Flavor and new physics opportunities with rare charm decays into leptons

Boer, Stefan de; Hiller, Gudrun

doi:10.1103/physrevd.93.074001

Cited by 90 publications

(198 citation statements)

References 153 publications

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“…For c → uγ transitions, the effective dipole Wilson coefficient at q 2 = 0 induced by P 2 was calculated in [2]. Adding the constant terms given in [3] we have checked the calculations, finding numerical agreement.…”

Section: Numerical Evaluationmentioning

confidence: 96%

“…Exemplary, non-factorizable corrections to form factors are commonly considered as one unreducible uncertainty while interpreting beyond the standard model (BSM) physics. Furthermore, in c → u + − transitions, non-factorizable corrections yield the largest perturbative contribution due to the Glashow-Iliopolus-Maiani (GIM) cancellation of factorizable contributions [2][3][4]. In this paper, we improve on the current state by calculating the two loop virtual corrections to any heavy to light transition, including c and b decays, induced by current-current operators for arbitrary invariant dilepton mass q 2 .…”

Section: Introductionmentioning

confidence: 99%

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Two loop virtual corrections to $$b\rightarrow (d,s)\ell ^+\ell ^-$$ b → ( d , s )

Boer

2017

Eur. Phys. J. C

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Non-factorizable two loop corrections to heavy to light flavor changing neutral current transitions due to matrix elements of current-current operators are calculated analytically for arbitrary momentum transfer. This extends previous work on b → (d, s) + − transitions. New results for c → u + − transitions are presented. Recent work on polylogarithms is used for the master integrals. For b → s + − transitions, the corrections are most significant for the imaginary parts of the effective Wilson coefficients in the large hadronic recoil range. Analytical results and ready-to-use fitted results for a specific set of parameters are provided.

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Section: Numerical Evaluationmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Two loop virtual corrections to $$b\rightarrow (d,s)\ell ^+\ell ^-$$ b → ( d , s )

Boer

2017

Eur. Phys. J. C

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“…In this way one can still look for new-physics scenarios with large Wilson coefficients which are not excluded by current exprerimental data, see e.g. the discussion in the recent literature [13,14]. (To a certain extent, this also applies to the purely radiative decays D → ργ which have recently been seen by the Belle experiment [57].…”

Section: Jhep08(2017)105mentioning

confidence: 99%

“…Nevertheless, there have been a number of phenomenological studies on the new-physics (NP) sensitivities of rare charm decays, including radiative and rare semileptonic D-meson decays induced by c → uγ and c → u + − transitions, see e.g. [4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Jhep08(2017)105mentioning

confidence: 99%

D → ρℓ + ℓ − decays in the QCD factorization approach

Feldmann¹,

Müller²,

Seidel³

2017

J. High Energ. Phys.

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We consider rare semileptonic decays of a heavy D-meson into a light vector meson in the framework of QCD factorization. In contrast to the corresponding B-meson decays, the naive factorization hypothesis does not even serve as a first approximation. Rather, the decay amplitudes appear to be dominated by non-factorizable dynamics, e.g. through annihilation topologies, which are particularly sensitive to long-distance hadronic contributions. We therefore pay particular attention to intermediate vector-meson resonances appearing in quark-loop and annihilation topologies. Compared to the analogous B-meson decays, we identify a number of effects that result in very large theoretical uncertainties for differential decay rates. Some of these effects are found to cancel in the ratio of partially integrated decay rates for transversely and longitudinally polarized ρ mesons. On the phenomenological side this implies a very limited potential to constrain physics beyond the Standard Model by means of these decays.

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“…D 0 → µ + µ − and D → M µ + µ − , are most constraining at the moment (for dineutrino modes cf. [79]), where M can be a pseudoscalar or a vector meson. The effective Wilson coefficient of the left-handed current,…”

Section: Decaysmentioning

confidence: 99%

The role of the S 3 GUT leptoquark in flavor universality and collider searches

Doršner

Fajfer

Faroughy

et al. 2017

J. High Energ. Phys.

104

110

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Abstract:We investigate the ability of the S 3 scalar leptoquark to address the recent hints of lepton universality violation in B meson decays. The S 3 leptoquark with quantum numbers (3, 3, 1/3) naturally emerges in the context of an SU(5) GUT model without any conflict with the stringent limits from observed nucleon stability. Scalar leptoquark S 3 with left-handed couplings to 2nd and 3rd generations of charged leptons and down-type quarks seems well-suited to address both R K ( * ) and R D ( * ) . We quantify this suitability with numerical fits to a plethora of relevant flavor observables. The proposed SU(5) model calls for a second leptoquark state, i.e.,R 2 with quantum numbers (3, 2, 1/6), if one is to generate gauge coupling unification and neutrino mass. We accordingly include it in our study to investigateR 2 's ability to offset adverse effects of S 3 and thus improve a quality of numerical fits. A global fit of the leptoquark Yukawa couplings shows that large couplings of light S 3 to τ leptons are preferred. We furthermore identify B → K ( * )ν ν as the most sensitive channel to probe the preferred region of parameter space. Large couplings of S 3 to τ leptons are finally confronted with the experimental searches for τ final states at the Large Hadron Collider. These searches comprise a study of decay products of the leptoquark pair production, as well as, and more importantly, an analysis of the high-mass τ τ final states.

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Flavor and new physics opportunities with rare charm decays into leptons

Cited by 90 publications

References 153 publications

Two loop virtual corrections to $$b\rightarrow (d,s)\ell ^+\ell ^-$$ b → ( d , s )

Two loop virtual corrections to $$b\rightarrow (d,s)\ell ^+\ell ^-$$ b → ( d , s )

D → ρℓ + ℓ − decays in the QCD factorization approach

The role of the S 3 GUT leptoquark in flavor universality and collider searches

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