FeynMG: A FeynRules extension for scalar-tensor theories of gravity

Sevillano Muñoz, Sergio; Copeland, Edmund J.; Millington, Peter; Spannowsky, Michael

doi:10.1016/j.cpc.2023.109035

Computer Physics Communications

2024

DOI: 10.1016/j.cpc.2023.109035

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FeynMG: A FeynRules extension for scalar-tensor theories of gravity

Sergio Sevillano Muñoz,

Edmund J. Copeland,

Peter Millington

et al.

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2024

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Cited by 4 publications

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Scalar radiation zeros at the LHC

Englert,

Lazanu,

Millington

2024

J. High Energ. Phys.

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We consider a class of singlet scalar extensions of the Standard Model of particle physics in which the scalar couples only to off-shell states. As a result, low-order tree-level processes involving the singlet scalar vanish, providing a unique phenomenology that may allow to evade existing constraints on new singlet scalar fields. We describe search strategies for such states at the Large Hadron Collider and identify the parameter space that can be explored in the future.

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Scalar radiation zeros at the LHC

Englert,

Lazanu,

Millington

2024

J. High Energ. Phys.

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Density dependent displaced vertex signatures as a novel probe of light dark sector scalars at the LHC

Argyropoulos,

Burrage,

Englert

2024

J. Cosmol. Astropart. Phys.

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Dynamical theories of dark energy predict new degrees of freedom with particular environmental sensitivity to avoid constraints on fifth forces. We show that the similar, yet complementary multi-purpose detector setup of the ATLAS and CMS experiments provides a unique opportunity to place sensitivity on such scenarios in a narrow, yet relevant parameter range. Furthermore, our investigation gives rise to a novel phenomenological signature that the LHC experiments can pursue to exploit their complementary detector design from a BSM perspective.

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A particle's perspective on screening mechanisms

Sevillano Muñoz

2024

J. Cosmol. Astropart. Phys.

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Screening mechanisms are a natural method for suppressing long-range forces in scalar-tensor theories as they link the local background density to their strength. Focusing on Brans-Dicke theories, those including a non-minimal coupling between a scalar degree of freedom and the Ricci scalar, we study the origin of these screening mechanisms from a field theory perspective, considering the influence of the Standard Model on the mechanisms. Additionally, we further consider the role of scale symmetries on screening, demonstrating that only certain sectors, those obtaining their mass via the Higgs mechanism, contribute to screening the fifth forces. This may have significant implications for baryons, which obtain most of their mass from the gluon's binding energy. However, a definitive statement requires extending these calculations to bound states. We show that the non-minimally coupled field's interactions with the Higgs lead to an extensive region of the parameter space where screening mechanisms create spatially dependent fermion masses. We say that the field over-screens when this effect is more significant than the fifth forces suppressed by screening mechanisms, as we illustrate for the chameleon and symmetron models.

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FeynMG: A FeynRules extension for scalar-tensor theories of gravity

Cited by 4 publications

References 40 publications

Scalar radiation zeros at the LHC

Scalar radiation zeros at the LHC

Density dependent displaced vertex signatures as a novel probe of light dark sector scalars at the LHC

A particle's perspective on screening mechanisms

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