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Lepton pair production

As we have mentioned above it is possible to evaluate the electromagnetic lepton pair production in the limiting case of infinite Lorentz factors y. One interesting aspect among others is that peripheral heavy-ion collisions at ultrarelativistic energies offer... [Pg.23]

A number of other studies are presently under way. For instance, asymmetries due to 7 - Z interference can be studied in much the same way as in the case of lepton pair production which was considered in detail in Section 8.5. [Pg.297]

From the previous discussion, we would expect the heavy lepton mass to be around 1.8-2.0 GeV, i.e. extremely close to the mass of the charm meson. That there are no heavy leptons with mass <1.5 GeV has been established (Bernardini et al., 1973 Zichichi, 1977) by earlier experimental searches. The cross-section for lepton pair production, within QED, 7 T+T , assuming point-like spin particles, is given by... [Pg.301]

We have mentioned that the Drell-Yan analysis above refers to the continuum production of lepton-antilepton pairs, and that any events where the lepton pair originates from a heavy meson resonance should be subtracted out before comparing theory and experiment. We now consider lepton pair production via a resonance. In fact, we have already studied this question in Section 5.3.1 in connection with the production and detection of and in pp collisions, but we then neglected all details of the parton model. [Pg.440]

The experimental signatures of a phase transition include (a) suppression of production of the heavy vector mesons J/XV and E and the upsilon states, (b) the creation of a large number of ss quark-antiquark pairs, and (c) the momentum spectra, abundance, and direction of emission of di-lepton pairs. The first phase experiments in this held have been carried out. Energy densities of 2 GeV/fm3 were created. Strong J/XV suppression has been observed relative to p-A collisions along with an increase in strangeness production. [Pg.293]

The direct calculation of the pair-production process is mandatory. It turns out that an exact calculation of the pair-creation process is not possible because diagrams including higher-order interactions of the lepton pair with both ions cannot be entirely evaluated in closed form. One obvious reason for this is the fact that it has not yet been feasible to account for all possible classes of diagram. [Pg.25]

In attempting a quantitative comparison with experiment, there is another point to note. The model describes what is often referred to as the continuum production of lepton pairs, i.e. lepton pairs which are not the... [Pg.436]

In the above treatment we have neglected the parton momenta k and K so that our lepton pair is produced with = 0. In fact experiments indicate a surprisingly large value for (gx) in the production of pairs with a given mass, as shown in Table 17.3. [Pg.439]


See other pages where Lepton pair production is mentioned: [Pg.2]    [Pg.27]    [Pg.2]    [Pg.27]    [Pg.15]    [Pg.25]    [Pg.26]    [Pg.27]    [Pg.26]   
See also in sourсe #XX -- [ Pg.15 ]




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