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 models with less-minimal flavor violation

Calibbi, Lorenzo; Crivellin, Andreas; Kirk, Fiona; Manzari, Claudio Andrea; Vernazza, Leonardo

doi:10.1103/physrevd.101.095003

Cited by 51 publications

(27 citation statements)

References 133 publications

(124 reference statements)

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“…Furthermore the expected signal can be made compatible with the preliminary analysis of the KOTO-data that shows a hint for NP [18] (though more investigation of the collaboration is needed). Other explanations of this anomaly can be found in [6][7][8][9][10][11][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 96%

KOTO vs. NA62 dark scalar searches

Gori

Pérez

Tobioka

2020

J. High Energ. Phys.

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The two kaon factories, KOTO and NA62, are at the cutting edge of the intensity frontier, with an unprecedented numbers of long lived and charged Kaons, ∼ 10 13 , being measured and analyzed. These experiments have currently a unique opportunity to search for dark sectors. In this paper, we demonstrate that searches done at KOTO and NA62 are complementary, both probing uncharted territories. We consider two qualitatively different physics cases. In the first, we analyze models of axion-like-particles (ALP) which couple to gluons or electroweak gauge bosons. In the second, we introduce a model based on an approximate strange flavor symmetry that leads to a strong violation of the Grossman-Nir bound. For the first scenario, we design a new search strategy for the KOTO experiment, K L → π 0 a → 4γ. Its expected sensitivity on the branching ratio is at the level of 10 −9. This demonstrates the great potential of KOTO as a discovery machine. In addition, we revisit other bounds on ALPs from Kaon factories, highlighting the main sources of theoretical uncertainty, and collider experiments, and show new projections. For the second scenario, we show that the model may be compatible with the preliminary analysis of the KOTO-data that shows a hint for New Physics.

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Section: Introductionmentioning

confidence: 96%

KOTO vs. NA62 dark scalar searches

Gori

Pérez

Tobioka

2020

J. High Energ. Phys.

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“…In[61] NP entering inside Q5 and Q6 is explored, establishing a link between the B → Kπ puzzle and the ε /ε ratio. This is further addressed in[62] within the context of simplified Z models with U(2) 3 flavour symmetry.…”

mentioning

confidence: 99%

Model-independent bounds on new physics effects in non-leptonic tree-level decays of B-mesons

Lenz

Tetlalmatzi-Xolocotzi

2020

J. High Energ. Phys.

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We present a considerably improved analysis of model-independent bounds on new physics effects in non-leptonic tree-level decays of B-mesons. Our main finding is that contributions of about ±0.1 to the Wilson coefficient of the colour-singlet operator Q 2 of the effective weak Hamiltonian and contributions in the range of ±0.5 (both for real and imaginary part) to Q 1 can currently not be excluded at the 90% C.L.. Effects of such a size can modify the direct experimental extraction of the CKM angle γ by up to 10 • and they could lead to an enhancement of the decay rate difference ∆Γ d of up to a factor of 5 over its SM value-a size that could explain the D0 dimuon asymmetry. Future more precise measurements of the semi-leptonic asymmetries a q sl and the lifetime ratio τ (B s)/τ (B d) will allow to shrink the bounds on tree-level new physics effects considerably. Due to significant improvements in the precision of the non-perturbative input we update all SM predictions for the mixing obervables in the course of this analysis, obtaining: ∆M s = (18.77 ± 0.86) ps −1 , ∆M d = (0.543 ± 0.029) ps −1 , ∆Γ s = (9.1 ± 1.3) • 10 −2 ps −1 , ∆Γ d = (2.6 ± 0.4) • 10 −3 ps −1 , a s sl = (2.06 ± 0.18) • 10 −5 and a d sl = (−4.73 ± 0.42) • 10 −4 .

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“…We should also note that a possibility of the complex Wilson coefficients was recently discussed in Refs. [25,26].…”

Section: R K ( * ) and B(bmentioning

confidence: 99%

Enhanced CP asymmetries in $$B \rightarrow K \mu ^+ \mu ^-$$

et al. 2020

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We show that the current values of $$R_K^\mathrm {exp}$$ R K exp and $$R_{K^*}^\mathrm {exp}$$ R K ∗ exp can be accommodated by allowing a nonzero New Physics coupling $$\delta C_9^{\mu \mu }$$ δ C 9 μ μ to be complex, both in the scenario in which only $$\delta C_9^{\mu \mu }$$ δ C 9 μ μ is affected, and in the scenario with complex $$\delta C_{9,10}^{\mu \mu }$$ δ C 9 , 10 μ μ satisfying $$\delta C_{9}^{\mu \mu }=-\delta C_{10}^{\mu \mu }$$ δ C 9 μ μ = - δ C 10 μ μ . A presence of the weak CP-violating phase can then be tested by measuring the CP-asymmetry, $$\mathcal {A}_\mathrm {CP}$$ A CP . We show that this asymmetry is enhanced around the peak of each $$c\bar{c}$$ c c ¯ -resonance, and in fact more pronounced in the close vicinity of $$J/\psi $$ J / ψ and $$\psi (2S)$$ ψ ( 2 S ) . Therefore, measuring $$\mathcal {A}_\mathrm {CP}$$ A CP before and after the resonances’ peak could be revelatory of the CP-violation that originates from beyond the Standard Model, or to be a significant constrain when building a realistic scenario of New Physics.

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Z′ models with less-minimal flavor violation

Cited by 51 publications

References 133 publications

KOTO vs. NA62 dark scalar searches

KOTO vs. NA62 dark scalar searches

Model-independent bounds on new physics effects in non-leptonic tree-level decays of B-mesons

Enhanced CP asymmetries in $$B \rightarrow K \mu ^+ \mu ^-$$

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