[en] Momentum, track angle and impact parameter resolution are key performance parameters that tracking detectors are optimised for. This report presents analytic expressions for the resolution of these parameters for equal and equidistant tracking layers. The expressions for the contribution from position resolution are based on the Gluckstern formulae and are well established. The expressions for the contribution from multiple scattering using optimum weights are discussed in detail.

[en] This paper deals with commonly used semiconductor detector testing methods, i.e. tests with high energy beams, lasers or radioactive beta sources. The systematic effects of the tests are analysed and applicability limits are determined using measurements and simulations

[en] Future collider experiments will require tracking detectors with more precise silicon sensors for improved track reconstruction precision and possibly with the ability to provide input to the first level trigger. One way to enhance the tracking performance is the minimization of the readout pitch. We investigated the performance of such fine pitch strip sensors using multigeometry testsensors with a fixed readout pitch of 50μm and a varying number of intermediate strips and different strip widths. Results from a testbeam with 120GeV/c pions are presented, suggesting the best geometry for optimal spatial resolution. Furthermore we studied the possibility to derive the incidence angle of a particle from the cluster width, which could be used as a tracking trigger on transverse momentum.

[en] This paper briefly describes the main R and D objectives that are undertaken within the international R and D collaboration SiLC aiming to build the next generation of silicon tracking devices especially in the case of the ILC. Firstly, motivation to use silicon detectors in the tracker is explained. Then basic aspects of the design and solutions proposed are described (sensors, front-end electronics, mechanics, alignment). First results from the lab and beam test of the front-end chips and module prototypes built are shown

[en] The paper is based on the data of the 2009 DEPFET beam test at CERN SPS. The beam test used beams of pions and electrons with energies between 40 and 120 GeV, and the sensors tested were prototypes with thickness of 450μm and pixel pitch between 20 and 32μm. Intrinsic resolutions of the detectors are calculated by disentangling the contributions of measurement errors and multiple scattering in tracking residuals. Properties of the intrinsic resolution estimates and factors that influence them are discussed. For the DEPFET detectors in the beam test, the calculation yields intrinsic resolutions of ∼1μm, with a typical accuracy of 0.1μm. Bias scan, angle scan, and energy scan are used as example studies to show that the intrinsic resolutions are a useful tool in studies of detector properties. With sufficiently precise telescopes, detailed resolution maps can be constructed and used to study and optimize detector performance.

[en] A small set of final prototypes of the ATLAS Inner Detector silicon tracking system(Pixel Detector and SemiConductor Tracker), were used to take data during the 2004 Combined Test Beam. Data were collected from runs with beams of different flavour (electrons, pions, muons and photons) with a momentum range of 2 to 180 GeV/c. Four independent methods were used to align the silicon modules. The corrections obtained were validated using the known momenta of the beam particles and were shown to yield consistent results among the different alignment approaches. From the residual distributions, it is concluded that the precision attained in the alignment of the silicon modules is of the order of 5 mm in their most precise coordinate

[en] The KEKB machine and the Belle experiment in Tsukuba (Japan) are now undergoing an upgrade, leading to an ultimate luminosity of 8×10³⁵cm⁻²s⁻¹ in order to measure rare decays in the B system with high statistics. The previous vertex detector cannot cope with this 40-fold increase of luminosity and thus needs to be replaced. Belle II will be equipped with a two-layer Pixel Detector surrounding the beam pipe, and four layers of double-sided silicon strip sensors at higher radii than the old detector. The Silicon Vertex Detector (SVD) will have a total sensitive area of 1.13m² and 223,744 channels—twice as many as its predecessor. All silicon sensors will be made from 150 mm wafers in order to maximize their size and thus to reduce the relative contribution of the support structure. The forward part has slanted sensors of trapezoidal shape to improve the measurement precision and to minimize the amount of material as seen by particles from the vertex. Fast-shaping front-end amplifiers will be used in conjunction with an online hit time reconstruction algorithm in order to reduce the occupancy to the level of a few percent at most. A novel “Origami” chip-on-sensor scheme is used to minimize both the distance between strips and amplifier (thus reducing the electronic noise) as well as the overall material budget. This report gives an overview on the status of the Belle II SVD and its components, including sensors, front-end detector ladders, mechanics, cooling and the readout electronics

[en] We study bottomonium production in association with an η meson in e⁺e^- annihilations near the Υ(5S), at a centre-of-mass energy of √(s) = 10.866 GeV. The results are based on the 121.4 fb^-1 data sample collected by the Belle experiment at the asymmetric-energy KEKB collider. Only the η meson is reconstructed and the missing-mass spectrum of η candidates is investigated. We observe the e⁺e^- → ηΥ_J(1D) process and find evidence for the e⁺e^- → ηΥ(2S) process, while no significant signals of Υ(1S), h_b(1P), nor h_b(2P) are found. Cross sections for the studied processes are reported. (orig.)

[en] We report evidence for the charged charmed-strange baryon Ξ_c(2930)⁺ with a signal significance of 3.9σ with systematic errors included. The charged Ξ_c(2930)⁺ is found in its decay to K_S⁰Λ_c⁺ in the substructure of anti B⁰ → K⁰_SΛ_c⁺ anti Λ_c^- decays. The measured mass and width are [2942.3 ± 4.4(stat.) ± 1.5(syst.)] MeV/c² and [14.8 ± 8.8(stat.) ± 2.5(syst.)] MeV, respectively, and the product branching fraction is B(anti B⁰ → Ξ_c(2930)⁺ anti Λ_c^-) B(Ξ_c(2930)⁺ → anti K⁰Λ_c⁺) = [2.37 ± 0.51(stat.) ± 0.31(syst.)] x 10^-4. We also measure B(anti B⁰ → anti K⁰Λ_c⁺ anti Λ_c^-) = [3.99 ± 0.76(stat.) ± 0.51(syst.)] x 10^-4 with greater precision than previous experiments, and present the results of a search for the charmonium-like state Y(4660) and its spin partner, Y_η, in the Λ_c⁺ anti Λ_c^- invariant mass spectrum. No clear signals of the Y(4660) or Y_η are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. Thesemeasurements are obtained from a sample of (772 ± 11) x 10⁶ B anti B pairs collected at the Υ(4S) resonance by the Belle detector at the KEKB asymmetric energy electron-positron collider. (orig.)

[en] We report the first observation of the Ξ_c(2930)⁰ charmed-strange baryon with a significance greater than 5σ. The Ξ_c(2930)⁰ is found in its decay to K^-Λ_c⁺ in decays. The measured mass and width are [2928.9 ± 3.0(stat.)^+0.9_-12.0(syst.)] MeV/c² and [19.5 ± 8.4(stat.)^+5.9_-7.9(syst.)] MeV, respectively, and the product branching fraction is B(B^- → Ξ_c(2930)⁰ anti Λ_c^-) B(Ξ_c(2930)⁰ → K^-Λ_c⁺) = [1.73 ± 0.45(stat.) ± 0.21(syst.)] x 10^-4. We also measure B(B^- → K^-Λ_c⁺ anti Λ_c^-) = [4.80 ± 0.43(stat.) ± 0.60(syst.)] x 10^-4 with improved precision, and search for the charmonium-like state Y(4660) and its spin partner, Y_η, in the Λ_c⁺ anti Λ_c^- invariant mass spectrum. No clear signals of the Y(4660) nor its spin partner are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of (772� ± 11) � x 10⁶ B anti B pairs collected at the Υ(4S) resonance by the Belle detector at the KEKB asymmetric energy electron.positron collider. (orig.)