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Electroweak oblique parameters as a probe of the trilinear Higgs boson self-interaction (2017)
Journal Article
Kribs, G. D., Maier, A., Rzehak, H., Spannowsky, M., & Waite, P. (2017). Electroweak oblique parameters as a probe of the trilinear Higgs boson self-interaction. Physical Review D, 95(9), Article 093004. https://doi.org/10.1103/physrevd.95.093004

We calculate the two-loop contributions from a modified trilinear Higgs self-interaction, κλλSMvh3, to the electroweak oblique parameters S and T. Using the current bounds on S and T from electroweak measurements, we find the 95% C.L. constraint on t... Read More about Electroweak oblique parameters as a probe of the trilinear Higgs boson self-interaction.

Prospects for new physics in τ→lμμ at current and future colliders (2017)
Journal Article
Hays, C., Mitra, M., Spannowsky, M., & Waite, P. (2017). Prospects for new physics in τ→lμμ at current and future colliders. Journal of High Energy Physics, 2017(5), Article 014. https://doi.org/10.1007/jhep05%282017%29014

The discovery of lepton flavour violating interactions will be striking evidence for physics beyond the Standard Model. Focusing on the three decays τ∓→μ±μ∓μ∓, τ∓→e±μ∓μ∓ and τ∓→e∓μ∓μ±, we evaluate the discovery potential of current and future high-en... Read More about Prospects for new physics in τ→lμμ at current and future colliders.

Boost to h→Zγ: from LHC to future e+e− colliders (2017)
Journal Article
No, J. M., & Spannowsky, M. (2017). Boost to h→Zγ: from LHC to future e+e− colliders. Physical Review D, 95(1), Article 075027. https://doi.org/10.1103/physrevd.95.075027

A precise measurement of the Higgs h→Zγ decay is very challenging at the LHC, due to the very low %SM h→Zγ(Z→ℓℓ) branching fraction and the shortage of kinematic handles to suppress the large SM Zγ background. We show how such a measurement would be... Read More about Boost to h→Zγ: from LHC to future e+e− colliders.

Type-II Seesaw Model and Multilepton Signatures at Hadron Colliders (2017)
Journal Article
Mitra, M., Niyogi, S., & Spannowsky, M. (2017). Type-II Seesaw Model and Multilepton Signatures at Hadron Colliders. Physical Review D, 95(3), Article 035042. https://doi.org/10.1103/physrevd.95.035042

We investigate multilepton signatures, arising from the decays of doubly charged and singly charged Higgs bosons in the Type II seesaw model. Depending on the vacuum expectation value of the triplet vΔ, the doubly and singly charged Higgs bosons can... Read More about Type-II Seesaw Model and Multilepton Signatures at Hadron Colliders.

Invisible decays in Higgs boson pair production (2017)
Journal Article
Banerjee, S., Batell, B., & Spannowsky, M. (2017). Invisible decays in Higgs boson pair production. Physical Review D, 95(3), Article 035009. https://doi.org/10.1103/physrevd.95.035009

Observation of Higgs pair production is an important long term objective of the LHC physics program as it will shed light on the scalar potential of the Higgs field and the nature of electroweak symmetry breaking. While numerous studies have examined... Read More about Invisible decays in Higgs boson pair production.

Quark-gluon tagging with shower deconstruction: Unearthing dark matter and Higgs couplings (2017)
Journal Article
Ferreira de Lima, D., Petrov, P., Soper, D., & Spannowsky, M. (2017). Quark-gluon tagging with shower deconstruction: Unearthing dark matter and Higgs couplings. Physical Review D, 95(3), Article 034001. https://doi.org/10.1103/physrevd.95.034001

The separation of quark and gluon initiated jets can be an important way to improve the sensitivity in searches for new physics or in measurements of Higgs boson properties. We present a simplified version of the shower deconstruction approach as a n... Read More about Quark-gluon tagging with shower deconstruction: Unearthing dark matter and Higgs couplings.

Perturbative Higgs coupling CP violation, unitarity, and phenomenology (2017)
Journal Article
Englert, C., Nordström, K., Sakurai, K., & Spannowsky, M. (2017). Perturbative Higgs coupling CP violation, unitarity, and phenomenology. Physical Review D, 95(1), Article 015018. https://doi.org/10.1103/physrevd.95.015018

Perturbative probability conservation provides a strong constraint on the presence of new interactions of the Higgs boson. In this work we consider CP-violating Higgs interactions in conjunction with unitarity constraints in the gauge-Higgs and fermi... Read More about Perturbative Higgs coupling CP violation, unitarity, and phenomenology.

Sphalerons in composite and non-standard Higgs models (2017)
Journal Article
Spannowsky, M., & Tamarit, C. (2017). Sphalerons in composite and non-standard Higgs models. Physical Review D, 95(1), Article 015006. https://doi.org/10.1103/physrevd.95.015006

After the discovery of the Higgs boson and the rather precise measurement of all electroweak boson’s masses the local structure of the electroweak symmetry breaking potential is already quite well established. However, despite being a key ingredient... Read More about Sphalerons in composite and non-standard Higgs models.

Measurement of W boson angular distributions in events with high transverse momentum jets at s√= 8 TeV using the ATLAS detector (2016)
Journal Article
Aaboud, M., Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Abeloos, B., …Zwalinski, L. (2017). Measurement of W boson angular distributions in events with high transverse momentum jets at s√= 8 TeV using the ATLAS detector. Physics Letters B, 765, 132-153. https://doi.org/10.1016/j.physletb.2016.12.005

The W boson angular distribution in events with high transverse momentum jets is measured using data collected by the ATLAS experiment from proton–proton collisions at a centre-of-mass energy s=8TeV at the Large Hadron Collider, corresponding to an i... Read More about Measurement of W boson angular distributions in events with high transverse momentum jets at s√= 8 TeV using the ATLAS detector.

Hearing the signal of dark sectors with gravitational wave detectors (2016)
Journal Article
Jaeckel, J., Khoze, V. V., & Spannowsky, M. (2016). Hearing the signal of dark sectors with gravitational wave detectors. Physical Review D, 94(10), Article 103519. https://doi.org/10.1103/physrevd.94.103519

Motivated by advanced LIGO (aLIGO)’s recent discovery of gravitational waves, we discuss signatures of new physics that could be seen at ground- and space-based interferometers. We show that a first-order phase transition in a dark sector would lead... Read More about Hearing the signal of dark sectors with gravitational wave detectors.

Jet activity as a probe of diphoton resonance production (2016)
Journal Article
Harland-Lang, L., Khoze, V., Ryskin, M., & Spannowsky, M. (2016). Jet activity as a probe of diphoton resonance production. The European Physical Journal C, 76, Article 623. https://doi.org/10.1140/epjc/s10052-016-4471-4

We explore the method of using the measured jet activity associated with a high-mass resonance state to determine the corresponding production modes. To demonstrate the potential of the approach, we consider the case of a resonance of mass MR decayin... Read More about Jet activity as a probe of diphoton resonance production.

Neutrino jets from high-mass WR gauge bosons in TeV-scale left-right symmetric models (2016)
Journal Article
Mitra, M., Ruiz, R., Scott, D. J., & Spannowsky, M. (2016). Neutrino jets from high-mass WR gauge bosons in TeV-scale left-right symmetric models. Physical Review D, 94(9), Article 095016. https://doi.org/10.1103/physrevd.94.095016

We reexamine the discovery potential at hadron colliders of high-mass right-handed (RH) gauge bosons WR—an inherent ingredient of left-right symmetric models (LRSM).We focus on the regime where theWR is very heavy compared to the heavy Majorana neutr... Read More about Neutrino jets from high-mass WR gauge bosons in TeV-scale left-right symmetric models.

LHC Signatures Of Scalar Dark Energy (2016)
Journal Article
Brax, P., Burrage, C., Englert, C., & Spannowsky, M. (2016). LHC Signatures Of Scalar Dark Energy. Physical Review D, 94(8), Article 084054. https://doi.org/10.1103/physrevd.94.084054

Scalar dark energy fields that couple to the standard model can give rise to observable signatures at the LHC. In this work, we show that t¯t þ missing energy and monojet searches are suitable probes in the limit where the dark energy scalar is stabl... Read More about LHC Signatures Of Scalar Dark Energy.

A facility to search for hidden particles at the CERN SPS: the SHiP physics case. (2016)
Journal Article
Altmannshofer, W., Asaka, T., Batell, B., Bezrukov, F., Bondarenko, K., Boyarsky, A., …Zurek, K. M. (2016). A facility to search for hidden particles at the CERN SPS: the SHiP physics case. Reports on Progress in Physics, 79(12), Article 124201. https://doi.org/10.1088/0034-4885/79/12/124201

The standard model of elementary particle physics has provided a consistent description of Nature's fundamental constituents and their interactions. Its predictions have been tested and confirmed by numerous experiments. The Large Hadron Collider's r... Read More about A facility to search for hidden particles at the CERN SPS: the SHiP physics case..

S-Channel Dark Matter Simplified Models and Unitarity (2016)
Journal Article
Englert, C., McCullough, M., & Spannowsky, M. (2016). S-Channel Dark Matter Simplified Models and Unitarity. Physics of the Dark Universe, 14, 48-56. https://doi.org/10.1016/j.dark.2016.09.002

The ultraviolet structure of -channel mediator dark matter simplified models at hadron colliders is considered. In terms of commonly studied -channel mediator simplified models it is argued that at arbitrarily high energies the perturbative descripti... Read More about S-Channel Dark Matter Simplified Models and Unitarity.

Towards resolving strongly-interacting dark sectors at colliders (2016)
Journal Article
Englert, C., Nordström, K., & Spannowsky, M. (2016). Towards resolving strongly-interacting dark sectors at colliders. Physical Review D, 94(5), Article 055028. https://doi.org/10.1103/physrevd.94.055028

Dark sectors with strong interactions have received considerable interest. Assuming the existence of a minimally coupled dark sector which runs to strong interactions in the infrared, we address the question whether the scaling behavior of this dark... Read More about Towards resolving strongly-interacting dark sectors at colliders.

Measuring rare and exclusive Higgs boson decays into light resonances (2016)
Journal Article
Chisholm, A. S., Kuttimalai, S., Nikolopoulos, K., & Spannowsky, M. (2016). Measuring rare and exclusive Higgs boson decays into light resonances. The European Physical Journal C, 76(9), Article 501. https://doi.org/10.1140/epjc/s10052-016-4345-9

We evaluate the LHC’s potential of observing Higgs boson decays into light elementary or composite resonances through their hadronic decay channels. We focus on the Higgs boson production processes with the largest cross sections, pp→h pp→h and pp→h+... Read More about Measuring rare and exclusive Higgs boson decays into light resonances.

Cosmic ray air showers from sphalerons (2016)
Journal Article
Brooijmans, G., Schichtel, P., & Spannowsky, M. (2016). Cosmic ray air showers from sphalerons. Physics Letters B, 761, 213-218. https://doi.org/10.1016/j.physletb.2016.08.030

The discovery of the Higgs boson marks a key ingredient to establish the electroweak structure of the Standard Model. Its non-abelian gauge structure gives rise to, yet unobserved, non-perturbative baryon and lepton number violating processes. We pro... Read More about Cosmic ray air showers from sphalerons.

Searching for supersymmetry scalelessly (2016)
Journal Article
Schlaffer, M., Spannowsky, M., & Weiler, A. (2016). Searching for supersymmetry scalelessly. The European Physical Journal C, 76(8), Article 457. https://doi.org/10.1140/epjc/s10052-016-4299-y

In this paper we propose a scale invariant search strategy for hadronic top or bottom plus missing energy final states. We present a method which shows flat efficiencies and background rejection factors over broad ranges of parameters and masses. The... Read More about Searching for supersymmetry scalelessly.