Abstract
We present a novel data-driven method for determining the hadronic interaction strengths of axionlike particles (ALPs) with QCD-scale masses. Using our method, it is possible to calculate the hadronic production and decay rates of ALPs, along with many of the largest ALP decay rates to exclusive final states. To illustrate the impact on QCD-scale ALP phenomenology, we consider the scenario where the ALP-gluon coupling is dominant over the ALP coupling to photons, electroweak bosons, and all fermions for m_{π}≲m_{a}≲3 GeV. We emphasize, however, that our method can easily be generalized to any set of ALP couplings to standard model particles. Finally, using the approach developed here, we provide calculations for the branching fractions of η_{c}→VV decays; i.e., η_{c} decays into two vector mesons, which are consistent with the known experimental values.
Highlights
Axionlike particles (ALPs) are hypothetical pseudoscalars whose couplings to the gauge bosons of the standard model (SM)—the gluons, photons, and electroweak bosons —are highly suppressed at low energies by a large cutoff scale Λ
For mπ ≲ ma ≲ 3 GeV, i.e., the scenario where the ALPgluon coupling is dominant over the ALP coupling to photons, electroweak bosons, and all fermions
The impact of ALP couplings to photons, electroweak bosons, leptons, and heavy quarks is known [26], while additional direct couplings to light quarks are handled within our framework
Summary
Since a → ππ and a → π0γ are forbidden by CP and C, respectively, the dominant hadronic decays for low-mass. By performing a chiral transformation of the light-quark fields [30,31,32], we replace the agg vertex by ALP-quark axial-current couplings, which we subsequently match to the chiral Lagrangian This leads to ALP-π0 kinetic mixing and ALP-ηð0Þ kinetic and mass mixing making it possible to assign the ALP a Uð3Þ representation at low masses. We assign all ALPs up to ≈3 GeV the Uð3Þ representation
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
