Constraints on the coupling with photons of heavy axion-like-particles from Globular Clusters

Carenza, Pierluca; Straniero, O.; Döbrich, Babette; Giannotti, Maurizio; Lucente, Giuseppe; Mirizzi, Alessandro

doi:10.1016/j.physletb.2020.135709

Cited by 73 publications

(81 citation statements)

References 21 publications

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“…[97], and later updated in Ref. [98], which corrected the previous result to account also for axion production through photon coalescence and for the possibility of axions decay inside the star. The bound at a few 100 keV defines the low mass edge of the so called cosmological triangle, a triangular area in the ALP parameter space which is free from astrophysical and experimental constraints, even though in tension with considerations from standard cosmology.…”

Section: Axion-photon Couplingmentioning

confidence: 99%

“…Massive ALPs coupled to photons can be produced in a SN through Primakoff and through photon coalescence. Detailed discussions can be found in [98][99][100][101][102]. Particularly interesting, in this case, is the trapping regime, in which axions are coupled so strongly that they do not leave the star.…”

Section: Axion-photon Couplingmentioning

confidence: 99%

“…The most important parameters in (98) are the number n of right-handed neutrino flavours and the choice of eigenvalues of M M , i.e., the seesaw scale(s). One ν Ri flavour is needed to generate each non-zero m i ("seesaw fair play rule").…”

Section: An Explicit Example Of Low Scale Seesaw Models: the Pure Type I Seesawmentioning

confidence: 99%

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Feebly-interacting particles: FIPs 2020 workshop report

et al. 2021

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With the establishment and maturation of the experimental programs searching for new physics with sizeable couplings at the LHC, there is an increasing interest in the broader particle and astrophysics community for exploring the physics of light and feebly-interacting particles as a paradigm complementary to a New Physics sector at the TeV scale and beyond. FIPs 2020 has been the first workshop fully dedicated to the physics of feebly-interacting particles and was held virtually from 31 August to 4 September 2020. The workshop has gathered together experts from collider, beam dump, fixed target experiments, as well as from astrophysics, axions/ALPs searches, current/future neutrino experiments, and dark matter direct detection communities to discuss progress in experimental searches and underlying theory models for FIPs physics, and to enhance the cross-fertilisation across different fields. FIPs 2020 has been complemented by the topical workshop “Physics Beyond Colliders meets theory”, held at CERN from 7 June to 9 June 2020. This document presents the summary of the talks presented at the workshops and the outcome of the subsequent discussions held immediately after. It aims to provide a clear picture of this blooming field and proposes a few recommendations for the next round of experimental results.

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Section: Axion-photon Couplingmentioning

confidence: 99%

Section: Axion-photon Couplingmentioning

confidence: 99%

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Feebly-interacting particles: FIPs 2020 workshop report

et al. 2021

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“…The grey regions are current laboratory experimental bounds from LEP [30,33,50], PrimEx [40,51], NA64 [52,53], Belle-II [54], BaBar [27,55] (invisible), and beam-dumps experiments [56][57][58]. The light green region is the astrophysical bound from stellar cooling of HB stars [59]. The dark green line is the projected sensitivity of Belle-2 from the process eē → γ+Missing energy [27].…”

Section: Detection Via Alp Decays a → γγmentioning

confidence: 99%

“…We compare to the current bounds from laboratory experiments such as LEP [30,33,50], PrimEx [40,51], NA64 [52,53], Belle-II [54], BaBar [27,55] (invisible), and beam-dumps experiments [56][57][58]. We also plot the astrophysical bounds from stellar cooling of horizontal branch (HB) stars [59]. Note we chose to exclude the supernova cooling bound from SN 1987 [60], as its robustness is still under debate [61].…”

Section: Detection Via Alp Decays a → γγmentioning

confidence: 99%

Probing Axion‐Like‐Particles at the CERN Gamma Factory

Balkin

Krasny

et al. 2021

Annalen der Physik

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The aim of the proposed CERN Gamma Factory is to produce ∼ 10 17 photons per second with energies up to 400 MeV. The photon beam intensity is expected to be a factor of O(10 7 ) larger than that of the presently available photon beams in the MeV energy range. In this work, we explore its potential to probe physics beyond the Standard Model. In particular, we discuss searches for axion like particles (ALPs) with dominant couplings to photons and consider various production scenarios -fixed target, photon-photon collision, and conversion by a magnetic field -and detection schemes -via decay to photons or back-conversion. We find that the Gamma Factory in a fixed target mode can probe ALPs with mass m a O(100 MeV) and decay constants larger than 10 7 GeV, improving by an order of magnitude the discovery potential of previous beam dump experiments.

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Axion-like particles as mediators for dark matter: beyond freeze-out

Bharucha

Brümmer

Desai

et al. 2023

J. High Energ. Phys.

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We consider an axion-like particle (ALP) coupled to Standard Model (SM) fermions as a mediator between the SM and a fermionic dark matter (DM) particle. We explore the case where the ALP-SM and/or the ALP-DM couplings are too small to allow for DM generation via standard freeze-out. DM is therefore thermally decoupled from the visible sector and must be generated through either freeze-in or decoupled freeze-out (DFO). In the DFO regime, we present an improved approach to obtain the relic density by solving a set of three stiff coupled Boltzmann equations, one of which describes the energy transfer from the SM to the dark sector. Having determined the region of parameter space where the correct relic density is obtained, we revisit experimental constraints from electron beam dump experiments, rare B and K decays, exotic Higgs decays at the LHC, astrophysics, dark matter searches and cosmology. In particular, for our specific ALP scenario we (re) calculate and improve beam dump, flavour and supernova constraints. Throughout our calculation we implement state-of-the-art chiral perturbation theory results for the ALP partial decay width to hadrons. We find that while the DFO region, which predicts extremely small ALP-fermion couplings, can probably only be constrained by cosmological observables, the freeze-in region covers a wide area of parameter space that may be accessible to other more direct probes. Some of this parameter space is already excluded, but a significant part should be accessible to future collider experiments.

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Constraints on the coupling with photons of heavy axion-like-particles from Globular Clusters

Cited by 73 publications

References 21 publications

Feebly-interacting particles: FIPs 2020 workshop report

Feebly-interacting particles: FIPs 2020 workshop report

Probing Axion‐Like‐Particles at the CERN Gamma Factory

Axion-like particles as mediators for dark matter: beyond freeze-out

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