Possible effects of weakly coupled neutral currents in pp $Yields$ l$sup +$l$sup -$ + X Page: 3 of 19
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
where Q = p++ p_ is the three-momentum transfer to the lepton pair.
Thus the effects depend on the virtual photon not being produced at
rest. (This is of course also true for the energy asyrmetry which
vanishes identically for Q = o.) In the parton odels 2) generally
used to describe three processes (Fig. i), Q is parallel to the
beam direction and peaked toward zero. This is one factor which
could suppress observable effects.
The observation of parity violation is really the only
clear signature for the presence of weak interactions, since charge
asymmetries can also arise from the interference of two-photon exchange
with one-photon exchange. The dominant process for two-photon exchange
(Fig. 2) is expected to be comparable with one-photon exchange at
ISABELLE energies . On the other hand, if r. polarizations are
measured, the only evidence for parity violation appears in the non-
vanishing expectation value of a triple momentum product, which ic
odd under time reversal. So the presence of such a term depends on
the presence of strong interaction effects. In an inclusive reaction,
whern we sum over all final hadron states, only strong interactions
in the initial pp state can give rise to parity violating effects
of this type. In the parton model, where strong interactions are
ignored, the effect is identically zero.
This leaves us with charge asymmetries. However, in this
case the parton model works in our favour. Since the inclusive pp
cross-section is just an incoherent sum (weighted with probability
distributions) over 3r0ss-sections for qq - there is no
Here’s what’s next.
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Gaillard, M.K. Possible effects of weakly coupled neutral currents in pp $Yields$ l$sup +$l$sup -$ + X, report, June 1, 1972; United States. (https://digital.library.unt.edu/ark:/67531/metadc1030529/m1/3/: accessed April 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.