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The CHIPP/CHART Workshop on Sustainability in Particle Physics will be held in Sursee. We will bring together several communities : CHIPP, CHART, and those interested in sustainability to one three-day workshop.
We encourage registration for all 3 days, however, 2-day registrations are possible.
The program is:
Wed. 14.06: Focus on sustainability in particle physics
Thu. 15.06: Joint CHIPP/CHART sessions and excursion on sustainability, CHIPP Board 2023-02
Fri. 16.06: CHIPP Plenary 2023, ECR flash talks and poster prize
Arrival & parking
By car
Motorway exit Sursee in the direction of Huttwil/Willisau. Follow the signposts towards CAMPUS SURSEE. If using satellite navigation, enter "Leidenbergstrasse 17, 6208 Oberkirch" as the destination. Approximately 1100 fee-based parking spaces are available (outdoor or multi-storey car park). The parking fee of CHF 5 per day per vehicle is to be paid individually. Please advise your guests in advance to use car park P3, P4 or P5. In the other car parks (P6 & P7), the short-term parking fee of CHF 1/hour applies.
By public transport
Take the train to Sursee train station. Take the postbus to the CAMPUS SURSEE stop.
Or on foot: Behind the train station, directly after the train station underpass, towards the left there is a pleasant footpath that leads directly to CAMPUS SURSEE (approximately 15 minutes' walk).
Goal: Define sustainable development goals for particle and accelerator physics research in Switzerland (correlate with sustainable development goals)
Goal: Define sustainable development goals for particle and accelerator physics research in Switzerland (correlate with sustainable development goals)
The FCC-ee is a proposed future e$^+$e$^-$ collider capable of producing all SM particles in large quantities and clean experimental conditions. Up to four experiments can detect the collision products, with IDEA being one of the proposed detector concepts at FCC-ee. IDEA needs to fulfil requirements similar to experiments at other proposed lepton colliders such as reliable particle identification, efficient flavour tagging and superior momentum resolution.
This contribution presents the progress of the implementation of the IDEA detector in full simulation using the key4hep and DD4hep framework used by many future collider communities.
An emphasis will be put on the design and full simulation implementation of the vertex detector which is crucial for many of the experimental goals of the FCC-ee program. The related R&D on DMAPS will be briefly discussed as well.
For the High-Luminosity phase of the LHC (HL-LHC) the ATLAS detector will undergo a series of upgrades to cope with the increased number of proton interactions and harsher radiation environment. One of the key projects in this suite of upgrades is the ATLAS Inner Tracker (ITk) and its pixel detector, which will have unprecedented granularity and number of channels, that require extreme bandwidth of O(100 TB) for data readout. In this talk we present the so-called Optosystem, which performs the electrical-to-optical conversion of signals from the pixel modules. The key components, the Optoboards are housed in Optoboxes contained in 8 Optopanels located on the ITk endplates. The system is entirely designed and build in Bern. We show the design, testing and production of the system and recent results related to the performance tests of prototypes operating in a full data transmission chain.
The LEMING experiment at the Paul Scherrer institute aims to measure the free fall of muonium (M $= \mu^+ + e^-$), an exotic atom consisting purely of leptons. Measuring the free fall of M would be the first test of the weak equivalence principle using elementary antimatter of the second generation and using a system without large hadronic contributions to its mass.
Such a direct measurement is performed by atom interferometry, which requires a high intensity, low emittance M beam. We are developing a novel M source based on stopping accelerator muons in a layer of superfluid helium at cryogenic temperatures.
In this contribution, results from the first observation of M emitted from superfluid helium are presented. An initial characterization of the M source shows a high vacuum M yield and sub-thermal beam dynamics. Prospects of this novel beam in the context of a free fall experiment will be discussed.
The first search for the Z boson decay to $\tau\tau\mu\mu$ is presented. The data analyzed were collected by the CMS experiment at the CERN LHC in proton-proton collisions at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 138 $\mathrm {fb^{−1}}$. Targeting tau lepton decays to muons and the corresponding
neutrinos, events with two pairs of oppositely charged muons are analyzed. The data are found to be compatible with the predicted background. An upper limit of 6.9 times the standard model expectation is placed on the ratio of event yields from the $\mathrm{Z}\to\tau\tau\mu\mu$ and $\mathrm{Z}\to\mu\mu\mu\mu$ decays, which corresponds to an upper limit on the ratio of branching fractions of these decay modes of 6.2.
Introduction to PIONEER, a next generation rare pion decay experiment located at PSI.
The LEMING (LEptons in Muonium INteracting with Gravity) experiment aims to measure the gravitational acceleration of Muonium (M = e$^−$ + $\mu^+$ ) in the gravitational field of the earth. An essential part of this experiment is the reliable detection of M’s decay products, i.e. e$^+$ and e$^−$, at temperatures below 1$\,$K. The electron, referred to as atomic electron, can be accelerated to energies of $\mathcal{O}$(keV), thus requiring a sensitive detector. This work considers perovskite nanocrystals for the detection of the atomic electron. Preliminary tests at room and cryogenic temperatures are presented.
Beyond the minimal kinetically-mixed dark photon scenarios predicting fully visible and fully invisible mediator decays, next-to-minimal theories have been considered as compelling frameworks for thermal dark matter and some low-energy anomalies, as the muon g-2.
This talk will showcase the potential of the NA64 experiment in the exploration of rich dark sectors in which the dark photon is semi-visible. The NA64 invisible results have been re-interpreted in the context of two inelastic dark matter models to account for the different signal signature, entailing both missing energy and visible final states.
NA64 is a fixed-target frontier experiment running at the CERN SPS. NA64 searches for possible candidates of mediators between the dark sector and the standard model by looking for missing energy events in an active beam dump. After resuming data taking in 2021, NA64 has tripled its statistics, allowing us to set leading constraints to dark sector mediators in the light dark matter parameter space. This talk will focus on the latest results from the analysis of the 2021-2022 data as well as the current status of the experiment.
We present performance tests of the ATLAS Phase-II Outer Barrel Pixel detector services chains. The Phase-II pixel upgrade is part of the ITk HL-LHC upgrades to be installed later in this decade. After successful completion of the design phase, the final components are undergoing production and integration testing. A full data transmission chain is set up at the University of Bern for ITk that goes from the pixel sensors all the way to the FELIX backend data acquisition system. We present studies of data transmission involving different configurations and optimizations of data routes. Challenges and results of the services chain of the Outer Barrel will be highlighted.
We present the first observation of $\tau$ lepton pair production in ultraperipheral nucleus-nucleus collisions. The measurement is based on a data sample collected by the CMS experiment at a per nucleon center-of-mass energy of $5.02~\mathrm{TeV}$, and corresponding to an integrated luminosity of $404~\mu\mathrm{b}^{-1}$. The $\gamma\gamma\to\tau^{+}\tau^{-}$ production is observed with a statistical significance of at least five standard deviations for $\tau^{+}\tau^{-}$ events with a muon and three charged hadrons in the final state. The cross section is measured in a fiducial phase space region and is found to be $\sigma(\gamma\gamma\to\tau^{+}\tau^{-}) = 4.8\pm 0.6\,(\mathrm{stat})\pm 0.5\,(\mathrm{syst})~\mu\mathrm{b}$, in agreement with leading-order QED predictions. The measurement, based on a small fraction of the expected integrated luminosity of the LHC nuclear program, establishes the potential for an ongoing analysis with substantially more precise determination of the anomalous magnetic moment of the $\tau$ lepton.
In the light of the current hints for new scalars at the LHC at 95 GeV and 151 GeV, I present an analysis of low mass resonances decaying into W bosons. Recasting and combining the SM Higgs analyses of ATLAS and CMS, our results give further support to the existance of such new Higgs bosons.
The work is based on the paper: e-Print:2302.07276 [hep-ph]
I discuss the two-Higgs doublet model extended by a complex singlet and an additional U(1) gauge group (N2HDM-U(1)) and compare it to the standard two-Higgs doublet model with Z2 symmetries (N2HDM-Z2). We show that the N2HDM-U(1) is more predictive as it has one less free parameter, is CP conserving, and involves only spontaneous symmetry breaking. We then examine the phenomenological consequences for the Large Hadron Collider. In particular, we find that a sizable branching ratio of scalar decays to two different Higgses is possible in N2HDM-U(1), which is generally suppressed in N2HDM-Z2 for small scalar mixing. This is particularly relevant in light of the CMS excess in Higgs pair production at around 650 GeV decaying a Standard Model Higgs decaying to photons and a new scalar with a mass of ≈ 90 GeV decaying to bottom quarks.
NA62 is a fixed-target experiment at the CERN SPS dedicated to measurements of rare kaon decays. It is approved to take data until CERN long shutdown 3, with the primary goal to collect the order of 100 candidates $K^+ \rightarrow \pi^+ \nu \bar{\nu}$ events and to measure the corresponding branching ratio with the precision of the order of 10%. The experiment resumed data taking in 2021 after CERN long shutdown 2, with an upgraded beamline, a new configuration of the beam tracker (GigaTracKer), new detectors installed upstream of the decay region to intercept early kaon decays, and a renovated small angle hadronic calorimeter (HASC). The 2021 run has been devoted to commissioning both the beamline and the new detectors. The present status of NA62 is discussed.
An electric dipole moment (EDM) of a fundamental particle would violate time (T) and parity (P) symmetry and by the virtue of the CPT theorem also the combined symmetry of charge conjugation and parity inversion (CP). Searches for EDM are generally considered highly sensitive probes for new physics and might shed light on still unresolved questions in particle physics and cosmology like the origins of matter, dark matter, and dark energy.
At the Paul Scherrer Institute in Switzerland, we are setting up an experiment searching for a muon EDM with a sensitivity of 3E-21 ecm using, for the first time, the frozen-spin technique in a compact storage ring. This will lay the ground work for a second phase with a final precision of better than 6e-23 ecm.
The SoLAr detector concept, aims to extend the sensitivities of LArTPC detectors to the MeV energy range, and expands their physics reach to observe solar neutrinos and potentially supernovae neutrinos.
The core concept is centered around an integrated charge-light readout plane, consisting of pixel pads for charge collection and VUV SiPMs for direct de- tection of LAr scintillation light. The main challenges are to achieve low energy thresholds with an excellent energy resolution and successfully per- form background rejection using pulse shape discrimination.
A staged prototyping program is planned to demonstrate the technology viability of the detector concept step by step. In October 2022, a small scale SoLAr prototype was constructed and tested in LAr at Bern University. Here we present the results from the first prototype run with cosmics muons and discuss the roadmap to a ton scale demonstrator at Boulby Underground Laboratory.