Exploiting dijet resonance searches for flavor physics

Bordone, Marzia; Greljo, Admir; Marzocca, David

doi:10.1007/jhep08(2021)036

Cited by 33 publications

(30 citation statements)

References 89 publications

(151 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A simple scaling was used in Ref. [74] to reinterpret the results [72,73] in the benchmark of new gauge boson W to other mediators. We have verified that the reinterpretation in Ref.…”

Section: Dijet Resonance Searchmentioning

confidence: 99%

Uncovering a chirally suppressed mechanism of $0νββ$ decay with LHC searches

Graesser¹,

Li²,

Ramsey-Musolf³

et al. 2022

Preprint

View full text Add to dashboard Cite

∆L = 2 lepton number violation (LNV) at the TeV scale could provide an alternative interpretation of positive signal(s) in future neutrinoless double beta (0νββ) decay experiments. An interesting class of models from this point of view are those that at low energies give rise to dimension-9 vector operators and a dimension-7 operator, both of whose 0νββ-decay rates are "chirally suppressed". We study and compare for the first time the sensitivities of 0νββ-decay experiments and LHC searches to a simplified model in this class of TeV-scale LNV. Due to the chiral suppression of the vector operators, 0νββ-decay searches are found to be less constraining than LHC searches. For the chirally suppressed dimension-7 operator generated by TeV-scale mediators, in contrast, 0νββ-decay searches place strong constraints on the size of the new Yukawa coupling. Signals of this model at the LHC and 0νββ-decay experiments are entirely uncorrelated with the observed neutrinos masses, as these new sources of LNV give negligible contributions to the latter. We find the prospects for the high-luminosity LHC and ton-scale 0νββ-decay experiments to uncover the chirally-suppressed mechanism with TeV-scale LNV to be promising. We also comment on the sensitivity of the 0νββ-decay lifetime to certain unknown low-energy constants that in the case of dimension-9 scalar operators are expected to be large due to non-perturbative renormalization.

show abstract

“…A simple scaling was used in Ref. [74] to reinterpret the results [72,73] in the benchmark of new gauge boson W to other mediators. We have verified that the reinterpretation in Ref.…”

Section: Dijet Resonance Searchmentioning

confidence: 99%

Uncovering a chirally suppressed mechanism of $0νββ$ decay with LHC searches

Graesser¹,

Li²,

Ramsey-Musolf³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…In this paper, as an alternative, we shall examine possible NP interpretations of the deviations observed; for recent discussions along this line, see refs. [40][41][42][43][44][45].…”

Section: Jhep10(2021)235mentioning

confidence: 99%

“…As emphasized already in ref. [51], such an NLO analysis in the NP sector is crucial for reducing certain unphysical scale and renormalization scheme dependences present in the absence of these O(α s ) corrections [40][41][42][43][44][45]. It is numerically found that, under the combined constraints from the current experimental data, the deviations observed could be well explained at the 1σ level by the NP four-quark operators with γ µ (1 − γ 5 ) ⊗ γ µ (1 − γ 5 ) structure, and also at the 2σ level by the operators with (1 + γ 5 ) ⊗ (1 − γ 5 ) and (1 + γ 5 ) ⊗ (1 + γ 5 ) structures.…”

Section: Jhep10(2021)235mentioning

confidence: 99%

Probing new physics in class-I B-meson decays into heavy-light final states

Cai

Deng

et al. 2021

J. High Energ. Phys.

View full text Add to dashboard Cite

With updated experimental data and improved theoretical calculations, several significant deviations are being observed between the Standard Model predictions and the experimental measurements of the branching ratios of $$ {\overline{B}}_{(s)}^0\to {D}_{(s)}^{\left(\ast \right)+}{L}^{-} $$ B ¯ s 0 → D s ∗ + L − decays, where L is a light meson from the set {π, ρ, K(∗)}. Especially for the two channels $$ {\overline{B}}^0\to {D}^{+}{K}^{-} $$ B ¯ 0 → D + K − and $$ {\overline{B}}_s^0\to {D}_s^{+}{\pi}^{-} $$ B ¯ s 0 → D s + π − , both of which are free of the weak annihilation contribution, the deviations observed can even reach 4–5σ. Here we exploit possible new-physics effects in these class-I non-leptonic B-meson decays within the framework of QCD factorization. Firstly, we perform a model-independent analysis of the effects from twenty linearly independent four-quark operators that can contribute, either directly or through operator mixing, to the quark-level b →$$ c\overline{u}d(s) $$ c u ¯ d s transitions. It is found that, under the combined constraints from the current experimental data, the deviations observed could be well explained at the 1σ level by the new-physics four-quark operators with γμ(1 − γ5) ⨂ γμ(1 − γ5) structure, and also at the 2σ level by the operators with (1 + γ5) ⨂ (1 − γ5) and (1 + γ5) ⨂ (1 + γ5) structures. However, the new-physics four-quark operators with other Dirac structures fail to provide a consistent interpretation, even at the 2σ level. Then, as two specific examples of model-dependent considerations, we discuss the case where the new-physics four-quark operators are generated by either a colorless charged gauge boson or a colorless charged scalar, with their masses fixed both at the 1 TeV. Constraints on the effective coefficients describing the couplings of these mediators to the relevant quarks are obtained by fitting to the current experimental data.

show abstract

“…(s) → D + (s) π − [5][6][7][8]. Such decays are dominated by colour-allowed tree topologies JHEP10(2021)223…”

Section: Introductionmentioning

confidence: 99%

QED factorization of two-body non-leptonic and semi-leptonic B to charm decays

Beneke

Böer

Finauri

et al. 2021

J. High Energ. Phys.

View full text Add to dashboard Cite

The QCD×QED factorization is studied for two-body non-leptonic and semi-leptonic B decays with heavy-light final states. These non-leptonic decays, like $$ {\overline{B}}_{(s)}^0\to {D}_{(s)}^{+}{\pi}^{-} $$ B ¯ s 0 → D s + π − and $$ {\overline{B}}_d^0\to {D}^{+}{K}^{-} $$ B ¯ d 0 → D + K − , are among the theoretically cleanest non-leptonic decays as penguin loops do not contribute and colour-suppressed tree amplitudes are suppressed in the heavy-quark limit or even completely absent. Advancing the theoretical calculations of such decays requires therefore also a careful analysis of QED effects. Including QED effects does not alter the general structure of factorization which is analogous for both semi-leptonic and non-leptonic decays. For the latter, we express our result as a correction of the tree amplitude coefficient a1. At the amplitude level, we find QED effects at the sub-percent level, which is of the same order as the QCD uncertainty. We discuss the phenomenological implications of adding QED effects in light of discrepancies observed between theory and experimental data, for ratios of non-leptonic over semi-leptonic decay rates. At the level of the rate, ultrasoft photon effects can produce a correction up to a few percent, requiring a careful treatment of such effects in the experimental analyses.

show abstract

Exploiting dijet resonance searches for flavor physics

Cited by 33 publications

References 89 publications

Uncovering a chirally suppressed mechanism of $0νββ$ decay with LHC searches

Uncovering a chirally suppressed mechanism of $0νββ$ decay with LHC searches

Probing new physics in class-I B-meson decays into heavy-light final states

QED factorization of two-body non-leptonic and semi-leptonic B to charm decays

Contact Info

Product

Resources

About