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### An overview of results from the solenoidal tracker at rhic experiment

Barnby, Lee S
Journal of Physics G: Nuclear and Particle Physics, 2008, Vol.35(4), p.044001 (7pp) [Peer Reviewed Journal]
IOPscience (IOP Publishing)
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Title: An overview of results from the solenoidal tracker at rhic experiment
Author: Barnby, Lee S
Subject: Physics;
Description: The solenoidal tracker at RHIC (STAR) is a large acceptance experiment which has recorded data from a variety of collision systems, from p+p to Au+Au, at energies up to 200 GeV per nucleon. The analysis of these data has enabled STAR to study many interesting aspects of the evolution of the system formed by a heavy-ion collision. Measurements of strange particle production will be presented addressing the dependence of strangeness production on collision geometry. Heavy flavour production, including both quarkonia and open charm, has also been investigated. A particular strength of STAR is the ability to combine various detectors enabling measurements of moderate to high- p T -triggered correlations to be made and extended to include a variety of trigger types. These reveal a coupling of the medium and the jet-like components from which it may eventually be possible to infer some characteristics of the medium.
Is part of: Journal of Physics G: Nuclear and Particle Physics, 2008, Vol.35(4), p.044001 (7pp)
Identifier: 0954-3899 (ISSN); 1361-6471 (E-ISSN); 10.1088/0954-3899/35/4/044001 (DOI)
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### Multiplicity and mean transverse momentum of proton-proton collisions at $$\sqrt{s}$$ = 900 GeV, 2.76 and 7 TeV with ALICE at the LHC

Palaha, A. S.
University of Birmingham
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Title: Multiplicity and mean transverse momentum of proton-proton collisions at $$\sqrt{s}$$ = 900 GeV, 2.76 and 7 TeV with ALICE at the LHC
Author: Palaha, A. S.
Date: 2013
Subject: Qc Physics
Description: The charged particle multiplicity is measured for inelastic and non-single-diffractive proton-proton collisions at collision energies of 900 GeV, 2760 GeV and 7000 GeV. The data analysed corresponds to an integrated luminosity of 0.152 $$\pm$$ 0.003 pb$$^{-1}$$, 1.29 $$\pm$$ 0.07 pb$$^{-1}$$ and 2.02 $$\pm$$ 0.12 pb$$^{-1}$$ for each respective collision energy. The average transverse momentum per event as a function of charged multiplicity, for tracks with transverse momentum above 150 MeV/c and 500 MeV/c, is measured for inelastic proton-proton collisions. Two methods of deconvolution were studied, and an iterative method was used to correct the multiplicity distributions. The effect of pileup on multiplicity measurements was modelled using a toy Monte Carlo. The results presented extend the previous measurements made by ALICE to more than ten times the average charged multiplicity, and are compared to results from other experiments at similar energies, and to the Monte Carlo generators Phojet and the Perugia-0 tune of Pythia. The pseudorapidity density is estimated from the multiplicity distributions, and found to agree with other experimental results. The Phojet generator reproduces well the 900 GeV multiplicity distribution, but otherwise it and Pythia both underestimate the probability of higher multiplicities. The Pythia generator reproduces well the average transverse momentum distribution for tracks above 500 MeV/c, and overestimates the lower momentum distribution, while Phojet tends to underestimate the distribution for both momentum thresholds. Evidence of the violation of KNO scaling is shown for non-single-diffractive events in a pseudorapidity interval of $$\pm$$1, but not in $$\pm$$0.5.
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### Λ and K$$^0$$$$_S$$ production in Pb-Pb and pp collisions with ALICE at the LHC

Hanratty, Luke David
University of Birmingham
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Title: Λ and K$$^0$$$$_S$$ production in Pb-Pb and pp collisions with ALICE at the LHC
Author: Hanratty, Luke David
Date: 2014
Subject: Qb Astronomy ; Qc Physics
Description: In this work, the transverse momentum spectra of Λ and K$$^0$$$$_S$$ measured with the ALICE experiment at the LHC are discussed. Measurements are presented for colliding systems of protons, at centre of mass energies 2.76 TeV and 7 TeV, and for lead ions at a centre of mass energy of 2.76 TeV per nucleon. The spectra are discussed within a theoretical framework of a thermally equilibrated, hydrodynamically evolving system, which serves to explain the shape of the spectra for p$$_T$$ 6 GeV/c jet quenching is evident, but no evidence of particle species dependance in jet quenching is observed. The Λ/K$$^0$$$$_S$$ ratio shows an enhancement for 2 < p$$_T$$ < 6 GeV/c, peaking at 1.5 for the 5% most central Pb–Pb collisions compared to 0.6 for pp. This is discussed in terms of a coalescence model. It cannot be explained purely by enhanced baryon production, but must also involve a redistribution of particles within p$$_T$$. This supports the hydrodynamical picture of hadron production. A brief comparison to the results presently available in p–Pb collisions at the LHC is also given.
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### Measurements of Lambda, Lambda-bar and K-short from Pb-Pb collisions at 158 GeV per nucleon in a large acceptance experiment

Barnby, Lee S
The British Library
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Title: Measurements of Lambda, Lambda-bar and K-short from Pb-Pb collisions at 158 GeV per nucleon in a large acceptance experiment
Author: Barnby, Lee S
Publisher: University of Birmingham
Date: 1999
Subject: Qc Physics ; Physics
Description: The main reason for studying relativistic heavy-ion collisions is to discover the phase transition from nuclear matter to the Quark-Gluon Plasma. Such a transition is predicted to occur under conditions of high temperature and density. The predicted state features deconfined quarks and gluons as the relevant degrees of freedom instead of colour-singlet hadrons. These new degrees of freedom should lead to an enhanced production of strange quarks which has directly observable consequences on the composition of the final state hadrons detected in such a collision. The NA49 experiment is able to measure hadronic production in central Pb+Pb collisions. It uses a Pb beam, of energy 158 GeV per nucleon, from the CERN SPS with a fixed Pb target. The experiment features four large tracking detectors which can measure the trajectories of charged particles. In this thesis the method of reconstructing neutral strange particles, Lambda, Lambda-bar and K-short from their charged decay products...
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### Measurements of Lambda, Lambda-bar and K-short from Pb-Pb collisions at 158 GeV per nucleon in a large acceptance experiment

Barnby, Lee
University of Birmingham
Available
Title: Measurements of Lambda, Lambda-bar and K-short from Pb-Pb collisions at 158 GeV per nucleon in a large acceptance experiment
Author: Barnby, Lee
Date: 1999
Subject: Qc Physics
Description: The main reason for studying relativistic heavy-ion collisions is to discover the phase transition from nuclear matter to the Quark-Gluon Plasma. Such a transition is predicted to occur under conditions of high temperature and density. The predicted state features deconfined quarks and gluons as the relevant degrees of freedom instead of colour-singlet hadrons. These new degrees of freedom should lead to an enhanced production of strange quarks which has directly observable consequences on the composition of the final state hadrons detected in such a collision. The NA49 experiment is able to measure hadronic production in central Pb+Pb collisions. It uses a Pb beam, of energy 158 GeV per nucleon, from the CERN SPS with a fixed Pb target. The experiment features four large tracking detectors which can measure the trajectories of charged particles. In this thesis the method of reconstructing neutral strange particles, Lambda, Lambda-bar and K-short from their charged decay products is described. The procedure for correcting the raw yields for losses due to the limited experimental acceptance and efficiency in reconstruction is explained. An estimate of some systematic errors is made. The resulting rapidity distributions, which span either side of mid-rapidity are peaked (with the possible exception of Lambda) and the transverse momentum spectra fit the Hagedorn distribution. The inverse slope parameters, T_Lambda = 274 ± 5 MeV, T_Lambda-bar = 279 ± 10 MeV and T_K = 238 ± 5 MeV are consistent with the picture of transverse flow observed in these collisions. These results are compared with other measurements.
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