RADIATIVE LEPTONIC DECAY OF Ds AND D MESONS

2009 ◽  
Vol 24 (12) ◽  
pp. 2335-2355 ◽  
Author(s):  
N. BARIK ◽  
SK. NAIMUDDIN ◽  
P. C. DASH
Keyword(s):  
Photon Energy ◽  
D Mesons ◽  
Branching Ratios ◽  
Energy Spectra ◽  
Tree Level ◽  
Harmonic Form ◽  
Mass Limit ◽  
Internal Bremsstrahlung ◽  
Leptonic Decays ◽  
Peak Value

The radiative leptonic decays Ds → μνμγ and D → μνμγ are investigated at the tree level within the relativistic independent quark model based on the confining potential in the scalar–vector harmonic form. The branching ratios for these decays in the vanishing lepton mass limit are obtained as ℬr(Ds → μνμγ) = 4.94×10-4 and ℬr(D → μνμγ) = 3.34×10-5, which includes the contributions of the internal bremsstrahlung and structure dependent diagrams at the level of the quark constituents. Finally, the photon energy spectra as predicted here is found to be symmetric about the peak value of the photon energy at [Formula: see text].

scholarly journals Study of the leptonic decays of pseudoscalarB,Dand vectorB*,D*mesons and of the semileptonicB→DandB→D*decays

2005 ◽  
Vol 71 (11) ◽  
Author(s):  
C. Albertus ◽  
E. Hernández ◽  
J. Nieves ◽  
J. M. Verde-Velasco
Keyword(s):  
D Mesons ◽  
Leptonic Decays

scholarly journals Photon energy spectra in the vicinity of nuclear reactors.

1978 ◽  
Vol 13 (3) ◽  
pp. 183-191 ◽  
Author(s):  
Yoshiyuki NAKASHIMA ◽  
Kousuke KATSURAYAMA ◽  
Tadashi TSUJIMOTO ◽  
Susumu MINATO
Keyword(s):  
Photon Energy ◽  
Nuclear Reactors ◽  
Energy Spectra

scholarly journals Testing lepton flavour universality with (semi)-leptonic $$\varvec{D_{(s)}}$$ decays

2020 ◽  
Vol 80 (2) ◽  
Author(s):  
Robert Fleischer ◽  
Ruben Jaarsma ◽  
Gabriël Koole
Keyword(s):  
Standard Model ◽  
Branching Ratios ◽  
Current Data ◽  
Leptonic Decays ◽  
Independent Analysis ◽  
The Standard Model ◽  
Model Independent ◽  
Pseudo Scalar ◽  
The Impact ◽  
Lepton Flavour

Abstract Data in B-meson decays indicate violations of lepton flavour universality, thereby raising the question about such phenomena in the charm sector. We perform a model-independent analysis of NP contributions in (semi)-leptonic decays of $$D_{(s)}$$D(s) mesons which originate from $$c \rightarrow d \bar{{\ell }} \nu _l$$c→dℓ¯νl and $$c \rightarrow s \bar{{\ell }} \nu _{\ell }$$c→sℓ¯νℓ charged-current interactions. Starting from the most general low-energy effective Hamiltonian containing four-fermion operators and the corresponding short-distance coefficients, we explore the impact of new (pseudo)-scalar, vector and tensor operators and constrain their effects through the interplay with current data. We pay special attention to the elements $$|V_{cd}|$$|Vcd| and $$|V_{cs}|$$|Vcs| of the Cabibbo–Kobayashi–Maskawa matrix and extract them from the $$D_{(s)}$$D(s) decays in the presence of possible NP decay contributions, comparing them with determinations utilizing unitarity. We find a picture in agreement with the Standard Model within the current uncertainties. Using the results from our analysis, we make also predictions for leptonic $$D_{(s)}^+ \rightarrow e^+ \nu _e$$D(s)+→e+νe modes which could be hugely enhanced with respect to their tiny Standard Model branching ratios. It will be interesting to apply our strategy at the future high-precision frontier.

SU-FF-T-155: Derivation of Photon Energy Spectra From Transmission Measurements Using Large Fields

2006 ◽  
Vol 33 (6Part9) ◽  
pp. 2084-2084
Author(s):  
E Nes ◽  
C Esquivel ◽  
R Waggener
Keyword(s):  
Photon Energy ◽  
Energy Spectra ◽  
Transmission Measurements

scholarly journals Radiative leptonic decays of Ds± and D± mesons

2003 ◽  
Vol 562 (1-2) ◽  
pp. 75-80 ◽  
Author(s):  
Cai-Dian Lü ◽  
Ge-Liang Song
Keyword(s):  
D Mesons ◽  
Leptonic Decays

scholarly journals Leptonic decay constants for D-mesons from 3-flavour CLS ensembles

2018 ◽  
Vol 175 ◽  
pp. 13019
Author(s):  
Sara Collins ◽  
Kevin Eckert ◽  
Jochen Heitger ◽  
Stefan Hofmann ◽  
Wolfgang Söldner
Keyword(s):  
Large Volume ◽  
D Mesons ◽  
Leptonic Decay ◽  
Tree Level ◽  
Open Boundary ◽  
Open Boundary Conditions ◽  
Gauge Action ◽  
Decay Constants ◽  
Ongoing Effort ◽  
The Status

e report on the status of an ongoing effort by the RQCD and ALPHA Collaborations, aimed at determining leptonic decay constants of charmed mesons. Our analysis is based on large-volume ensembles generated within the CLS effort, employing Nf = 2 + 1 non-perturbatively O(a) improved Wilson quarks, tree-level Symanzik-improved gauge action and open boundary conditions. The ensembles cover lattice spac-ings from a ≈ 0.09 fm to a ≈ 0.05 fm, with pion masses varied from 420 to 200 MeV. To extrapolate to the physical masses, we follow both the (2ml + ms) = const. and the ms = const. lines in parameter space.

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