scholarly journals Proton decay and new contribution to 0ν2β decay in SO(10) with low-mass Z′ boson, observable n − n ¯ $$ n-\overline{n} $$ oscillation, lepton flavor violation, and rare kaon decay

2015 ◽  
Vol 2015 (1) ◽  
Author(s):  
M. K. Parida ◽  
Ram Lal Awasthi ◽  
P. K. Sahu
Keyword(s):  
Z Boson ◽  
Proton Decay ◽  
Lepton Flavor Violation ◽  
Kaon Decay ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Low Mass

scholarly journals Lepton Flavor Violation at muon-electron colliders

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Fabio Bossi ◽  
Paolo Ciafaloni
Keyword(s):  
Gauge Symmetry ◽  
Standard Model ◽  
Z Boson ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Lepton Flavor Violation ◽  
Foreseeable Future ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
The Standard Model

Abstract Lepton Flavor Violating (LFV) processes are clear signals of physics beyond the Standard Model. We investigate the possibility of measuring this kind of processes at present and foreseeable future muon-electron colliders, taking into account present day bounds from existing experiments. As a model of new physics we consider a Z’ boson with a Ut(1) gauge symmetry and generic couplings. Processes that violate lepton flavor by two units seem to be particularly promising.

Results from the B-factories review

2014 ◽  
Vol 29 (22) ◽  
pp. 1430048
Author(s):  
J. Michael Roney
Keyword(s):  
Cross Sections ◽  
Branching Fraction ◽  
Branching Ratios ◽  
Higgs Bosons ◽  
Lepton Flavor Violation ◽  
Muon Anomalous Magnetic Moment ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
T Violation ◽  
Low Mass

Following an introduction to the two e+e- B-factories, a sample of recent results from Belle and BABAR will be reported. This review will summarize results on the CKM unitarity angles and sides, the first direct observation of T-violation, measurements of the branching fraction of B- → τ-ντ and branching ratios of BF(B- → D(*)τ-ντ)/BF(B- → D(*)ℓ- νℓ), searches for low mass CP-odd Higgs bosons, lepton flavor violation in τ decays, and a precision measurement of the e+e- → K+K-(γ) cross-sections, and its impact on the hadronic vacuum polarization contribution to the theoretical calculation of the muon anomalous magnetic moment. Prospects for the future will be touched on.

scholarly journals Search for Lepton-Flavor Violation in Z -Boson Decays with τ Leptons with the ATLAS Detector

2021 ◽  
Vol 127 (27) ◽  
Author(s):  
G. Aad ◽  
B. Abbott ◽  
D. C. Abbott ◽  
A. Abed Abud ◽  
K. Abeling ◽  
...  
Keyword(s):  
Z Boson ◽  
Atlas Detector ◽  
Lepton Flavor Violation ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Z Boson Decays

scholarly journals Charged lepton flavor violation at the EIC

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Vincenzo Cirigliano ◽  
Kaori Fuyuto ◽  
Christopher Lee ◽  
Emanuele Mereghetti ◽  
Bin Yan
Keyword(s):  
Cross Sections ◽  
Charged Lepton ◽  
Hadron Collider ◽  
Effective Field ◽  
Background Suppression ◽  
Lepton Flavor Violation ◽  
Final State ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Discovery Potential

Abstract We present a comprehensive analysis of the potential sensitivity of the Electron-Ion Collider (EIC) to charged lepton flavor violation (CLFV) in the channel ep→τX, within the model-independent framework of the Standard Model Effective Field Theory (SMEFT). We compute the relevant cross sections to leading order in QCD and electroweak corrections and perform simulations of signal and SM background events in various τ decay channels, suggesting simple cuts to enhance the associated estimated efficiencies. To assess the discovery potential of the EIC in τ-e transitions, we study the sensitivity of other probes of this physics across a broad range of energy scales, from pp→eτX at the Large Hadron Collider to decays of B mesons and τ leptons, such as τ→eγ, τ→eℓ+ℓ−, and crucially the hadronic modes τ→eY with Y∈π, K, ππ, Kπ, …. We find that electroweak dipole and four-fermion semi-leptonic operators involving light quarks are already strongly constrained by τ decays, while operators involving the c and b quarks present more promising discovery potential for the EIC. An analysis of three models of leptoquarks confirms the expectations based on the SMEFT results. We also identify future directions needed to maximize the reach of the EIC in CLFV searches: these include an optimization of the τ tagger in hadronic channels, an exploration of background suppression through tagging b and c jets in the final state, and a global fit by turning on all SMEFT couplings, which will likely reveal new discovery windows for the EIC.

scholarly journals Lepton flavor violation and leptogenesis in discrete flavor symmetric scotogenic model

2021 ◽  
pp. 115472
Author(s):  
Bichitra Bijay Boruah ◽  
Lavina Sarma ◽  
Mrinal Kumar Das
Keyword(s):  
Lepton Flavor Violation ◽  
Lepton Flavor ◽  
Flavor Violation

scholarly journals Searching for charged lepton flavor violation at ep colliders

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Stefan Antusch ◽  
A. Hammad ◽  
Ahmed Rashed
Keyword(s):  
Standard Model ◽  
Charged Lepton ◽  
Neutral Current ◽  
Effective Theory ◽  
Theory Approach ◽  
Lepton Flavor Violation ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
The Standard Model ◽  
Order Of Magnitude

Abstract We investigate the sensitivity of electron-proton (ep) colliders for charged lepton flavor violation (cLFV) in an effective theory approach, considering a general effective Lagrangian for the conversion of an electron into a muon or a tau via the effective coupling to a neutral gauge boson or a neutral scalar field. For the photon, the Z boson and the Higgs particle of the Standard Model, we present the sensitivities of the LHeC for the coefficients of the effective operators, calculated from an analysis at the reconstructed level. As an example model where such flavor changing neutral current (FCNC) operators are generated at loop level, we consider the extension of the Standard Model by sterile neutrinos. We show that the LHeC could already probe the LFV conversion of an electron into a muon beyond the current experimental bounds, and could reach more than an order of magnitude higher sensitivity than the present limits for LFV conversion of an electron into a tau. We discuss that the high sensitivities are possible because the converted charged lepton is dominantly emitted in the backward direction, enabling an efficient separation of the signal from the background.

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