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Professor Michael Spannowsky's Outputs (16)

Probing MeV to 90 GeV axion-like particles with LEP and LHC (2015)
Journal Article
Jaeckel, J., & Spannowsky, M. (2016). Probing MeV to 90 GeV axion-like particles with LEP and LHC. Physics Letters B, 753, 482-487. https://doi.org/10.1016/j.physletb.2015.12.037

Axion-like particles (ALPs), relatively light (pseudo-)scalars coupled to two gauge bosons, are a common feature of many extensions of the Standard Model. Up to now there has been a gap in the sensitivity to such particles in the MeV to 10 GeV range.... Read More about Probing MeV to 90 GeV axion-like particles with LEP and LHC.

Combining LEP and LHC to bound the Higgs Width (2015)
Journal Article
Englert, C., McCullough, M., & Spannowsky, M. (2016). Combining LEP and LHC to bound the Higgs Width. Nuclear Physics B, 902, 440-457. https://doi.org/10.1016/j.nuclphysb.2015.11.017

The correlation of on- and off-shell Higgs boson production at the LHC in gg→h⁎→ZZgg→h⁎→ZZ has been used to bound the Higgs width. We propose an alternative complementary constraint which is only possible through the combination of LEP and LHC measur... Read More about Combining LEP and LHC to bound the Higgs Width.

Probing a light CP-odd scalar in di-top-associated production at the LHC (2015)
Journal Article
Casolino, M., Farooque, T., Juste, A., Liu, T., & Spannowsky, M. (2015). Probing a light CP-odd scalar in di-top-associated production at the LHC. The European Physical Journal C, 75, Article 498. https://doi.org/10.1140/epjc/s10052-015-3708-y

CP-odd scalars are an integral part of many extensions of the Standard Model. Recently, electroweak-scale pseudoscalars have received increased attention in explaining the diffuse gamma-ray excess from the Galactic Centre. Elusive due to absence of d... Read More about Probing a light CP-odd scalar in di-top-associated production at the LHC.

Spectroscopy of scalar mediators to dark matter at the LHC and at 100 TeV (2015)
Journal Article
Khoze, V. V., Ro, G., & Spannowsky, M. (2015). Spectroscopy of scalar mediators to dark matter at the LHC and at 100 TeV. Physical Review D, 92(7), Article 075006. https://doi.org/10.1103/physrevd.92.075006

We investigate simplified models of dark matter with scalar mediators at hadron colliders using the final state topology with two jets and missing energy. These models can arise in a wide variety of BSM scenarios including the possibility of the medi... Read More about Spectroscopy of scalar mediators to dark matter at the LHC and at 100 TeV.

Augmenting the diboson excess for the LHC Run II (2015)
Journal Article
Gonçalves, D., Krauss, F., & Spannowsky, M. (2015). Augmenting the diboson excess for the LHC Run II. Physical Review D, 92(5), https://doi.org/10.1103/physrevd.92.053010

The ATLAS collaboration recently reported an excess of events in the high invariant mass tail of reconstructed diboson events. We investigate their analysis and point to possible subtleties and improvements in the jet substructure implementation and... Read More about Augmenting the diboson excess for the LHC Run II.

Towards an Understanding of the Correlations in Jet Substructure (2015)
Journal Article
Adams, D., Arce, A., Asquith, L., Backovic, M., Barillari, T., Berta, P., …Young, C. (2015). Towards an Understanding of the Correlations in Jet Substructure. The European Physical Journal C, 75(9), Article 409. https://doi.org/10.1140/epjc/s10052-015-3587-2

Over the past decade, a large number of jet substructure observables have been proposed in the literature, and explored at the LHC experiments. Such observables attempt to utilize the internal structure of jets in order to distinguish those initiated... Read More about Towards an Understanding of the Correlations in Jet Substructure.

hhjj production at the LHC (2015)
Journal Article
Dolan, M. J., Englert, C., Greiner, N., Nordstrom, K., & Spannowsky, M. (2015). hhjj production at the LHC. The European Physical Journal C, 75(8), Article 387. https://doi.org/10.1140/epjc/s10052-015-3622-3

The search for di-Higgs production at the LHC in order to set limits on the Higgs trilinear coupling and constraints on new physics is one of the main motivations for the LHC high-luminosity phase. Recent experimental analyses suggest that such analy... Read More about hhjj production at the LHC.

Unitarity-controlled resonances after the Higgs boson discovery (2015)
Journal Article
Englert, C., Harris, P., Spannowsky, M., & Takeuchi, M. (2015). Unitarity-controlled resonances after the Higgs boson discovery. Physical Review D, 92(1), Article 013003. https://doi.org/10.1103/physrevd.92.013003

If the recently discovered Higgs boson’s couplings deviate from the Standard Model expectation, we may anticipate new resonant physics in the weak boson fusion channels resulting from high scale unitarity sum rules of longitudinal gauge boson scatter... Read More about Unitarity-controlled resonances after the Higgs boson discovery.

Signs of Tops from Highly Mixed Stops (2015)
Journal Article
Backović, M., Mariotti, A., & Spannowsky, M. (2015). Signs of Tops from Highly Mixed Stops. Journal of High Energy Physics, 2015(06), Article 122. https://doi.org/10.1007/jhep06%282015%29122

Supersymmetric extensions of the Standard Model with highly mixed squark flavours beyond minimal flavour violation provide interesting scenarios of new physics, which have so far received limited attention. We propose a calculable realization of such... Read More about Signs of Tops from Highly Mixed Stops.

Off-Shell Higgs Coupling Measurements in BSM scenarios (2015)
Journal Article
Englert, C., Soteq, Y., & Spannowsky, M. (2015). Off-Shell Higgs Coupling Measurements in BSM scenarios. Journal of High Energy Physics, 2015(05), Article 145. https://doi.org/10.1007/jhep05%282015%29145

Proposals of measuring the off-shell Higgs contributions and first measurements at the LHC have electrified the Higgs phenomenology community for two reasons: firstly, probing interactions at high invariant masses and momentum transfers is intrinsica... Read More about Off-Shell Higgs Coupling Measurements in BSM scenarios.

On-shell interference effects in Higgs boson final states (2015)
Journal Article
Englert, C., Low, I., & Spannowsky, M. (2015). On-shell interference effects in Higgs boson final states. Physical Review D, 91(7), Article 074029. https://doi.org/10.1103/physrevd.91.074029

Top quark loops in Higgs production via gluon fusion at large invariant final state masses can induce important interference effects in searches for additional Higgs bosons as predicted in, e.g., Higgs portal scenarios and the minimal supersymmetric... Read More about On-shell interference effects in Higgs boson final states.

Constraining Dark Sectors at Colliders: Beyond the Effective Theory Approach (2015)
Journal Article
Harris, P., Khoze, V. V., Spannowsky, M., & Williams, C. (2015). Constraining Dark Sectors at Colliders: Beyond the Effective Theory Approach. Physical Review D, 91(5), https://doi.org/10.1103/physrevd.91.055009

We outline and investigate a set of benchmark simplified models with the aim of providing a minimal simple framework for an interpretation of the existing and forthcoming searches of dark matter particles at the LHC. The simplified models we consider... Read More about Constraining Dark Sectors at Colliders: Beyond the Effective Theory Approach.

Di-Higgs phenomenology in t¯thh: The forgotten channel (2015)
Journal Article
Englert, C., Krauss, F., Spannowsky, M., & Thompson, J. (2015). Di-Higgs phenomenology in t¯thh: The forgotten channel. Physics Letters B, 743, 93-97. https://doi.org/10.1016/j.physletb.2015.02.041

Searches for multi-Higgs final states allow to constrain parameters of the SM (or extensions thereof) that directly relate to the mechanism of electroweak symmetry breaking. Multi-Higgs production cross sections, however, are small and the phenomenol... Read More about Di-Higgs phenomenology in t¯thh: The forgotten channel.

Higgs Self-Coupling Measurements at a 100 TeV Hadron Collider (2015)
Journal Article
Barr, A. J., Dolan, M. J., Englert, C., Ferreira de Lima, D. E., & Spannowsky, M. (2015). Higgs Self-Coupling Measurements at a 100 TeV Hadron Collider. Journal of High Energy Physics, 2015(02), Article 016. https://doi.org/10.1007/jhep02%282015%29016

An important physics goal of a possible next-generation high-energy hadron collider will be precision characterisation of the Higgs sector and electroweak symmetry breaking. A crucial part of understanding the nature of electroweak symmetry breaking... Read More about Higgs Self-Coupling Measurements at a 100 TeV Hadron Collider.