Measurements of very-forward energy with the CASTOR calorimeter of CMS

The very-forward energy production in hadron collisions is of paramount importance for the understanding of ultra-high energy cosmic ray air showers. The CASTOR calorimeter of CMS is located at $-6.6 < \eta < -5.2$ in the phase-space where the peak of energy is deposited at LHC. The composition and characteristics of the particles in this phase-space have a determining impact on the formation of air shower cascades. An overview of various energy measurements performed with CASTOR is reported and possible implications for cosmic ray physics are outlined.Comment: Proceeding to ISVHECRI 2018, Nagoy

Measurement of the very forward energy in proton-proton collisions at 13 TeV with the CMS experiment and implications for hadronic interaction models

The very forward calorimeter of the CMS experiment CASTOR measures the largest energy densities accessible at the LHC and is a unique tool to study soft multiparticle production relevant for the underlying event and air shower development. Within this work, the very forward collision energy is measured in proton-proton collisions at 13 TeV. The results are given in terms of the differential production cross section and as a function of the charged particle multiplicity at central rapidity. The data are furthermore used to derive implications on hadronic interaction models

Dark matter searches with the IceCube Upgrade

Weakly Interacting Massive Particles (WIMPs) are well-motivated candidates for Dark Matter (DM). WIMP models often include self-annihilation into Standard Model particles such as neutrinos which could potentially be detected by the IceCube Neutrino Observatory. Various searches for a dark matter induced signal have been performed with the existing IceCube detector. However, since there is so far no evidence for WIMPs at TeV scales, more attention is brought to DM candidates at GeV masses, for which the IceCube detector is not sensitive due to its energy threshold. The IceCube collaboration is currently preparing the construction of the IceCube Upgrade which is planned to be deployed in the 2022/2023 South Pole summer season. The IceCube Upgrade will consist of 7 new in-ice strings with about 700 additional optical sensors. This dense sensor array inside the IceCube-DeepCore volume will enhance the reconstruction capability of few-GeV neutrinos. We present first studies on the potential improvements of this upgrade on IceCube's sensitivity to Dark Matter annihilating in the Galactic Center.Comment: Presented at the 36th International Cosmic Ray Conference (ICRC 2019). See arXiv:1907.11699 for all IceCube contribution

Erschließung von Crowd Data und Verknüpfung mit Befragungsdaten im Bereich Verkehr

Dieser Beitrag illustriert, wie durch die Verknüpfung von alternativen mit konventionellen Daten, wertvolle Erkenntnisse für die strategische Steuerung in Städten gewonnen werden können. Hierfür werden zuerst die Stärken und Limitierungen von OpenStreetMap-Daten als alternative Datenquelle, insbesondere in Bezug auf Radwege, diskutiert. Anschließend wird auf die konkrete Erschließung und Berechnung der Radwegenetze über OpenStreetMap eingegangen. Diese Daten werden mit Befragungsdaten verknüpft und mittels logistischer Regression analysiert. Im Mittelpunkt steht dabei die Forschungsfrage welche Faktoren die Wahl des bevorzugten Verkehrsmittels von Bürgerinnen und Bürgern, im konkreten Fall das Fahrrad, beeinflussen

Inelastic Diffraction at Heavy Ion Colliders

The heavy ion physics approach to global event characterization has led us to instrument the forward region in the PHENIX experiment at RHIC. In heavy ion collisions this coverage yields a measurement of the "spectator" energy and its distribution about the beam direction. This energy flow is the basis of event-by-event determination of the centrality and reaction plane which are key to analyzing particle production in heavy ion collisions. These same tools have also enabled a unique set of measurements on inelastic diffraction with proton, deuteron and gold ion beams in the PHENIX experiment. We present first new results on this topic and discuss briefly the opportunity for diffractive physics with Heavy Ion beams at the LHC.Comment: RHIC overview talk presented at "Diffraction 2004" in Dorgali, Sardegna, Ital

Predicting high-dimensional heterogeneous time series employing generalized local states

We generalize the concept of local states (LS) for the prediction of high-dimensional, potentially mixed chaotic systems. The construction of generalized local states (GLS) relies on defining distances between time series on the basis of their (non-)linear correlations. We demonstrate the prediction capabilities of our approach based on the reservoir computing (RC) paradigm using the Kuramoto-Sivashinsky (KS), the Lorenz-96 (L96), and a combination of both systems. In the mixed system a separation of the time series belonging to the two different systems is made possible with GLS. More importantly, prediction remains possible with GLS, where the LS approach must naturally fail. Applications for the prediction of very heterogeneous time series with GLSs are briefly outlined

Collective hadronization and air showers: can LHCdata solve the muon puzzle ?

International audienceThe deficit of muons in the simulation of extensive air showers is a long standing problem and the origin of large uncertainties in the reconstruction of the mass of the high energy primary cosmic rays. Hadronic interaction models re-tuned after early LHC data have a more consistent description of the muon content among them but still disagree with data. Collective hadronization due to the formation of a quark gluon plasma (QGP) has already been studied as a possible reason for a larger production of muons under extreme conditions (rare, very central nuclear interactions), but without real success. Because of its different ratio of electromagnetic to hadronic energy, a QGP may have the properties to solve the muon puzzle in particular in the view of the most recent LHC data. It is demonstrated using a theoretical approach and tested in a realistic way by the modification of the EPOS model to produce a QGP also in not so extreme conditions with a possible large impact on air shower physics