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151 research outcomes, page 1 of 16
  • publication . Preprint . Article . 2018
    Open Access English
    Authors:
    Nicolás Bernal; Maíra Dutra; Yann Mambrini; Keith A. Olive; Marco Peloso; Mathias Pierre;
    Persistent Identifiers
    Project: EC | InvisiblesPlus (690575), EC | ELUSIVES (674896)

    We generalize models invoking a spin-2 particle as a mediator between the dark sector and the Standard Model. We show that a massive spin-2 messenger can efficiently play the role of a portal between the two sectors. The dark matter is then produced via a freeze-in mech...

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  • publication . Preprint . Article . Other literature type . 2019
    Open Access English
    Authors:
    Marcel Algueró; Bernat Capdevila; Andreas Crivellin; Sébastien Descotes-Genon; Pere Masjuan; Joaquim Matias; Javier Virto;
    Project: EC | InvisiblesPlus (690575), EC | NIOBE (700525), EC | ELUSIVES (674896)

    Comment: 18 pages, 36 figures. Includes Addendum in an appendix with updated fit results and discussion taking into account the LHCb results on $B\to K^{*}\mu\mu$ angular observables of March, 2020. Colours of plots uniformized all over the paper. Version published at E...

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  • publication . Article . Preprint . 2019
    Open Access English
    Authors:
    Coy, Rupert; Frigerio, Michele; Mescia, Federico; Sumensari, Olcyr;
    Publisher: HAL CCSD
    Project: ANR | OCEVU (ANR-11-LABX-0060), EC | ELUSIVES (674896), ANR | Amidex (ANR-11-IDEX-0001), EC | InvisiblesPlus (690575)

    Comment: v2: 15 pages, 6 figures; Section III.2 extended, Table II and Fig. 6 correspondingly updated, references added

  • publication . Preprint . Article . 2016
    Open Access English
    Authors:
    Capdevila, Bernat; Descotes-Genon, Sébastien; Matias, Joaquim; Virto, Javier;
    Project: EC | ELUSIVES (674896), EC | InvisiblesPlus (690575), EC | RBI-T-WINNING (692194)

    Comment: 38 pages, 8 figures

  • publication . Article . Preprint . 2017
    Open Access English
    Authors:
    A. Abada; Damir Becirevic; Olcyr Sumensari; C. Weiland; R. Zukanovich Funchal;
    Persistent Identifiers
    Publisher: HAL CCSD
    Project: EC | InvisiblesPlus (690575), EC | NUMASS (617143), EC | ELUSIVES (674896)

    We discuss weak kaon decays in a scenario in which the Standard Model is extended by massive sterile fermions. After revisiting the analytical expressions for leptonic and semileptonic decays we derive the expressions for decay rates with two neutrinos in the final stat...

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  • publication . Article . Preprint . 2019
    Open Access English
    Authors:
    Escudero, Miguel; Hooper, Dan; Krnjaic, Gordan; Pierre, Mathias;
    Publisher: HAL CCSD
    Project: EC | DARKHORIZONS (648680), EC | ELUSIVES (674896), EC | InvisiblesPlus (690575)

    Comment: 13 pages + 5 appendices, 10 figures. v2: Added comment to reflect that $\Delta N_{eff}$ is only modified for $m_{Z'} > {\rm eV}$ and cropped Fig. 2 accordingly. Added comment on possible cosmological energy injection bounds. Main conclusions unchanged. Added re...

  • publication . Preprint . 2018
    Open Access English
    Authors:
    Falkowski, Adam; Petraki, Kalliopi;
    Publisher: HAL CCSD
    Project: EC | InvisiblesPlus (690575), EC | ELUSIVES (674896)

    The unexpectedly strong 21cm absorption signal detected by the EDGES experiment suggests that the baryonic gas was colder at redshift $z\sim 17$ than predicted in the standard scenario. We discuss a mechanism to lower the baryon temperature after recombination. We intro...

  • publication . Preprint . Article . 2019
    Open Access English
    Authors:
    Debashree Chowdhury; Emilian Dudas; Maíra Dutra; Yann Mambrini;
    Persistent Identifiers
    Project: EC | InvisiblesPlus (690575), ANR | Black-dS-String (ANR-16-CE31-0004), EC | ELUSIVES (674896)

    We show that moduli fields as mediators between the Standard Model and the dark sector can naturally lead to the observed relic abundance. Indeed, even if moduli are very massive, the nature of their couplings with matter and gauge fields allows producing a sufficiently...

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  • publication . Preprint . 2021
    Open Access English
    Authors:
    Génolini, Yoann; Boudaud, Mathieu; Cirelli, Marco; Derome, Laurent; Lavalle, Julien; Maurin, David; Salati, Pierre; Weinrich, Nathanael;
    Publisher: HAL CCSD
    Project: EC | InvisiblesPlus (690575), ANR | OCEVU (ANR-11-LABX-0060), EC | ELUSIVES (674896), ANR | GaDaMa (ANR-18-CE31-0006)

    Comment: 20 pages, 9 figures, 6 tables

  • publication . Article . Preprint . 2018
    Open Access English
    Authors:
    Diego Guadagnoli; Méril Reboud; Olcyr Sumensari;
    Persistent Identifiers
    Publisher: HAL CCSD
    Project: EC | ELUSIVES (674896)

    One of the greatest challenges for models of $b \to s$ anomalies is the necessity to produce a large contribution to a quark times a lepton current, $J_q \times J_\ell$, and to avoid accordingly large contributions to flavour-changing $J_q \times J_q$ and $J_\ell \times...

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151 research outcomes, page 1 of 16