Belén Gavela

Darkly Charged ALPs

Nicolás M. Arenaza, Enrique Fernández-Martínez, Belén Gavela, Elizabeth Jenkins et autres

The established $d=5$ ALP effective Lagrangian describes the interaction of scalars with approximate shift-symmetry which carry no Standard Model (SM) charges with SM fields. It implicitly assumes that ALPs are not charged under any symmetries of the dark sector. In this paper, …

Darkly Charged ALPs

Nicolás M. Arenaza, Enrique Fernandez-Martinez, Belén Gavela, Elizabeth Jenkins et autres

The established $d=5$ ALP effective Lagrangian describes the interaction of scalars with approximate shift-symmetry which carry no Standard Model (SM) charges with SM fields. It implicitly assumes that ALPs are not charged under any symmetries of the dark sector. In this paper, …

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Higgs near-criticality at future colliders

Víctor Enguita-Vileta, Belén Gavela, Thomas Steingasser

The so-called metastability bound on the Higgs mass suggests that the smallness of the Higgs mass may be a by-product of the metastability of the electroweak vacuum. A significantly strong bound requires new physics capable of lowering the scale where the Higgs …

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Higgs Criticality and the Metastability Bound: a target for future colliders

Maximilian Detering, Victor Enguita, Belén Gavela, Thomas Steingasser et autres

New physics at the TeV scale or lower may destabilise the electroweak vacuum. How low could the vacuum instability scale be? This fundamental question may be tied to a deeper understanding of the Higgs potential and its associated hierarchy problem. The scale …

Higgs near-criticality at future colliders

Victor Enguita, Belén Gavela, Thomas Steingasser

The so-called metastability bound on the Higgs mass suggests that the smallness of the Higgs mass may be a byproduct of the metastability of the electroweak vacuum. A significantly strong bound requires new physics capable of lowering the scale where the Higgs …

ALP contribution to the strong C P problem

Víctor Enguita-Vileta, Belén Gavela, Benjamı́n Grinstein, Pablo Quílez

We compute the one-loop contribution to the θ ¯ parameter of an faxionlike particle (ALP) with C P -odd derivative couplings. Its contribution to the neutron electric dipole moment is shown to be orders of magnitude larger than that stemming from the …

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The QCD axion sum rule

Belén Gavela, Pablo Quílez, Maria Eugênia Soares Ramos

A bstract We demonstrate that the true QCD axion that solves the strong CP problem can be found in all generality outside the customary standard QCD band, with QCD being the sole source of Peccei-Quinn breaking. The essential reason is that the …

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ALP contribution to the Strong CP problem

Victor Enguita, Belén Gavela, Benjamı́n Grinstein, Pablo Quílez

We compute the one-loop contribution to the $\barθ$-parameter of an axion-like particle (ALP) with CP-odd derivative couplings. Its contribution to the neutron electric dipole moment is shown to be orders of magnitude larger than that stemming from the one-loop ALP contributions to …

Limits on ALP-neutrino couplings from loop-level processes

J. L. Bonilla, Belén Gavela, J. Machado-Rodríguez

We obtain new bounds on effective axionlike particle (ALP)-neutrino interactions from their loop-level impact on the ALP couplings to electroweak gauge bosons γZ , ZZ and W+W− . Both types of interactions are connected via the chiral anomaly, which allows to overcome …

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The QCD axion sum rule

Belén Gavela, Pablo Quílez, Maria J. Ramos

We demonstrate that the true QCD axion that solves the strong CP problem can be found in all generality outside the customary standard QCD band, with QCD being the sole source of Peccei-Quinn breaking. The essential reason is that the basis of …

On discrete Goldstone bosons

Víctor Enguita-Vileta, Belén Gavela, R. Houtz, Pablo Quílez

Exact discrete symmetries, if non-linearly realized, can reduce the ultraviolet sensitivity of a given theory. The scalars stemming from spontaneous symmetry breaking are massive without breaking the discrete symmetry, and those masses are protected from divergent quadratic corrections. This is in contrast …

The cost of an ALP solution to the neutral B-anomalies

J. L. Bonilla, Arturo de Giorgi, Belén Gavela, Luca Merlo et autres

Abstract The neutral anomalies in B decays are analysed in terms of the tree-level exchange of an axion-like-particle (ALP), within the effective field theory framework. The complete two-dimensional parameter space for ALP couplings to electrons and muons is explored. The solutions to …

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