scholarly journals Generic one-loop matching conditions for rare meson decays

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Fady Bishara ◽  
Joachim Brod ◽  
Martin Gorbahn ◽  
Ulserik Moldanazarova
Keyword(s):  
Standard Model ◽  
Flavour Changing Neutral Currents ◽  
Neutral Currents ◽  
Matching Conditions ◽  
Meson Decays ◽  
Effective Lagrangian ◽  
The Standard Model

Abstract Leptonic and semileptonic meson decays that proceed via flavour-changing neutral currents provide excellent probes of physics of the standard model and beyond. We present explicit results for the Wilson coefficients of the weak effective Lagrangian for these decays in any perturbative model in which these processes proceed via one-loop contributions. We explicitly show that our results are finite and gauge independent, and provide Mathematica code that implements our results in an easily usable form.

scholarly journals Long-distance QCD effects in FCNC B → γl+l- decays

2018 ◽  
Vol 192 ◽  
pp. 00031 ◽  
Author(s):  
Anastasiia Kozachuk ◽  
Dmitri Melikhov ◽  
Nikolai Nikitin
Keyword(s):  
Standard Model ◽  
Recent Work ◽  
Flavour Changing Neutral Currents ◽  
Neutral Currents ◽  
Long Distance ◽  
Leptonic Decays ◽  
The Standard Model

This presentation reviews the main results of our recent work [1] on rare radiative leptonic decays Bd,s → γμ+μ- and Bd,s → γe+e- induced by flavour-changing neutral currents (FCNC) in the Standard Model.

scholarly journals Charming loops in exclusive rare FCNC B-decays

2019 ◽  
Vol 222 ◽  
pp. 01007 ◽  
Author(s):  
Dmitri Melikhov
Keyword(s):  
Standard Model ◽  
Gain Control ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Reliable Control ◽  
B Decays ◽  
Flavour Changing Neutral Currents ◽  
Neutral Currents ◽  
The Standard Model ◽  
Theoretical Predictions

Rare B-decays induced by flavour-changing neutral currents (FCNC) is one of the promising candidates for probing physics beyond the Standard model. However, for identifying potential new physics from the data, reliable control over QCD contributions is necessary. We focus on one of such QCD contributions – the charming loops – that potentially can lead to difficulties in disentangling new physics effects from the observable and discuss the possibility to gain control over theoretical predictions for charming loops.

Flavour-changing neutral currents making and breaking the standard model

Nature ◽  
2017 ◽  
Vol 546 (7657) ◽  
pp. 221-226 ◽  
Author(s):  
F. Archilli ◽  
M.-O. Bettler ◽  
P. Owen ◽  
K. A. Petridis
Keyword(s):  
Standard Model ◽  
Flavour Changing Neutral Currents ◽  
Neutral Currents ◽  
The Standard Model

scholarly journals THE HIGGS PENGUIN AND ITS APPLICATIONS: AN OVERVIEW

2003 ◽  
Vol 18 (37) ◽  
pp. 2627-2644 ◽  
Author(s):  
ATHANASIOS DEDES
Keyword(s):  
Standard Model ◽  
B Meson ◽  
Higgs Sector ◽  
Complete List ◽  
Supersymmetric Extension ◽  
B Meson Decays ◽  
Meson Decays ◽  
Effective Lagrangian ◽  
The Standard Model ◽  
Minimal Supersymmetric Extension

We review the effective Lagrangian of the Higgs penguin in the Standard Model and its minimal supersymmetric extension (MSSM). As a master application of the Higgs penguin, we discuss in some detail the B-meson decays into a lepton–antilepton pair. Furthermore, we explain how this can probe the Higgs sector of the MSSM provided that some of these decays are seen at Tevatron Run II and B-factories. Finally, we present a complete list of observables where the Higgs penguin could be strongly involved.

TECHNIDILATON OR HIGGS?

1993 ◽  
Vol 08 (03) ◽  
pp. 275-283 ◽  
Author(s):  
EDI HALYO
Keyword(s):  
Standard Model ◽  
Energy Momentum Tensor ◽  
Momentum Tensor ◽  
Higgs Bosons ◽  
Low Energy ◽  
Gauge Bosons ◽  
Effective Lagrangian ◽  
The Standard Model

Interactions of the technidilaton with fermions and gauge bosons are obtained by constructing a low energy effective Lagrangian and using the fact that the technidilaton couples to the trace of the energy-momentum tensor Θµµ. Technidilaton’s interactions are compared with those of the Higgs bosons of the Standard Model with one or two scalar doublets.

scholarly journals Pentaquarks and possible anomalies at LHCb

2016 ◽  
Vol 31 (20n21) ◽  
pp. 1630032
Author(s):  
G. Lafferty
Keyword(s):  
Matrix Element ◽  
Standard Model ◽  
Meson Decay ◽  
Flavour Changing Neutral Currents ◽  
Neutral Currents ◽  
Ckm Matrix ◽  
Lhcb Experiment ◽  
Decay Modes ◽  
Model Predictions ◽  
Lepton Flavour

With the LHC Run 1 data, the LHCb experiment discovered two pentaquark states and has evidence for a number of possible anomalies in the flavour sector. The possible anomalies include indications of violations of lepton flavour universality, deviations from Standard Model predictions in several [Formula: see text]-meson decay modes that are mediated by flavour-changing neutral currents, and further evidence for a discrepancy between inclusive and exclusive measurements of the CKM matrix element [Formula: see text].

scholarly journals STUDY OF RADIATIVE LEPTONIC D MESON DECAYS

2000 ◽  
Vol 15 (34) ◽  
pp. 2087-2103 ◽  
Author(s):  
C. Q. GENG ◽  
C. C. LIH ◽  
WEI-MIN ZHANG
Keyword(s):  
Standard Model ◽  
Quark Model ◽  
D Meson ◽  
Branching Ratios ◽  
Light Front ◽  
Meson Decays ◽  
The Standard Model

We study the radiative leptonic D meson decays of [Formula: see text], [Formula: see text] and D0→ l+l-γ (l=e, μ) within the light front quark model. In the standard model, we find that the decay branching ratios of [Formula: see text], [Formula: see text] and [Formula: see text] are 6.9×10-6 (7.7×10-5), 2.5×10-5 (2.6×10-4), and 6.0×10-6 (3.2×10-4), and that of D0→l+l-γ (l=e, μ) and [Formula: see text] are 6.3×10-11 and 2.7×10-16, respectively.

scholarly journals A VERTEX-STRUCTURE MODEL FOR NEW DIRECT CP-VIOLATING EFFECTS IN $\bar B^0(B^0)\to\phi K_{\rm S}$ AND IN B∓→π∓η′(η)

2006 ◽  
Vol 21 (36) ◽  
pp. 2729-2737
Author(s):  
SAUL BARSHAY ◽  
GEORG KREYERHOFF
Keyword(s):  
Standard Model ◽  
Structure Model ◽  
Lagrangian Models ◽  
Effective Lagrangian ◽  
S Parameter ◽  
The Standard Model

We consider effective Lagrangian models of CP-violating vertex structure in which a b→uW vertex, proportional to s13e-iδ13 with s13 very small (milliweak interaction) and δ13 large, is dynamically generated. A consequent, enhanced CP-violating vertex for b→sg results in an enhanced CP-violating phase in the ratio of amplitudes for [Formula: see text]. We estimate that this can significantly change the S-parameter from the value expected in the standard model.

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