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- Title
Flavoured axions in the tail of B<sub>q</sub> → μ<sup>+</sup>μ<sup>−</sup> and B → γ<sup>*</sup> form factors.
- Authors
Albrecht, Johannes; Stamou, Emmanuel; Ziegler, Robert; Zwicky, Roman
- Abstract
We discuss how LHC di-muon data collected to study Bq → μμ can be used to constrain light particles with flavour-violating couplings to b-quarks. Focussing on the case of a flavoured QCD axion, a, we compute the decay rates for Bq → μμa and the SM background process Bq → μμγ near the kinematic endpoint. These rates depend on non-perturbative Bq → γ(*) form factors with on- or off-shell photons. The off-shell form factors — relevant for generic searches for beyond-the-SM particles — are discussed in full generality and computed with QCD sum rules for the first time. This includes an extension to the low-lying resonance region using a multiple subtracted dispersion relation. With these results, we analyse available LHCb data to obtain the sensitivity on Bq → μμa at present and future runs. We find that the full LHCb dataset alone will allow to probe axion-coupling scales of the order of 106 GeV for both b → d and b → s transitions. As a spin-off application of the off-shell form factors we further analyse the case of light, Beyond the Standard Model, vectors.
- Subjects
DISPERSION relations; AXIONS; STANDARD model (Nuclear physics); QUANTUM chromodynamics; PHOTONS
- Publication
Journal of High Energy Physics, 2021, Vol 2021, Issue 9, p1
- ISSN
1126-6708
- Publication type
Article
- DOI
10.1007/JHEP09(2021)139