scholarly journals Theory of Deep-Inelastic Lepton-Nucleon Scattering and Lepton-Pair Annihilation Processes. I

1969 ◽  
Vol 187 (5) ◽  
pp. 2159-2171 ◽  
Author(s):  
SIDNEY D. DRELL ◽  
DONALD J. LEVY ◽  
TUNG-MOW YAN
Keyword(s):  
Lepton Pair ◽  
Nucleon Scattering ◽  
Pair Annihilation

Partial-wave analysis of lepton-pair annihilation into two photons

1986 ◽  
Vol 64 (10) ◽  
pp. 1359-1364 ◽  
Author(s):  
Winston Roberts
Keyword(s):  
Partial Wave ◽  
Cross Section ◽  
Quantum Electrodynamics ◽  
Negative Parity ◽  
Partial Cross Section ◽  
Lepton Pair ◽  
Partial Wave Analysis ◽  
Final States ◽  
Lepton Pairs ◽  
Pair Annihilation

The partial-wave (Jp) composition of the process ℓ+ℓ− → γγ is analyzed in lowest order quantum electrodynamics. The results for low-momentum leptons are as expected, the partial wave with Jp = 0− being dominant. At high energies, the partial wave with Jp = 2+ has the largest single partial cross section. At all energies, it is found that lepton pairs in the triplet state give rise exclusively to positive-parity final states, whereas pairs in the singlet state give rise to negative-parity final states.Some features of the differential cross section are also explained in terms of the spin state of the annihilating lepton pair. Possible implications for e+e− → γγ → hadrons and [Formula: see text] hadrons are briefly discussed.

scholarly journals Lepton-pair production in dipion τ lepton decays

2021 ◽  
Vol 103 (1) ◽  
Author(s):  
J. L. Gutiérrez Santiago ◽  
G. López Castro ◽  
P. Roig
Keyword(s):  
Pair Production ◽  
Lepton Pair ◽  
Lepton Pair Production ◽  
Lepton Decays
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