Rare Decay D 0 →γγ*

Fajfer, Svjetlana; Singer, Paul; Zupan, Jure

doi:10.1007/3-540-36539-7_52

Cited by 5 publications

(5 citation statements)

References 27 publications

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“…The recent work of Ref. [27] provides an independent estimate of the D 0 → γγ transition and obtains a similar order-of-magnitude result.…”

Section: Two-particle Unitarity Contributionsupporting

confidence: 63%

Rare Charm Decays in the Standard Model and Beyond

Hewett¹

2001

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We perform a comprehensive study of a number of rare charm decays, incorporating the first evaluation of the QCD corrections to the short distance contributions, as well as examining the long range effects. For processes mediated by the c → u + − transitions, we show that sensitivity to short distance physics exists in kinematic regions away from the vector meson resonances that dominate the total rate. In particular, we find that D → π + − and D → ρ + − are sensitive to non-universal soft-breaking effects in the Minimal Supersymmetric Standard Model with R-parity conservation. We separately study the sensitivity of these modes to R-parity violating effects and derive new bounds on R-parity violating couplings. We also obtain predictions for these decays within extensions of the Standard Model, including extensions of the Higgs, gauge and fermion sectors, as well as models of dynamical electroweak symmetry breaking.

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“…The recent work of Ref. [27] provides an independent estimate of the D 0 → γγ transition and obtains a similar order-of-magnitude result.…”

Section: Two-particle Unitarity Contributionsupporting

confidence: 63%

Rare Charm Decays in the Standard Model and Beyond

Hewett¹

2001

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“…The SM LD contribution to D 0 → µ + µ − is driven by the total branching fraction of D 0 → γγ [31,32] and is independent of whether the latter is generated by SM or by ND [37]. Hence, enhancements to SM LD contributions to D 0 → µ + µ − can be generated by ND contributions to the D 0 → γγ channel.…”

Section: Rare Decays In Charm Dynamicsmentioning

confidence: 95%

Manifestations of warped extra dimension in rare charm decays and asymmetries

2014

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We study the effects of models with a warped extra dimension on rare charm decays. While the new degrees of freedom in these models are bounded above a few TeV, they can leave signatures in rare charm decays with their tiny Standard Model background. We look at several channels with leptons in the final state along with several asymmetries of both kinematical and dynamical nature. CPT invariance is 'usable' for analyzing the impacts of new dynamics in D meson decays and in particular, rare decays of charm mesons.

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“…In this paper we focus on the so called β-term for D * → Dγ, which is studied in [2,3,4]. This term in the Lagrangian is also relevant for calculation of processes like D 0 → 2γ [5], and D 0 → e + e − γ [6].…”

Section: Introductionmentioning

confidence: 99%

The β-term for D* → D γ within a heavy-light chiral quark model

Hiorth

Eeg

2004

Eur. Phys. J. C

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We present a calculation of the β-term for D * → Dγ within a heavy-light chiral quark model. Within the model, soft gluon effects in terms of the gluon condensate with lowest dimension are included. Also, calculations of 1/m c corrections are performed. We find that the value of β is rather sensitive to the constituent quark mass compared to other quantities calculated within the same model. Also, to obtain a value close to the experimental value, one has to choose a constituent light quark mass larger than for other quantities studied in previous papers. For a light quark mass in the range 250 to 300 MeV and a quark condensate in the range -(250 -270 MeV) 3 we find the value (2.5 ± 0.6) GeV −1 . This value is in agreement with the value of β extracted from experiment (2.7 ± 0.2) GeV −1 . I. INTRODUCTIONStrong and electromagnetic interactions involving heavy and light mesons and photons may be described by heavy-light chiral Lagrangians [1]. Such Lagrangians are determined by chiral symmetry in the light sector in addition to heavy quark symmetry. However, the coupling constants of the terms in the Lagrangian are in general unknown. In this paper we focus on the so called β-term for D * → Dγ, which is studied in [2,3,4]. This term in the Lagrangian is also relevant for calculation of processes like D 0 → 2γ [5], and D 0 → e + e − γ [6].Within chiral perturbation theory alone, the value of β is not determined. In this paper we will calculate the β-term to order 1/m c within a Heavy-Light Chiral Quark Model (HLχQM) developed recently [7]. This model belongs to a class of quark loop models [8,9,10] where * Electronic address: aksel.hiorth@fys.uio.no; Electronic address: j.o.eeg@fys.uio.no

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Rare Decay D 0 →γγ*

Cited by 5 publications

References 27 publications

Rare Charm Decays in the Standard Model and Beyond

Rare Charm Decays in the Standard Model and Beyond

Manifestations of warped extra dimension in rare charm decays and asymmetries

The β-term for D* → D γ within a heavy-light chiral quark model

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