SEARCH FOR KL→π0μ±e∓

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 651-653
Author(s):  
◽  
ANGELA BELLAVANCE
Keyword(s):  
Branching Ratio ◽  
Kaon Decays ◽  
Lepton Flavor ◽  
Ratio Limit

The KTeV experiment (Kaons at the TeVatron) at Fermilab studies CP violating and other rare kaon decays, including the search for the lepton-flavor violating mode KL→π0μ±e∓. KTeV has obtained a new, preliminary branching ratio limit of BR(KL→π0μ±e∓)<4.40×10-10.

Study of the semileptonic Bc → ηcτ−v̄τ decay in W′ model

2021 ◽  
Author(s):  
S. Mahata ◽  
P. Maji ◽  
S. Biswas ◽  
S. Sahoo
Keyword(s):  
Standard Model ◽  
Branching Ratio ◽  
New Physics ◽  
Experimental Results ◽  
Lepton Flavor ◽  
The Standard Model ◽  
Text Model

Recently, many discrepancies between the Standard Model (SM) predictions and experimental results have been found in [Formula: see text] quark transitions. Motivated by these discrepancies, we investigated the semileptonic [Formula: see text] decay in [Formula: see text] model. In this paper, we have estimated different decay observables such as branching ratio, lepton flavor universality (LFU) ratio [Formula: see text] and forward–backward asymmetry in the SM as well as in the [Formula: see text] model. In [Formula: see text] model, we find significant deviations from the SM for the observables except for the forward–backward asymmetry. This deviation gives us a possible indication of new physics (NP).

scholarly journals LEPTON FLAVOR VIOLATION IN INVERSE SEESAW MODEL

2013 ◽  
Vol 28 (38) ◽  
pp. 1350151 ◽  
Author(s):  
KE-SHENG SUN ◽  
TAI-FU FENG ◽  
GUO-HUI LUO ◽  
XIU-YI YANG ◽  
JIAN-BIN CHEN
Keyword(s):  
Large Scale ◽  
Branching Ratio ◽  
Mass Term ◽  
Lepton Flavor Violation ◽  
Neutrino Mixing ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Conversion Rates ◽  
Upper Limits ◽  
Wide Range

We analyze the lepton flavor violation processes μ-e conversion, li→ljγ and li→3lj in framework of the Standard Model (SM) extended with inverse seesaw mechanism, as a function of [Formula: see text] that parametrizes the departure from unitary of the light neutrino mixing sub-matrix [Formula: see text]. In a wide range of [Formula: see text], the predictions on the μ-e conversion rates and the branching ratio of μ→eγ are sizeable to be compatible with the experimental upper limits or future experimental sensitivities. For large scale of [Formula: see text], the predictions on branching ratios of other lepton flavor processes can also reach the experimental upper limits or future experimental sensitivities. The value of [Formula: see text] depends on the determinant of the Majorana mass term Mμ. Finally, searching for lepton flavor violation processes in experiment provides us more opportunities for the searches of seesaw nature of the neutrino masses.

Calculation of the Branching Ratio of the Process μ→ 3e in the Hung Model

2012 ◽  
Vol 490-495 ◽  
pp. 315-318
Author(s):  
Jian Ping Bu ◽  
Bei Jia
Keyword(s):  
Neutrino Mass ◽  
Neutrino Oscillations ◽  
Branching Ratio ◽  
Branching Ratios ◽  
Electroweak Scale ◽  
Seesaw Mechanism ◽  
Lepton Flavor ◽  
Flavor Structure

Rich phenomenology is generally expected if the heavy neutrinos responsible via the seesaw mechanism for the small neutrino mass observed in neutrino oscillations are not much heavier than the electroweak scale. A model with this feature built in has been suggested recently by Hung. We analyze the lepton flavor structure in gauge interactions and calculate the branching ratios for the decays due to the gauge interactions in this model.

scholarly journals Lepton flavor violating $$\Lambda _b\rightarrow \Lambda \ell _1\ell _2$$ decay

2019 ◽  
Vol 79 (12) ◽  
Author(s):  
Diganta Das
Keyword(s):  
Standard Model ◽  
Parameter Space ◽  
Axial Vector ◽  
Branching Ratio ◽  
Low Energy ◽  
Effective Hamiltonian ◽  
Decay Distribution ◽  
Lepton Flavor ◽  
The Standard Model ◽  
Pseudo Scalar

AbstractInspired by the recent hints of lepton flavor universality violation in $$b\rightarrow s\ell \ell $$b→sℓℓ and $$b\rightarrow c\ell \nu $$b→cℓν transitions, we study lepton flavor violating exclusive $$\Lambda _b\rightarrow \Lambda \ell _1^+\ell _2^-$$Λb→Λℓ1+ℓ2- ($$\ell _1\ne \ell _2$$ℓ1≠ℓ2) decay, which is forbidden in the Standard Model. Starting from a general effective Hamiltonian for a $$b\rightarrow s\ell _1^+\ell _2^-$$b→sℓ1+ℓ2- transition that includes vector and axial-vector operators, and scalar and pseudo-scalar operators, we derive a two-fold decay distribution of $$\Lambda _b\rightarrow \Lambda \ell _1^+\ell _2^-$$Λb→Λℓ1+ℓ2-. The distribution helps us to construct the differential branching ratio and the lepton-side forward–backward asymmetry, which are studied in a vector leptoquark model. The parameter space of the vector leptoquark model is constrained by low energy observables.

scholarly journals Lepton-flavor-violating decays of the SM-like Higgs boson $h\rightarrow e_ie_j$, and $e_i \rightarrow e_j\, \gamma $ in a flipped 3-3-1 model

2020 ◽  
Vol 2020 (4) ◽  
Author(s):  
T T Hong ◽  
H T Hung ◽  
H H Phuong ◽  
L T T Phuong ◽  
L T Hue
Keyword(s):  
Higgs Boson ◽  
Branching Ratio ◽  
High Energy ◽  
Branching Ratios ◽  
The Other ◽  
Experimental Limit ◽  
Lepton Flavor ◽  
The Standard Model ◽  
Charged Leptons ◽  
O 10

Abstract In the framework of the flipped 3-3-1 model introduced recently [R. M. Fonseca and M. Hirsch, J. High Energy Phys. 1608, 003 (2016)], the lepton-flavor-violating (LFV) decay $\mu \rightarrow 3e$ was predicted to have a large branching ratio (Br) close to the recent experimental limit. We will show that the Br of LFV decays of the standard-model-like (SM-like) Higgs boson decays (LFVHD) Br$(h\rightarrow e_ae_b)$ may also be large. Namely, Br$(h\rightarrow \mu\tau,e\tau)$ can reach values of $\mathcal{O}(10^{-4}){-}\mathcal{O}(10^{-5})$, which will reach the upcoming experimental sensitivities. On the other hand, for LFV decays of charged leptons (cLFV) $(e_b\rightarrow e_a\gamma)$, the branching ratios are well below experimental bounds.

scholarly journals LEPTON FLAVOR VIOLATING DECAY $Z\to\ell^\pm_i\ell^\mp_j$ IN THE 331 MODEL

2011 ◽  
Vol 26 (24) ◽  
pp. 4171-4185 ◽  
Author(s):  
I. CORTÉS-MALDONADO ◽  
A. MOYOTL ◽  
G. TAVARES-VELASCO
Keyword(s):  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Branching Ratio ◽  
Branching Ratios ◽  
Lepton Flavor ◽  
Loop Level ◽  
Current Limit ◽  
Z Decays ◽  
The One ◽  
Doubly Charged

We study the lepton flavor violating (LFV) decays [Formula: see text](ℓi,j = e,μ,τ) in the framework of the minimal 331 model. The main contributions arise at the one-loop level via a doubly charged bilepton with general LFV couplings. We obtain an estimate for the corresponding branching ratios by using the bounds on the LFV couplings of the doubly charged bilepton from the current experimental limits on the decays ℓi → ℓjγ and [Formula: see text]. A bound on the bilepton mass is also obtained through the current limit on the anomalous magnetic moment of the muon. It is found that the bilepton contributions to LFV Z decays are not expected to be at the reach of experimental detection. In particular, the branching ratio for the Z → μ±τ∓ decay is below the 10-10 level for a bilepton mass of the order of 500 GeV.

Calculation of the Branching Ratio of the Process μ→eγ in a Model of Electroweak-Scale Right-Handed Neutrinos

2012 ◽  
Vol 490-495 ◽  
pp. 152-156
Author(s):  
Jian Ping Bu ◽  
Bei Jia
Keyword(s):  
Neutrino Mass ◽  
Rare Decays ◽  
Neutrino Oscillations ◽  
Branching Ratio ◽  
Branching Ratios ◽  
Electroweak Scale ◽  
Seesaw Mechanism ◽  
Lepton Flavor ◽  
Flavor Structure

Rich phenomenology is generally expected if the heavy neutrinos responsible via the seesaw mechanism for the small neutrino mass observed in neutrino oscillations are not much heavier than the electroweak scale. A model with this feature built in has been suggested recently by Hung. We analyze the lepton flavor structure in gauge interactions and calculate the branching ratios for the rare decays due to the gauge interactions in this model.

scholarly journals Violation of lepton flavor and lepton flavor universality in rare kaon decays

2016 ◽  
Vol 93 (7) ◽  
Author(s):  
Andreas Crivellin ◽  
Giancarlo D’Ambrosio ◽  
Martin Hoferichter ◽  
Lewis C. Tunstall
Keyword(s):  
Kaon Decays ◽  
Lepton Flavor
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