Revised constraints and Belle II sensitivity for visible and invisible axion-like particles

By M. Dolan, T. Ferber, C. Hearty, Felix Kahlhoefer, K. Schmidt-Hoberg. 2017

239 citations recorded by the source corpus.

A bstractLight pseudoscalars interacting pre-dominantly with Standard Model gauge bosons (so-called axion-like particles or ALPs) occur frequently in extensions of the Standard Model. In this work we review and update existing constraints on ALPs in the keV to GeV mass region from colliders, beam dump experiments and astrophysics. We furthermore provide a detailed calculation of the expected sensitivity of Belle II, which can search for visibly and invisibly decaying ALPs, as well as long-lived ALPs. The Belle II sensitivity is found to be substantially better than previously estimated, covering wide ranges of relevant parameter space. In particular, Belle II can explore an interesting class of dark matter models, in which ALPs mediate the interactions between the Standard Model and dark matter. In these models, the relic abundance can be set via resonant freeze-out, leading to a highly predictive scenario consistent with all existing constraints but testable with single-photon searches at Belle II in the near future.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/8180adb06c85e87801bb6cd917961e432a464e29

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. G. Krnjaic
2. A. Berlin
3. S. Knapen
4. P. Schuster
5. N. Toro
6. A. Lindner
7. G. Lanfranchi
8. Luca Visinelli

In Nuclear and High Energy Physics

1. G. Krnjaic
2. M. Bauer
3. P. Schuster
4. N. Toro
5. Igor G. Irastorza
6. S. Knapen
7. G. Lanfranchi
8. Jonathan L. Feng

Citations in the corpus

• Factoring the strong CP problem (2017, methodology): “Also show are the constraints from by monophoton and beam dump experiments (adapted from [73]).”
• The landscape of QCD axion models (2020, background): “These bounds are nicely complemented by constraints from beam dump and reactor experiments which exclude axion (and ALP) masses from MeV up to several GeVs [282–293].”
• Physics beyond colliders at CERN: beyond the Standard Model working group report (2019, background): “searches for highly-energetic photons in association with missing energy resulting from the process ( g  +  + e e a a invisible) have been performed as well [320] but they are not sensitive to ALPs with mass in the sub-GeV range [311].”
• Dark matter, millicharges, axion and scalar particles, gauge bosons, and other new physics with LDMX (2018, methodology): “Projections for SHiP [160], a SeaQuestlike experiment with sensitivity to γγ final states [103], Belle II 3 photon search (50 ab−1 integrated luminosity) [161] are shown as thin dashed lines.”
• FASER’s physics reach for long-lived particles (2018, methodology): “Besides recasting the dark photon search sensitivity at Belle-II [14], LHCb [15, 16], SeaQuest [59] and SHiP [20], they include additionally search strategies utilizing the A′ → νν decay channel at Belle-II and NA64 [18].”
• Collider probes of axion-like particles (2017, background): “After the submission of this paper, two new analyses discussing first experimental results in heavyion collisions [135] and bounds from beam-dump searches [136] have been submitted to”