scholarly journals Flavor and new physics opportunities with rare charm decays into leptons

2016 ◽  
Vol 93 (7) ◽  
Author(s):  
Stefan de Boer ◽  
Gudrun Hiller
Keyword(s):  
New Physics ◽  
Charm Decays ◽  
Rare Charm

Chapter 27 Rare and Forbidden Charm Decays

2009 ◽  
Vol 24 (supp01) ◽  
pp. 673-683
Author(s):  
Hai-Bo Li ◽  
Ya-Dong Yang
Keyword(s):  
New Physics ◽  
Charm Decays ◽  
Rare Charm

The following sections are included: Introduction Rare Charm Decays in the SM New Physics Analysis Summary

scholarly journals Impact of $$b \rightarrow s \ell \ell $$ anomalies on rare charm decays in non-universal $$Z'$$ models

2022 ◽  
Vol 82 (1) ◽  
Author(s):  
Ashutosh Kumar Alok ◽  
Neetu Raj Singh Chundawat ◽  
Dinesh Kumar
Keyword(s):  
New Physics ◽  
Tree Level ◽  
Long Distance ◽  
Charm Decays ◽  
Decay Modes ◽  
The Standard Model ◽  
Quark Level ◽  
Level Transition ◽  
The Impact ◽  
Rare Charm

AbstractIn this work, we study the impact of $$b \rightarrow s \ell \ell $$ b → s ℓ ℓ , $$B_s - \bar{B_s}$$ B s - B s ¯ mixing and neutrino trident measurements on observables in decays induced by $$c \rightarrow u $$ c → u transition in the context of a non-universal $$Z'$$ Z ′ model which generates $$C^{\mathrm{NP}}_{9} <0$$ C 9 NP < 0 and $$C^{\mathrm{NP}}_9 = - \,C^{\mathrm{NP}}_{10} $$ C 9 NP = - C 10 NP new physics scenarios at the tree level. We inspect the effects on $$D^0 \rightarrow \pi ^0 \nu {\bar{\nu }}$$ D 0 → π 0 ν ν ¯ , $$D^+ \rightarrow \pi ^+ \nu {\bar{\nu }}$$ D + → π + ν ν ¯ and $$B_c \rightarrow B^+ \nu {\bar{\nu }} $$ B c → B + ν ν ¯ decays which are induced by the quark level transition $$c \rightarrow u \nu {\bar{\nu }}$$ c → u ν ν ¯ . The fact that the branching ratios of these decays are negligible in the standard model (SM) and the long distance effects are relatively smaller in comparison to their charged dileptons counterparts, they are considered to provide genuine null-tests of SM. Therefore the observation of these modes at the level of current as well as planned experimental sensitivities would imply unambiguous signature of new physics. Using the constraints on $$Z'$$ Z ′ couplings coming from a combined fit to $$b \rightarrow s \ell \ell $$ b → s ℓ ℓ , $$\varDelta M_s$$ Δ M s and neutrino trident data, we find that any meaningful enhancement over the SM value is ruled out in the considered framework. The same is true for $$D - {\bar{D}}$$ D - D ¯ mixing observable $$\varDelta M_D$$ Δ M D along with $$D^0 \rightarrow \mu ^+ \mu ^-$$ D 0 → μ + μ - and $$D^+ \rightarrow \pi ^+ \mu ^+ \mu ^-$$ D + → π + μ + μ - decay modes which are induced through $$c \rightarrow u \mu ^+ \mu ^-$$ c → u μ + μ - transition.

scholarly journals Updated constraints on new physics in rare charm decays

2007 ◽  
Vol 76 (7) ◽  
Author(s):  
Svjetlana Fajfer ◽  
Nejc Košnik ◽  
Saša Prelovšek
Keyword(s):  
New Physics ◽  
Charm Decays ◽  
Rare Charm

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.

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.

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