Abstract
In this work, we reinterpret ATLAS and CMS dijet resonance searches to set robust constraints on all hypothetical tree-level scalar and vector mediators with masses up to 5 TeV, assuming a diquark or a quark-antiquark coupling with an arbitrary flavor composition. To illustrate the application of these general results, we quantify the permissible size of new physics in {overline{B}}_qto {D}_q^{left(ast right)+}left{pi, Kright} consistent with the absence of signal in dijet resonance searches. Along the way, we perform a full SMEFT analysis of the aforementioned non-leptonic B meson decays at leading-order in αs. Our findings uncover a pressing tension between the new physics explanations of recently reported anomalies in these decays and the dijet resonant searches. The high-pT constraints are crucial to drain the parameter space consistent with the low-pT flavor physics data.
Highlights
In order to exemplify the importance of these results, we investigate potential new physics (NP) effects in the branching ratio of Bs → Ds(∗)+π and B → D(∗)+K decays
Among all possible dimension-six SMEFT coefficients, we focus on the dimension-six four-fermion operators that either contribute directly at tree-level to b → cudi or strongly mix with such operators
The SMEFT operators identified in the previous section can be generated already at treelevel by integrating out a new bosonic field X coupled to quark currents
Summary
We reinterpret the latest ATLAS and CMS dijet searches in terms of constraints on a generic resonance X coupled to a pair of SM quarks of an arbitrary flavor, decaying predominantly into jets. In the second part of the study, where we focus on the NP explanation of b → cudi anomalies, the narrow width approximation is valid in a broad mass range assuming the minimal set of couplings. If the resonance mass mX is above the reach for on-shell production at the LHC, its effect can be studied in the high-pT dijet tails in terms of four-quark contact interactions. The non-leptonic decays studied in the second part of the paper focus on the weakly coupled ultraviolet (UV) completions for which the resonance searches are sufficient, while contact interactions will be relevant for strongly coupled UV completions
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