Skip to main content

Research Repository

Advanced Search

Dr Martin Bauer's Outputs (46)

Generalised hydrogen interactions with CINCO: a window to new physics (2024)
Journal Article
Bauer, M., Perez-Soler, J., & Shergold, J. D. (2024). Generalised hydrogen interactions with CINCO: a window to new physics. Journal of High Energy Physics, 2024(10), Article 176. https://doi.org/10.1007/jhep10%282024%29176

We present semi-analytic solutions for atomic transition rates in hydrogenic atoms induced by scalar, pseudoscalar, vector, axial-vector, and tensor interactions. Our results agree with quantum electrodynamics predictions to ~ 0.005 % precision, and... Read More about Generalised hydrogen interactions with CINCO: a window to new physics.

Fifth Forces from QCD Axions Scale Differently. (2024)
Journal Article
Bauer, M., & Rostagni, G. (2024). Fifth Forces from QCD Axions Scale Differently. Physical Review Letters, 132(10), Article 101802. https://doi.org/10.1103/PhysRevLett.132.101802

We reexamine the low-energy potential for a macroscopic fifth force generated from the exchange of two axions. The shift symmetry of the linear axion interactions leads to a potential falling off as V(r)∼1/r^{5}. We find that in the case of the QCD a... Read More about Fifth Forces from QCD Axions Scale Differently..

How to measure the spin of invisible states in e + e − → γ + X (2023)
Journal Article
Bauer, M., & Nordahl Erner, S. (2023). How to measure the spin of invisible states in e + e − → γ + X. Physical Review D, 108, Article 115013. https://doi.org/10.1103/PhysRevD.108.115013

We examine the production of an invisible state X together with a photon, eþe− → γ þ X, at electron positron colliders and present measurement strategies that can detect the spin of the invisible state as well as the underlying production mechanism,... Read More about How to measure the spin of invisible states in e + e − → γ + X.

Limits on the cosmic neutrino background (2023)
Journal Article
Bauer, M., & Shergold, J. D. (2023). Limits on the cosmic neutrino background. Journal of Cosmology and Astroparticle Physics, 2023(01), Article 003. https://doi.org/10.1088/1475-7516/2023/01/003

We present the first comprehensive discussion of constraints on the cosmic neutrino background (CνB) overdensity, including theoretical, experimental and cosmological limits for a wide range of neutrino masses and temperatures. Additionally, we calcu... Read More about Limits on the cosmic neutrino background.

Axion-Higgs portal (2023)
Journal Article
Bauer, M., Rostagni, G., & Spinner, J. (2023). Axion-Higgs portal. Physical Review D, 107(1), Article 015007. https://doi.org/10.1103/physrevd.107.015007

The phenomenology of axions and axionlike particles strongly depends on their couplings to Standard Model particles. The focus of this paper is the phenomenology of the unique dimension-six operator respecting the shift symmetry: the axion-Higgs port... Read More about Axion-Higgs portal.

Consistent Theory of Kinetic Mixing and the Higgs Low-Energy Theorem (2022)
Journal Article
Bauer, M., & Foldenauer, P. (2022). Consistent Theory of Kinetic Mixing and the Higgs Low-Energy Theorem. Physical Review Letters, 129(17), Article 171801. https://doi.org/10.1103/physrevlett.129.171801

Extensions of the standard model of particle physics with new Abelian gauge groups allow for kinetic mixing between the new gauge bosons and the hypercharge gauge boson, resulting in mixing with the photon. In many models, the mixing with the hyperch... Read More about Consistent Theory of Kinetic Mixing and the Higgs Low-Energy Theorem.

Searches for long-lived particles at the future FCC-ee (2022)
Journal Article
Verhaaren, C., Alimena, J., Bauer, M., Azzi, P., Ruiz, R., Neubert, M., Mikulenko, O., Ovchynnikov, M., Drewes, M., Klaric, J., Blondel, A., Rizzi, C., Sfyrla, A., Sharma, T., Kulkarni, S., Thamm, A., Suarez, R. G., & Rygaard, L. (2022). Searches for long-lived particles at the future FCC-ee. Frontiers in Physics, 10, 1-25. https://doi.org/10.3389/fphy.2022.967881

The electron-positron stage of the Future Circular Collider, FCC-ee, is a frontier factory for Higgs, top, electroweak, and flavour physics. It is designed to operate in a 100 km circular tunnel built at CERN, and will serve as the first step towards... Read More about Searches for long-lived particles at the future FCC-ee.

Flavor probes of axion-like particles (2022)
Journal Article
Bauer, M., Neubert, M., Renner, S., Schnubel, M., & Thamm, A. (2022). Flavor probes of axion-like particles. Journal of High Energy Physics, 2022(9), Article 56. https://doi.org/10.1007/jhep09%282022%29056

Axions and axion-like particles (ALPs) are well-motivated low-energy relics of high-energy extensions of the Standard Model (SM). We investigate the phenomenology of an ALP with flavor-changing couplings, and present a comprehensive analysis of quark... Read More about Flavor probes of axion-like particles.

Relic neutrinos at accelerator experiments (2021)
Journal Article
Bauer, M., & Shergold, J. D. (2021). Relic neutrinos at accelerator experiments. Physical Review D, 104(8), https://doi.org/10.1103/physrevd.104.083039

We present a new technique for observing low energy neutrinos with the aim of detecting the cosmic neutrino background using ion storage rings. Utilizing high energy targets exploits the quadratic increase in the neutrino capture cross section with b... Read More about Relic neutrinos at accelerator experiments.

Consistent Treatment of Axions in the Weak Chiral Lagrangian (2021)
Journal Article
Bauer, M., Neubert, M., Renner, S., Schnubel, M., & Thamm, A. (2021). Consistent Treatment of Axions in the Weak Chiral Lagrangian. Physical Review Letters, 127(8), https://doi.org/10.1103/physrevlett.127.081803

We present a consistent implementation of weak decays involving an axion or axionlike particle in the context of an effective chiral Lagrangian. We argue that previous treatments of such processes have used an incorrect representation of the flavor-c... Read More about Consistent Treatment of Axions in the Weak Chiral Lagrangian.

Flavor structure of anomaly-free hidden photon models (2021)
Journal Article
Bauer, M., Foldenauer, P., & Mosny, M. (2021). Flavor structure of anomaly-free hidden photon models. Physical Review D, 103(7), Article 075024. https://doi.org/10.1103/physrevd.103.075024

Extensions of the Standard Model with an Abelian gauge group are constrained by gauge anomaly cancellation, so that only a limited number of possible charge assignments is allowed without the introduction of new chiral fermions. For flavor universal... Read More about Flavor structure of anomaly-free hidden photon models.

The low-energy effective theory of axions and ALPs (2021)
Journal Article
Bauer, M., Neubert, M., Renner, S., Schnubel, M., & Thamm, A. (2021). The low-energy effective theory of axions and ALPs. Journal of High Energy Physics, 2021(4), Article 63. https://doi.org/10.1007/jhep04%282021%29063

Axions and axion-like particles (ALPs) are well-motivated low-energy relics of high-energy extensions of the Standard Model, which interact with the known particles through higher-dimensional operators suppressed by the mass scale Λ of the new-physic... Read More about The low-energy effective theory of axions and ALPs.

Light dark matter annihilation and scattering in LHC detectors (2021)
Journal Article
Bauer, M., Foldenauer, P., Reimitz, P., & Plehn, T. (2021). Light dark matter annihilation and scattering in LHC detectors. SciPost Physics, 10(2), Article 030. https://doi.org/10.21468/scipostphys.10.2.030

We systematically study models with light scalar and pseudoscalar dark matter candidates and their potential signals at the LHC. First, we derive cosmological bounds on models with the Standard Model Higgs mediator and with a new weak-scale mediator.... Read More about Light dark matter annihilation and scattering in LHC detectors.

Axionlike Particles, Lepton-Flavor Violation, and a New Explanation of aμ and a (2020)
Journal Article
Bauer, M., Neubert, M., Renner, S., Schnubel, M., & Thamm, A. (2020). Axionlike Particles, Lepton-Flavor Violation, and a New Explanation of aμ and a. Physical Review Letters, 124(21), Article 211803. https://doi.org/10.1103/physrevlett.124.211803

Axionlike particles (ALPs) with lepton-flavor-violating couplings can be probed in exotic muon and tau decays. The sensitivity of different experiments depends strongly on the ALP mass and its couplings to leptons and photons. For ALPs that can be re... Read More about Axionlike Particles, Lepton-Flavor Violation, and a New Explanation of aμ and a.

Axion-Like Particles at Future Colliders (2019)
Journal Article
Bauer, M., Heiles, M., Neubert, M., & Thamm, A. (2019). Axion-Like Particles at Future Colliders. The European Physical Journal C, 79, Article 74. https://doi.org/10.1140/epjc/s10052-019-6587-9

Axion-like particles (ALPs) are pseudo Nambu–Goldstone bosons of spontaneously broken global symmetries in high-energy extensions of the Standard Model (SM). This makes them a prime target for future experiments aiming to discover new physics which a... Read More about Axion-Like Particles at Future Colliders.

Universal properties of pseudoscalar mediators in dark matter extensions of 2HDMs (2018)
Journal Article
Bauer, M., Klassen, M., & Tenorth, V. (2018). Universal properties of pseudoscalar mediators in dark matter extensions of 2HDMs. Journal of High Energy Physics, 07, Article 107. https://doi.org/10.1007/jhep07%282018%29107

We discuss universal signals of consistent models of pseudoscalar mediators for collider searches for Dark Matter. Keeping only the degrees of freedom that can not be decoupled due to consistency conditions, we present a universality class of simplif... Read More about Universal properties of pseudoscalar mediators in dark matter extensions of 2HDMs.

Hunting All the Hidden Photons (2018)
Journal Article
Bauer, M., Foldenauer, P., & Jaeckel, J. (2018). Hunting All the Hidden Photons. Journal of High Energy Physics, 2018(07), Article 094. https://doi.org/10.1007/jhep07%282018%29094

We explore constraints on gauge bosons of a weakly coupled U(1)B−L, U(1)Lµ−Le , U(1)Le−Lτ and U(1)Lµ−Lτ . To do so we apply the full constraining power of experimental bounds derived for a hidden photon of a secluded U(1)X and translate them to the c... Read More about Hunting All the Hidden Photons.

Higgs Pair Production as a Signal of Enhanced Yukawa Couplings (2018)
Journal Article
Bauer, M., Carena, M., & Carmona, A. (2018). Higgs Pair Production as a Signal of Enhanced Yukawa Couplings. Physical Review Letters, 121(2), Article 021801. https://doi.org/10.1103/physrevlett.121.021801

We present a nontrivial correlation between the enhancement of the Higgs-fermion couplings and the Higgs pair production cross section in two Higgs doublet models with a flavor symmetry, with implications for LHC searches. This symmetry suppresses fl... Read More about Higgs Pair Production as a Signal of Enhanced Yukawa Couplings.