scholarly journals Rare radiative charm decays within the standard model and beyond

2017 ◽  
Vol 2017 (8) ◽  
Author(s):  
Stefan de Boer ◽  
Gudrun Hiller
Keyword(s):  
Standard Model ◽  
Charm Decays ◽  
The Standard Model

CHARM MIXING AND CP VIOLATION AT B-FACTORIES

2014 ◽  
Vol 35 ◽  
pp. 1460413
Author(s):  
GIANLUIGI CIBINETTO ◽  
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
New Physics ◽  
Ratio Analysis ◽  
Charm Meson ◽  
Final State ◽  
Charm Decays ◽  
Decay Modes ◽  
The Standard Model ◽  
Model Predictions

CP violation in charm decays is expected to be very small in the Standard Model, at the level of 0.1% or less. A sizable excess of CP violation with respect to the Standard Model predictions could be a signature of new physics. We report on recent searches for CP violation in charm meson decays at BABAR and Belle experiments. In particular we report a lifetime ratio analysis of D0 → K+K−, π+π− with respect to D0 → K−π+ decays, which is sensitive to [Formula: see text] mixing and CP violation. We report also on searches for CPV in the 3-body D+ → K+K−π+ decay and for decay modes with a [Formula: see text] in the final state, such as [Formula: see text].

CHARM DECAYS WITHIN THE STANDARD MODEL AND BEYOND

2006 ◽  
Vol 21 (08n09) ◽  
pp. 1697-1709 ◽  
Author(s):  
MARINA ARTUSO
Keyword(s):  
Standard Model ◽  
Charm Quark ◽  
New Physics ◽  
Charm Physics ◽  
Experimental Information ◽  
Charm Decays ◽  
Mixing Parameters ◽  
The Standard Model ◽  
The Status ◽  
Good Agreement

The charm quark has unique properties that make it a very important probe of many facets of the Standard Model. New experimental information on charm decays is becoming available from dedicated experiments at charm factories, and through charm physics programs at the b-factories and hadron machines. In parallel, theorists are working on matrix element calculations based on unquenched lattice QCD, that can be validated by experimental measurements and affect our ultimate knowledge of the quark mixing parameters. Recent predictions are compared with corresponding experimental data and good agreement is found. Charm decays can also provide unique new physics signatures; the status of present searches is reviewed. Finally, charm data relevant for improving beauty decay measurements are presented.

scholarly journals Radiative three-body D-meson decays in and beyond the standard model

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
Nico Adolph ◽  
Joachim Brod ◽  
Gudrun Hiller
Keyword(s):  
Standard Model ◽  
D Meson ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Charm Decays ◽  
Qcd Factorization ◽  
Heavy Hadron ◽  
The Standard Model ◽  
Cabibbo Suppressed ◽  
Three Body

AbstractWe study radiative charm decays $$D \rightarrow P_1 P_2 \gamma $$ D → P 1 P 2 γ , $$P_{1,2}=\pi ,K$$ P 1 , 2 = π , K in QCD factorization at leading order and within heavy hadron chiral perturbation theory. Branching ratios including resonance contributions are around $$\sim 10^{-3}$$ ∼ 10 - 3 for the Cabibbo-favored modes into $$K \pi \gamma $$ K π γ and $$\sim 10^{-5}$$ ∼ 10 - 5 for the singly Cabibbo-suppressed modes into $$\pi ^+ \pi ^- \gamma , K^+ K^- \gamma $$ π + π - γ , K + K - γ , and thus in reach of the flavor factories BES III and Belle II. Dalitz plots and forward–backward asymmetries reveal significant differences between the two QCD frameworks; such observables are therefore ideally suited for a data-driven identification of relevant decay mechanisms in the standard-model dominated $$D \rightarrow K \pi \gamma $$ D → K π γ decays. This increases the potential to probe new physics with the $$D \rightarrow \pi ^+ \pi ^- \gamma $$ D → π + π - γ and $$D \rightarrow K^+ K^- \gamma $$ D → K + K - γ decays, which are sensitive to enhanced dipole operators. CP asymmetries are useful to test the SM and look for new physics in neutral $$|\Delta C|=1$$ | Δ C | = 1 transitions. Cuts in the Dalitz plot enhance the sensitivity to new physics due to the presence of both s- and t, u-channel intermediate resonances.

scholarly journals Theoretical and experimental status of rare charm decays

2021 ◽  
Vol 36 (04) ◽  
pp. 2130002
Author(s):  
Hector Gisbert ◽  
Marcel Golz ◽  
Dominik Stefan Mitzel
Keyword(s):  
Standard Model ◽  
New Physics ◽  
Charm Decays ◽  
Approximate Symmetries ◽  
Experimental Status ◽  
Lepton Flavor ◽  
Energy Dynamics ◽  
Flavor Changing ◽  
The Standard Model ◽  
Rare Charm

Rare charm decays offer the unique possibility to explore flavor-changing neutral-currents in the up-sector within the Standard Model and beyond. Due to the lack of effective methods to reliably describe its low energy dynamics, rare charm decays have been considered as less promising for long. However, this lack does not exclude the possibility to perform promising searches for New Physics per se, but a different philosophy of work is required. Exact or approximate symmetries of the Standard Model allow to construct clean null-test observables, yielding an excellent road to the discovery of New Physics, complementing the existing studies in the down-sector. In this review, we summarize the theoretical and experimental status of rare charm [Formula: see text] transitions, as well as opportunities for current and future experiments such as LHCb, Belle II, BES III, the FCC-ee and proposed tau-charm factories. We also use the most recent experimental results to report updated limits on lepton-flavor conserving and lepton-flavor violating Wilson coefficients.

scholarly journals Rare charm decays in the standard model and beyond

2002 ◽  
Vol 66 (1) ◽  
Author(s):  
Gustavo Burdman ◽  
Eugene Golowich ◽  
JoAnne Hewett ◽  
Sandip Pakvasa
Keyword(s):  
Standard Model ◽  
Charm Decays ◽  
The Standard Model ◽  
Rare Charm
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