arXiv subjects

Eckhard von Toerne

Publications and source records attributed to Eckhard von Toerne.

4 recordsLinked to original sources

arXiv2007

Calorimeter Assisted Tracking Algorithm for SiD

Calorimeter-assisted track finding algorithm takes advantage of the finely segmented electromagnetic calorimeter proposed for the SiD detector concept by looking for "MIP stubs" produced by charged particles in the calorimeter, and using them as seeds for pattern recognition in the tracker. The algorithm allows for efficient reconstruction of tracks that cannot be found using seeds provided by the vertex detector, even if standalone pattern recognition in the outer tracker is difficult. The algorithm has been implemented as a package in the org.lcsim framework. Current status of the package and its performance in non-prompt tracks reconstruction are described.

physics.ins-det↗

arXiv2005

Neutrino Mass Limit from Galaxy Cluster Number Density Evolution

Measurements of the evolution with redshift of the number density of massive galaxy clusters are used to constrain the energy density of massive neutrinos and so the sum of neutrino masses $\sum m_ν$. We consider a spatially-flat cosmological model with cosmological constant, cold dark matter, baryonic matter, and massive neutrinos. Accounting for the uncertainties in the measurements of the relevant cosmological parameters we obtain a limit of $\sum m_ν$ $<$ 2.4 eV (95 % C.L.).

astro-ph↗

arXiv2003

Recent B physics results from CLEO

The CLEO detector is located at the CESR e+e- collider in Ithaca, NY. CLEO's wide range of experimental measurements in b-hadron decays is represented by improved measurements of Vcb and Vub, rare B decays, and bb-bar spectroscopy. New experimental results in exclusive hadronic transitions will aid theorists in developing a theory of hadronic B decays. Such a theory will have consequences for the extraction of angles of the unitarity triangle, especially gamma. Recently, the CLEO collaboration has shifted its focus towards precision measurements at lower energies. Based on the new Y(3S) data, we present the observation of a new bound bb-bar state. An outlook on the planned running at tau/charm-energies (CLEO-c) is given and implications for b-physics are discussed.

hep-ex↗

arXiv2001

Rare and Hadronic B decays with CLEO

Based on the CLEO II and II.5 data sets CLEO has observed several new rare and hadronic B decays and also updated the b->s+gamma measurement.

hep-ex↗