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Proefschrift Universiteit van Amsterdam. / Met lit. opg. - Met samenvatting in het Nederlands.

Proefschrift Universiteit van Amsterdam. / Met lit.opg. en samenvatting in het Nederlands.

Universiẗat, Diss., 2004--Bonn.

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Attraktion avser gillandet och dragningskraften till en annan människa som kan leda till en relationsutveckling, vänskaplig som romantisk. Syftet med den här studien var att visa hur främst romantisk attraktion upplevs i det vardagliga livet. Studien utfördes med en kvalitativ forskningsmetod, med ett blandat urval i åldrarna 22-70 år. Undersökningen avser tio intervjuer som är genomförda i Mellansverige och som kan bidra med en bredare studie inom attraktionsforskning till skillnad från tidigare nischade undersökningar inom ett fåtal variabler. Analysen visade att samtliga fann det attraktivt med; 1) att bjuda på sig själv, 2) intellekt, 3) ömsesidighet och systematik i kontakten, 4) tillit, 5) likhet och komplement, 6) yttre attribut, 7) spänning samt 8) bekräftelse. Generaliserbarheten är begränsad med tanke på antal deltagare i undersökningen.

This dissertation deals with the neutrino fluxes that come from charm decays in hadronic collisions in beam dump and collider experiments. The specific focus is on the beam dump experiment SHiP (Search for Hidden Particles) and the collider experiment LHC (Large Hadron Collider). Based on the HVQMNRPHO computer program, the next-to-leading order (NLO) perturbative QCD (pQCD) calculation is performed for charm quark. Two nonperturbative effects, the initial transverse momentum and fragmentation are modeled by a Gaussian function and the Peterson fragmentation function, respectively. The parameters in these two models are determined by comparisons with the experimental data. The distributions of charm hadrons $D_s^-$, $D^-$, $D^0$ and $\Lambda_c^-$ are thus obtained. By considering the full 3-Dimensional kinematics of the charm hadron decays in the hadron rest frame and then Lorentz transforming to the lab frame, the tau neutrino and muon neutrino fluxes are obtained. The number of neutrino charged current (CC) events at the neutrino detector are evaluated for SHiP and the LHC. The NLO pQCD evaluation predicts about 300 tau neutrino and antineutrino events for SHiP which is much higher than the number of tau neutrino events observed already at OPERA (Oscillation Project with Emulsion-tRacking Apparatus) and DONuT (Direct observation of the nu tau), and thus provides the potential to study the tau neutrino interactions with high statistics. An estimate of the possible intrinsic charm production has been performed for SHiP which may make its presence in the hadron and neutrino specta. Hundreds of tau neutrino and antineutrino events per year per kilogram of lead are achievable for a very far-forward neutrino detector at the LHC.

Frankfurt (Main), University, Diss., 2008 und Université Louis Pasteur Strasbourg 1, Diss., 2008. / Erscheinungsjahr an der Haupttitelstelle: 2007.

The LHCb experiment, based at the Large Hadron Collider at CERN, is primarily designed to make precision measurements of the decays of heavy flavour hadrons, such as B and D mesons. This thesis is composed of two parts: the first consists of two studies of LHCb's vertex locator (VELO) and the second describes the development of methods for recording the decay D0->K-mu+nu_mu. The first VELO study involves calibration and monitoring of the gain (i.e. the detector response to input charge from particles). We propose a robust method to measure the gain response of each silicon sensor using calibration bits output by the sensors, and a method to recalibrate the gain simple enough to be followed by non-expert VELO users. This is followed by an investigation into into the prospects of using the VELO to perform particle identification using the characteristic energy deposition of each particle species (dE/dx). Finally, studies into the development of a trigger and a so-called 'stripping line' for recording D0->K-mu+nu_mu decays is presented. The relatively high cross-section for charm decays in LHCb mean this decay (with a branching fraction of 3%) occurs frequently, and the challenge of a trigger is to reduce this to a rate acceptable to write to disk. Finally, based on a sample of data from July and August 2011, the measured q 2 distribution for this decay is compared to the simple single-pole theoretical model, and the pole mass is measured to bem_pole=2.35 + 0.81 - 0.35 GeV/c 2.