Flavour–changing Neutral Currents

2015 ◽  
pp. 141-156
Keyword(s):  
Flavour Changing Neutral Currents ◽  
Neutral Currents

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.

A search for flavour-changing neutral currents in b decay at petra

1983 ◽  
Vol 132 (1-3) ◽  
pp. 241-245 ◽  
Author(s):  
W. Bartel ◽  
L. Becker ◽  
C.K. Bowdery ◽  
D. Cords ◽  
R. Eichler ◽  
...  
Keyword(s):  
Flavour Changing Neutral Currents ◽  
Neutral Currents

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 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 A three Higgs doublet model with symmetry-suppressed flavour changing neutral currents

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Dipankar Das ◽  
P. M. Ferreira ◽  
António P. Morais ◽  
Ian Padilla-Gay ◽  
Roman Pasechnik ◽  
...  
Keyword(s):  
Higgs Doublet ◽  
Higgs Bosons ◽  
Flavour Changing Neutral Currents ◽  
Neutral Currents ◽  
The Future ◽  
Future Collider ◽  
Doublet Model

Abstract We construct a three-Higgs doublet model with a flavour non-universal U(1) × ℤ2 symmetry. That symmetry induces suppressed flavour-changing interactions mediated by neutral scalars. New scalars with masses below the TeV scale can still successfully negotiate the constraints arising from flavour data. Such a model can thus encourage direct searches for extra Higgs bosons in the future collider experiments, and includes a non-trivial flavour structure.

Μελέτη των διασπάσεων αλλαγής γεύσης ουδετέρου ρεύματος του top κουάρκ στα πλαίσια του πειράματος CMS/LHC

2007 ◽  
Author(s):  
Γρηγόριος Βερμίσογλου
Keyword(s):  
Standard Model ◽  
Top Quark ◽  
Z Boson ◽  
New Physics ◽  
Flavour Changing Neutral Currents ◽  
Neutral Currents ◽  
Leptonic Decays ◽  
Quark Sector ◽  
Systematic Effects ◽  
Detector Simulation

This study contains the first realistic estimate for the CMS/LHC sensitivity to Flavour Changing Neutral Currents (FCNC) in the top quark sector. The non-Standard Model decays t→Zq and t→ γ q (where q = u, c) have been studied at √s = 14 TeV exploiting the leptonic decays of the Z⁰ boson and the photon. A realistic detector simulation has been used and the most important systematic effects have been addressed. The 5-sigma discovery limits for the two decays are BR(t→qZ)= 11.4 x 10⁻⁴ and BR(t→ γ q)= 5.7 x 10⁻⁴, allowing some models of new physics to be tested.

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