scholarly journals Search for flavor-changing neutral current and Lepton-flavor violating decays of D{sup 0} --> {ell}{sup +} {ell}{sup -}

2004 ◽  
Author(s):  
C Chen
Keyword(s):  
Neutral Current ◽  
Lepton Flavor ◽  
Flavor Changing ◽  
Flavor Changing Neutral Current

An investigation into the lepton flavor changing neutral current at a Z-factory

2010 ◽  
Vol 53 (11) ◽  
pp. 1957-1960
Author(s):  
XiaoPeng Li ◽  
Lei Guo ◽  
Liang Han ◽  
WenGan Ma ◽  
RenYou Zhang
Keyword(s):  
Neutral Current ◽  
Lepton Flavor ◽  
Flavor Changing ◽  
Flavor Changing Neutral Current

scholarly journals Study of electroweak penguin B decays at Belle II experiment

2021 ◽  
Vol 2145 (1) ◽  
pp. 012018
Author(s):  
J Ineead ◽  
S Nishida ◽  
B Asavapibhop ◽  
N Suwonjandee
Keyword(s):  
Branching Fraction ◽  
Neutral Current ◽  
New Physics ◽  
Lepton Flavor ◽  
Flavor Changing ◽  
Penguin Diagram ◽  
The Status ◽  
Flavor Changing Neutral Current ◽  
Belle Ii ◽  
Exclusive Decay

Abstract The electroweak b → sll (l = e, µ) transition is a flavor-changing neutral current process that mediates through a one-loop penguin diagram. The decay is considered to be a good probe for the New Physics as particles predicted in the beyond Standard Model theories can enter into the loop. The exclusive decay B → K (*) l + l − was first observed by the Belle experiment and it provides many observables such as the branching fraction, CP asymmetry, forward-backward asymmetry, and other angular observables. Recently, the LHCb experiment has reported some clue of a lepton flavor universality violation from the branching fraction ratio of the B → Kµ + µ − and B → Ke + e − decays. In this presentation, we report the status of the B → Kl + l − decay analysis at the Belle II experiment which started the data taking in 2019. We also, present an activity at the Belle II Chulalongkorn University group where we study the B → KJ/ψ decay which has the same topology as the B → Kl + l − .

scholarly journals Lepton flavor violating decays of B and K mesons in models with extended gauge group

2018 ◽  
Vol 33 (14n15) ◽  
pp. 1850087 ◽  
Author(s):  
Fayyazuddin ◽  
Muhammad Jamil Aslam ◽  
Cai-Dian Lu
Keyword(s):  
Gauge Group ◽  
Particle Physics ◽  
Neutral Current ◽  
Representation Formula ◽  
Decay Modes ◽  
Lepton Flavor ◽  
Flavor Changing ◽  
Effective Lagrangian ◽  
Flavor Changing Neutral Current ◽  
Promising Area

Lepton flavor violating (LFV) decays are forbidden in the Standard Model (SM) and to explore them one has to go beyond it. The flavor changing neutral current induced lepton flavor conserving and LFV decays of [Formula: see text] and [Formula: see text] mesons is discussed in the gauge group [Formula: see text]. The lepto-quark [Formula: see text] corresponding to gauge group [Formula: see text] allows the quark–lepton transitions and hence giving a framework to construct the effective Lagrangian for the LFV decays. The mass of lepto-quark [Formula: see text] provides a scale at which the gauge group [Formula: see text] is broken to the SM gauge group. Using the most stringent experimental limit [Formula: see text], the upper bound on the effective coupling constant [Formula: see text] is obtained for certain pairing of lepton and quark generations in the representation [Formula: see text] of the group [Formula: see text]. Later, the effective Lagrangian for the LFV meson decays for the gauge group [Formula: see text] is constructed. Using [Formula: see text], the bound on the ratio of effective couplings is obtained to be [Formula: see text]. A number of decay modes are discussed which provide a promising area to test this model in the current and future particle physics experiments.

Impact of Z′ boson on lepton flavor violating decays

2019 ◽  
Vol 34 (12) ◽  
pp. 1950068
Author(s):  
P. Maji ◽  
P. Nayek ◽  
S. Sahoo
Keyword(s):  
B Meson ◽  
Neutral Current ◽  
Branching Ratio ◽  
Test Theory ◽  
Decay Channels ◽  
Lepton Flavor ◽  
Flavor Changing ◽  
Flavor Changing Neutral Current ◽  
Text Model ◽  
Three Body

Recently, some small hints of lepton flavor violating (LFV) decays have been probed in different colliders and accelerators. Although these processes are forbidden in the Standard Model (SM), observation of LFV decays are considered as good probes to test theory beyond the SM. In this paper, we study some LFV decays, e.g. three-body decay channels of [Formula: see text] lepton like [Formula: see text], [Formula: see text] and two-body decays of B meson and [Formula: see text] lepton like [Formula: see text] and [Formula: see text] in [Formula: see text] model. We calculate the branching ratio of the above decays considering the effect of both [Formula: see text] and [Formula: see text]-mediated flavor-changing neutral-current (FCNC).

scholarly journals REVIEW OF RECENT SEARCHES FOR RARE AND FORBIDDEN DILEPTON DECAYS OF CHARMED MESONS

2000 ◽  
Vol 15 (22n23) ◽  
pp. 1399-1407 ◽  
Author(s):  
DAVID A. SANDERS
Keyword(s):  
D Mesons ◽  
Neutral Current ◽  
Lepton Number ◽  
Charmed Mesons ◽  
Decay Modes ◽  
Lepton Flavor ◽  
Flavor Changing ◽  
Flavor Changing Neutral Current ◽  
Primary Focus ◽  
Decays Of Charmed Mesons

I briefly review the results of recent searches for flavor-changing neutral current and lepton-flavor and lepton-number violating decays of D+, [Formula: see text] and D0 mesons (and their antiparticles) into modes containing muons and electrons. The primary focus is the results from Fermilab charm hadroproduction experiment E791. E791 examined 24 πℓℓ and Kℓℓ decay modes of D+ and [Formula: see text] and ℓ+ℓ- decay modes of D0. Limits presented by E791 for 22 rare and forbidden dilepton decays of D mesons were more stringent than those obtained from previous searches,1 or else were the first reported.

scholarly journals Status of rare exclusive B meson decays in 2018

2018 ◽  
Vol 33 (18n19) ◽  
pp. 1830016 ◽  
Author(s):  
Johannes Albrecht ◽  
Stefanie Reichert ◽  
Danny van Dyk
Keyword(s):  
B Meson ◽  
Experimental Situation ◽  
Neutral Current ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Lepton Flavor ◽  
Flavor Changing ◽  
Theoretical Status ◽  
Flavor Changing Neutral Current ◽  
B Quark

This review discusses the present experimental and theoretical status of rare flavor-changing neutral current b-quark decays at the beginning of 2018. It includes a discussion of the experimental situation and details of the currently observed anomalies in measurements of flavor observables, including lepton flavor universality. Progress on the theory side within and beyond the Standard Model theory is also discussed, together with potential New Physics interpretations of the present measurements.

scholarly journals Search for rare and forbidden decays of D0 → ℓ+ℓ-

2005 ◽  
Vol 20 (16) ◽  
pp. 3677-3679
Author(s):  
◽  
Chunhui Chen
Keyword(s):  
Confidence Level ◽  
Neutral Current ◽  
Branching Fractions ◽  
Lepton Flavor ◽  
Flavor Changing ◽  
Upper Limits ◽  
Flavor Changing Neutral Current ◽  
Babar Detector

We report on a search for the flavor-changing neutral current decays D0 → e+e- and D0 → μ+μ-, and the lepton-flavor violating decay D0 → e±μ∓. The measurement is based on 122 fb-1 of data collected by the BABAR detector at the PEP-II asymmetric e+e- collider. No evidence is found for any of the decays. The upper limits on the branching fractions, at the 90% confidence level, are 1.2 × 10-6 for D0 → e+e-, 1.3 × 10-6 for D0 → μ+μ-, and 8.1 × 10-7 for D0 → e±μ∓.

scholarly journals Search for Flavor-Changing Neutral Current and Lepton-Flavor Violating Decays ofD0→l+l−

2004 ◽  
Vol 93 (19) ◽  
Author(s):  
B. Aubert ◽  
R. Barate ◽  
D. Boutigny ◽  
F. Couderc ◽  
J.-M. Gaillard ◽  
...  
Keyword(s):  
Neutral Current ◽  
Lepton Flavor ◽  
Flavor Changing ◽  
Flavor Changing Neutral Current
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