Scientific Peer-reviewed Publications
Impact of warped extra dimensions on the dipole coefficients in b to s gamma transitions
R. Malm, M. Neubert, C. Schmell
[JHEP 04, 042 (2016)] [arXiv: 1509.02539 [hep-ph]]
We calculate the electro- and chromomagnetic dipole coefficients in the context of the minimal Randall-Sundrum model with a Higgs sector localized on the IR brane using the five-dimensional approach, where the coefficients are expressed in terms of integrals over 5D propagators.
R. Malm, M. Neubert, C. Schmell
[JHEP 04, 042 (2016)] [arXiv: 1509.02539 [hep-ph]]
We calculate the electro- and chromomagnetic dipole coefficients in the context of the minimal Randall-Sundrum model with a Higgs sector localized on the IR brane using the five-dimensional approach, where the coefficients are expressed in terms of integrals over 5D propagators.
Higgs Couplings and Phenomenology in a Warped Extra Dimension
R. Malm, M. Neubert, C. Schmell,
[JHEP 02, 008 (2015)] [arXiv: 1408.4456 [hep-ph]]
We present a comprehensive description of the Higgs-boson couplings to Standard Model fermions and bosons in Randall-Sundrum (RS) models with a Higgs sector localized on or near the infra-red brane.
R. Malm, M. Neubert, C. Schmell,
[JHEP 02, 008 (2015)] [arXiv: 1408.4456 [hep-ph]]
We present a comprehensive description of the Higgs-boson couplings to Standard Model fermions and bosons in Randall-Sundrum (RS) models with a Higgs sector localized on or near the infra-red brane.
Higgs Decay into Two Photons at the Boundary of a Warped Extra Dimension
J. Hahn, C. Hörner, R. Malm, M. Neubert, K. Novotny, C. Schmell
[ Eur. Phys. J. C74, 2857 (2014)] [arXiv: 1312.5731 [hep-ph]]
A detailed five-dimensional calculation of the Higgs-boson decay into two photons is performed in both the minimal and the custodially protected Randall–Sundrum (RS) model, where the Standard Model (SM) fields propagate in the bulk and the scalar sector lives on or near the IR brane.
J. Hahn, C. Hörner, R. Malm, M. Neubert, K. Novotny, C. Schmell
[ Eur. Phys. J. C74, 2857 (2014)] [arXiv: 1312.5731 [hep-ph]]
A detailed five-dimensional calculation of the Higgs-boson decay into two photons is performed in both the minimal and the custodially protected Randall–Sundrum (RS) model, where the Standard Model (SM) fields propagate in the bulk and the scalar sector lives on or near the IR brane.
5D Perspective on Higgs Production at the Boundary of a Warped Extra Dimension
R. Malm, M. Neubert, K. Novotny, C. Schmell
[JHEP 01, 173 (2014)] [arXiv: 1303.5702 [hep-ph]]
A comprehensive, five-dimensional calculation of Higgs-boson production in gluon fusion is performed for both the minimal and the custodially protected Randall-Sundrum (RS) model, with Standard Model fields propagating in the bulk and the scalar sector confined on or near the IR brane. For the first time, an exact expression for the gg->h amplitude in terms of the five-dimensional fermion propagator is derived, which includes the full dependence on the Higgs-boson mass.
R. Malm, M. Neubert, K. Novotny, C. Schmell
[JHEP 01, 173 (2014)] [arXiv: 1303.5702 [hep-ph]]
A comprehensive, five-dimensional calculation of Higgs-boson production in gluon fusion is performed for both the minimal and the custodially protected Randall-Sundrum (RS) model, with Standard Model fields propagating in the bulk and the scalar sector confined on or near the IR brane. For the first time, an exact expression for the gg->h amplitude in terms of the five-dimensional fermion propagator is derived, which includes the full dependence on the Higgs-boson mass.
A Solution to the Flavor Problem of Warped Extra-Dimension Models
M. Bauer, R. Malm, and M. Neubert
[Phys. Rev. Lett. 108, 081603 (2012)] [arXiv: 1110.0471 [hep-ph]]
A minimal solution to the flavor problem of warped extra-dimension models, i.e. the excessive mixed-chirality contribution to CP violation in K-Kbar mixing arising from Kaluza-Klein (KK) gluon exchange, is proposed. Extending the strong-interaction gauge group in the bulk by an additional SU(3), and breaking this symmetry to QCD via boundary conditions, the constraints arising from the epsilon_K parameter are significantly relaxed.
M. Bauer, R. Malm, and M. Neubert
[Phys. Rev. Lett. 108, 081603 (2012)] [arXiv: 1110.0471 [hep-ph]]
A minimal solution to the flavor problem of warped extra-dimension models, i.e. the excessive mixed-chirality contribution to CP violation in K-Kbar mixing arising from Kaluza-Klein (KK) gluon exchange, is proposed. Extending the strong-interaction gauge group in the bulk by an additional SU(3), and breaking this symmetry to QCD via boundary conditions, the constraints arising from the epsilon_K parameter are significantly relaxed.
Doctoral thesis
-
Five-dimensional Perspective on Higgs Physics and the b to s gamma Transition in a Warped Extra Dimension [pdf]
R. Malm, Johannes-Gutenberg University Mainz, Germany
This thesis studies the Higgs-boson production and decay processes as well as the flavor-changing neutral current b to s gamma in models with one warped extra dimension, where the gauge bosons and fermions propagate into the bulk and the Higgs sector is localized on or near the infra-red brane.
Diploma thesis
-
Mitigation of the Epsilon K Fine-tuning Problem in the Randall-Sundrum Model [pdf]
R. Malm, Johannes-Gutenberg University Mainz, Germany
In order to mitigate the tension between the theoretical and the experimental value of Epsilon K within the RS framework, we will present an extension of the Minimal RS model, that will include the proposal of a new colored gauge boson as well as a first treatment of the new Higgs sector.
Selection of Talks
- Loop Processes and Higgs Phenomenology in a Warped Extra Dimension [pdf]
R. Malm, Ludwig Maximilian University of Munich - Loop Processes and Higgs Phenomenology in a Warped Extra Dimension [pdf]
R. Malm, Graduate Summer School, Frauenchiemsee in Bavaria - 5D Perspective on Higgs Production via Gluon Fusion at the Boundary of a Warped Extra Dimension [pdf]
R. Malm, Graduate School Retreat, Eberbach Abbey, Eltville - Mitigation of the Epsilon K Fine-tuning Problem in the Randall-Sundrum Model [pdf]
R. Malm, Graduate School Annual Retreat, Bad Kreuznach - Neutrinos faster than light? Theoretical aspects [pdf]
R. Malm, Johannes-Gutenberg University Mainz
Posters
- Impact of Warped Extra Dimensions on the Dipole Coefficients in b to s gamma Transitions [pdf]
R. Malm, Johannes-Gutenberg University Mainz - 5D Perspective on Higgs Production at the Boundary of a Warped Extra Dimension [pdf]
R. Malm, Johannes-Gutenberg University Mainz - Solution to the RS Flavour Problem [pdf]
R. Malm, Johannes-Gutenberg University Mainz
Lectures
- Quantum Field Theory and Theoretical Particle Physics
exercise sheets: [1] [2] [3] [4] [5] [6] [7] [8] - Modern Quantum Field Theory and Introduction to the Standard Model
exercise sheets: [1] [2] [3] [4] [5] [6] -
Higher Quantum Mechanics and Quantum Field Theory
exercise sheets: [1a] [1b] [2] [3] [4] [5] [6] [7] [8] [9]