Wolfgang Altmannshofer
A5085822339- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- High-Energy Particle Collisions Research
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Distributed and Parallel Computing Systems
- Superconducting Materials and Applications
- Medical Imaging Techniques and Applications
- International Science and Diplomacy
- Scientific Computing and Data Management
- Astrophysics and Cosmic Phenomena
- Particle accelerators and beam dynamics
- Quality Function Deployment in Product Design
- Quantum, superfluid, helium dynamics
- Mechanical Engineering and Vibrations Research
- Laser-induced spectroscopy and plasma
- Relativity and Gravitational Theory
- Cellular Automata and Applications
- Electron and X-Ray Spectroscopy Techniques
University of California, Santa Cruz
2019-2025
Institute of Particle Physics
2024-2025
Paul Scherrer Institute
2022
University of Zurich
2022
University of Cincinnati
2016-2020
Perimeter Institute
2014-2016
Fermi National Accelerator Laboratory
2011-2014
Technical University of Munich
2007-2010
In response to the 2013 Update of European Strategy for Particle Physics, Future Circular Collider (FCC) study was launched, as an international collaboration hosted by CERN. This covers a highest-luminosity high-energy lepton collider (FCC-ee) and energy-frontier hadron (FCC-hh), which could, successively, be installed in same 100 km tunnel. The scientific capabilities integrated FCC programme would serve worldwide community throughout 21st century. also investigates LHC energy upgrade,...
We review the physics opportunities of Future Circular Collider, covering its e+e-, pp, ep and heavy ion programmes. describe measurement capabilities each FCC component, addressing study electroweak, Higgs strong interactions, top quark flavour, as well phenomena beyond Standard Model. highlight synergy complementarity different colliders, which will contribute to a uniquely coherent ambitious research programme, providing an unmatchable combination precision sensitivity new physics.
In response to the 2013 Update of European Strategy for Particle Physics (EPPSU), Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC covered an energy-frontier hadron collider (FCC-hh), highest-luminosity high-energy lepton (FCC-ee), corresponding 100 km tunnel infrastructure, well physics opportunities these two colliders, and LHC, based on FCC-hh technology. This document constitutes third volume Conceptual Design Report,...
This paper describes the physics case for a new fixed target facility at CERN SPS. The SHiP (Search Hidden Particles) experiment is intended to hunt in largely unexplored domain of very weakly interacting particles with masses below Fermi scale, inaccessible LHC experiments, and study tau neutrino physics. same proton beam setup can be used later look decays tau-leptons lepton flavour number non-conservation, $\tau\to 3\mu$ search weakly-interacting sub-GeV dark matter candidates. We discuss...
The production of a μ+ μ- pair from the scattering muon neutrino off Coulomb field nucleus, known as trident production, is subweak process that has been observed in only couple experiments. As such, we show it constitutes an exquisitely sensitive probe search for new neutral currents among leptons, putting strongest constraints on well-motivated and well-hidden extensions standard model gauge group, including one coupled to difference lepton number between tau flavor, Lμ-Lτ. boson Z',...
We consider a new massive vector-boson Z' that couples to leptons through the L_mu - L_tau current, and quarks an arbitrary set of couplings. show such model can be obtained from renormalizable field theory involving heavy fermions in anomaly-free representation. The is candidate explanation for discrepancy observed recently by LHCb collaboration angular distributions final state particles rare decay B \to K* mu^+ mu^-. Interestingly, contribution tau mu nu_tau \bar nu_mu also remove small...
We present the physics program of Belle II experiment, located on intensity frontier SuperKEKB $e^+e^-$ collider. collected its first collisions in 2018, and is expected to operate for next decade. It anticipated collect 50/ab collision data over lifetime. This book outcome a joint effort collaborators theorists through theory interface platform (B2TiP), an that commenced 2014. The aim B2TiP was elucidate potential impacts program, which includes wide scope topics: B physics, charm, tau,...
We interpret the recent hints for lepton flavor universality violation in rare $B$ meson decays. Based on a model-independent effective Hamiltonian approach, we determine regions of new physics parameter space that give good description experimental data $R_K$ and $R_{K^*}$, which is tension with Standard Model predictions. suggest further measurements can help narrowing down viable explanations. stress measured values $R_{K^*}$ are fully compatible explanations other anomalies decays based...
The Circular Electron Positron Collider (CEPC) is a large international scientific facility proposed by the Chinese particle physics community to explore Higgs boson and provide critical tests of underlying fundamental principles Standard Model that might reveal new physics. CEPC, be hosted in China circular underground tunnel approximately 100 km circumference, designed operate as factory producing electron-positron collisions with center-of-mass energy 240 GeV. collider will also at around...
Following the updated measurement of lepton flavour universality (LFU) ratio R_K in B -> Kll decays by LHCb, as well a number further measurements, e.g. R_K* Belle and B_s mu ATLAS, we analyse global status new physics b s transitions weak effective theory at b-quark scale, Standard Model electroweak simplified models physics. We find that data continues to strongly prefer solution with semi-leptonic Wilson coefficients. A purely muonic contribution combination C_9 = -C_10, suited...
We present results of global fits all relevant experimental data on rare $$b \rightarrow s$$ decays. observe significant tensions between the Standard Model predictions and data. After critically reviewing possible sources theoretical uncertainties, we find that within Model, could be explained if there are unaccounted hadronic effects much larger than our estimates. Assuming uncertainties estimated in a sufficiently conservative way, discuss implications new physics, both model...
In the original version of this manuscript, an error was introduced on pp352. '2.7nb:1.6nb' has been corrected to '2.4nb:1.3nb' in current online and printed version. doi:10.1093/ptep/ptz106.
The anomalies in rare
We present a dark sector model based on gauging the $L_\mu - L_\tau$ symmetry that addresses anomalies in $b \rightarrow s \mu^+ \mu^-$ decays and features particle matter candidate. The candidate is vector-like Dirac fermion coupled to $Z^\prime$ gauge boson of $L_{\mu}-L_{\tau}$ symmetry. compute thermal relic density, its pair-annihilation cross section, loop-suppressed matter-nucleon scattering compare our predictions with current future experimental results. demonstrate after taking...
Recently, several $B$-physics experiments have reported an appreciable deviation from the Standard Model (SM) in tree-level observables $R_{D^{(*)}}$; combined weighted average now stands at $\approx 4 \sigma$. We first show anomaly necessarily implies model-independent collider signals of form $pp \to b \tau \nu$ that should be expediously searched for ATLAS/CMS as a complementary test anomaly. Next we suggest possible interconnection with radiative stability Higgs boson and point to...
In response to the 2013 Update of European Strategy for Particle Physics (EPPSU), Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC covered an energy-frontier hadron collider (FCC-hh), highest-luminosity high-energy lepton (FCC-ee), corresponding 100 km tunnel infrastructure, well physics opportunities these two colliders, and LHC, based on FCC-hh technology. This document constitutes third volume Conceptual Design Report,...
We discuss a minimal solution to the long-standing $(g-2)_\mu$ anomaly in simple extension of Standard Model with an extra $Z'$ vector boson that has only flavor off-diagonal couplings second and third generation leptons, i.e. $\mu, \tau, \nu_\mu, \nu_\tau$ their antiparticles. A simplified model realization, as well various collider low-energy constraints on this model, are discussed. find $(g-2)_\mu$-favored region for lighter than tau lepton is totally excluded, while heavier still...
A recent proposal for explaining discrepancies in angular observables the rare decay $B\ensuremath{\rightarrow}{K}^{*}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ with a gauged ${L}_{\ensuremath{\mu}}\ensuremath{-}{L}_{\ensuremath{\tau}}$ current carried it prediction of lepton flavor universality violation related $B$-meson decays. This gained empirical support subsequent hint $B\ensuremath{\rightarrow}K{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$ by LHCb. In...
Motivated by recent results the ATLAS and CMS collaborations on angular distribution of $$B \rightarrow K^* \mu ^+\mu ^-$$ decay, we perform a state-of-the-art analysis rare B meson decays based $$b s $$ transition. Using standard estimates hadronic uncertainties, confirm presence sizeable discrepancy between data SM predictions. We do not find evidence for $$q^2$$ or helicity dependence discrepancy. The can be consistently described new physics in form four-fermion contact interaction...
A bstract We provide a comprehensive model-independent analysis of rare decays involving the b → s transition to put constraints on dimension-six Δ F = 1 effective operators. The are derived from all available up-to-date experimental data B-factories, CDF and LHCb. implications future prospects for observables in sℓ + ℓ − $ s\nu \overline \nu transitions view improved measurements also investigated. present work updates generalises previous studies providing, at same time, useful tool test...