scholarly journals Measurement of $$ {D}^0-\overline{D} $$0 Mixing Parameters Using Semileptonic Decays of Neutral Kaon

2020 ◽  
Vol 2020 (2) ◽  
Author(s):  
P. Pakhlov ◽  
V. Popov
Keyword(s):  
Semileptonic Decays ◽  
Neutral Kaon ◽  
Mixing Parameters

scholarly journals Averages of b-hadron, c-hadron, and $$\tau $$-lepton properties as of 2018

2021 ◽  
Vol 81 (3) ◽  
Author(s):  
Y. Amhis ◽  
Sw. Banerjee ◽  
E. Ben-Haim ◽  
F. U. Bernlochner ◽  
M. Bona ◽  
...  
Keyword(s):  
Branching Fractions ◽  
Semileptonic Decays ◽  
Tau Lepton ◽  
Neutral Meson ◽  
Matrix Elements ◽  
Common Input ◽  
Common Values ◽  
Mixing Parameters ◽  
Input Parameters ◽  
Meson Mixing

AbstractThis paper reports world averages of measurements of b-hadron, c-hadron, and $$\tau $$ τ -lepton properties obtained by the Heavy Flavour Averaging Group using results available through September 2018. In rare cases, significant results obtained several months later are also used. For the averaging, common input parameters used in the various analyses are adjusted (rescaled) to common values, and known correlations are taken into account. The averages include branching fractions, lifetimes, neutral meson mixing parameters, $$C\!P$$ C P  violation parameters, parameters of semileptonic decays, and Cabibbo–Kobayashi–Maskawa matrix elements.

scholarly journals QED corrections in $$ \overline{B}\to \overline{K}{\mathrm{\ell}}^{+}{\mathrm{\ell}}^{-} $$ at the double-differential level

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Gino Isidori ◽  
Saad Nabeebaccus ◽  
Roman Zwicky
Keyword(s):  
Phase Space ◽  
Detailed Analysis ◽  
Invariant Mass ◽  
Mass Distribution ◽  
Invariant Mass Distribution ◽  
Semileptonic Decays ◽  
Lepton Pair ◽  
Specific Choice ◽  
Slicing Method

Abstract We present a detailed analysis of QED corrections to $$ \overline{B}\to \overline{K}{\mathrm{\ell}}^{+}{\mathrm{\ell}}^{-} $$ B ¯ → K ¯ ℓ + ℓ − decays at the double-differential level. Cancellations of soft and collinear divergences are demonstrated analytically using the phase space slicing method. Whereas soft divergences are found to cancel at the differential level, the cancellation of the hard-collinear logs ln mℓ require, besides photon-inclusiveness, a specific choice of kinematic variables. In particular, hard-collinear logs in the lepton-pair invariant mass distribution (q2), are sizeable and need to be treated with care when comparing with experiment. Virtual and real amplitudes are evaluated using an effective mesonic Lagrangian. Crucially, we show that going beyond this approximation does not introduce any further infrared sensitive terms. All analytic computations are performed for generic charges and are therefore adaptable to semileptonic decays such as $$ \overline{B}\to D\mathrm{\ell}\overline{\nu } $$ B ¯ → D ℓ ν ¯ .

scholarly journals Lattice QCD calculation of the electroweak box diagrams for the kaon semileptonic decays

2021 ◽  
Vol 103 (11) ◽  
Author(s):  
Peng-Xiang Ma ◽  
Xu Feng ◽  
Mikhail Gorchtein ◽  
Lu-Chang Jin ◽  
Chien-Yeah Seng
Keyword(s):  
Lattice Qcd ◽  
Semileptonic Decays

scholarly journals Experimental study of the $ \gamma p \rightarrow K^{0}\Sigma^{+}$, $ \gamma n \rightarrow K^{0} \Lambda$, and $ \gamma n \rightarrow K^{0} \Sigma^{0}$ reactions at the Mainz Microtron

2019 ◽  
Vol 55 (11) ◽  
Author(s):  
C. S. Akondi ◽  
K. Bantawa ◽  
D. M. Manley ◽  
S. Abt ◽  
P. Achenbach ◽  
...  
Keyword(s):  
Experimental Study ◽  
Cross Sections ◽  
Differential Cross ◽  
Legendre Polynomials ◽  
Neutral Kaon ◽  
Experimental Results ◽  
Differential Cross Sections ◽  
Theoretical Predictions ◽  
Photoproduction Reactions ◽  
Insight Into

Abstract.This work measured $ \mathrm{d}\sigma/\mathrm{d}\Omega$dσ/dΩ for neutral kaon photoproduction reactions from threshold up to a c.m. energy of 1855MeV, focussing specifically on the $ \gamma p\rightarrow K^0\Sigma^+$γp→K0Σ+, $ \gamma n\rightarrow K^0\Lambda$γn→K0Λ, and $ \gamma n\rightarrow K^0 \Sigma^0$γn→K0Σ0 reactions. Our results for $ \gamma n\rightarrow K^0 \Sigma^0$γn→K0Σ0 are the first-ever measurements for that reaction. These data will provide insight into the properties of $ N^{\ast}$N* resonances and, in particular, will lead to an improved knowledge about those states that couple only weakly to the $ \pi N$πN channel. Integrated cross sections were extracted by fitting the differential cross sections for each reaction as a series of Legendre polynomials and our results are compared with prior experimental results and theoretical predictions.

Semileptonic Decays of Heavy Baryons

2020 ◽  
Vol 51 (4) ◽  
pp. 625-631
Author(s):  
V. O. Galkin ◽  
R. N. Faustov
Keyword(s):  
Semileptonic Decays ◽  
Heavy Baryons
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