most planned risk management interventions were realized, both in structured and clinical risk assessments. However, most realized interventions were not planned, making them more open to subjective decisions. Analysing risk management interventions actually planned and realized in clinical settings can reveal the preventive role of structured risk assessments and how different interventions mediate violence risk.
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