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doi:10.1103/physrevd.105.l071102

Cited by 8 publications

(3 citation statements)

References 32 publications

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“…On the experimental side, the LHCb Collaboration reported that the breaking of lepton universality appears in bottom-quark FCNC decays to charged dielectrons and dimuons with a significance of 3.1σ [11], implying the possible presence of new physics contributions in the lepton sector [12]. Moreover, in 2021, the BESIII Collaboration explored the FCNC decay process and reported that an upper limit of the branching fraction was 2.1 × 10 −4 (ν α γν β )( f γ f )…”

Section: Cpmentioning

confidence: 99%

decay process within the QCDSR approach*

Chen 陈,

Fu 付,

Zhong 钟

et al. 2024

Chinese Phys. C

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In the paper, we investigate the charmed meson rare decay process $D^+ \to \pi^+\nu\bar\nu$ by using the QCD sum rules approach. Firstly, the pion twist-2, 3 distribution amplitudes (DA) moments $\langle\xi_{2;\pi}^n\rangle|_\mu$ and $\langle \xi_{3;\pi}^{(p,\sigma),n}\rangle|_\mu$ are calculated up to 10th-order and fourth-order in the QCD sum rules under background field theory respectively. After constructing the light-cone harmonic oscillator model for pion twist-2, 3 DAs, we get their behaviors by matching the calculated $\xi$-moments. Then, the $D\to \pi$ transition form factors (TFFs) are calculated by using QCD light-cone sum rules approach. The vector form factor at large recoil region is $f_+^{D\to\pi}(0) = 0.627^{+0.120}_{-0.080}$. By taking the rapidly $z(q^2,t)$ converging simplified series expansion, we present the TFFs and the corresponding angular coefficients in the whole squared momentum transfer physical region. Based on the Non-standard neutrino interactions, the $D^+ \to \pi^+ \nu\bar\nu$ decay can be related to $\bar D^0 \to \pi^+ e\bar \nu_e$ decay indirectly. Thus, we firstly display the semileptonic decay process $\bar D^0 \to \pi^+ e\bar \nu_e$ differential decay widths and branching fraction with ${\cal B}(\bar D^0\to\pi^+e\bar\nu_e) = 0.308^{+0.155}_{-0.066} \times 10^{2}$. The $\bar D^0\to\pi^+e\bar\nu_e$ differential/total predictions for forward-backward asymmetry, $q^2$-differential flat terms and lepton polarization asymmetry are also given. Then, prediction for the $D^+ \to \pi^+ \nu\bar\nu$ branching fraction is ${\cal B}(D^+ \to \pi^+ {\nu }{\bar\nu}) = 1.85^{+0.93}_{-0.46}\times10^{-8}$. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

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Section: Cpmentioning

confidence: 99%

decay process within the QCDSR approach*

Chen 陈,

Fu 付,

Zhong 钟

et al. 2024

Chinese Phys. C

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“…Missing energy can stem from right-handed neutrinos ν and/or vector-like dark BSM fermions χ charged under the U (1) only, with mass not exceeding m D /2 ≈ 0.9 GeV. We start with D 0 → π 0 + invisibles, whose branching ratio is constrained by BES III [14] B(D…”

Section: Charm Dilepton and Invisibles Datamentioning

confidence: 99%

Two is better than one: The U-spin-CP anomaly in charm

Bause¹,

Gisbert²,

Hiller³

et al. 2022

Preprint

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The recent measurement of the CP-asymmetry in the decay D → K + K − by LHCb, combined with ∆ACP, evidences a sizable CP-asymmetry in the decay D → π + π − , which requires a dynamical enhancement of standard model higher-order contributions over tree-level ones by a factor of two. The data furthermore imply huge U-spin breaking, about 4-5 times larger than the nominal standard model one of 30% in charm. Enhanced breakdown of the two approximate symmetries points to models that violate U-spin and CP and disfavors flavor singlet contributions such as chromomagnetic dipole operators as explanations of the data. We analyze the reach of flavorful Z models for charm CP-asymmetries. Models generically feature explicit U-spin and isospin breaking, allowing for correlations with D → π 0 π 0 and D + → π + π 0 decays with corresponding CP-asymmetries at similar level and sign as D → π + π − , about O(1−2) • 10 −3 . Experimental and theoretical constraints very much narrow down the shape of viable models: Viable, anomaly-free models are leptophobic, -or at least electron-and muon-phobic -with light Z below O(20) GeV, and can be searched for in low mass dijets at the LHC or in Υ and charmonium decays, as well as dark photon searches. Models can also feature sizable branching ratios into light right-handed neutrinos or vector-like dark fermions, which can be searched for in e + e − → hadrons + invisibles at Belle II and BESIII. Due to the low new physics scale dark fermions can easily induce an early Landau pole, requiring models to be UV-completed near the TeV-scale.

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“…The BESIII Collaboration presented a search for neutrino pair in the final state of charm decays for the first time [8], taking advantage of 2.93fb −1 of data collected at the energy of 3.773 GeV. The final state was reconstructed by means of the double-tag technique: the single-tag D0 was reconstructed in three different hadronic channels (𝐾 + 𝜋 − , 𝐾 + 𝜋 − 𝜋 0 , 𝐾 + 𝜋 − 𝜋 + 𝜋 − ), then the 𝐷 0 decay signal was reconstructed recoilling against the single-tag D0 , finding two photons from 𝜋 0 decay.…”

Section: Search For the Decaymentioning

confidence: 99%