We attempt to explain recent anomalies in semileptonic B decays at LHCb via a composite Higgs model, in which both the Higgs and an SU(2)L-triplet leptoquark arise as pseudo-Goldstone bosons of the strong dynamics. Fermion masses are assumed to be generated via the mechanism of partial compositeness, which largely determines the leptoquark couplings and implies non-universal lepton interactions. The latter are needed to accommodate tensions in the b → sμμ dataset and to be consistent with a discrepancy measured at LHCb in the ratio of B<sup>+</sup> → K<sup>+</sup>μ<sup>+</sup>μ<sup>−</sup> to B<sup>+</sup> → K<sup>+</sup>e<sup>+</sup>e<sup>−</sup> branching ratios. The data imply that the leptoquark should have a mass of around a TeV. We find that the model is not in conflict with current flavour or direct production bounds, but we identify a few observables for which the new physics contributions are close to current limits and where the leptoquark is likely to show up in future measurements. The leptoquark will be pair-produced at the LHC and decay predominantly to third-generation quarks and leptons, and LHC13 searches will provide further strong bounds.

Composite leptoquarks and anomalies in B-meson decays / Gripaios, B.; Nardecchia, M.; Renner, S. A.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - 2015:5(2015). [10.1007/JHEP05(2015)006]

Composite leptoquarks and anomalies in B-meson decays

Nardecchia M.;
2015

Abstract

We attempt to explain recent anomalies in semileptonic B decays at LHCb via a composite Higgs model, in which both the Higgs and an SU(2)L-triplet leptoquark arise as pseudo-Goldstone bosons of the strong dynamics. Fermion masses are assumed to be generated via the mechanism of partial compositeness, which largely determines the leptoquark couplings and implies non-universal lepton interactions. The latter are needed to accommodate tensions in the b → sμμ dataset and to be consistent with a discrepancy measured at LHCb in the ratio of B+ → K+μ+μ to B+ → K+e+e branching ratios. The data imply that the leptoquark should have a mass of around a TeV. We find that the model is not in conflict with current flavour or direct production bounds, but we identify a few observables for which the new physics contributions are close to current limits and where the leptoquark is likely to show up in future measurements. The leptoquark will be pair-produced at the LHC and decay predominantly to third-generation quarks and leptons, and LHC13 searches will provide further strong bounds.
2015
B-Physics; Beyond Standard Model; Technicolor and Composite Models
01 Pubblicazione su rivista::01a Articolo in rivista
Composite leptoquarks and anomalies in B-meson decays / Gripaios, B.; Nardecchia, M.; Renner, S. A.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - 2015:5(2015). [10.1007/JHEP05(2015)006]
File allegati a questo prodotto
File Dimensione Formato  
Gripaios_Composite_2015.pdf

accesso aperto

Tipologia: Documento in Post-print (versione successiva alla peer review e accettata per la pubblicazione)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 617.32 kB
Formato Adobe PDF
617.32 kB Adobe PDF

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1313226
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 219
  • ???jsp.display-item.citation.isi??? 212
social impact