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Flavoured axions in the tail of B$_{q}$ → μ$^{+}$ μ$^{-}$ and B → γ$^{*}$ form factors

Albrecht, Johannes; Stamou, Emmanuel; Ziegler, Robert 1; Zwicky, Roman
1 Institut für Theoretische Teilchenphysik (TTP), Karlsruher Institut für Technologie (KIT)


We discuss how LHC di-muon data collected to study B$_{q}$ → 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 B$_{q}$ → 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 B$_{q}$ → 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 10$^{6}$ 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.

Verlagsausgabe §
DOI: 10.5445/IR/1000138930
Veröffentlicht am 13.10.2021
DOI: 10.1007/JHEP09(2021)139
Zitationen: 9
Web of Science
Zitationen: 7
Zitationen: 10
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theoretische Teilchenphysik (TTP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1029-8479, 1126-6708, 1127-2236
KITopen-ID: 1000138930
Erschienen in Journal of High Energy Physics
Verlag Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Band 2021
Heft 9
Seiten Art.-Nr.: 139
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Nachgewiesen in arXiv
Web of Science
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