pair production


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Related to pair production: photodisintegration

pair production

The conversion of a high-energy (>1.022 MeV) gamma-ray photon, usually in the field of an atomic nucleus, into an electron and positron, which are formed simultaneously. See also annihilation; photon-photon absorption.

pair production

[′per prə‚dək·shən]
(physics)
The conversion of a photon into an electron and a positron when the photon traverses a strong electric field, such as that surrounding a nucleus or an electron.
References in periodicals archive ?
Therefore, with the lepton formation and quark-antiquark pair production model developed in this paper, we can understand the recent measurement of a tau particle in a muon neutrino beam as well as the early measurements of muon particles in electron neutrino beams.
This paper develops a quark-antiquark annihilation and pair production model to explain the formation of leptons and the oscillation of neutrinos and further predict the fourth generation of leptons named as lambda particle and neutrino.
We can see that the top partner pair production cross sections increase abruptly at threshold and reach a maximum roughly 200 GeV above threshold.
We will explore the sensitivity of T-odd top partner pair production with unpolarized beam through the channel
In summarizing the results, we can conclude that, for the charged Higgs searches, the most suitable channel from cross section point of view is charged Higgs pair production having largest cross section of the order of few fb in MSSM and 2HDM, while the selected triple Higgs processes ([H.sup.+] [H.sup.-] [H.sup.0], [H.sup.+] [H.sup.-] [h.sup.0]) have very tiny cross sections.
Hashemi, "Charged higgs pair production in a general two higgs doublet model at e+e- and [mu]+[mu]- linear colliders," Communications in Theoretical Physics, vol.
For two tardyonic ("normal") particles of mass [m.sub.e], pair production threshold is reached when the pair is emitted collinearly, with two four-vectors [p.sup.[mu]] = (E, [??]) = ([E.sub.1], [[??].sub.1]) = ([E.sub.2], [[??].sub.2]) that fulfill
There is thus no lower threshold for tachyonic pair production, expressed in [q.sup.2].
In summary, in this section we concentrated on the channel of top pair production where both top quarks decay anomalously into two jets.
So far, we have examined the future [e.sup.-][e.sup.+] collider potential to probe the anomalous tqg in the decay of the top quark in top pair production. At hadron colliders, the anomalous tqg couplings can be probed either in top production or top decay.
If the 2s level is excited, pair production dominates over the two-photon channel in the deexcitation, because electrons are much lighter than helium nuclei, and positron production is not accompanied by a strong gamma-ray signal.
As [e.sup.+][e.sup.-] pair production is the only possible channel, the differential pair-production cross-section d[[sigma].sub.ee] is equal to the differential collisional excitation cross-section.