Quark flavor phenomenology of the QCD axion

Jorge Martin Camalich (Instituto de Astrofísica de Canarias, s/n, E-38205, La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna, E-38206, La Laguna, Tenerife, Spain) ; Maxim Pospelov (School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA; William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA) ; Pham Ngoc Hoa Vuong (Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS/IN2P3, Grenoble INP, 38000 Grenoble, France) ; Robert Ziegler (Theoretical Physics Department, CERN, 1 Esplanade des Particules, 1211 Geneva 23, Switzerland; Institut für Theoretische Teilchenphysik (TTP), Karlsruher Institut für Technologie (KIT), 76131 Karlsruhe, Germany) ; Jure Zupan (Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221, USA)

Axion models with generation-dependent Peccei-Quinn charges can lead to flavor-changing neutral currents, thus motivating QCD axion searches at precision flavor experiments. We rigorously derive limits on the most general effective flavor-violating couplings from current measurements and assess their discovery potential. For two-body decays, we use available experimental data to derive limits on qqa decay rates for all flavor transitions. Axion contributions to neutral-meson mixing are calculated in a systematic way using chiral perturbation theory and operator product expansion. We also discuss in detail baryonic decays and three-body meson decays, which can lead to the best search strategies for some of the couplings. For instance, a strong limit on the Λna transition can be derived from the supernova SN 1987A. In the near future, dedicated searches for qqa decays at ongoing experiments could potentially test Peccei-Quinn breaking scales up to 1012 GeV at NA62 or KOTO and up to 109 GeV at Belle II or BES III.

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      "source": "APS", 
      "value": "Axion models with generation-dependent Peccei-Quinn charges can lead to flavor-changing neutral currents, thus motivating QCD axion searches at precision flavor experiments. We rigorously derive limits on the most general effective flavor-violating couplings from current measurements and assess their discovery potential. For two-body decays, we use available experimental data to derive limits on <math><mi>q</mi><mo>\u2192</mo><msup><mi>q</mi><mo>\u2032</mo></msup><mi>a</mi></math> decay rates for all flavor transitions. Axion contributions to neutral-meson mixing are calculated in a systematic way using chiral perturbation theory and operator product expansion. We also discuss in detail baryonic decays and three-body meson decays, which can lead to the best search strategies for some of the couplings. For instance, a strong limit on the <math><mi>\u039b</mi><mo>\u2192</mo><mi>n</mi><mi>a</mi></math> transition can be derived from the supernova SN 1987A. In the near future, dedicated searches for <math><mi>q</mi><mo>\u2192</mo><msup><mi>q</mi><mo>\u2032</mo></msup><mi>a</mi></math> decays at ongoing experiments could potentially test Peccei-Quinn breaking scales up to <math><msup><mn>10</mn><mn>12</mn></msup><mtext> </mtext><mtext> </mtext><mi>GeV</mi></math> at NA62 or KOTO and up to <math><msup><mn>10</mn><mn>9</mn></msup><mtext> </mtext><mtext> </mtext><mi>GeV</mi></math> at Belle II or BES III."
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Published on:
27 July 2020
Publisher:
APS
Published in:
Physical Review D , Volume 102 (2020)
Issue 1
DOI:
https://doi.org/10.1103/PhysRevD.102.015023
arXiv:
2002.04623
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

Fulltext files: