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Heavy QCD Axion at Belle II: Displaced and Prompt Signals

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arxiv 2108.10331 v2 pith:YREJMFAJ submitted 2021-08-23 hep-ph hep-ex

Emilie Bertholet , Sabyasachi Chakraborty , Vazha Loladze , Takemichi Okui , Abner Soffer , Kohsaku Tobioka This is my paper · ORCID
classification hep-phhep-ex
keywords axionheavyaxionsbelledecaydisplacedgammalesssim
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The QCD axion is a well-motivated addition to the standard model to solve the strong $C\!P$ problem. If the axion acquires mass dominantly from a hidden sector, it can be as heavy as $O(1)$ GeV, and the decay constant can be as low as $O(100)$ GeV without running into the axion quality problem. We propose new search strategies for such heavy QCD axions at the Belle II experiment, where the axions are expected to be produced via $B\to K a$. We find that a subsequent decay $a\to 3\pi$ with a displaced vertex leads to a unique signal with essentially no background, and that a dedicated search can explore the range $O(1$-$10)$ TeV of decay-constant values. We also show that $a\to \gamma\gamma$ can cover a significant portion of currently unexplored region of $150 \lesssim m_a \lesssim 500$ MeV.

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Cited by 3 Pith papers

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

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    Detector-level simulations indicate the proposed STCF drift chamber could discover the 17 MeV protophobic X17 boson through displaced electron-positron vertices if Standard Model backgrounds stay below about 10^4 even...

  3. 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.

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