On Partial Compositeness and the CP asymmetry in charm decays

By Boaz Keren-Zur, P. Lodone, Marco Nardecchia, Duccio Pappadopulo, R. Rattazzi, L. Vecchi. 2012

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Recently, the LHCb and CDF collaborations reported the measure of an unexpectedly large direct CP asymmetry in D meson decays. In this paper we ask if new physics associated with Partial Compositeness could plausibly explain this result. We nd that Composite Higgs models with mass scale around 10 TeV can account for it, while marginally satisfying all other avor constraints in the quark sector. The minimal framework is however inadequate in the lepton sector due to the strong constraint from ! e . This tension can be eciently alleviated by realizing Partial Compositeness within Supersymmetry. The resulting models can saturate the CP asymmetry in D decays for superpartner masses close to the TeV scale and somewhat large A-terms. The supersymmetric realization of Partial Compositeness also oers a predictive and phenomenologically viable organizing principle for R-Parity violation, and may result in very distinctive signatures at hadron colliders. With or without Supersymmetry, the neutron EDM is expected to be around the present experimental sensitivity.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/770ccb592b1bf5881d7289ad00138721554ffb96

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Citations in the corpus

A first top partner hunter’s guide (2012, unknown): “[6] for a recent appraisal).”
The Composite Nambu-Goldstone Higgs (2015, methodology): “For this reason it is worth introducing a new mass scale mψ (with its associated coupling gψ = mψ/f) that characterizes the fermionic states [112, 128, 129].”
What is the scale of new physics behind the B-flavour anomalies? (2017, background): “[30]) that the Q i are linked to the size of the CKM matrix elements, i.”
Implications of LHCb measurements and future prospects - eScholarship (2013, background): “This scenario can also be interpreted within the framework of partial compositeness in four dimensions, but generic composite models typically require smaller Yukawa couplings to explain ACP and consequently predict sizeable contributions to CP violation in F = 2 processes [480].”
Charged Lepton Flavour Violation: An Experimental and Theoretical Introduction (2017, background): “a flavour symmetry such as SU(3), U(2), A4 (for studies focusing on CLFV within these classes of models, see [163, 164, 165, 166, 167]), or the partial compositeness of the fermions in strongly-interacting theories with a composite Higgs/extra-dimensional Randall-Sundrum models [161, 168, 169, 170].”