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Heavy QCD Axion in $b\to s$ transition: Enhanced Limits and Projections

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arxiv 2102.04474 v4 pith:QD5QOYTF submitted 2021-02-08 hep-ph

Sabyasachi Chakraborty , Manfred Kraus , Vazha Loladze , Takemichi Okui , Kohsaku Tobioka This is my paper · ORCID
classification hep-ph
keywords axionheavyproblemenhancedexistingexperimentallimitsquality
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We study a "heavy" QCD axion whose coupling to the standard model is dominated by $a G \widetilde{G}$ but with $m_a \gg m_\pi f_\pi / f_a$. This is well motivated as it can solve the strong CP problem while evading the axion quality problem. It also poses interesting challenges for its experimental search due to its suppressed couplings to photons and leptons. Such axion with mass around a GeV is kinematically inaccessible or poorly constrained by most experimental probes except B-factories. We study $B \to K a$ transitions as a powerful probe of the heavy QCD axion by performing necessary 2-loop calculations for the first time, together with some improvement on the existing analysis strategy. We find some of the existing limits are enhanced by at least an order of magnitude. We also demonstrate that the bounds are robust against unknown UV physics. For forthcoming data sets of the Belle II experiment, we provide a projection that $f_a$ of a few TeV is within its future reach, which is relevant to the quality problem.

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Cited by 6 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. $B\rightarrow K + \text{axion-like particles}$: effective versus UV-complete models and enhanced two-loop contributions

    hep-ph 2025-06 conditional novelty 7.0 of 10

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    hep-ph 2024-12 conditional novelty 6.0 of 10

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  3. Long-lived sterile neutrinos from axionlike particles at the Super Tau-Charm Facility

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  4. Concurrent Exploration of Axion-Like Particle Interactions with Gauge Bosons at the LHC

    hep-ph 2025-05 conditional novelty 5.0 of 10

    Expected and observed 95% CL limits on the ALP couplings to gluons and W bosons are derived for a 1 MeV ALP, from simulated ZZa/WWa events at the HL-LHC and from recast CMS Z+jets and W+jets measurements.

  5. New axion contribution to the two-photon decays of neutral pions

    hep-ph 2025-02 conditional novelty 5.0 of 10

    Axion-pion mixing adds a new next-to-leading-order term to the pi0 to gamma gamma decay width that is negligible for standard light axions but may matter for MeV-scale heavy axions.

  6. Probing ALP couplings to electroweak gauge bosons

    hep-ph 2025-01 conditional novelty 5.0 of 10

    Rare two-body meson decays give the strongest current bounds on the ALP-W coupling for light ALPs, with Z-boson decays and future lepton colliders extending the reach to heavier masses.

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